I2c #28

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@swarren
Contributor
swarren commented May 22, 2012

This is a driver for the BCM2708's HW I2C controller

swarren added some commits May 22, 2012
@swarren swarren i2c: bcm2708: initial driver
I2C driver for the BCM2708 series, as used on the Raspberry Pi.

This driver supports 7-bit addressing, but not 10-bit. The HW supports
10-bit.

This driver does not support repeated starts. It's not clear from the
data sheet how to create repeated starts.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
9fd4298
@swarren swarren HACK: ARM: bcm2708: mux I2C0 onto GPIO0/1
Set up the GPIO/pinmux so that I2C0 is mux'd onto GPIOs 0/1, so that
the controller can actually communicate with the outside world.

Ideally, this would be set up using pinctrl, but that doesn't exist
in this old kernel.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
a61933c
@swarren swarren ARM: bcm2708: instantiate I2C0 device
The BCM2708 has 3 I2C adapters. This change instantiates the first of
these, which is attached to the expansion header on the Raspberry Pi.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
dbf3ef5
@bootc
Contributor
bootc commented May 22, 2012

Hah, I knew this would happen :-( I also have an I2C driver in https://github.com/bootc/linux/tree/rpi-i2cspi

@swarren
Contributor
swarren commented May 23, 2012

Hmm. I like some things better from each driver. I can update my version to incorporate the good parts from your branch, and either issue a new pull request or replace this one, depending on whether I get done before this gets pulled in or not.

BTW, is anyone planning on pushing bcm2708 core support into the mainline kernel? I was tempted to start working on that myself unless someone is already doing it.

@bootc
Contributor
bootc commented May 23, 2012

As I already 'publish' my kernel (http://www.bootc.net/) I'd really appreciate it if you could either comment on what you'd like to see different in my code or send over patches / pull requests. I'd be perfectly happy for our drivers to end up looking identical with bits from yours and bits from mine.

And as for the second question - yes, there is an effort to get the arch/mach code into mainline. Simon Arlott is currently leading this effort (lp0 here on GitHub) and there's a small group of us working on it. Sadly we mostly had to wipe the slate clean and start again for this as there are requirements to use device tree, etc...

You may want to take a look at https://github.com/lp0/linux/tree/rpi-linear

I should mention I'm currently working on forward-porting my SPI driver into that branch, doing the device tree conversion as well as updating it for queued submission as required by the new SPI core.

HTH,
Chris

@swarren
Contributor
swarren commented May 23, 2012

Sure, I'll take a look at that.

@popcornmix
Collaborator

Thanks swarren, but I'll close this pull request, as lp0/bootc are working on what I hope will be the upstreamable kernel we use in the future. Please send any pull requests to bootc.

If there's demand for bootc's I2C/SPI drivers to be merged into this kernel in the interim, then that's a option.

@popcornmix popcornmix closed this May 26, 2012
@bootc
Contributor
bootc commented May 26, 2012

Let me know if you want the SPI/I2C drivers and I can get them cleaned up and tested against the 3.1.9 kernel.

@popcornmix
Collaborator

Yes, that would be great.

@andatche andatche pushed a commit to andatche/raspi-linux that referenced this pull request May 29, 2012
Sarah Sharp usbfs: Fix oops related to user namespace conversion.
commit 1b41c83 upstream.

When running the Point Grey "flycap" program for their USB 3.0 camera
(which was running as a USB 2.0 device for some reason), I trigger this
oops whenever I try to open a video stream:

Dec 15 16:48:34 puck kernel: [ 1798.715559] BUG: unable to handle kernel NULL pointer dereference at           (null)
Dec 15 16:48:34 puck kernel: [ 1798.719153] IP: [<ffffffff8147841e>] free_async+0x1e/0x70
Dec 15 16:48:34 puck kernel: [ 1798.720991] PGD 6f833067 PUD 6fc56067 PMD 0
Dec 15 16:48:34 puck kernel: [ 1798.722815] Oops: 0002 [#1] SMP
Dec 15 16:48:34 puck kernel: [ 1798.724627] CPU 0
Dec 15 16:48:34 puck kernel: [ 1798.724636] Modules linked in: ecryptfs encrypted_keys sha1_generic trusted binfmt_misc sha256_generic aesni_intel cryptd aes_x86_64 aes_generic parport_pc dm_crypt ppdev joydev snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwlwifi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm thinkpad_acpi mac80211 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer btusb uvcvideo snd_seq_device bluetooth videodev psmouse snd v4l2_compat_ioctl32 serio_raw tpm_tis cfg80211 tpm tpm_bios nvram soundcore snd_page_alloc lp parport i915 xhci_hcd ahci libahci drm_kms_helper drm sdhci_pci sdhci e1000e i2c_algo_bit video
Dec 15 16:48:34 puck kernel: [ 1798.734212]
Dec 15 16:48:34 puck kernel: [ 1798.736162] Pid: 2713, comm: FlyCap2 Not tainted 3.2.0-rc5+ #28 LENOVO 4286CTO/4286CTO
Dec 15 16:48:34 puck kernel: [ 1798.738148] RIP: 0010:[<ffffffff8147841e>]  [<ffffffff8147841e>] free_async+0x1e/0x70
Dec 15 16:48:34 puck kernel: [ 1798.740134] RSP: 0018:ffff88005715fd78  EFLAGS: 00010296
Dec 15 16:48:34 puck kernel: [ 1798.742118] RAX: 00000000fffffff4 RBX: ffff88006fe8f900 RCX: 0000000000004118
Dec 15 16:48:34 puck kernel: [ 1798.744116] RDX: 0000000001000000 RSI: 0000000000016390 RDI: 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.746087] RBP: ffff88005715fd88 R08: 0000000000000000 R09: ffffffff8146f22e
Dec 15 16:48:34 puck kernel: [ 1798.748018] R10: ffff88006e520ac0 R11: 0000000000000001 R12: ffff88005715fe28
Dec 15 16:48:34 puck kernel: [ 1798.749916] R13: ffff88005d31df00 R14: ffff88006fe8f900 R15: 00007f688c995cb8
Dec 15 16:48:34 puck kernel: [ 1798.751785] FS:  00007f68a366da40(0000) GS:ffff880100200000(0000) knlGS:0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.753659] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Dec 15 16:48:34 puck kernel: [ 1798.755509] CR2: 0000000000000000 CR3: 00000000706bb000 CR4: 00000000000406f0
Dec 15 16:48:34 puck kernel: [ 1798.757334] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.759124] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Dec 15 16:48:34 puck kernel: [ 1798.760871] Process FlyCap2 (pid: 2713, threadinfo ffff88005715e000, task ffff88006c675b80)
Dec 15 16:48:34 puck kernel: [ 1798.762605] Stack:
Dec 15 16:48:34 puck kernel: [ 1798.764297]  ffff88005715fe28 0000000000000000 ffff88005715fe08 ffffffff81479058
Dec 15 16:48:34 puck kernel: [ 1798.766020]  0000000000000000 ffffea0000004000 ffff880000004118 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.767750]  ffff880000000001 ffff88006e520ac0 fffffff46fd81180 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.769472] Call Trace:
Dec 15 16:48:34 puck kernel: [ 1798.771147]  [<ffffffff81479058>] proc_do_submiturb+0x778/0xa00
Dec 15 16:48:34 puck kernel: [ 1798.772798]  [<ffffffff8147a5fd>] usbdev_do_ioctl+0x24d/0x1200
Dec 15 16:48:34 puck kernel: [ 1798.774410]  [<ffffffff8147b5de>] usbdev_ioctl+0xe/0x20
Dec 15 16:48:34 puck kernel: [ 1798.775975]  [<ffffffff81189259>] do_vfs_ioctl+0x99/0x600
Dec 15 16:48:34 puck kernel: [ 1798.777534]  [<ffffffff81189851>] sys_ioctl+0x91/0xa0
Dec 15 16:48:34 puck kernel: [ 1798.779088]  [<ffffffff816247c2>] system_call_fastpath+0x16/0x1b
ec 15 16:48:34 puck kernel: [ 1798.780634] Code: 51 ff ff ff e9 29 ff ff ff 0f 1f 40 00 55 48 89 e5 53 48 83 ec 08 66 66 66 66 90 48 89 fb 48 8b 7f 18 e8 a6 ea c0 ff 4
8 8b 7b 20 <f0> ff 0f 0f 94 c0 84 c0 74 05 e8 d3 99 c1 ff 48 8b 43 40 48 8b
Dec 15 16:48:34 puck kernel: [ 1798.783970] RIP  [<ffffffff8147841e>] free_async+0x1e/0x70
Dec 15 16:48:34 puck kernel: [ 1798.785630]  RSP <ffff88005715fd78>
Dec 15 16:48:34 puck kernel: [ 1798.787274] CR2: 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.794728] ---[ end trace 52894d3355f88d19 ]---

markup_oops.pl says the oops is in put_cred:

 ffffffff81478401:      48 89 e5                mov    %rsp,%rbp
 ffffffff81478404:      53                      push   %rbx
 ffffffff81478405:      48 83 ec 08             sub    $0x8,%rsp
 ffffffff81478409:      e8 f2 c0 1a 00          callq  ffffffff81624500 <mcount>
 ffffffff8147840e:      48 89 fb                mov    %rdi,%rbx   |  %ebx => ffff88006fe8f900
        put_pid(as->pid);
 ffffffff81478411:      48 8b 7f 18             mov    0x18(%rdi),%rdi
 ffffffff81478415:      e8 a6 ea c0 ff          callq  ffffffff81086ec0 <put_pid>
        put_cred(as->cred);
 ffffffff8147841a:      48 8b 7b 20             mov    0x20(%rbx),%rdi |  %edi => 0  %ebx = ffff88006fe8f900
  */
 static inline int atomic_dec_and_test(atomic_t *v)
 {
        unsigned char c;

        asm volatile(LOCK_PREFIX "decl %0; sete %1"
*ffffffff8147841e:      f0 ff 0f                lock decl (%rdi)   |  %edi = 0 <--- faulting instruction
 ffffffff81478421:      0f 94 c0                sete   %al
 static inline void put_cred(const struct cred *_cred)
 {
        struct cred *cred = (struct cred *) _cred;

        validate_creds(cred);
        if (atomic_dec_and_test(&(cred)->usage))
 ffffffff81478424:      84 c0                   test   %al,%al
 ffffffff81478426:      74 05                   je     ffffffff8147842d <free_async+0x2d>
                __put_cred(cred);
 ffffffff81478428:      e8 d3 99 c1 ff          callq  ffffffff81091e00 <__put_cred>
        kfree(as->urb->transfer_buffer);
 ffffffff8147842d:      48 8b 43 40             mov    0x40(%rbx),%rax
 ffffffff81478431:      48 8b 78 68             mov    0x68(%rax),%rdi
 ffffffff81478435:      e8 a6 e1 ce ff          callq  ffffffff811665e0 <kfree>
        kfree(as->urb->setup_packet);
 ffffffff8147843a:      48 8b 43 40             mov    0x40(%rbx),%rax
 ffffffff8147843e:      48 8b b8 90 00 00 00    mov    0x90(%rax),%rdi
 ffffffff81478445:      e8 96 e1 ce ff          callq  ffffffff811665e0 <kfree>
        usb_free_urb(as->urb);
 ffffffff8147844a:      48 8b 7b 40             mov    0x40(%rbx),%rdi
 ffffffff8147844e:      e8 0d 6b ff ff          callq  ffffffff8146ef60 <usb_free_urb>

This bug seems to have been introduced by commit
d178bc3 "user namespace: usb: make usb
urbs user namespace aware (v2)"

I'm not sure if this is right fix, but it does stop the oops.

Unfortunately, the Point Grey software still refuses to work, but it's a
closed source app, so I can't fix it.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
7f35a69
@andatche andatche pushed a commit to andatche/raspi-linux that referenced this pull request May 29, 2012
@nandra nandra staging: iio: hmc5843: Fix crash in probe function.
commit 62d2feb upstream.

Fix crash after issuing:
	echo hmc5843 0x1e > /sys/class/i2c-dev/i2c-2/device/new_device

	[   37.180999] device: '2-001e': device_add
	[   37.188293] bus: 'i2c': add device 2-001e
	[   37.194549] PM: Adding info for i2c:2-001e
	[   37.200958] bus: 'i2c': driver_probe_device: matched device 2-001e with driver hmc5843
	[   37.210815] bus: 'i2c': really_probe: probing driver hmc5843 with device 2-001e
	[   37.224884] HMC5843 initialized
	[   37.228759] ------------[ cut here ]------------
	[   37.233612] kernel BUG at mm/slab.c:505!
	[   37.237701] Internal error: Oops - BUG: 0 [#1] PREEMPT
	[   37.243103] Modules linked in:
	[   37.246337] CPU: 0    Not tainted  (3.3.1-gta04+ #28)
	[   37.251647] PC is at kfree+0x84/0x144
	[   37.255493] LR is at kfree+0x20/0x144
	[   37.259338] pc : [<c00b408c>]    lr : [<c00b4028>]    psr: 40000093
	[   37.259368] sp : de249cd8  ip : 0000000c  fp : 00000090
	[   37.271362] r10: 0000000a  r9 : de229eac  r8 : c0236274
	[   37.276855] r7 : c09d6490  r6 : a0000013  r5 : de229c00  r4 : de229c10
	[   37.283691] r3 : c0f00218  r2 : 00000400  r1 : c0eea000  r0 : c00b4028
	[   37.290527] Flags: nZcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
	[   37.298095] Control: 10c5387d  Table: 9e1d0019  DAC: 00000015
	[   37.304107] Process sh (pid: 91, stack limit = 0xde2482f0)
	[   37.309844] Stack: (0xde249cd8 to 0xde24a000)
	[   37.314422] 9cc0:                                                       de229c10 de229c00
	[   37.322998] 9ce0: de229c10 ffffffea 00000005 c0236274 de140a80 c00b4798 dec00080 de140a80
	[   37.331573] 9d00: c032f37c dec00080 000080d0 00000001 de229c00 de229c10 c048d578 00000005
	[   37.340148] 9d20: de229eac 0000000a 00000090 c032fa40 00000001 00000000 00000001 de229c10
	[   37.348724] 9d40: de229eac 00000029 c075b558 00000001 00000003 00000004 de229c10 c048d594
	[   37.357299] 9d60: 00000000 60000013 00000018 205b0007 37332020 3432322e 5d343838 c0060020
	[   37.365905] 9d80: de251600 00000001 00000000 de251600 00000001 c0065a84 de229c00 de229c48
	[   37.374481] 9da0: 00000006 0048d62c de229c38 de229c00 de229c00 de1f6c00 de1f6c20 00000001
	[   37.383056] 9dc0: 00000000 c048d62c 00000000 de229c00 de229c00 de1f6c00 de1f6c20 00000001
	[   37.391632] 9de0: 00000000 c048d62c 00000000 c0330164 00000000 de1f6c20 c048d62c de1f6c00
	[   37.400207] 9e00: c0330078 de1f6c04 c078d714 de189b58 00000000 c02ccfd8 de1f6c20 c0795f40
	[   37.408782] 9e20: c0238330 00000000 00000000 c02381a8 de1b9fc0 de1f6c20 de1f6c20 de249e48
	[   37.417358] 9e40: c0238330 c0236bb0 decdbed8 de7d0f14 de1f6c20 de1f6c20 de1f6c54 de1f6c20
	[   37.425933] 9e60: 00000000 c0238030 de1f6c20 c078d7bc de1f6c20 c02377ec de1f6c20 de1f6c28
	[   37.434509] 9e80: dee64cb0 c0236138 c047c554 de189b58 00000000 c004b45c de1f6c20 de1f6cd8
	[   37.443084] 9ea0: c0edfa6c de1f6c00 dee64c68 de1f6c04 de1f6c20 dee64cb8 c047c554 de189b58
	[   37.451690] 9ec0: 00000000 c02cd634 dee64c68 de249ef4 de23b008 dee64cb0 0000000d de23b000
	[   37.460266] 9ee0: de23b007 c02cd78c 00000002 00000000 00000000 35636d68 00333438 00000000
	[   37.468841] 9f00: 00000000 00000000 001e0000 00000000 00000000 00000000 00000000 0a10cec0
	[   37.477416] 9f20: 00000002 de249f80 0000000d dee62990 de189b40 c0234d88 0000000d c010c354
	[   37.485992] 9f40: 0000000d de210f28 000acc88 de249f80 0000000d de248000 00000000 c00b7bf8
	[   37.494567] 9f60: de210f28 000acc88 de210f28 000acc88 00000000 00000000 0000000d c00b7ed8
	[   37.503143] 9f80: 00000000 00000000 0000000d 00000000 0007fa28 0000000d 000acc88 00000004
	[   37.511718] 9fa0: c000e544 c000e380 0007fa28 0000000d 00000001 000acc88 0000000d 00000000
	[   37.520294] 9fc0: 0007fa28 0000000d 000acc88 00000004 00000001 00000020 00000002 00000000
	[   37.528869] 9fe0: 00000000 beab8624 0000ea05 b6eaebac 600d0010 00000001 00000000 00000000
	[   37.537475] [<c00b408c>] (kfree+0x84/0x144) from [<c0236274>] (device_add+0x530/0x57c)
	[   37.545806] [<c0236274>] (device_add+0x530/0x57c) from [<c032fa40>] (iio_device_register+0x8c8/0x990)
	[   37.555480] [<c032fa40>] (iio_device_register+0x8c8/0x990) from [<c0330164>] (hmc5843_probe+0xec/0x114)
	[   37.565338] [<c0330164>] (hmc5843_probe+0xec/0x114) from [<c02ccfd8>] (i2c_device_probe+0xc4/0xf8)
	[   37.574737] [<c02ccfd8>] (i2c_device_probe+0xc4/0xf8) from [<c02381a8>] (driver_probe_device+0x118/0x218)
	[   37.584777] [<c02381a8>] (driver_probe_device+0x118/0x218) from [<c0236bb0>] (bus_for_each_drv+0x4c/0x84)
	[   37.594818] [<c0236bb0>] (bus_for_each_drv+0x4c/0x84) from [<c0238030>] (device_attach+0x78/0xa4)
	[   37.604125] [<c0238030>] (device_attach+0x78/0xa4) from [<c02377ec>] (bus_probe_device+0x28/0x9c)
	[   37.613433] [<c02377ec>] (bus_probe_device+0x28/0x9c) from [<c0236138>] (device_add+0x3f4/0x57c)
	[   37.622650] [<c0236138>] (device_add+0x3f4/0x57c) from [<c02cd634>] (i2c_new_device+0xf8/0x19c)
	[   37.631805] [<c02cd634>] (i2c_new_device+0xf8/0x19c) from [<c02cd78c>] (i2c_sysfs_new_device+0xb4/0x130)
	[   37.641754] [<c02cd78c>] (i2c_sysfs_new_device+0xb4/0x130) from [<c0234d88>] (dev_attr_store+0x18/0x24)
	[   37.651611] [<c0234d88>] (dev_attr_store+0x18/0x24) from [<c010c354>] (sysfs_write_file+0x10c/0x140)
	[   37.661193] [<c010c354>] (sysfs_write_file+0x10c/0x140) from [<c00b7bf8>] (vfs_write+0xb0/0x178)
	[   37.670410] [<c00b7bf8>] (vfs_write+0xb0/0x178) from [<c00b7ed8>] (sys_write+0x3c/0x68)
	[   37.678833] [<c00b7ed8>] (sys_write+0x3c/0x68) from [<c000e380>] (ret_fast_syscall+0x0/0x3c)
	[   37.687683] Code: 1593301c e5932000 e3120080 1a000000 (e7f001f2)
	[   37.700775] ---[ end trace aaf805debdb69390 ]---

Client data was assigned to iio_dev structure in probe but in
hmc5843_init_client function casted to private driver data structure which
is wrong. Possibly calling mutex_init(&data->lock); corrupt data
which the lead to above crash.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
c48fca4
@andatche andatche pushed a commit to andatche/raspi-linux that referenced this pull request May 29, 2012
Sarah Sharp usbfs: Fix oops related to user namespace conversion.
When running the Point Grey "flycap" program for their USB 3.0 camera
(which was running as a USB 2.0 device for some reason), I trigger this
oops whenever I try to open a video stream:

Dec 15 16:48:34 puck kernel: [ 1798.715559] BUG: unable to handle kernel NULL pointer dereference at           (null)
Dec 15 16:48:34 puck kernel: [ 1798.719153] IP: [<ffffffff8147841e>] free_async+0x1e/0x70
Dec 15 16:48:34 puck kernel: [ 1798.720991] PGD 6f833067 PUD 6fc56067 PMD 0
Dec 15 16:48:34 puck kernel: [ 1798.722815] Oops: 0002 [#1] SMP
Dec 15 16:48:34 puck kernel: [ 1798.724627] CPU 0
Dec 15 16:48:34 puck kernel: [ 1798.724636] Modules linked in: ecryptfs encrypted_keys sha1_generic trusted binfmt_misc sha256_generic aesni_intel cryptd aes_x86_64 aes_generic parport_pc dm_crypt ppdev joydev snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iwlwifi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm thinkpad_acpi mac80211 snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer btusb uvcvideo snd_seq_device bluetooth videodev psmouse snd v4l2_compat_ioctl32 serio_raw tpm_tis cfg80211 tpm tpm_bios nvram soundcore snd_page_alloc lp parport i915 xhci_hcd ahci libahci drm_kms_helper drm sdhci_pci sdhci e1000e i2c_algo_bit video
Dec 15 16:48:34 puck kernel: [ 1798.734212]
Dec 15 16:48:34 puck kernel: [ 1798.736162] Pid: 2713, comm: FlyCap2 Not tainted 3.2.0-rc5+ #28 LENOVO 4286CTO/4286CTO
Dec 15 16:48:34 puck kernel: [ 1798.738148] RIP: 0010:[<ffffffff8147841e>]  [<ffffffff8147841e>] free_async+0x1e/0x70
Dec 15 16:48:34 puck kernel: [ 1798.740134] RSP: 0018:ffff88005715fd78  EFLAGS: 00010296
Dec 15 16:48:34 puck kernel: [ 1798.742118] RAX: 00000000fffffff4 RBX: ffff88006fe8f900 RCX: 0000000000004118
Dec 15 16:48:34 puck kernel: [ 1798.744116] RDX: 0000000001000000 RSI: 0000000000016390 RDI: 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.746087] RBP: ffff88005715fd88 R08: 0000000000000000 R09: ffffffff8146f22e
Dec 15 16:48:34 puck kernel: [ 1798.748018] R10: ffff88006e520ac0 R11: 0000000000000001 R12: ffff88005715fe28
Dec 15 16:48:34 puck kernel: [ 1798.749916] R13: ffff88005d31df00 R14: ffff88006fe8f900 R15: 00007f688c995cb8
Dec 15 16:48:34 puck kernel: [ 1798.751785] FS:  00007f68a366da40(0000) GS:ffff880100200000(0000) knlGS:0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.753659] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Dec 15 16:48:34 puck kernel: [ 1798.755509] CR2: 0000000000000000 CR3: 00000000706bb000 CR4: 00000000000406f0
Dec 15 16:48:34 puck kernel: [ 1798.757334] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.759124] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Dec 15 16:48:34 puck kernel: [ 1798.760871] Process FlyCap2 (pid: 2713, threadinfo ffff88005715e000, task ffff88006c675b80)
Dec 15 16:48:34 puck kernel: [ 1798.762605] Stack:
Dec 15 16:48:34 puck kernel: [ 1798.764297]  ffff88005715fe28 0000000000000000 ffff88005715fe08 ffffffff81479058
Dec 15 16:48:34 puck kernel: [ 1798.766020]  0000000000000000 ffffea0000004000 ffff880000004118 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.767750]  ffff880000000001 ffff88006e520ac0 fffffff46fd81180 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.769472] Call Trace:
Dec 15 16:48:34 puck kernel: [ 1798.771147]  [<ffffffff81479058>] proc_do_submiturb+0x778/0xa00
Dec 15 16:48:34 puck kernel: [ 1798.772798]  [<ffffffff8147a5fd>] usbdev_do_ioctl+0x24d/0x1200
Dec 15 16:48:34 puck kernel: [ 1798.774410]  [<ffffffff8147b5de>] usbdev_ioctl+0xe/0x20
Dec 15 16:48:34 puck kernel: [ 1798.775975]  [<ffffffff81189259>] do_vfs_ioctl+0x99/0x600
Dec 15 16:48:34 puck kernel: [ 1798.777534]  [<ffffffff81189851>] sys_ioctl+0x91/0xa0
Dec 15 16:48:34 puck kernel: [ 1798.779088]  [<ffffffff816247c2>] system_call_fastpath+0x16/0x1b
ec 15 16:48:34 puck kernel: [ 1798.780634] Code: 51 ff ff ff e9 29 ff ff ff 0f 1f 40 00 55 48 89 e5 53 48 83 ec 08 66 66 66 66 90 48 89 fb 48 8b 7f 18 e8 a6 ea c0 ff 4
8 8b 7b 20 <f0> ff 0f 0f 94 c0 84 c0 74 05 e8 d3 99 c1 ff 48 8b 43 40 48 8b
Dec 15 16:48:34 puck kernel: [ 1798.783970] RIP  [<ffffffff8147841e>] free_async+0x1e/0x70
Dec 15 16:48:34 puck kernel: [ 1798.785630]  RSP <ffff88005715fd78>
Dec 15 16:48:34 puck kernel: [ 1798.787274] CR2: 0000000000000000
Dec 15 16:48:34 puck kernel: [ 1798.794728] ---[ end trace 52894d3355f88d19 ]---

markup_oops.pl says the oops is in put_cred:

 ffffffff81478401:      48 89 e5                mov    %rsp,%rbp
 ffffffff81478404:      53                      push   %rbx
 ffffffff81478405:      48 83 ec 08             sub    $0x8,%rsp
 ffffffff81478409:      e8 f2 c0 1a 00          callq  ffffffff81624500 <mcount>
 ffffffff8147840e:      48 89 fb                mov    %rdi,%rbx   |  %ebx => ffff88006fe8f900
        put_pid(as->pid);
 ffffffff81478411:      48 8b 7f 18             mov    0x18(%rdi),%rdi
 ffffffff81478415:      e8 a6 ea c0 ff          callq  ffffffff81086ec0 <put_pid>
        put_cred(as->cred);
 ffffffff8147841a:      48 8b 7b 20             mov    0x20(%rbx),%rdi |  %edi => 0  %ebx = ffff88006fe8f900
  */
 static inline int atomic_dec_and_test(atomic_t *v)
 {
        unsigned char c;

        asm volatile(LOCK_PREFIX "decl %0; sete %1"
*ffffffff8147841e:      f0 ff 0f                lock decl (%rdi)   |  %edi = 0 <--- faulting instruction
 ffffffff81478421:      0f 94 c0                sete   %al
 static inline void put_cred(const struct cred *_cred)
 {
        struct cred *cred = (struct cred *) _cred;

        validate_creds(cred);
        if (atomic_dec_and_test(&(cred)->usage))
 ffffffff81478424:      84 c0                   test   %al,%al
 ffffffff81478426:      74 05                   je     ffffffff8147842d <free_async+0x2d>
                __put_cred(cred);
 ffffffff81478428:      e8 d3 99 c1 ff          callq  ffffffff81091e00 <__put_cred>
        kfree(as->urb->transfer_buffer);
 ffffffff8147842d:      48 8b 43 40             mov    0x40(%rbx),%rax
 ffffffff81478431:      48 8b 78 68             mov    0x68(%rax),%rdi
 ffffffff81478435:      e8 a6 e1 ce ff          callq  ffffffff811665e0 <kfree>
        kfree(as->urb->setup_packet);
 ffffffff8147843a:      48 8b 43 40             mov    0x40(%rbx),%rax
 ffffffff8147843e:      48 8b b8 90 00 00 00    mov    0x90(%rax),%rdi
 ffffffff81478445:      e8 96 e1 ce ff          callq  ffffffff811665e0 <kfree>
        usb_free_urb(as->urb);
 ffffffff8147844a:      48 8b 7b 40             mov    0x40(%rbx),%rdi
 ffffffff8147844e:      e8 0d 6b ff ff          callq  ffffffff8146ef60 <usb_free_urb>

This bug seems to have been introduced by commit
d178bc3 "user namespace: usb: make usb
urbs user namespace aware (v2)"

I'm not sure if this is right fix, but it does stop the oops.

Unfortunately, the Point Grey software still refuses to work, but it's a
closed source app, so I can't fix it.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1b41c83
@andatche andatche pushed a commit to andatche/raspi-linux that referenced this pull request May 29, 2012
@nandra nandra staging: iio: hmc5843: Fix crash in probe function.
commit 62d2feb upstream.

Fix crash after issuing:
	echo hmc5843 0x1e > /sys/class/i2c-dev/i2c-2/device/new_device

	[   37.180999] device: '2-001e': device_add
	[   37.188293] bus: 'i2c': add device 2-001e
	[   37.194549] PM: Adding info for i2c:2-001e
	[   37.200958] bus: 'i2c': driver_probe_device: matched device 2-001e with driver hmc5843
	[   37.210815] bus: 'i2c': really_probe: probing driver hmc5843 with device 2-001e
	[   37.224884] HMC5843 initialized
	[   37.228759] ------------[ cut here ]------------
	[   37.233612] kernel BUG at mm/slab.c:505!
	[   37.237701] Internal error: Oops - BUG: 0 [#1] PREEMPT
	[   37.243103] Modules linked in:
	[   37.246337] CPU: 0    Not tainted  (3.3.1-gta04+ #28)
	[   37.251647] PC is at kfree+0x84/0x144
	[   37.255493] LR is at kfree+0x20/0x144
	[   37.259338] pc : [<c00b408c>]    lr : [<c00b4028>]    psr: 40000093
	[   37.259368] sp : de249cd8  ip : 0000000c  fp : 00000090
	[   37.271362] r10: 0000000a  r9 : de229eac  r8 : c0236274
	[   37.276855] r7 : c09d6490  r6 : a0000013  r5 : de229c00  r4 : de229c10
	[   37.283691] r3 : c0f00218  r2 : 00000400  r1 : c0eea000  r0 : c00b4028
	[   37.290527] Flags: nZcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
	[   37.298095] Control: 10c5387d  Table: 9e1d0019  DAC: 00000015
	[   37.304107] Process sh (pid: 91, stack limit = 0xde2482f0)
	[   37.309844] Stack: (0xde249cd8 to 0xde24a000)
	[   37.314422] 9cc0:                                                       de229c10 de229c00
	[   37.322998] 9ce0: de229c10 ffffffea 00000005 c0236274 de140a80 c00b4798 dec00080 de140a80
	[   37.331573] 9d00: c032f37c dec00080 000080d0 00000001 de229c00 de229c10 c048d578 00000005
	[   37.340148] 9d20: de229eac 0000000a 00000090 c032fa40 00000001 00000000 00000001 de229c10
	[   37.348724] 9d40: de229eac 00000029 c075b558 00000001 00000003 00000004 de229c10 c048d594
	[   37.357299] 9d60: 00000000 60000013 00000018 205b0007 37332020 3432322e 5d343838 c0060020
	[   37.365905] 9d80: de251600 00000001 00000000 de251600 00000001 c0065a84 de229c00 de229c48
	[   37.374481] 9da0: 00000006 0048d62c de229c38 de229c00 de229c00 de1f6c00 de1f6c20 00000001
	[   37.383056] 9dc0: 00000000 c048d62c 00000000 de229c00 de229c00 de1f6c00 de1f6c20 00000001
	[   37.391632] 9de0: 00000000 c048d62c 00000000 c0330164 00000000 de1f6c20 c048d62c de1f6c00
	[   37.400207] 9e00: c0330078 de1f6c04 c078d714 de189b58 00000000 c02ccfd8 de1f6c20 c0795f40
	[   37.408782] 9e20: c0238330 00000000 00000000 c02381a8 de1b9fc0 de1f6c20 de1f6c20 de249e48
	[   37.417358] 9e40: c0238330 c0236bb0 decdbed8 de7d0f14 de1f6c20 de1f6c20 de1f6c54 de1f6c20
	[   37.425933] 9e60: 00000000 c0238030 de1f6c20 c078d7bc de1f6c20 c02377ec de1f6c20 de1f6c28
	[   37.434509] 9e80: dee64cb0 c0236138 c047c554 de189b58 00000000 c004b45c de1f6c20 de1f6cd8
	[   37.443084] 9ea0: c0edfa6c de1f6c00 dee64c68 de1f6c04 de1f6c20 dee64cb8 c047c554 de189b58
	[   37.451690] 9ec0: 00000000 c02cd634 dee64c68 de249ef4 de23b008 dee64cb0 0000000d de23b000
	[   37.460266] 9ee0: de23b007 c02cd78c 00000002 00000000 00000000 35636d68 00333438 00000000
	[   37.468841] 9f00: 00000000 00000000 001e0000 00000000 00000000 00000000 00000000 0a10cec0
	[   37.477416] 9f20: 00000002 de249f80 0000000d dee62990 de189b40 c0234d88 0000000d c010c354
	[   37.485992] 9f40: 0000000d de210f28 000acc88 de249f80 0000000d de248000 00000000 c00b7bf8
	[   37.494567] 9f60: de210f28 000acc88 de210f28 000acc88 00000000 00000000 0000000d c00b7ed8
	[   37.503143] 9f80: 00000000 00000000 0000000d 00000000 0007fa28 0000000d 000acc88 00000004
	[   37.511718] 9fa0: c000e544 c000e380 0007fa28 0000000d 00000001 000acc88 0000000d 00000000
	[   37.520294] 9fc0: 0007fa28 0000000d 000acc88 00000004 00000001 00000020 00000002 00000000
	[   37.528869] 9fe0: 00000000 beab8624 0000ea05 b6eaebac 600d0010 00000001 00000000 00000000
	[   37.537475] [<c00b408c>] (kfree+0x84/0x144) from [<c0236274>] (device_add+0x530/0x57c)
	[   37.545806] [<c0236274>] (device_add+0x530/0x57c) from [<c032fa40>] (iio_device_register+0x8c8/0x990)
	[   37.555480] [<c032fa40>] (iio_device_register+0x8c8/0x990) from [<c0330164>] (hmc5843_probe+0xec/0x114)
	[   37.565338] [<c0330164>] (hmc5843_probe+0xec/0x114) from [<c02ccfd8>] (i2c_device_probe+0xc4/0xf8)
	[   37.574737] [<c02ccfd8>] (i2c_device_probe+0xc4/0xf8) from [<c02381a8>] (driver_probe_device+0x118/0x218)
	[   37.584777] [<c02381a8>] (driver_probe_device+0x118/0x218) from [<c0236bb0>] (bus_for_each_drv+0x4c/0x84)
	[   37.594818] [<c0236bb0>] (bus_for_each_drv+0x4c/0x84) from [<c0238030>] (device_attach+0x78/0xa4)
	[   37.604125] [<c0238030>] (device_attach+0x78/0xa4) from [<c02377ec>] (bus_probe_device+0x28/0x9c)
	[   37.613433] [<c02377ec>] (bus_probe_device+0x28/0x9c) from [<c0236138>] (device_add+0x3f4/0x57c)
	[   37.622650] [<c0236138>] (device_add+0x3f4/0x57c) from [<c02cd634>] (i2c_new_device+0xf8/0x19c)
	[   37.631805] [<c02cd634>] (i2c_new_device+0xf8/0x19c) from [<c02cd78c>] (i2c_sysfs_new_device+0xb4/0x130)
	[   37.641754] [<c02cd78c>] (i2c_sysfs_new_device+0xb4/0x130) from [<c0234d88>] (dev_attr_store+0x18/0x24)
	[   37.651611] [<c0234d88>] (dev_attr_store+0x18/0x24) from [<c010c354>] (sysfs_write_file+0x10c/0x140)
	[   37.661193] [<c010c354>] (sysfs_write_file+0x10c/0x140) from [<c00b7bf8>] (vfs_write+0xb0/0x178)
	[   37.670410] [<c00b7bf8>] (vfs_write+0xb0/0x178) from [<c00b7ed8>] (sys_write+0x3c/0x68)
	[   37.678833] [<c00b7ed8>] (sys_write+0x3c/0x68) from [<c000e380>] (ret_fast_syscall+0x0/0x3c)
	[   37.687683] Code: 1593301c e5932000 e3120080 1a000000 (e7f001f2)
	[   37.700775] ---[ end trace aaf805debdb69390 ]---

Client data was assigned to iio_dev structure in probe but in
hmc5843_init_client function casted to private driver data structure which
is wrong. Possibly calling mutex_init(&data->lock); corrupt data
which the lead to above crash.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1b08b14
@erique erique pushed a commit to erique/rpi_linux that referenced this pull request Jul 16, 2012
@rolandd rolandd cxgb3: Don't call cxgb_vlan_mode until q locks are initialized
The driver calls cxgb_vlan_mode() from init_one().  This calls into
synchronize_rx(), which locks all the q locks, but the q locks are not
initialized until cxgb_up() -> setup_sge_qsets().  So move the call to
cxgb_vlan_mode() into cxgb_up(), after the call to setup_sge_qsets().
We also move the body of these functions up higher to avoid having to
a forward declaration.

This was found because of the lockdep warning:

    INFO: trying to register non-static key.
    the code is fine but needs lockdep annotation.
    turning off the locking correctness validator.
    Pid: 323, comm: work_for_cpu Not tainted 3.4.0-rc5 #28
    Call Trace:
     [<ffffffff8106e767>] register_lock_class+0x108/0x2d0
     [<ffffffff8106ff42>] __lock_acquire+0xd3/0xd06
     [<ffffffff81070fd0>] lock_acquire+0xbf/0xfe
     [<ffffffff813862a6>] _raw_spin_lock_irq+0x36/0x45
     [<ffffffffa01e71aa>] cxgb_vlan_mode+0x96/0xcb [cxgb3]
     [<ffffffffa01f90eb>] init_one+0x8c4/0x980 [cxgb3]
     [<ffffffff811fcbf0>] local_pci_probe+0x3f/0x70
     [<ffffffff81042206>] do_work_for_cpu+0x10/0x22
     [<ffffffff810482de>] kthread+0xa1/0xa9
     [<ffffffff8138e234>] kernel_thread_helper+0x4/0x10

Contrary to what lockdep says, the code is not fine: we are locking an
uninitialized spinlock.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
60158e6
@popcornmix popcornmix pushed a commit that referenced this pull request Oct 13, 2012
Luck, Tony x86: Remove some noise from boot log when starting cpus
Printing the "start_ip" for every secondary cpu is very noisy on a large
system - and doesn't add any value. Drop this message.

Console log before:
Booting Node   0, Processors  #1
smpboot cpu 1: start_ip = 96000
 #2
smpboot cpu 2: start_ip = 96000
 #3
smpboot cpu 3: start_ip = 96000
 #4
smpboot cpu 4: start_ip = 96000
       ...
 #31
smpboot cpu 31: start_ip = 96000
Brought up 32 CPUs

Console log after:
Booting Node   0, Processors  #1 #2 #3 #4 #5 #6 #7 Ok.
Booting Node   1, Processors  #8 #9 #10 #11 #12 #13 #14 #15 Ok.
Booting Node   0, Processors  #16 #17 #18 #19 #20 #21 #22 #23 Ok.
Booting Node   1, Processors  #24 #25 #26 #27 #28 #29 #30 #31
Brought up 32 CPUs

Acked-by: Borislav Petkov <bp@amd64.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/4f452eb42507460426@agluck-desktop.sc.intel.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
140f190
@popcornmix popcornmix pushed a commit that referenced this pull request Oct 13, 2012
@nandra nandra staging: iio: hmc5843: Fix crash in probe function.
Fix crash after issuing:
	echo hmc5843 0x1e > /sys/class/i2c-dev/i2c-2/device/new_device

	[   37.180999] device: '2-001e': device_add
	[   37.188293] bus: 'i2c': add device 2-001e
	[   37.194549] PM: Adding info for i2c:2-001e
	[   37.200958] bus: 'i2c': driver_probe_device: matched device 2-001e with driver hmc5843
	[   37.210815] bus: 'i2c': really_probe: probing driver hmc5843 with device 2-001e
	[   37.224884] HMC5843 initialized
	[   37.228759] ------------[ cut here ]------------
	[   37.233612] kernel BUG at mm/slab.c:505!
	[   37.237701] Internal error: Oops - BUG: 0 [#1] PREEMPT
	[   37.243103] Modules linked in:
	[   37.246337] CPU: 0    Not tainted  (3.3.1-gta04+ #28)
	[   37.251647] PC is at kfree+0x84/0x144
	[   37.255493] LR is at kfree+0x20/0x144
	[   37.259338] pc : [<c00b408c>]    lr : [<c00b4028>]    psr: 40000093
	[   37.259368] sp : de249cd8  ip : 0000000c  fp : 00000090
	[   37.271362] r10: 0000000a  r9 : de229eac  r8 : c0236274
	[   37.276855] r7 : c09d6490  r6 : a0000013  r5 : de229c00  r4 : de229c10
	[   37.283691] r3 : c0f00218  r2 : 00000400  r1 : c0eea000  r0 : c00b4028
	[   37.290527] Flags: nZcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
	[   37.298095] Control: 10c5387d  Table: 9e1d0019  DAC: 00000015
	[   37.304107] Process sh (pid: 91, stack limit = 0xde2482f0)
	[   37.309844] Stack: (0xde249cd8 to 0xde24a000)
	[   37.314422] 9cc0:                                                       de229c10 de229c00
	[   37.322998] 9ce0: de229c10 ffffffea 00000005 c0236274 de140a80 c00b4798 dec00080 de140a80
	[   37.331573] 9d00: c032f37c dec00080 000080d0 00000001 de229c00 de229c10 c048d578 00000005
	[   37.340148] 9d20: de229eac 0000000a 00000090 c032fa40 00000001 00000000 00000001 de229c10
	[   37.348724] 9d40: de229eac 00000029 c075b558 00000001 00000003 00000004 de229c10 c048d594
	[   37.357299] 9d60: 00000000 60000013 00000018 205b0007 37332020 3432322e 5d343838 c0060020
	[   37.365905] 9d80: de251600 00000001 00000000 de251600 00000001 c0065a84 de229c00 de229c48
	[   37.374481] 9da0: 00000006 0048d62c de229c38 de229c00 de229c00 de1f6c00 de1f6c20 00000001
	[   37.383056] 9dc0: 00000000 c048d62c 00000000 de229c00 de229c00 de1f6c00 de1f6c20 00000001
	[   37.391632] 9de0: 00000000 c048d62c 00000000 c0330164 00000000 de1f6c20 c048d62c de1f6c00
	[   37.400207] 9e00: c0330078 de1f6c04 c078d714 de189b58 00000000 c02ccfd8 de1f6c20 c0795f40
	[   37.408782] 9e20: c0238330 00000000 00000000 c02381a8 de1b9fc0 de1f6c20 de1f6c20 de249e48
	[   37.417358] 9e40: c0238330 c0236bb0 decdbed8 de7d0f14 de1f6c20 de1f6c20 de1f6c54 de1f6c20
	[   37.425933] 9e60: 00000000 c0238030 de1f6c20 c078d7bc de1f6c20 c02377ec de1f6c20 de1f6c28
	[   37.434509] 9e80: dee64cb0 c0236138 c047c554 de189b58 00000000 c004b45c de1f6c20 de1f6cd8
	[   37.443084] 9ea0: c0edfa6c de1f6c00 dee64c68 de1f6c04 de1f6c20 dee64cb8 c047c554 de189b58
	[   37.451690] 9ec0: 00000000 c02cd634 dee64c68 de249ef4 de23b008 dee64cb0 0000000d de23b000
	[   37.460266] 9ee0: de23b007 c02cd78c 00000002 00000000 00000000 35636d68 00333438 00000000
	[   37.468841] 9f00: 00000000 00000000 001e0000 00000000 00000000 00000000 00000000 0a10cec0
	[   37.477416] 9f20: 00000002 de249f80 0000000d dee62990 de189b40 c0234d88 0000000d c010c354
	[   37.485992] 9f40: 0000000d de210f28 000acc88 de249f80 0000000d de248000 00000000 c00b7bf8
	[   37.494567] 9f60: de210f28 000acc88 de210f28 000acc88 00000000 00000000 0000000d c00b7ed8
	[   37.503143] 9f80: 00000000 00000000 0000000d 00000000 0007fa28 0000000d 000acc88 00000004
	[   37.511718] 9fa0: c000e544 c000e380 0007fa28 0000000d 00000001 000acc88 0000000d 00000000
	[   37.520294] 9fc0: 0007fa28 0000000d 000acc88 00000004 00000001 00000020 00000002 00000000
	[   37.528869] 9fe0: 00000000 beab8624 0000ea05 b6eaebac 600d0010 00000001 00000000 00000000
	[   37.537475] [<c00b408c>] (kfree+0x84/0x144) from [<c0236274>] (device_add+0x530/0x57c)
	[   37.545806] [<c0236274>] (device_add+0x530/0x57c) from [<c032fa40>] (iio_device_register+0x8c8/0x990)
	[   37.555480] [<c032fa40>] (iio_device_register+0x8c8/0x990) from [<c0330164>] (hmc5843_probe+0xec/0x114)
	[   37.565338] [<c0330164>] (hmc5843_probe+0xec/0x114) from [<c02ccfd8>] (i2c_device_probe+0xc4/0xf8)
	[   37.574737] [<c02ccfd8>] (i2c_device_probe+0xc4/0xf8) from [<c02381a8>] (driver_probe_device+0x118/0x218)
	[   37.584777] [<c02381a8>] (driver_probe_device+0x118/0x218) from [<c0236bb0>] (bus_for_each_drv+0x4c/0x84)
	[   37.594818] [<c0236bb0>] (bus_for_each_drv+0x4c/0x84) from [<c0238030>] (device_attach+0x78/0xa4)
	[   37.604125] [<c0238030>] (device_attach+0x78/0xa4) from [<c02377ec>] (bus_probe_device+0x28/0x9c)
	[   37.613433] [<c02377ec>] (bus_probe_device+0x28/0x9c) from [<c0236138>] (device_add+0x3f4/0x57c)
	[   37.622650] [<c0236138>] (device_add+0x3f4/0x57c) from [<c02cd634>] (i2c_new_device+0xf8/0x19c)
	[   37.631805] [<c02cd634>] (i2c_new_device+0xf8/0x19c) from [<c02cd78c>] (i2c_sysfs_new_device+0xb4/0x130)
	[   37.641754] [<c02cd78c>] (i2c_sysfs_new_device+0xb4/0x130) from [<c0234d88>] (dev_attr_store+0x18/0x24)
	[   37.651611] [<c0234d88>] (dev_attr_store+0x18/0x24) from [<c010c354>] (sysfs_write_file+0x10c/0x140)
	[   37.661193] [<c010c354>] (sysfs_write_file+0x10c/0x140) from [<c00b7bf8>] (vfs_write+0xb0/0x178)
	[   37.670410] [<c00b7bf8>] (vfs_write+0xb0/0x178) from [<c00b7ed8>] (sys_write+0x3c/0x68)
	[   37.678833] [<c00b7ed8>] (sys_write+0x3c/0x68) from [<c000e380>] (ret_fast_syscall+0x0/0x3c)
	[   37.687683] Code: 1593301c e5932000 e3120080 1a000000 (e7f001f2)
	[   37.700775] ---[ end trace aaf805debdb69390 ]---

Client data was assigned to iio_dev structure in probe but in
hmc5843_init_client function casted to private driver data structure which
is wrong. Possibly calling mutex_init(&data->lock); corrupt data
which the lead to above crash.

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62d2feb
@popcornmix popcornmix pushed a commit that referenced this pull request Oct 13, 2012
Mohammed Shafi Shajakhan cfg80211: Fix mutex locking in reg_last_request_cell_base
should fix the following issue

	[ 3229.815012] [ BUG: lock held when returning to user space! ]
	[ 3229.815016] 3.5.0-rc7-wl #28 Tainted: G        W  O
	[ 3229.815017]
	------------------------------------------------
	[ 3229.815019] wpa_supplicant/5783 is leaving the kernel with locks still held!
	[ 3229.815022] 1 lock held by wpa_supplicant/5783:
	[ 3229.815023]  #0: (reg_mutex){+.+.+.}, at: [<fa65834d>]
	reg_last_request_cell_base+0x1d/0x60 [cfg80211]

Cc: Luis Rodriguez <mcgrof@gmail.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Tested-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
ebd0fd2
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Apr 4, 2013
Konrad Rzeszutek Wilk xen/acpi-processor: Don't dereference struct acpi_processor on all CPUs.
With git commit c705c78
"acpi: Export the acpi_processor_get_performance_info" we are now
using a different mechanism to access the P-states.

The acpi_processor per-cpu structure is set and filtered by the
core ACPI code which shrinks the per_cpu contents to only online CPUs.
In the past we would call acpi_processor_register_performance()
which would have not tried to dereference offline cpus.

With the new patch and the fact that the loop we take is for
for_all_possible_cpus we end up crashing on some machines.
We could modify the loop to be for online_cpus - but all the other
loops in the code use possible_cpus (for a good reason) - so lets
leave it as so and just check if per_cpu(processor) is NULL.

With this patch we will bypass the !online but possible CPUs.
This fixes:

IP: [<ffffffffa00d13b5>] xen_acpi_processor_init+0x1b6/0xe01 [xen_acpi_processor]
PGD 4126e6067 PUD 4126e3067 PMD 0
Oops: 0002 [#1] SMP
Pid: 432, comm: modprobe Not tainted 3.9.0-rc3+ #28 To be filled by O.E.M. To be filled by O.E.M./M5A97
RIP: e030:[<ffffffffa00d13b5>]  [<ffffffffa00d13b5>] xen_acpi_processor_init+0x1b6/0xe01 [xen_acpi_processor]
RSP: e02b:ffff88040c8a3ce8  EFLAGS: 00010282
.. snip..
Call Trace:
 [<ffffffffa00d11ff>] ? read_acpi_id+0x12b/0x12b [xen_acpi_processor]
 [<ffffffff8100215a>] do_one_initcall+0x12a/0x180
 [<ffffffff810c42c3>] load_module+0x1cd3/0x2870
 [<ffffffff81319b70>] ? ddebug_proc_open+0xc0/0xc0
 [<ffffffff810c4f37>] sys_init_module+0xd7/0x120
 [<ffffffff8166ce19>] system_call_fastpath+0x16/0x1b

on some machines.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
949dd8c
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Sep 10, 2013
@jtlayton jtlayton cifs: ensure that srv_mutex is held when dealing with ssocket pointer
Oleksii reported that he had seen an oops similar to this:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000088
IP: [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
PGD 0
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: ipt_MASQUERADE xt_REDIRECT xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables carl9170 ath usb_storage f2fs nfnetlink_log nfnetlink md4 cifs dns_resolver hid_generic usbhid hid af_packet uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev rfcomm btusb bnep bluetooth qmi_wwan qcserial cdc_wdm usb_wwan usbnet usbserial mii snd_hda_codec_hdmi snd_hda_codec_realtek iwldvm mac80211 coretemp intel_powerclamp kvm_intel kvm iwlwifi snd_hda_intel cfg80211 snd_hda_codec xhci_hcd e1000e ehci_pci snd_hwdep sdhci_pci snd_pcm ehci_hcd microcode psmouse sdhci thinkpad_acpi mmc_core i2c_i801 pcspkr usbcore hwmon snd_timer snd_page_alloc snd ptp rfkill pps_core soundcore evdev usb_common vboxnetflt(O) vboxdrv(O)Oops#2 Part8
 loop tun binfmt_misc fuse msr acpi_call(O) ipv6 autofs4
CPU: 0 PID: 21612 Comm: kworker/0:1 Tainted: G        W  O 3.10.1SIGN #28
Hardware name: LENOVO 2306CTO/2306CTO, BIOS G2ET92WW (2.52 ) 02/22/2013
Workqueue: cifsiod cifs_echo_request [cifs]
task: ffff8801e1f416f0 ti: ffff880148744000 task.ti: ffff880148744000
RIP: 0010:[<ffffffff814dcc13>]  [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
RSP: 0000:ffff880148745b00  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880148745b78 RCX: 0000000000000048
RDX: ffff880148745c90 RSI: ffff880181864a00 RDI: ffff880148745b78
RBP: ffff880148745c48 R08: 0000000000000048 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880181864a00
R13: ffff880148745c90 R14: 0000000000000048 R15: 0000000000000048
FS:  0000000000000000(0000) GS:ffff88021e200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 000000020c42c000 CR4: 00000000001407b0
Oops#2 Part7
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
 ffff880148745b30 ffffffff810c4af9 0000004848745b30 ffff880181864a00
 ffffffff81ffbc40 0000000000000000 ffff880148745c90 ffffffff810a5aab
 ffff880148745bc0 ffffffff81ffbc40 ffff880148745b60 ffffffff815a9fb8
Call Trace:
 [<ffffffff810c4af9>] ? finish_task_switch+0x49/0xe0
 [<ffffffff810a5aab>] ? lock_timer_base.isra.36+0x2b/0x50
 [<ffffffff815a9fb8>] ? _raw_spin_unlock_irqrestore+0x18/0x40
 [<ffffffff810a673f>] ? try_to_del_timer_sync+0x4f/0x70
 [<ffffffff815aa38f>] ? _raw_spin_unlock_bh+0x1f/0x30
 [<ffffffff814dcc87>] kernel_sendmsg+0x37/0x50
 [<ffffffffa081a0e0>] smb_send_kvec+0xd0/0x1d0 [cifs]
 [<ffffffffa081a263>] smb_send_rqst+0x83/0x1f0 [cifs]
 [<ffffffffa081ab6c>] cifs_call_async+0xec/0x1b0 [cifs]
 [<ffffffffa08245e0>] ? free_rsp_buf+0x40/0x40 [cifs]
Oops#2 Part6
 [<ffffffffa082606e>] SMB2_echo+0x8e/0xb0 [cifs]
 [<ffffffffa0808789>] cifs_echo_request+0x79/0xa0 [cifs]
 [<ffffffff810b45b3>] process_one_work+0x173/0x4a0
 [<ffffffff810b52a1>] worker_thread+0x121/0x3a0
 [<ffffffff810b5180>] ? manage_workers.isra.27+0x2b0/0x2b0
 [<ffffffff810bae00>] kthread+0xc0/0xd0
 [<ffffffff810bad40>] ? kthread_create_on_node+0x120/0x120
 [<ffffffff815b199c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810bad40>] ? kthread_create_on_node+0x120/0x120
Code: 84 24 b8 00 00 00 4c 89 f1 4c 89 ea 4c 89 e6 48 89 df 4c 89 60 18 48 c7 40 28 00 00 00 00 4c 89 68 30 44 89 70 14 49 8b 44 24 28 <ff> 90 88 00 00 00 3d ef fd ff ff 74 10 48 8d 65 e0 5b 41 5c 41
 RIP  [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
 RSP <ffff880148745b00>
CR2: 0000000000000088

The client was in the middle of trying to send a frame when the
server->ssocket pointer got zeroed out. In most places, that we access
that pointer, the srv_mutex is held. There's only one spot that I see
that the server->ssocket pointer gets set and the srv_mutex isn't held.
This patch corrects that.

The upstream bug report was here:

    https://bugzilla.kernel.org/show_bug.cgi?id=60557

Cc: <stable@vger.kernel.org>
Reported-by: Oleksii Shevchuk <alxchk@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
73e216a
@popcornmix popcornmix pushed a commit that referenced this pull request Sep 29, 2013
@jtlayton jtlayton cifs: ensure that srv_mutex is held when dealing with ssocket pointer
commit 73e216a upstream.

Oleksii reported that he had seen an oops similar to this:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000088
IP: [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
PGD 0
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: ipt_MASQUERADE xt_REDIRECT xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables carl9170 ath usb_storage f2fs nfnetlink_log nfnetlink md4 cifs dns_resolver hid_generic usbhid hid af_packet uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev rfcomm btusb bnep bluetooth qmi_wwan qcserial cdc_wdm usb_wwan usbnet usbserial mii snd_hda_codec_hdmi snd_hda_codec_realtek iwldvm mac80211 coretemp intel_powerclamp kvm_intel kvm iwlwifi snd_hda_intel cfg80211 snd_hda_codec xhci_hcd e1000e ehci_pci snd_hwdep sdhci_pci snd_pcm ehci_hcd microcode psmouse sdhci thinkpad_acpi mmc_core i2c_i801 pcspkr usbcore hwmon snd_timer snd_page_alloc snd ptp rfkill pps_core soundcore evdev usb_common vboxnetflt(O) vboxdrv(O)Oops#2 Part8
 loop tun binfmt_misc fuse msr acpi_call(O) ipv6 autofs4
CPU: 0 PID: 21612 Comm: kworker/0:1 Tainted: G        W  O 3.10.1SIGN #28
Hardware name: LENOVO 2306CTO/2306CTO, BIOS G2ET92WW (2.52 ) 02/22/2013
Workqueue: cifsiod cifs_echo_request [cifs]
task: ffff8801e1f416f0 ti: ffff880148744000 task.ti: ffff880148744000
RIP: 0010:[<ffffffff814dcc13>]  [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
RSP: 0000:ffff880148745b00  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880148745b78 RCX: 0000000000000048
RDX: ffff880148745c90 RSI: ffff880181864a00 RDI: ffff880148745b78
RBP: ffff880148745c48 R08: 0000000000000048 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880181864a00
R13: ffff880148745c90 R14: 0000000000000048 R15: 0000000000000048
FS:  0000000000000000(0000) GS:ffff88021e200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 000000020c42c000 CR4: 00000000001407b0
Oops#2 Part7
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
 ffff880148745b30 ffffffff810c4af9 0000004848745b30 ffff880181864a00
 ffffffff81ffbc40 0000000000000000 ffff880148745c90 ffffffff810a5aab
 ffff880148745bc0 ffffffff81ffbc40 ffff880148745b60 ffffffff815a9fb8
Call Trace:
 [<ffffffff810c4af9>] ? finish_task_switch+0x49/0xe0
 [<ffffffff810a5aab>] ? lock_timer_base.isra.36+0x2b/0x50
 [<ffffffff815a9fb8>] ? _raw_spin_unlock_irqrestore+0x18/0x40
 [<ffffffff810a673f>] ? try_to_del_timer_sync+0x4f/0x70
 [<ffffffff815aa38f>] ? _raw_spin_unlock_bh+0x1f/0x30
 [<ffffffff814dcc87>] kernel_sendmsg+0x37/0x50
 [<ffffffffa081a0e0>] smb_send_kvec+0xd0/0x1d0 [cifs]
 [<ffffffffa081a263>] smb_send_rqst+0x83/0x1f0 [cifs]
 [<ffffffffa081ab6c>] cifs_call_async+0xec/0x1b0 [cifs]
 [<ffffffffa08245e0>] ? free_rsp_buf+0x40/0x40 [cifs]
Oops#2 Part6
 [<ffffffffa082606e>] SMB2_echo+0x8e/0xb0 [cifs]
 [<ffffffffa0808789>] cifs_echo_request+0x79/0xa0 [cifs]
 [<ffffffff810b45b3>] process_one_work+0x173/0x4a0
 [<ffffffff810b52a1>] worker_thread+0x121/0x3a0
 [<ffffffff810b5180>] ? manage_workers.isra.27+0x2b0/0x2b0
 [<ffffffff810bae00>] kthread+0xc0/0xd0
 [<ffffffff810bad40>] ? kthread_create_on_node+0x120/0x120
 [<ffffffff815b199c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810bad40>] ? kthread_create_on_node+0x120/0x120
Code: 84 24 b8 00 00 00 4c 89 f1 4c 89 ea 4c 89 e6 48 89 df 4c 89 60 18 48 c7 40 28 00 00 00 00 4c 89 68 30 44 89 70 14 49 8b 44 24 28 <ff> 90 88 00 00 00 3d ef fd ff ff 74 10 48 8d 65 e0 5b 41 5c 41
 RIP  [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
 RSP <ffff880148745b00>
CR2: 0000000000000088

The client was in the middle of trying to send a frame when the
server->ssocket pointer got zeroed out. In most places, that we access
that pointer, the srv_mutex is held. There's only one spot that I see
that the server->ssocket pointer gets set and the srv_mutex isn't held.
This patch corrects that.

The upstream bug report was here:

    https://bugzilla.kernel.org/show_bug.cgi?id=60557

Reported-by: Oleksii Shevchuk <alxchk@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9b8ace6
@popcornmix popcornmix pushed a commit that referenced this pull request Sep 29, 2013
@jtlayton jtlayton cifs: ensure that srv_mutex is held when dealing with ssocket pointer
commit 73e216a upstream.

Oleksii reported that he had seen an oops similar to this:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000088
IP: [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
PGD 0
Oops: 0000 [#1] PREEMPT SMP
Modules linked in: ipt_MASQUERADE xt_REDIRECT xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables carl9170 ath usb_storage f2fs nfnetlink_log nfnetlink md4 cifs dns_resolver hid_generic usbhid hid af_packet uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev rfcomm btusb bnep bluetooth qmi_wwan qcserial cdc_wdm usb_wwan usbnet usbserial mii snd_hda_codec_hdmi snd_hda_codec_realtek iwldvm mac80211 coretemp intel_powerclamp kvm_intel kvm iwlwifi snd_hda_intel cfg80211 snd_hda_codec xhci_hcd e1000e ehci_pci snd_hwdep sdhci_pci snd_pcm ehci_hcd microcode psmouse sdhci thinkpad_acpi mmc_core i2c_i801 pcspkr usbcore hwmon snd_timer snd_page_alloc snd ptp rfkill pps_core soundcore evdev usb_common vboxnetflt(O) vboxdrv(O)Oops#2 Part8
 loop tun binfmt_misc fuse msr acpi_call(O) ipv6 autofs4
CPU: 0 PID: 21612 Comm: kworker/0:1 Tainted: G        W  O 3.10.1SIGN #28
Hardware name: LENOVO 2306CTO/2306CTO, BIOS G2ET92WW (2.52 ) 02/22/2013
Workqueue: cifsiod cifs_echo_request [cifs]
task: ffff8801e1f416f0 ti: ffff880148744000 task.ti: ffff880148744000
RIP: 0010:[<ffffffff814dcc13>]  [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
RSP: 0000:ffff880148745b00  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880148745b78 RCX: 0000000000000048
RDX: ffff880148745c90 RSI: ffff880181864a00 RDI: ffff880148745b78
RBP: ffff880148745c48 R08: 0000000000000048 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880181864a00
R13: ffff880148745c90 R14: 0000000000000048 R15: 0000000000000048
FS:  0000000000000000(0000) GS:ffff88021e200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 000000020c42c000 CR4: 00000000001407b0
Oops#2 Part7
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
 ffff880148745b30 ffffffff810c4af9 0000004848745b30 ffff880181864a00
 ffffffff81ffbc40 0000000000000000 ffff880148745c90 ffffffff810a5aab
 ffff880148745bc0 ffffffff81ffbc40 ffff880148745b60 ffffffff815a9fb8
Call Trace:
 [<ffffffff810c4af9>] ? finish_task_switch+0x49/0xe0
 [<ffffffff810a5aab>] ? lock_timer_base.isra.36+0x2b/0x50
 [<ffffffff815a9fb8>] ? _raw_spin_unlock_irqrestore+0x18/0x40
 [<ffffffff810a673f>] ? try_to_del_timer_sync+0x4f/0x70
 [<ffffffff815aa38f>] ? _raw_spin_unlock_bh+0x1f/0x30
 [<ffffffff814dcc87>] kernel_sendmsg+0x37/0x50
 [<ffffffffa081a0e0>] smb_send_kvec+0xd0/0x1d0 [cifs]
 [<ffffffffa081a263>] smb_send_rqst+0x83/0x1f0 [cifs]
 [<ffffffffa081ab6c>] cifs_call_async+0xec/0x1b0 [cifs]
 [<ffffffffa08245e0>] ? free_rsp_buf+0x40/0x40 [cifs]
Oops#2 Part6
 [<ffffffffa082606e>] SMB2_echo+0x8e/0xb0 [cifs]
 [<ffffffffa0808789>] cifs_echo_request+0x79/0xa0 [cifs]
 [<ffffffff810b45b3>] process_one_work+0x173/0x4a0
 [<ffffffff810b52a1>] worker_thread+0x121/0x3a0
 [<ffffffff810b5180>] ? manage_workers.isra.27+0x2b0/0x2b0
 [<ffffffff810bae00>] kthread+0xc0/0xd0
 [<ffffffff810bad40>] ? kthread_create_on_node+0x120/0x120
 [<ffffffff815b199c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810bad40>] ? kthread_create_on_node+0x120/0x120
Code: 84 24 b8 00 00 00 4c 89 f1 4c 89 ea 4c 89 e6 48 89 df 4c 89 60 18 48 c7 40 28 00 00 00 00 4c 89 68 30 44 89 70 14 49 8b 44 24 28 <ff> 90 88 00 00 00 3d ef fd ff ff 74 10 48 8d 65 e0 5b 41 5c 41
 RIP  [<ffffffff814dcc13>] sock_sendmsg+0x93/0xd0
 RSP <ffff880148745b00>
CR2: 0000000000000088

The client was in the middle of trying to send a frame when the
server->ssocket pointer got zeroed out. In most places, that we access
that pointer, the srv_mutex is held. There's only one spot that I see
that the server->ssocket pointer gets set and the srv_mutex isn't held.
This patch corrects that.

The upstream bug report was here:

    https://bugzilla.kernel.org/show_bug.cgi?id=60557

Reported-by: Oleksii Shevchuk <alxchk@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62d627e
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Nov 22, 2013
Borislav Petkov x86: Improve the printout of the SMP bootup CPU table
As the new x86 CPU bootup printout format code maintainer, I am
taking immediate action to improve and clean (and thus indulge
my OCD) the reporting of the cores when coming up online.

Fix padding to a right-hand alignment, cleanup code and bind
reporting width to the max number of supported CPUs on the
system, like this:

 [    0.074509] smpboot: Booting Node   0, Processors:      #1  #2  #3  #4  #5  #6  #7 OK
 [    0.644008] smpboot: Booting Node   1, Processors:  #8  #9 #10 #11 #12 #13 #14 #15 OK
 [    1.245006] smpboot: Booting Node   2, Processors: #16 #17 #18 #19 #20 #21 #22 #23 OK
 [    1.864005] smpboot: Booting Node   3, Processors: #24 #25 #26 #27 #28 #29 #30 #31 OK
 [    2.489005] smpboot: Booting Node   4, Processors: #32 #33 #34 #35 #36 #37 #38 #39 OK
 [    3.093005] smpboot: Booting Node   5, Processors: #40 #41 #42 #43 #44 #45 #46 #47 OK
 [    3.698005] smpboot: Booting Node   6, Processors: #48 #49 #50 #51 #52 #53 #54 #55 OK
 [    4.304005] smpboot: Booting Node   7, Processors: #56 #57 #58 #59 #60 #61 #62 #63 OK
 [    4.961413] Brought up 64 CPUs

and this:

 [    0.072367] smpboot: Booting Node   0, Processors:    #1 #2 #3 #4 #5 #6 #7 OK
 [    0.686329] Brought up 8 CPUs

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Libin <huawei.libin@huawei.com>
Cc: wangyijing@huawei.com
Cc: fenghua.yu@intel.com
Cc: guohanjun@huawei.com
Cc: paul.gortmaker@windriver.com
Link: http://lkml.kernel.org/r/20130927143554.GF4422@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>
646e29a
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Nov 22, 2013
Borislav Petkov x86/boot: Further compress CPUs bootup message
Turn it into (for example):

[    0.073380] x86: Booting SMP configuration:
[    0.074005] .... node   #0, CPUs:          #1   #2   #3   #4   #5   #6   #7
[    0.603005] .... node   #1, CPUs:     #8   #9  #10  #11  #12  #13  #14  #15
[    1.200005] .... node   #2, CPUs:    #16  #17  #18  #19  #20  #21  #22  #23
[    1.796005] .... node   #3, CPUs:    #24  #25  #26  #27  #28  #29  #30  #31
[    2.393005] .... node   #4, CPUs:    #32  #33  #34  #35  #36  #37  #38  #39
[    2.996005] .... node   #5, CPUs:    #40  #41  #42  #43  #44  #45  #46  #47
[    3.600005] .... node   #6, CPUs:    #48  #49  #50  #51  #52  #53  #54  #55
[    4.202005] .... node   #7, CPUs:    #56  #57  #58  #59  #60  #61  #62  #63
[    4.811005] .... node   #8, CPUs:    #64  #65  #66  #67  #68  #69  #70  #71
[    5.421006] .... node   #9, CPUs:    #72  #73  #74  #75  #76  #77  #78  #79
[    6.032005] .... node  #10, CPUs:    #80  #81  #82  #83  #84  #85  #86  #87
[    6.648006] .... node  #11, CPUs:    #88  #89  #90  #91  #92  #93  #94  #95
[    7.262005] .... node  #12, CPUs:    #96  #97  #98  #99 #100 #101 #102 #103
[    7.865005] .... node  #13, CPUs:   #104 #105 #106 #107 #108 #109 #110 #111
[    8.466005] .... node  #14, CPUs:   #112 #113 #114 #115 #116 #117 #118 #119
[    9.073006] .... node  #15, CPUs:   #120 #121 #122 #123 #124 #125 #126 #127
[    9.679901] x86: Booted up 16 nodes, 128 CPUs

and drop useless elements.

Change num_digits() to hpa's division-avoiding, cell-phone-typed
version which he went at great lengths and pains to submit on a
Saturday evening.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: huawei.libin@huawei.com
Cc: wangyijing@huawei.com
Cc: fenghua.yu@intel.com
Cc: guohanjun@huawei.com
Cc: paul.gortmaker@windriver.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20130930095624.GB16383@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>
a17bce4
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Nov 22, 2013
@larsclausen larsclausen i2c: Remove redundant 'driver' field from the i2c_client struct
The 'driver' field of the i2c_client struct is redundant. The same data can be
accessed through to_i2c_driver(client->dev.driver). The generated code for both
approaches in more or less the same.

E.g. on ARM the expression client->driver->command(...) generates

		...
		ldr     r3, [r0, #28]
		ldr     r3, [r3, #32]
		blx     r3
		...

and the expression to_i2c_driver(client->dev.driver)->command(...) generates

		...
		ldr     r3, [r0, #160]
    	ldr     r3, [r3, #-4]
    	blx     r3
		...

Other architectures will generate similar code.

All users of the 'driver' field outside of the I2C core have already been
converted. So this only leaves the core itself. This patch converts the
remaining few users in the I2C core and then removes the 'driver' field from the
i2c_client struct.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
0acc2b3
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Feb 1, 2014
@bwidawsk bwidawsk drm/i915/ppgtt: Defer request freeing on reset
We need to defer the free request until the object/vma is capable of
being freed - or else we have a problem  when we try to destroy the
context.

The exact same issue is described and fixed here:
commit e207804
Author: Ben Widawsky <ben@bwidawsk.net>
Date:   Fri Dec 6 14:11:22 2013 -0800

    drm/i915: Defer request freeing

I had this fix previously, but decided not to keep it for some reason I
can no longer remember.

gem_reset_stats is a really good test at hitting the problem.

For the inquisitive:
[  170.516392] ------------[ cut here ]------------
[  170.517227] WARNING: CPU: 1 PID: 105 at drivers/gpu/drm/drm_mm.c:578 drm_mm_takedown+0x2e/0x30 [drm]()
[  170.518064] Memory manager not clean during takedown.
[  170.518941] CPU: 1 PID: 105 Comm: kworker/1:1 Not tainted 3.13.0-rc4-BEN+ #28
[  170.519787] Hardware name: Hewlett-Packard HP EliteBook 8470p/179B, BIOS 68ICF Ver. F.02 04/27/2012
[  170.520662] Call Trace:
[  170.521517]  [<ffffffff814f0589>] dump_stack+0x4e/0x7a
[  170.522373]  [<ffffffff81049e6d>] warn_slowpath_common+0x7d/0xa0
[  170.523227]  [<ffffffff81049edc>] warn_slowpath_fmt+0x4c/0x50
[  170.524079]  [<ffffffffa06c414e>] drm_mm_takedown+0x2e/0x30 [drm]
[  170.524934]  [<ffffffffa07213f3>] gen6_ppgtt_cleanup+0x23/0x110
[i915]
[  170.525777]  [<ffffffffa07837ed>] ppgtt_release.part.5+0x24/0x29
[i915]
[  170.526603]  [<ffffffffa071aaa5>] i915_gem_context_free+0x195/0x1a0
[i915]
[  170.527423]  [<ffffffffa071189d>] i915_gem_free_request+0x9d/0xb0
[i915]
[  170.528247]  [<ffffffffa0718af9>] i915_gem_reset+0x1f9/0x3f0 [i915]
[  170.529065]  [<ffffffffa0700cce>] i915_reset+0x4e/0x180 [i915]
[  170.529870]  [<ffffffffa070829d>] i915_error_work_func+0xcd/0x120
[i915]
[  170.530666]  [<ffffffff8106c13a>] process_one_work+0x1fa/0x6d0
[  170.531453]  [<ffffffff8106c0d8>] ? process_one_work+0x198/0x6d0
[  170.532230]  [<ffffffff8106c72b>] worker_thread+0x11b/0x3a0
[  170.532996]  [<ffffffff8106c610>] ? process_one_work+0x6d0/0x6d0
[  170.533771]  [<ffffffff810743ef>] kthread+0xff/0x120
[  170.534548]  [<ffffffff810742f0>] ? insert_kthread_work+0x80/0x80
[  170.535322]  [<ffffffff814f97ac>] ret_from_fork+0x7c/0xb0
[  170.536089]  [<ffffffff810742f0>] ? insert_kthread_work+0x80/0x80
[  170.536847] ---[ end trace 3d4c12892e42d58f ]---

v2: Whitespace fix. (Chris)

Note: This is a bug that only hits the ppgtt topic branch but I've
figured that doing the request cleanup in this order is generally the
right thing to do.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Add a code comment to clarify what's actually going on since
the lifetime rules aroung ppgtt cleanup are ... fuzzy a best atm. Also
add a note about why we need this.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
1d62bee
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Oct 17, 2014
Dave Hansen x86, sched: Add new topology for multi-NUMA-node CPUs
I'm getting the spew below when booting with Haswell (Xeon
E5-2699 v3) CPUs and the "Cluster-on-Die" (CoD) feature enabled
in the BIOS.  It seems similar to the issue that some folks from
AMD ran in to on their systems and addressed in this commit:

  161270f ("x86/smp: Fix topology checks on AMD MCM CPUs")

Both these Intel and AMD systems break an assumption which is
being enforced by topology_sane(): a socket may not contain more
than one NUMA node.

AMD special-cased their system by looking for a cpuid flag.  The
Intel mode is dependent on BIOS options and I do not know of a
way which it is enumerated other than the tables being parsed
during the CPU bringup process.  In other words, we have to trust
the ACPI tables <shudder>.

This detects the situation where a NUMA node occurs at a place in
the middle of the "CPU" sched domains.  It replaces the default
topology with one that relies on the NUMA information from the
firmware (SRAT table) for all levels of sched domains above the
hyperthreads.

This also fixes a sysfs bug.  We used to freak out when we saw
the "mc" group cross a node boundary, so we stopped building the
MC group.  MC gets exported as the 'core_siblings_list' in
/sys/devices/system/cpu/cpu*/topology/ and this caused CPUs with
the same 'physical_package_id' to not be listed together in
'core_siblings_list'.  This violates a statement from
Documentation/ABI/testing/sysfs-devices-system-cpu:

	core_siblings: internal kernel map of cpu#'s hardware threads
	within the same physical_package_id.

	core_siblings_list: human-readable list of the logical CPU
	numbers within the same physical_package_id as cpu#.

The sysfs effects here cause an issue with the hwloc tool where
it gets confused and thinks there are more sockets than are
physically present.

Before this patch, there are two packages:

# cd /sys/devices/system/cpu/
# cat cpu*/topology/physical_package_id | sort | uniq -c
     18 0
     18 1

But 4 _sets_ of core siblings:

# cat cpu*/topology/core_siblings_list | sort | uniq -c
      9 0-8
      9 18-26
      9 27-35
      9 9-17

After this set, there are only 2 sets of core siblings, which
is what we expect for a 2-socket system.

# cat cpu*/topology/physical_package_id | sort | uniq -c
     18 0
     18 1
# cat cpu*/topology/core_siblings_list | sort | uniq -c
     18 0-17
     18 18-35

Example spew:
...
	NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter.
	 #2  #3  #4  #5  #6  #7  #8
	.... node  #1, CPUs:    #9
	------------[ cut here ]------------
	WARNING: CPU: 9 PID: 0 at /home/ak/hle/linux-hle-2.6/arch/x86/kernel/smpboot.c:306 topology_sane.isra.2+0x74/0x90()
	sched: CPU #9's mc-sibling CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency.
	Modules linked in:
	CPU: 9 PID: 0 Comm: swapper/9 Not tainted 3.17.0-rc1-00293-g8e01c4d-dirty #631
	Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRNDSDP1.86B.0036.R05.1407140519 07/14/2014
	0000000000000009 ffff88046ddabe00 ffffffff8172e485 ffff88046ddabe48
	ffff88046ddabe38 ffffffff8109691d 000000000000b001 0000000000000009
	ffff88086fc12580 000000000000b020 0000000000000009 ffff88046ddabe98
	Call Trace:
	[<ffffffff8172e485>] dump_stack+0x45/0x56
	[<ffffffff8109691d>] warn_slowpath_common+0x7d/0xa0
	[<ffffffff8109698c>] warn_slowpath_fmt+0x4c/0x50
	[<ffffffff81074f94>] topology_sane.isra.2+0x74/0x90
	[<ffffffff8107530e>] set_cpu_sibling_map+0x31e/0x4f0
	[<ffffffff8107568d>] start_secondary+0x1ad/0x240
	---[ end trace 3fe5f587a9fcde61 ]---
	#10 #11 #12 #13 #14 #15 #16 #17
	.... node  #2, CPUs:   #18 #19 #20 #21 #22 #23 #24 #25 #26
	.... node  #3, CPUs:   #27 #28 #29 #30 #31 #32 #33 #34 #35

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
[ Added LLC domain and s/match_mc/match_die/ ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: brice.goglin@gmail.com
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/20140918193334.C065EBCE@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
cebf15e
@swarren swarren pushed a commit to swarren/linux-rpi that referenced this pull request Nov 5, 2014
@pranith pranith powerpc: Wire up sys_bpf() syscall
This patch wires up the new syscall sys_bpf() on powerpc.

Passes the tests in samples/bpf:

    #0 add+sub+mul OK
    #1 unreachable OK
    #2 unreachable2 OK
    #3 out of range jump OK
    #4 out of range jump2 OK
    #5 test1 ld_imm64 OK
    #6 test2 ld_imm64 OK
    #7 test3 ld_imm64 OK
    #8 test4 ld_imm64 OK
    #9 test5 ld_imm64 OK
    #10 no bpf_exit OK
    #11 loop (back-edge) OK
    #12 loop2 (back-edge) OK
    #13 conditional loop OK
    #14 read uninitialized register OK
    #15 read invalid register OK
    #16 program doesn't init R0 before exit OK
    #17 stack out of bounds OK
    #18 invalid call insn1 OK
    #19 invalid call insn2 OK
    #20 invalid function call OK
    #21 uninitialized stack1 OK
    #22 uninitialized stack2 OK
    #23 check valid spill/fill OK
    #24 check corrupted spill/fill OK
    #25 invalid src register in STX OK
    #26 invalid dst register in STX OK
    #27 invalid dst register in ST OK
    #28 invalid src register in LDX OK
    #29 invalid dst register in LDX OK
    #30 junk insn OK
    #31 junk insn2 OK
    #32 junk insn3 OK
    #33 junk insn4 OK
    #34 junk insn5 OK
    #35 misaligned read from stack OK
    #36 invalid map_fd for function call OK
    #37 don't check return value before access OK
    #38 access memory with incorrect alignment OK
    #39 sometimes access memory with incorrect alignment OK
    #40 jump test 1 OK
    #41 jump test 2 OK
    #42 jump test 3 OK
    #43 jump test 4 OK

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
[mpe: test using samples/bpf]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
fcbb539
@davet321 davet321 pushed a commit to davet321/rpi-linux that referenced this pull request Aug 17, 2015
Michal Hocko mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations
commit ecf5fc6 upstream.

Nikolay has reported a hang when a memcg reclaim got stuck with the
following backtrace:

PID: 18308  TASK: ffff883d7c9b0a30  CPU: 1   COMMAND: "rsync"
  #0 __schedule at ffffffff815ab152
  #1 schedule at ffffffff815ab76e
  #2 schedule_timeout at ffffffff815ae5e5
  #3 io_schedule_timeout at ffffffff815aad6a
  #4 bit_wait_io at ffffffff815abfc6
  #5 __wait_on_bit at ffffffff815abda5
  #6 wait_on_page_bit at ffffffff8111fd4f
  #7 shrink_page_list at ffffffff81135445
  #8 shrink_inactive_list at ffffffff81135845
  #9 shrink_lruvec at ffffffff81135ead
 #10 shrink_zone at ffffffff811360c3
 #11 shrink_zones at ffffffff81136eff
 #12 do_try_to_free_pages at ffffffff8113712f
 #13 try_to_free_mem_cgroup_pages at ffffffff811372be
 #14 try_charge at ffffffff81189423
 #15 mem_cgroup_try_charge at ffffffff8118c6f5
 #16 __add_to_page_cache_locked at ffffffff8112137d
 #17 add_to_page_cache_lru at ffffffff81121618
 #18 pagecache_get_page at ffffffff8112170b
 #19 grow_dev_page at ffffffff811c8297
 #20 __getblk_slow at ffffffff811c91d6
 #21 __getblk_gfp at ffffffff811c92c1
 #22 ext4_ext_grow_indepth at ffffffff8124565c
 #23 ext4_ext_create_new_leaf at ffffffff81246ca8
 #24 ext4_ext_insert_extent at ffffffff81246f09
 #25 ext4_ext_map_blocks at ffffffff8124a848
 #26 ext4_map_blocks at ffffffff8121a5b7
 #27 mpage_map_one_extent at ffffffff8121b1fa
 #28 mpage_map_and_submit_extent at ffffffff8121f07b
 #29 ext4_writepages at ffffffff8121f6d5
 #30 do_writepages at ffffffff8112c490
 #31 __filemap_fdatawrite_range at ffffffff81120199
 #32 filemap_flush at ffffffff8112041c
 #33 ext4_alloc_da_blocks at ffffffff81219da1
 #34 ext4_rename at ffffffff81229b91
 #35 ext4_rename2 at ffffffff81229e32
 #36 vfs_rename at ffffffff811a08a5
 #37 SYSC_renameat2 at ffffffff811a3ffc
 #38 sys_renameat2 at ffffffff811a408e
 #39 sys_rename at ffffffff8119e51e
 #40 system_call_fastpath at ffffffff815afa89

Dave Chinner has properly pointed out that this is a deadlock in the
reclaim code because ext4 doesn't submit pages which are marked by
PG_writeback right away.

The heuristic was introduced by commit e62e384 ("memcg: prevent OOM
with too many dirty pages") and it was applied only when may_enter_fs
was specified.  The code has been changed by c3b94f4 ("memcg:
further prevent OOM with too many dirty pages") which has removed the
__GFP_FS restriction with a reasoning that we do not get into the fs
code.  But this is not sufficient apparently because the fs doesn't
necessarily submit pages marked PG_writeback for IO right away.

ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily
submit the bio.  Instead it tries to map more pages into the bio and
mpage_map_one_extent might trigger memcg charge which might end up
waiting on a page which is marked PG_writeback but hasn't been submitted
yet so we would end up waiting for something that never finishes.

Fix this issue by replacing __GFP_IO by may_enter_fs check (for case 2)
before we go to wait on the writeback.  The page fault path, which is
the only path that triggers memcg oom killer since 3.12, shouldn't
require GFP_NOFS and so we shouldn't reintroduce the premature OOM
killer issue which was originally addressed by the heuristic.

As per David Chinner the xfs is doing similar thing since 2.6.15 already
so ext4 is not the only affected filesystem.  Moreover he notes:

: For example: IO completion might require unwritten extent conversion
: which executes filesystem transactions and GFP_NOFS allocations. The
: writeback flag on the pages can not be cleared until unwritten
: extent conversion completes. Hence memory reclaim cannot wait on
: page writeback to complete in GFP_NOFS context because it is not
: safe to do so, memcg reclaim or otherwise.

Cc: stable@vger.kernel.org # 3.9+
[tytso@mit.edu: corrected the control flow]
Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages")
Reported-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7f488aa
@popcornmix popcornmix pushed a commit that referenced this pull request Aug 20, 2015
Michal Hocko mm, vmscan: Do not wait for page writeback for GFP_NOFS allocations
Nikolay has reported a hang when a memcg reclaim got stuck with the
following backtrace:

PID: 18308  TASK: ffff883d7c9b0a30  CPU: 1   COMMAND: "rsync"
  #0 __schedule at ffffffff815ab152
  #1 schedule at ffffffff815ab76e
  #2 schedule_timeout at ffffffff815ae5e5
  #3 io_schedule_timeout at ffffffff815aad6a
  #4 bit_wait_io at ffffffff815abfc6
  #5 __wait_on_bit at ffffffff815abda5
  #6 wait_on_page_bit at ffffffff8111fd4f
  #7 shrink_page_list at ffffffff81135445
  #8 shrink_inactive_list at ffffffff81135845
  #9 shrink_lruvec at ffffffff81135ead
 #10 shrink_zone at ffffffff811360c3
 #11 shrink_zones at ffffffff81136eff
 #12 do_try_to_free_pages at ffffffff8113712f
 #13 try_to_free_mem_cgroup_pages at ffffffff811372be
 #14 try_charge at ffffffff81189423
 #15 mem_cgroup_try_charge at ffffffff8118c6f5
 #16 __add_to_page_cache_locked at ffffffff8112137d
 #17 add_to_page_cache_lru at ffffffff81121618
 #18 pagecache_get_page at ffffffff8112170b
 #19 grow_dev_page at ffffffff811c8297
 #20 __getblk_slow at ffffffff811c91d6
 #21 __getblk_gfp at ffffffff811c92c1
 #22 ext4_ext_grow_indepth at ffffffff8124565c
 #23 ext4_ext_create_new_leaf at ffffffff81246ca8
 #24 ext4_ext_insert_extent at ffffffff81246f09
 #25 ext4_ext_map_blocks at ffffffff8124a848
 #26 ext4_map_blocks at ffffffff8121a5b7
 #27 mpage_map_one_extent at ffffffff8121b1fa
 #28 mpage_map_and_submit_extent at ffffffff8121f07b
 #29 ext4_writepages at ffffffff8121f6d5
 #30 do_writepages at ffffffff8112c490
 #31 __filemap_fdatawrite_range at ffffffff81120199
 #32 filemap_flush at ffffffff8112041c
 #33 ext4_alloc_da_blocks at ffffffff81219da1
 #34 ext4_rename at ffffffff81229b91
 #35 ext4_rename2 at ffffffff81229e32
 #36 vfs_rename at ffffffff811a08a5
 #37 SYSC_renameat2 at ffffffff811a3ffc
 #38 sys_renameat2 at ffffffff811a408e
 #39 sys_rename at ffffffff8119e51e
 #40 system_call_fastpath at ffffffff815afa89

Dave Chinner has properly pointed out that this is a deadlock in the
reclaim code because ext4 doesn't submit pages which are marked by
PG_writeback right away.

The heuristic was introduced by commit e62e384 ("memcg: prevent OOM
with too many dirty pages") and it was applied only when may_enter_fs
was specified.  The code has been changed by c3b94f4 ("memcg:
further prevent OOM with too many dirty pages") which has removed the
__GFP_FS restriction with a reasoning that we do not get into the fs
code.  But this is not sufficient apparently because the fs doesn't
necessarily submit pages marked PG_writeback for IO right away.

ext4_bio_write_page calls io_submit_add_bh but that doesn't necessarily
submit the bio.  Instead it tries to map more pages into the bio and
mpage_map_one_extent might trigger memcg charge which might end up
waiting on a page which is marked PG_writeback but hasn't been submitted
yet so we would end up waiting for something that never finishes.

Fix this issue by replacing __GFP_IO by may_enter_fs check (for case 2)
before we go to wait on the writeback.  The page fault path, which is
the only path that triggers memcg oom killer since 3.12, shouldn't
require GFP_NOFS and so we shouldn't reintroduce the premature OOM
killer issue which was originally addressed by the heuristic.

As per David Chinner the xfs is doing similar thing since 2.6.15 already
so ext4 is not the only affected filesystem.  Moreover he notes:

: For example: IO completion might require unwritten extent conversion
: which executes filesystem transactions and GFP_NOFS allocations. The
: writeback flag on the pages can not be cleared until unwritten
: extent conversion completes. Hence memory reclaim cannot wait on
: page writeback to complete in GFP_NOFS context because it is not
: safe to do so, memcg reclaim or otherwise.

Cc: stable@vger.kernel.org # 3.9+
[tytso@mit.edu: corrected the control flow]
Fixes: c3b94f4 ("memcg: further prevent OOM with too many dirty pages")
Reported-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
ecf5fc6
@anholt anholt referenced this pull request in anholt/linux Oct 12, 2015
@jasowang jasowang kvm: fix double free for fast mmio eventfd
We register wildcard mmio eventfd on two buses, once for KVM_MMIO_BUS
and once on KVM_FAST_MMIO_BUS but with a single iodev
instance. This will lead to an issue: kvm_io_bus_destroy() knows
nothing about the devices on two buses pointing to a single dev. Which
will lead to double free[1] during exit. Fix this by allocating two
instances of iodevs then registering one on KVM_MMIO_BUS and another
on KVM_FAST_MMIO_BUS.

CPU: 1 PID: 2894 Comm: qemu-system-x86 Not tainted 3.19.0-26-generic #28-Ubuntu
Hardware name: LENOVO 2356BG6/2356BG6, BIOS G7ET96WW (2.56 ) 09/12/2013
task: ffff88009ae0c4b0 ti: ffff88020e7f0000 task.ti: ffff88020e7f0000
RIP: 0010:[<ffffffffc07e25d8>]  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
RSP: 0018:ffff88020e7f3bc8  EFLAGS: 00010292
RAX: dead000000200200 RBX: ffff8801ec19c900 RCX: 000000018200016d
RDX: ffff8801ec19cf80 RSI: ffffea0008bf1d40 RDI: ffff8801ec19c900
RBP: ffff88020e7f3bd8 R08: 000000002fc75a01 R09: 000000018200016d
R10: ffffffffc07df6ae R11: ffff88022fc75a98 R12: ffff88021e7cc000
R13: ffff88021e7cca48 R14: ffff88021e7cca50 R15: ffff8801ec19c880
FS:  00007fc1ee3e6700(0000) GS:ffff88023e240000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f389d8000 CR3: 000000023dc13000 CR4: 00000000001427e0
Stack:
ffff88021e7cc000 0000000000000000 ffff88020e7f3be8 ffffffffc07e2622
ffff88020e7f3c38 ffffffffc07df69a ffff880232524160 ffff88020e792d80
 0000000000000000 ffff880219b78c00 0000000000000008 ffff8802321686a8
Call Trace:
[<ffffffffc07e2622>] ioeventfd_destructor+0x12/0x20 [kvm]
[<ffffffffc07df69a>] kvm_put_kvm+0xca/0x210 [kvm]
[<ffffffffc07df818>] kvm_vcpu_release+0x18/0x20 [kvm]
[<ffffffff811f69f7>] __fput+0xe7/0x250
[<ffffffff811f6bae>] ____fput+0xe/0x10
[<ffffffff81093f04>] task_work_run+0xd4/0xf0
[<ffffffff81079358>] do_exit+0x368/0xa50
[<ffffffff81082c8f>] ? recalc_sigpending+0x1f/0x60
[<ffffffff81079ad5>] do_group_exit+0x45/0xb0
[<ffffffff81085c71>] get_signal+0x291/0x750
[<ffffffff810144d8>] do_signal+0x28/0xab0
[<ffffffff810f3a3b>] ? do_futex+0xdb/0x5d0
[<ffffffff810b7028>] ? __wake_up_locked_key+0x18/0x20
[<ffffffff810f3fa6>] ? SyS_futex+0x76/0x170
[<ffffffff81014fc9>] do_notify_resume+0x69/0xb0
[<ffffffff817cb9af>] int_signal+0x12/0x17
Code: 5d c3 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 8b 7f 20 e8 06 d6 a5 c0 48 8b 43 08 48 8b 13 48 89 df 48 89 42 08 <48> 89 10 48 b8 00 01 10 00 00
 RIP  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
 RSP <ffff88020e7f3bc8>

Cc: stable@vger.kernel.org
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
eefd6b0
@popcornmix popcornmix pushed a commit that referenced this pull request Oct 23, 2015
@jasowang jasowang kvm: fix double free for fast mmio eventfd
commit eefd6b0 upstream.

We register wildcard mmio eventfd on two buses, once for KVM_MMIO_BUS
and once on KVM_FAST_MMIO_BUS but with a single iodev
instance. This will lead to an issue: kvm_io_bus_destroy() knows
nothing about the devices on two buses pointing to a single dev. Which
will lead to double free[1] during exit. Fix this by allocating two
instances of iodevs then registering one on KVM_MMIO_BUS and another
on KVM_FAST_MMIO_BUS.

CPU: 1 PID: 2894 Comm: qemu-system-x86 Not tainted 3.19.0-26-generic #28-Ubuntu
Hardware name: LENOVO 2356BG6/2356BG6, BIOS G7ET96WW (2.56 ) 09/12/2013
task: ffff88009ae0c4b0 ti: ffff88020e7f0000 task.ti: ffff88020e7f0000
RIP: 0010:[<ffffffffc07e25d8>]  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
RSP: 0018:ffff88020e7f3bc8  EFLAGS: 00010292
RAX: dead000000200200 RBX: ffff8801ec19c900 RCX: 000000018200016d
RDX: ffff8801ec19cf80 RSI: ffffea0008bf1d40 RDI: ffff8801ec19c900
RBP: ffff88020e7f3bd8 R08: 000000002fc75a01 R09: 000000018200016d
R10: ffffffffc07df6ae R11: ffff88022fc75a98 R12: ffff88021e7cc000
R13: ffff88021e7cca48 R14: ffff88021e7cca50 R15: ffff8801ec19c880
FS:  00007fc1ee3e6700(0000) GS:ffff88023e240000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f389d8000 CR3: 000000023dc13000 CR4: 00000000001427e0
Stack:
ffff88021e7cc000 0000000000000000 ffff88020e7f3be8 ffffffffc07e2622
ffff88020e7f3c38 ffffffffc07df69a ffff880232524160 ffff88020e792d80
 0000000000000000 ffff880219b78c00 0000000000000008 ffff8802321686a8
Call Trace:
[<ffffffffc07e2622>] ioeventfd_destructor+0x12/0x20 [kvm]
[<ffffffffc07df69a>] kvm_put_kvm+0xca/0x210 [kvm]
[<ffffffffc07df818>] kvm_vcpu_release+0x18/0x20 [kvm]
[<ffffffff811f69f7>] __fput+0xe7/0x250
[<ffffffff811f6bae>] ____fput+0xe/0x10
[<ffffffff81093f04>] task_work_run+0xd4/0xf0
[<ffffffff81079358>] do_exit+0x368/0xa50
[<ffffffff81082c8f>] ? recalc_sigpending+0x1f/0x60
[<ffffffff81079ad5>] do_group_exit+0x45/0xb0
[<ffffffff81085c71>] get_signal+0x291/0x750
[<ffffffff810144d8>] do_signal+0x28/0xab0
[<ffffffff810f3a3b>] ? do_futex+0xdb/0x5d0
[<ffffffff810b7028>] ? __wake_up_locked_key+0x18/0x20
[<ffffffff810f3fa6>] ? SyS_futex+0x76/0x170
[<ffffffff81014fc9>] do_notify_resume+0x69/0xb0
[<ffffffff817cb9af>] int_signal+0x12/0x17
Code: 5d c3 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 8b 7f 20 e8 06 d6 a5 c0 48 8b 43 08 48 8b 13 48 89 df 48 89 42 08 <48> 89 10 48 b8 00 01 10 00 00
 RIP  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
 RSP <ffff88020e7f3bc8>

Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2ab32d6
@popcornmix popcornmix pushed a commit that referenced this pull request Oct 23, 2015
@jasowang jasowang kvm: fix double free for fast mmio eventfd
commit eefd6b0 upstream.

We register wildcard mmio eventfd on two buses, once for KVM_MMIO_BUS
and once on KVM_FAST_MMIO_BUS but with a single iodev
instance. This will lead to an issue: kvm_io_bus_destroy() knows
nothing about the devices on two buses pointing to a single dev. Which
will lead to double free[1] during exit. Fix this by allocating two
instances of iodevs then registering one on KVM_MMIO_BUS and another
on KVM_FAST_MMIO_BUS.

CPU: 1 PID: 2894 Comm: qemu-system-x86 Not tainted 3.19.0-26-generic #28-Ubuntu
Hardware name: LENOVO 2356BG6/2356BG6, BIOS G7ET96WW (2.56 ) 09/12/2013
task: ffff88009ae0c4b0 ti: ffff88020e7f0000 task.ti: ffff88020e7f0000
RIP: 0010:[<ffffffffc07e25d8>]  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
RSP: 0018:ffff88020e7f3bc8  EFLAGS: 00010292
RAX: dead000000200200 RBX: ffff8801ec19c900 RCX: 000000018200016d
RDX: ffff8801ec19cf80 RSI: ffffea0008bf1d40 RDI: ffff8801ec19c900
RBP: ffff88020e7f3bd8 R08: 000000002fc75a01 R09: 000000018200016d
R10: ffffffffc07df6ae R11: ffff88022fc75a98 R12: ffff88021e7cc000
R13: ffff88021e7cca48 R14: ffff88021e7cca50 R15: ffff8801ec19c880
FS:  00007fc1ee3e6700(0000) GS:ffff88023e240000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f389d8000 CR3: 000000023dc13000 CR4: 00000000001427e0
Stack:
ffff88021e7cc000 0000000000000000 ffff88020e7f3be8 ffffffffc07e2622
ffff88020e7f3c38 ffffffffc07df69a ffff880232524160 ffff88020e792d80
 0000000000000000 ffff880219b78c00 0000000000000008 ffff8802321686a8
Call Trace:
[<ffffffffc07e2622>] ioeventfd_destructor+0x12/0x20 [kvm]
[<ffffffffc07df69a>] kvm_put_kvm+0xca/0x210 [kvm]
[<ffffffffc07df818>] kvm_vcpu_release+0x18/0x20 [kvm]
[<ffffffff811f69f7>] __fput+0xe7/0x250
[<ffffffff811f6bae>] ____fput+0xe/0x10
[<ffffffff81093f04>] task_work_run+0xd4/0xf0
[<ffffffff81079358>] do_exit+0x368/0xa50
[<ffffffff81082c8f>] ? recalc_sigpending+0x1f/0x60
[<ffffffff81079ad5>] do_group_exit+0x45/0xb0
[<ffffffff81085c71>] get_signal+0x291/0x750
[<ffffffff810144d8>] do_signal+0x28/0xab0
[<ffffffff810f3a3b>] ? do_futex+0xdb/0x5d0
[<ffffffff810b7028>] ? __wake_up_locked_key+0x18/0x20
[<ffffffff810f3fa6>] ? SyS_futex+0x76/0x170
[<ffffffff81014fc9>] do_notify_resume+0x69/0xb0
[<ffffffff817cb9af>] int_signal+0x12/0x17
Code: 5d c3 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 8b 7f 20 e8 06 d6 a5 c0 48 8b 43 08 48 8b 13 48 89 df 48 89 42 08 <48> 89 10 48 b8 00 01 10 00 00
 RIP  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
 RSP <ffff88020e7f3bc8>

Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
c286128
@ffeldbauer ffeldbauer pushed a commit to ffeldbauer/PandaRPiKernel that referenced this pull request Jan 28, 2016
@jasowang jasowang kvm: fix double free for fast mmio eventfd
commit eefd6b0 upstream.

We register wildcard mmio eventfd on two buses, once for KVM_MMIO_BUS
and once on KVM_FAST_MMIO_BUS but with a single iodev
instance. This will lead to an issue: kvm_io_bus_destroy() knows
nothing about the devices on two buses pointing to a single dev. Which
will lead to double free[1] during exit. Fix this by allocating two
instances of iodevs then registering one on KVM_MMIO_BUS and another
on KVM_FAST_MMIO_BUS.

CPU: 1 PID: 2894 Comm: qemu-system-x86 Not tainted 3.19.0-26-generic #28-Ubuntu
Hardware name: LENOVO 2356BG6/2356BG6, BIOS G7ET96WW (2.56 ) 09/12/2013
task: ffff88009ae0c4b0 ti: ffff88020e7f0000 task.ti: ffff88020e7f0000
RIP: 0010:[<ffffffffc07e25d8>]  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
RSP: 0018:ffff88020e7f3bc8  EFLAGS: 00010292
RAX: dead000000200200 RBX: ffff8801ec19c900 RCX: 000000018200016d
RDX: ffff8801ec19cf80 RSI: ffffea0008bf1d40 RDI: ffff8801ec19c900
RBP: ffff88020e7f3bd8 R08: 000000002fc75a01 R09: 000000018200016d
R10: ffffffffc07df6ae R11: ffff88022fc75a98 R12: ffff88021e7cc000
R13: ffff88021e7cca48 R14: ffff88021e7cca50 R15: ffff8801ec19c880
FS:  00007fc1ee3e6700(0000) GS:ffff88023e240000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f389d8000 CR3: 000000023dc13000 CR4: 00000000001427e0
Stack:
ffff88021e7cc000 0000000000000000 ffff88020e7f3be8 ffffffffc07e2622
ffff88020e7f3c38 ffffffffc07df69a ffff880232524160 ffff88020e792d80
 0000000000000000 ffff880219b78c00 0000000000000008 ffff8802321686a8
Call Trace:
[<ffffffffc07e2622>] ioeventfd_destructor+0x12/0x20 [kvm]
[<ffffffffc07df69a>] kvm_put_kvm+0xca/0x210 [kvm]
[<ffffffffc07df818>] kvm_vcpu_release+0x18/0x20 [kvm]
[<ffffffff811f69f7>] __fput+0xe7/0x250
[<ffffffff811f6bae>] ____fput+0xe/0x10
[<ffffffff81093f04>] task_work_run+0xd4/0xf0
[<ffffffff81079358>] do_exit+0x368/0xa50
[<ffffffff81082c8f>] ? recalc_sigpending+0x1f/0x60
[<ffffffff81079ad5>] do_group_exit+0x45/0xb0
[<ffffffff81085c71>] get_signal+0x291/0x750
[<ffffffff810144d8>] do_signal+0x28/0xab0
[<ffffffff810f3a3b>] ? do_futex+0xdb/0x5d0
[<ffffffff810b7028>] ? __wake_up_locked_key+0x18/0x20
[<ffffffff810f3fa6>] ? SyS_futex+0x76/0x170
[<ffffffff81014fc9>] do_notify_resume+0x69/0xb0
[<ffffffff817cb9af>] int_signal+0x12/0x17
Code: 5d c3 90 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 8b 7f 20 e8 06 d6 a5 c0 48 8b 43 08 48 8b 13 48 89 df 48 89 42 08 <48> 89 10 48 b8 00 01 10 00 00
 RIP  [<ffffffffc07e25d8>] ioeventfd_release+0x28/0x60 [kvm]
 RSP <ffff88020e7f3bc8>

Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
6694e13
@popcornmix popcornmix pushed a commit that referenced this pull request Oct 25, 2016
@dvyukov dvyukov kprobes: Unpoison stack in jprobe_return() for KASAN
I observed false KSAN positives in the sctp code, when
sctp uses jprobe_return() in jsctp_sf_eat_sack().

The stray 0xf4 in shadow memory are stack redzones:

[     ] ==================================================================
[     ] BUG: KASAN: stack-out-of-bounds in memcmp+0xe9/0x150 at addr ffff88005e48f480
[     ] Read of size 1 by task syz-executor/18535
[     ] page:ffffea00017923c0 count:0 mapcount:0 mapping:          (null) index:0x0
[     ] flags: 0x1fffc0000000000()
[     ] page dumped because: kasan: bad access detected
[     ] CPU: 1 PID: 18535 Comm: syz-executor Not tainted 4.8.0+ #28
[     ] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[     ]  ffff88005e48f2d0 ffffffff82d2b849 ffffffff0bc91e90 fffffbfff10971e8
[     ]  ffffed000bc91e90 ffffed000bc91e90 0000000000000001 0000000000000000
[     ]  ffff88005e48f480 ffff88005e48f350 ffffffff817d3169 ffff88005e48f370
[     ] Call Trace:
[     ]  [<ffffffff82d2b849>] dump_stack+0x12e/0x185
[     ]  [<ffffffff817d3169>] kasan_report+0x489/0x4b0
[     ]  [<ffffffff817d31a9>] __asan_report_load1_noabort+0x19/0x20
[     ]  [<ffffffff82d49529>] memcmp+0xe9/0x150
[     ]  [<ffffffff82df7486>] depot_save_stack+0x176/0x5c0
[     ]  [<ffffffff817d2031>] save_stack+0xb1/0xd0
[     ]  [<ffffffff817d27f2>] kasan_slab_free+0x72/0xc0
[     ]  [<ffffffff817d05b8>] kfree+0xc8/0x2a0
[     ]  [<ffffffff85b03f19>] skb_free_head+0x79/0xb0
[     ]  [<ffffffff85b0900a>] skb_release_data+0x37a/0x420
[     ]  [<ffffffff85b090ff>] skb_release_all+0x4f/0x60
[     ]  [<ffffffff85b11348>] consume_skb+0x138/0x370
[     ]  [<ffffffff8676ad7b>] sctp_chunk_put+0xcb/0x180
[     ]  [<ffffffff8676ae88>] sctp_chunk_free+0x58/0x70
[     ]  [<ffffffff8677fa5f>] sctp_inq_pop+0x68f/0xef0
[     ]  [<ffffffff8675ee36>] sctp_assoc_bh_rcv+0xd6/0x4b0
[     ]  [<ffffffff8677f2c1>] sctp_inq_push+0x131/0x190
[     ]  [<ffffffff867bad69>] sctp_backlog_rcv+0xe9/0xa20
[ ... ]
[     ] Memory state around the buggy address:
[     ]  ffff88005e48f380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[     ]  ffff88005e48f400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[     ] >ffff88005e48f480: f4 f4 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[     ]                    ^
[     ]  ffff88005e48f500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[     ]  ffff88005e48f580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[     ] ==================================================================

KASAN stack instrumentation poisons stack redzones on function entry
and unpoisons them on function exit. If a function exits abnormally
(e.g. with a longjmp like jprobe_return()), stack redzones are left
poisoned. Later this leads to random KASAN false reports.

Unpoison stack redzones in the frames we are going to jump over
before doing actual longjmp in jprobe_return().

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: kasan-dev@googlegroups.com
Cc: surovegin@google.com
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/1476454043-101898-1-git-send-email-dvyukov@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
9f7d416
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