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Panic running systrace-stringof-bad, kernel 3.2 #46

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cjdelisle opened this issue Dec 16, 2012 · 5 comments
Open

Panic running systrace-stringof-bad, kernel 3.2 #46

cjdelisle opened this issue Dec 16, 2012 · 5 comments

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@cjdelisle
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This is a log from it running in a KVM node. I ran the test on my laptop (also 3.2) and got a panic but did not spend the time to hook up a netconsole.
Linux debian 3.2.0-2-amd64 #1 SMP Mon Apr 30 05:20:23 UTC 2012 x86_64 GNU/Linux

I modified the source to build on Debian ( #45 ).
Let me know if there is anything else I can provide. I tried building with dtrace_printf() uncomented in dtrace_int_page_fault_handler() and it paniced in a different way, I suspect calling dtrace_printf() might have triggered another page fault.

[ 1431.895203] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1431.896036] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.896036] PGD 7a79e067 PUD 798be067 PMD 0 
[ 1431.896036] Oops: 0000 [#1] SMP 
[ 1431.896036] CPU 3 
[ 1431.896036] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.896036] 
[ 1431.896036] Pid: 4808, comm: du Tainted: P        W  O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.896036] RIP: 0010:[<ffffffffa01cbccd>]  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.896036] RSP: 0018:ffff880067527e80  EFLAGS: 00010282
[ 1431.896036] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000030900
[ 1431.896036] RDX: 0000000001849eb8 RSI: 0000000000000006 RDI: 000000000003a32d
[ 1431.896036] RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000183e650
[ 1431.896036] R10: 0000000000000003 R11: 0000000000000246 R12: 000000000003a32d
[ 1431.896036] R13: 0000000000000000 R14: 0000000001849eb8 R15: 0000000000000006
[ 1431.896036] FS:  00002ad3684c8b20(0000) GS:ffff88007fcc0000(0000) knlGS:00000000556e06c0
[ 1431.896036] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.896036] CR2: 0000000000000091 CR3: 00000000690f5000 CR4: 00000000000006e0
[ 1431.896036] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.896036] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.896036] Process du (pid: 4808, threadinfo ffff880067526000, task ffff88007aa289f0)
[ 1431.896036] Stack:
[ 1431.896036]  000000000183e650 0000000000000000 0000000000030900 0000000001849eb8
[ 1431.896036]  0000000000000006 000000000003a32d 0000000050ccc01c ffff88007aa45818
[ 1431.896036]  0000000000000000 ffffffffa01e69be 0000000000000003 0000000000000000
[ 1431.896036] Call Trace:
[ 1431.896036]  [<ffffffffa01e69be>] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.896036]  [<ffffffffa01e6cef>] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.896036]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1431.896036] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 <f6> 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74 
[ 1431.896036] RIP  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.896036]  RSP <ffff880067527e80>
[ 1431.896036] CR2: 0000000000000091
[ 1431.902812] BUG: unable to handle kernel 
[ 1431.984819] ---[ end trace 3895f73ef2b14e68 ]---
[ 1431.902812] NULL pointer dereference at 0000000000000091
[ 1431.902812] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.902812] PGD 0 
[ 1431.902812] Oops: 0000 [#2] SMP 
[ 1431.902812] CPU 2 
[ 1431.902812] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.902812] 
[ 1431.902812] Pid: 4854, comm: modprobe Tainted: P      D W  O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.902812] RIP: 0010:[<ffffffffa01cbccd>]  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.902812] RSP: 0018:ffff88006751de80  EFLAGS: 00010282
[ 1431.902812] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 000000000005ad20
[ 1431.902812] RDX: 0000000000090800 RSI: 00007faf4073571d RDI: 000000000003a12f
[ 1431.902812] RBP: 0000000000000000 R08: 0000000000000000 R09: 3436646d612d322d
[ 1431.902812] R10: 00007fff8c8c1fa2 R11: 0000000000000246 R12: 000000000003a12f
[ 1431.902812] R13: 0000000000000000 R14: 0000000000090800 R15: 00007faf4073571d
[ 1431.902812] FS:  00007faf40708700(0000) GS:ffff88007fc80000(0000) knlGS:00000000556e06c0
[ 1431.902812] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.902812] CR2: 0000000000000091 CR3: 000000006b8e8000 CR4: 00000000000006e0
[ 1431.902812] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.902812] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.902812] Process modprobe (pid: 4854, threadinfo ffff88006751c000, task ffff8800684f0e20)
[ 1431.902812] Stack:
[ 1431.902812]  3436646d612d322d 0000000000000000 000000000005ad20 0000000000090800
[ 1431.902812]  00007faf4073571d 000000000003a12f 000000004feabb91 ffff88007aa44030
[ 1431.902812]  0000000000000000 ffffffffa01e69be 00007fff8c8c1fa2 0000000000000000
[ 1431.902812] Call Trace:
[ 1431.902812]  [<ffffffffa01e69be>] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.902812]  [<ffffffffa01e6cef>] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.902812]  [<ffffffff813497f5>] ? page_fault+0x25/0x30
[ 1431.902812]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1431.902812] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 <f6> 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74 
[ 1431.902812] RIP  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.902812]  RSP <ffff88006751de80>
[ 1431.902812] CR2: 0000000000000091
[ 1431.900021] BUG: unable to handle kernel 
[ 1432.082166] ---[ end trace 3895f73ef2b14e69 ]---
[ 1432.083286] NULL pointer dereference at 0000000000000091
[ 1432.083286] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.083286] PGD 7a218067 PUD 6bbaf067 PMD 0 
[ 1432.083286] Oops: 0000 [#3] SMP 
[ 1432.083286] CPU 4 
[ 1432.083286] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1432.083286] 
[ 1432.083286] Pid: 4573, comm: dtrace Tainted: P      D W  O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1432.083286] RIP: 0010:[<ffffffffa01cbccd>]  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.083286] RSP: 0018:ffff88007fd03e70  EFLAGS: 00010282
[ 1432.083286] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000
[ 1432.083286] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000003a64f
[ 1432.083286] RBP: ffff88006626de00 R08: 0000000000000000 R09: 0000000000000000
[ 1432.083286] R10: 0000000000000001 R11: ffff88007fd0e780 R12: 0000000000000000
[ 1432.083286] R13: 0000000000000001 R14: 0000000000000006 R15: ffff880066609fd8
[ 1432.083286] FS:  00002b259d23adc0(0000) GS:ffff88007fd00000(0000) knlGS:00000000556e06c0
[ 1432.083286] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1432.083286] CR2: 0000000000000091 CR3: 000000006c579000 CR4: 00000000000006e0
[ 1432.083286] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1432.083286] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1432.083286] Process dtrace (pid: 4573, threadinfo ffff880066608000, task ffff88007aa2c240)
[ 1432.083286] Stack:
[ 1432.083286]  0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 1432.083286]  0000000000000000 ffffffff0003a64f 0000000000000297 0000000000000001
[ 1432.083286]  ffff88006626de00 ffffffffa01baec9 0000000000000020 ffffffffa02020a0
[ 1432.083286] Call Trace:
[ 1432.083286]  <IRQ> 
[ 1432.083286]  [<ffffffffa01baec9>] ? cyclic_tasklet_func+0xc1/0xe6 [dtracedrv]
[ 1432.083286]  [<ffffffff8104b646>] ? tasklet_action+0x73/0xc2
[ 1432.083286]  [<ffffffff8104be30>] ? __do_softirq+0xb9/0x177
[ 1432.083286]  [<ffffffff8135046c>] ? call_softirq+0x1c/0x30
[ 1432.083286]  [<ffffffff8100f8e5>] ? do_softirq+0x3c/0x7b
[ 1432.083286]  [<ffffffff8104c098>] ? irq_exit+0x3c/0x9a
[ 1432.083286]  [<ffffffff81023fe8>] ? smp_apic_timer_interrupt+0x74/0x82
[ 1432.083286]  [<ffffffff8134ecde>] ? apic_timer_interrupt+0x6e/0x80
[ 1432.083286]  <EOI> 
[ 1432.083286]  [<ffffffffa01d7e3a>] ? dtrace_bzero+0xc/0xf [dtracedrv]
[ 1432.083286]  [<ffffffffa01d86c4>] ? kmem_zalloc+0x26/0x54 [dtracedrv]
[ 1432.083286]  [<ffffffffa01e9248>] ? dtrace_state_buffer+0x3b3/0x640 [dtracedrv]
[ 1432.083286]  [<ffffffffa01d175d>] ? dtrace_state_go+0x576/0xa75 [dtracedrv]
[ 1432.083286]  [<ffffffffa01c236b>] ? dtrace_strcmp+0x1b/0x1b [dtracedrv]
[ 1432.083286]  [<ffffffffa01d50f2>] ? dtrace_ioctl+0xc7c/0x217a [dtracedrv]
[ 1432.083286]  [<ffffffffa01d5996>] ? dtrace_ioctl+0x1520/0x217a [dtracedrv]
[ 1432.083286]  [<ffffffff810c912e>] ? zone_page_state_add+0x14/0x23
[ 1432.083286]  [<ffffffff810b3b14>] ? find_get_page+0x40/0x63
[ 1432.083286]  [<ffffffff810363c7>] ? should_resched+0x5/0x23
[ 1432.083286]  [<ffffffff81347f4f>] ? _cond_resched+0x7/0x1c
[ 1432.083286]  [<ffffffff810b3c36>] ? lock_page+0x11/0x20
[ 1432.083286]  [<ffffffff810b3cb6>] ? find_lock_page+0x29/0x4a
[ 1432.083286]  [<ffffffff810c5934>] ? shmem_getpage_gfp+0x8f/0x47d
[ 1432.083286]  [<ffffffff810b41a9>] ? generic_file_buffered_write+0x1e3/0x259
[ 1432.083286]  [<ffffffff810c673a>] ? shmem_getxattr+0x6e/0xca
[ 1432.083286]  [<ffffffff810b3b14>] ? find_get_page+0x40/0x63
[ 1432.083286]  [<ffffffff810363c7>] ? should_resched+0x5/0x23
[ 1432.083286]  [<ffffffff81347f4f>] ? _cond_resched+0x7/0x1c
[ 1432.083286]  [<ffffffff810b5978>] ? filemap_fault+0x1e6/0x33e
[ 1432.083286]  [<ffffffff810f5c0d>] ? lookup_page_cgroup+0x2d/0x42
[ 1432.083286]  [<ffffffff810f1605>] ? mem_cgroup_update_page_stat+0x17/0xd4
[ 1432.083286]  [<ffffffff810cdd75>] ? __do_fault+0x371/0x3ac
[ 1432.083286]  [<ffffffff810d0044>] ? handle_pte_fault+0x298/0x79f
[ 1432.083286]  [<ffffffff810cd621>] ? pte_offset_kernel+0x16/0x35
[ 1432.083286]  [<ffffffffa01d7c94>] ? dtracedrv_ioctl.isra.3+0x3c/0x4d [dtracedrv]
[ 1432.083286]  [<ffffffffa01d7cb5>] ? dtracedrv_unlocked_ioctl+0x6/0xa [dtracedrv]
[ 1432.083286]  [<ffffffff81106599>] ? do_vfs_ioctl+0x459/0x49a
[ 1432.083286]  [<ffffffff81106625>] ? sys_ioctl+0x4b/0x72
[ 1432.083286]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1432.083286] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 <f6> 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74 
[ 1432.083286] RIP  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.083286]  RSP <ffff88007fd03e70>
[ 1432.083286] CR2: 0000000000000091
[ 1431.904071] BUG: unable to handle kernel 
[ 1432.262291] ---[ end trace 3895f73ef2b14e6a ]---
[ 1432.262294] Kernel panic - not syncing: Fatal exception in interrupt
[ 1432.262297] Pid: 4573, comm: dtrace Tainted: P      D W  O 3.2.0-2-amd64 #1
[ 1432.262299] Call Trace:
[ 1432.262300]  <IRQ>  [<ffffffff81342b3b>] ? panic+0x95/0x1a5
[ 1432.262310]  [<ffffffff8134a086>] ? oops_end+0xa9/0xb6
[ 1432.262313]  [<ffffffff81342487>] ? no_context+0x1ff/0x20e
[ 1432.262317]  [<ffffffff8134c099>] ? do_page_fault+0x1a8/0x337
[ 1432.262321]  [<ffffffff8104148d>] ? load_balance+0x85/0x629
[ 1432.262335]  [<ffffffffa004d96b>] ? ata_sff_hsm_move+0x5ed/0x616 [libata]
[ 1432.262344]  [<ffffffffa0007d51>] ? scsi_request_fn+0x33f/0x404 [scsi_mod]
[ 1432.262348]  [<ffffffff813497f5>] ? page_fault+0x25/0x30
[ 1432.262357]  [<ffffffffa01cbccd>] ? dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.262365]  [<ffffffffa01baec9>] ? cyclic_tasklet_func+0xc1/0xe6 [dtracedrv]
[ 1432.262368]  [<ffffffff8104b646>] ? tasklet_action+0x73/0xc2
[ 1432.262371]  [<ffffffff8104be30>] ? __do_softirq+0xb9/0x177
[ 1432.262375]  [<ffffffff8135046c>] ? call_softirq+0x1c/0x30
[ 1432.262378]  [<ffffffff8100f8e5>] ? do_softirq+0x3c/0x7b
[ 1432.262381]  [<ffffffff8104c098>] ? irq_exit+0x3c/0x9a
[ 1432.262385]  [<ffffffff81023fe8>] ? smp_apic_timer_interrupt+0x74/0x82
[ 1432.262388]  [<ffffffff8134ecde>] ? apic_timer_interrupt+0x6e/0x80
[ 1432.262389]  <EOI>  [<ffffffffa01d7e3a>] ? dtrace_bzero+0xc/0xf [dtracedrv]
[ 1432.262417]  [<ffffffffa01d86c4>] ? kmem_zalloc+0x26/0x54 [dtracedrv]
[ 1432.262424]  [<ffffffffa01e9248>] ? dtrace_state_buffer+0x3b3/0x640 [dtracedrv]
[ 1432.262433]  [<ffffffffa01d175d>] ? dtrace_state_go+0x576/0xa75 [dtracedrv]
[ 1432.262442]  [<ffffffffa01c236b>] ? dtrace_strcmp+0x1b/0x1b [dtracedrv]
[ 1432.262451]  [<ffffffffa01d50f2>] ? dtrace_ioctl+0xc7c/0x217a [dtracedrv]
[ 1432.262460]  [<ffffffffa01d5996>] ? dtrace_ioctl+0x1520/0x217a [dtracedrv]
[ 1432.262464]  [<ffffffff810c912e>] ? zone_page_state_add+0x14/0x23
[ 1432.262468]  [<ffffffff810b3b14>] ? find_get_page+0x40/0x63
[ 1432.262470]  [<ffffffff810363c7>] ? should_resched+0x5/0x23
[ 1432.262473]  [<ffffffff81347f4f>] ? _cond_resched+0x7/0x1c
[ 1432.262476]  [<ffffffff810b3c36>] ? lock_page+0x11/0x20
[ 1432.262479]  [<ffffffff810b3cb6>] ? find_lock_page+0x29/0x4a
[ 1432.262482]  [<ffffffff810c5934>] ? shmem_getpage_gfp+0x8f/0x47d
[ 1432.262486]  [<ffffffff810b41a9>] ? generic_file_buffered_write+0x1e3/0x259
[ 1432.262489]  [<ffffffff810c673a>] ? shmem_getxattr+0x6e/0xca
[ 1432.262492]  [<ffffffff810b3b14>] ? find_get_page+0x40/0x63
[ 1432.262494]  [<ffffffff810363c7>] ? should_resched+0x5/0x23
[ 1432.262497]  [<ffffffff81347f4f>] ? _cond_resched+0x7/0x1c
[ 1432.262500]  [<ffffffff810b5978>] ? filemap_fault+0x1e6/0x33e
[ 1432.262504]  [<ffffffff810f5c0d>] ? lookup_page_cgroup+0x2d/0x42
[ 1432.262507]  [<ffffffff810f1605>] ? mem_cgroup_update_page_stat+0x17/0xd4
[ 1432.262510]  [<ffffffff810cdd75>] ? __do_fault+0x371/0x3ac
[ 1432.262513]  [<ffffffff810d0044>] ? handle_pte_fault+0x298/0x79f
[ 1432.262516]  [<ffffffff810cd621>] ? pte_offset_kernel+0x16/0x35
[ 1432.262526]  [<ffffffffa01d7c94>] ? dtracedrv_ioctl.isra.3+0x3c/0x4d [dtracedrv]
[ 1432.262536]  [<ffffffffa01d7cb5>] ? dtracedrv_unlocked_ioctl+0x6/0xa [dtracedrv]
[ 1432.262539]  [<ffffffff81106599>] ? do_vfs_ioctl+0x459/0x49a
[ 1432.262543]  [<ffffffff81106625>] ? sys_ioctl+0x4b/0x72
[ 1432.262546]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1431.904071] NULL pointer dereference at 0000000000000091
[ 1431.904071] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.904071] PGD 0 
[ 1431.904071] Oops: 0000 [#4] SMP 
[ 1431.904071] CPU 5 
[ 1431.904071] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.904071] 
[ 1431.904071] Pid: 4858, comm: modprobe Tainted: P      D W  O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.904071] RIP: 0010:[<ffffffffa01cbccd>]  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.904071] RSP: 0018:ffff88006b8d9e80  EFLAGS: 00010282
[ 1431.904071] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000001
[ 1431.904071] RDX: 0000000000000000 RSI: 00007fabd90f32d0 RDI: 000000000003a12f
[ 1431.904071] RBP: 0000000000000000 R08: ffffffffffffffb0 R09: 00007fabd92fa570
[ 1431.904071] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003a12f
[ 1431.904071] R13: 0000000000000000 R14: 0000000000000000 R15: 00007fabd90f32d0
[ 1431.904071] FS:  00002b2c6c40ab20(0000) GS:ffff88007fd40000(0000) knlGS:00000000556e06c0
[ 1431.904071] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.904071] CR2: 0000000000000091 CR3: 000000006753f000 CR4: 00000000000006e0
[ 1431.904071] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.904071] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.904071] Process modprobe (pid: 4858, threadinfo ffff88006b8d8000, task ffff880067909750)
[ 1431.904071] Stack:
[ 1431.904071]  00007fabd92fa570 ffffffffffffffb0 0000000000000001 0000000000000000
[ 1431.904071]  00007fabd90f32d0 ffff88000003a12f 0000000200000001 ffff88007aa44030
[ 1431.904071]  0000000000000000 ffffffffa01e69be 0000000000000000 00000000000000d0
[ 1431.904071] Call Trace:
[ 1431.904071]  [<ffffffffa01e69be>] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.904071]  [<ffffffff810ebb4f>] ? kmem_cache_alloc+0x86/0xea
[ 1431.904071]  [<ffffffffa01e6cef>] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.904071]  [<ffffffff813497f5>] ? page_fault+0x25/0x30
[ 1431.904071]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1431.904071] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 <f6> 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74 
[ 1431.904071] RIP  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.904071]  RSP <ffff88006b8d9e80>
[ 1431.904071] CR2: 0000000000000091
[ 1431.996070] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1431.996070] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.996070] PGD 37121067 PUD 690e6067 PMD 0 
[ 1431.996070] Oops: 0000 [#5] SMP 
[ 1431.996070] CPU 0 
[ 1431.996070] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.996070] 
[ 1431.996070] Pid: 4545, comm: tests.pl Tainted: P      D W  O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.996070] RIP: 0010:[<ffffffffa01cbccd>]  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.996070] RSP: 0018:ffff88006bba5e80  EFLAGS: 00010282
[ 1431.996070] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000000001b6
[ 1431.996070] RDX: 0000000000000000 RSI: 0000000001b34890 RDI: 000000000003a12f
[ 1431.996070] RBP: 0000000000000000 R08: 00002b2c6b556510 R09: 00000000000001b6
[ 1431.996070] R10: 00000000ffffffff R11: 0000000000000246 R12: 000000000003a12f
[ 1431.996070] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000001b34890
[ 1431.996070] FS:  00002b2c6c40ab20(0000) GS:ffff88007fc00000(0000) knlGS:00000000556e06c0
[ 1431.996070] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.996070] CR2: 0000000000000091 CR3: 000000007a64b000 CR4: 00000000000006f0
[ 1431.996070] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.996070] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.996070] Process tests.pl (pid: 4545, threadinfo ffff88006bba4000, task ffff88007c104040)
[ 1431.996070] Stack:
[ 1431.996070]  00000000000001b6 00002b2c6b556510 00000000000001b6 0000000000000000
[ 1431.996070]  0000000001b34890 000000000003a12f 0000000050ccc01c ffff88007aa44030
[ 1431.996070]  0000000000000000 ffffffffa01e69be 00000000ffffffff 0000000000000000
[ 1431.996070] Call Trace:
[ 1431.996070]  [<ffffffffa01e69be>] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.996070]  [<ffffffffa01e6cef>] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.996070]  [<ffffffff813497f5>] ? page_fault+0x25/0x30
[ 1431.996070]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1431.996070] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 <f6> 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74 
[ 1431.996070] RIP  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.996070]  RSP <ffff88006bba5e80>
[ 1431.996070] CR2: 0000000000000091
[ 1432.088036] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1432.088036] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088036] PGD 0 
[ 1432.088036] Oops: 0000 [#6] SMP 
[ 1432.088036] CPU 3 
[ 1432.088036] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1432.088036] 
[ 1432.088036] Pid: 4864, comm: modprobe Tainted: P      D W  O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1432.088036] RIP: 0010:[<ffffffffa01cbccd>]  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088036] RSP: 0018:ffff88006b8d1e80  EFLAGS: 00010282
[ 1432.088036] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000001
[ 1432.088036] RDX: 0000000000000000 RSI: 00007f8d951892d0 RDI: 000000000003a12f
[ 1432.088036] RBP: 0000000000000000 R08: ffffffffffffffb0 R09: 00007f8d95390570
[ 1432.088036] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003a12f
[ 1432.088036] R13: 0000000000000000 R14: 0000000000000000 R15: 00007f8d951892d0
[ 1432.088036] FS:  00002b5b722b4b20(0000) GS:ffff88007fcc0000(0000) knlGS:00000000556e06c0
[ 1432.088036] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1432.088036] CR2: 0000000000000091 CR3: 0000000066d00000 CR4: 00000000000006e0
[ 1432.088036] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1432.088036] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1432.088036] Process modprobe (pid: 4864, threadinfo ffff88006b8d0000, task ffff88007aaa9750)
[ 1432.088036] Stack:
[ 1432.088036]  00007f8d95390570 ffffffffffffffb0 0000000000000001 0000000000000000
[ 1432.088036]  00007f8d951892d0 ffff88000003a12f 0000000200000001 ffff88007aa44030
[ 1432.088036]  0000000000000000 ffffffffa01e69be 0000000000000000 00000000000000d0
[ 1432.088036] Call Trace:
[ 1432.088036]  [<ffffffffa01e69be>] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1432.088036]  [<ffffffff810ebb4f>] ? kmem_cache_alloc+0x86/0xea
[ 1432.088036]  [<ffffffffa01e6cef>] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1432.088036]  [<ffffffff813497f5>] ? page_fault+0x25/0x30
[ 1432.088036]  [<ffffffff8134e212>] ? system_call_fastpath+0x16/0x1b
[ 1432.088036] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 <f6> 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74 
[ 1432.088036] RIP  [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088036]  RSP <ffff88006b8d1e80>
[ 1432.088036] CR2: 0000000000000091
[ 1432.088016] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1432.088016] IP: [<ffffffffa01cbccd>] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088016] PGD 6b8c4067 PUD 66677067 PMD 0 
[ 1432.088016] Oops: 0000 [#7] SMP 
[ 1432.088016] CPU 2 
[ 1432.088016] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcsp

Processor on the host is an AMD 6128. The guest is running with -smp 6
In the guest /proc/cpuinfo appears as:

processor   : 5
vendor_id   : AuthenticAMD
cpu family  : 15
model       : 6
model name  : AMD Opteron 23xx (Gen 3 Class Opteron)
stepping    : 1
microcode   : 0x1000065
cpu MHz     : 1999.999
cache size  : 512 KB
fpu     : yes
fpu_exception   : yes
cpuid level : 5
wp      : yes
flags       : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl extd_apicid pni cx16 popcnt hypervisor svm abm sse4a misalignsse
bogomips    : 3999.99
TLB size    : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:
@cjdelisle
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Set a breakpoint on inter.c:625 in kvm/gdb and it was never hit so it appears that DTRACE_CPUFLAG_ISSET(CPU_DTRACE_NOFAULT) is always false.
I also put a breakpoint on line 622 but removed this soon after as it was triggering constantly so the function seems to be properly entering.

@cjdelisle
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I thought I had a semi-coherent bug report, now it seems to be degrading into "nothing works" :(
It seems that all syscall traces trigger oops and fbt:::{} worked but caused an error when cancelling the trace. Discouragingly, an OpenIndiana kvm node on the same box decided to crap out while I was testing and now it won't boot. Do you think it's a good idea to look at UML for testing? It makes sense that we should have a way to easily share a kernel which fails rather than everyone having their own virtualization solution.

@dtrace4linux
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Thanks for the report Caleb. I have never tested with KVM - looks like the
problem is in the area of updating the page tables so we can modify the
system call vector table - this is similar to what I saw with Xen. I will
have to set up a KVM VM and see whats happening.

Thanks for the report (I need to look at your patch as well); may take me a
little while to look at this - if you have instructions/links for setting
up the KVM that will be helpful.

On 16 December 2012 02:43, Caleb James DeLisle notifications@github.comwrote:

This is a log from it running in a KVM node. I ran the test on my laptop
(also 3.2) and got a panic but did not spend the time to hook up a
netconsole.
Linux debian 3.2.0-2-amd64 #1https://github.com/dtrace4linux/linux/issues/1SMP Mon Apr 30 05:20:23 UTC 2012 x86_64 GNU/Linux

I modified the source to build on Debian ( #45#45).
Let me know if there is anything else I can provide. I tried building with
dtrace_printf() uncomented in dtrace_int_page_fault_handler() and it
paniced in a different way, I suspect calling dtrace_printf() might have
triggered another page fault.

[ 1431.895203] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1431.896036] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.896036] PGD 7a79e067 PUD 798be067 PMD 0
[ 1431.896036] Oops: 0000 [#1] SMP
[ 1431.896036] CPU 3
[ 1431.896036] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.896036]
[ 1431.896036] Pid: 4808, comm: du Tainted: P W O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.896036] RIP: 0010:[] [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.896036] RSP: 0018:ffff880067527e80 EFLAGS: 00010282
[ 1431.896036] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000030900
[ 1431.896036] RDX: 0000000001849eb8 RSI: 0000000000000006 RDI: 000000000003a32d
[ 1431.896036] RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000183e650
[ 1431.896036] R10: 0000000000000003 R11: 0000000000000246 R12: 000000000003a32d
[ 1431.896036] R13: 0000000000000000 R14: 0000000001849eb8 R15: 0000000000000006
[ 1431.896036] FS: 00002ad3684c8b20(0000) GS:ffff88007fcc0000(0000) knlGS:00000000556e06c0
[ 1431.896036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.896036] CR2: 0000000000000091 CR3: 00000000690f5000 CR4: 00000000000006e0
[ 1431.896036] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.896036] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.896036] Process du (pid: 4808, threadinfo ffff880067526000, task ffff88007aa289f0)
[ 1431.896036] Stack:
[ 1431.896036] 000000000183e650 0000000000000000 0000000000030900 0000000001849eb8
[ 1431.896036] 0000000000000006 000000000003a32d 0000000050ccc01c ffff88007aa45818
[ 1431.896036] 0000000000000000 ffffffffa01e69be 0000000000000003 0000000000000000
[ 1431.896036] Call Trace:
[ 1431.896036] [] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.896036] [] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.896036] [] ? system_call_fastpath+0x16/0x1b
[ 1431.896036] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74
[ 1431.896036] RIP [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.896036] RSP
[ 1431.896036] CR2: 0000000000000091
[ 1431.902812] BUG: unable to handle kernel
[ 1431.984819] ---[ end trace 3895f73ef2b14e68 ]---
[ 1431.902812] NULL pointer dereference at 0000000000000091
[ 1431.902812] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.902812] PGD 0
[ 1431.902812] Oops: 0000 [#2] SMP
[ 1431.902812] CPU 2
[ 1431.902812] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.902812]
[ 1431.902812] Pid: 4854, comm: modprobe Tainted: P D W O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.902812] RIP: 0010:[] [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.902812] RSP: 0018:ffff88006751de80 EFLAGS: 00010282
[ 1431.902812] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 000000000005ad20
[ 1431.902812] RDX: 0000000000090800 RSI: 00007faf4073571d RDI: 000000000003a12f
[ 1431.902812] RBP: 0000000000000000 R08: 0000000000000000 R09: 3436646d612d322d
[ 1431.902812] R10: 00007fff8c8c1fa2 R11: 0000000000000246 R12: 000000000003a12f
[ 1431.902812] R13: 0000000000000000 R14: 0000000000090800 R15: 00007faf4073571d
[ 1431.902812] FS: 00007faf40708700(0000) GS:ffff88007fc80000(0000) knlGS:00000000556e06c0
[ 1431.902812] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.902812] CR2: 0000000000000091 CR3: 000000006b8e8000 CR4: 00000000000006e0
[ 1431.902812] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.902812] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.902812] Process modprobe (pid: 4854, threadinfo ffff88006751c000, task ffff8800684f0e20)
[ 1431.902812] Stack:
[ 1431.902812] 3436646d612d322d 0000000000000000 000000000005ad20 0000000000090800
[ 1431.902812] 00007faf4073571d 000000000003a12f 000000004feabb91 ffff88007aa44030
[ 1431.902812] 0000000000000000 ffffffffa01e69be 00007fff8c8c1fa2 0000000000000000
[ 1431.902812] Call Trace:
[ 1431.902812] [] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.902812] [] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.902812] [] ? page_fault+0x25/0x30
[ 1431.902812] [] ? system_call_fastpath+0x16/0x1b
[ 1431.902812] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74
[ 1431.902812] RIP [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.902812] RSP
[ 1431.902812] CR2: 0000000000000091
[ 1431.900021] BUG: unable to handle kernel
[ 1432.082166] ---[ end trace 3895f73ef2b14e69 ]---
[ 1432.083286] NULL pointer dereference at 0000000000000091
[ 1432.083286] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.083286] PGD 7a218067 PUD 6bbaf067 PMD 0
[ 1432.083286] Oops: 0000 [#3] SMP
[ 1432.083286] CPU 4
[ 1432.083286] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1432.083286]
[ 1432.083286] Pid: 4573, comm: dtrace Tainted: P D W O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1432.083286] RIP: 0010:[] [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.083286] RSP: 0018:ffff88007fd03e70 EFLAGS: 00010282
[ 1432.083286] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000
[ 1432.083286] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000003a64f
[ 1432.083286] RBP: ffff88006626de00 R08: 0000000000000000 R09: 0000000000000000
[ 1432.083286] R10: 0000000000000001 R11: ffff88007fd0e780 R12: 0000000000000000
[ 1432.083286] R13: 0000000000000001 R14: 0000000000000006 R15: ffff880066609fd8
[ 1432.083286] FS: 00002b259d23adc0(0000) GS:ffff88007fd00000(0000) knlGS:00000000556e06c0
[ 1432.083286] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1432.083286] CR2: 0000000000000091 CR3: 000000006c579000 CR4: 00000000000006e0
[ 1432.083286] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1432.083286] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1432.083286] Process dtrace (pid: 4573, threadinfo ffff880066608000, task ffff88007aa2c240)
[ 1432.083286] Stack:
[ 1432.083286] 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 1432.083286] 0000000000000000 ffffffff0003a64f 0000000000000297 0000000000000001
[ 1432.083286] ffff88006626de00 ffffffffa01baec9 0000000000000020 ffffffffa02020a0
[ 1432.083286] Call Trace:
[ 1432.083286]
[ 1432.083286] [] ? cyclic_tasklet_func+0xc1/0xe6 [dtracedrv]
[ 1432.083286] [] ? tasklet_action+0x73/0xc2
[ 1432.083286] [] ? __do_softirq+0xb9/0x177
[ 1432.083286] [] ? call_softirq+0x1c/0x30
[ 1432.083286] [] ? do_softirq+0x3c/0x7b
[ 1432.083286] [] ? irq_exit+0x3c/0x9a
[ 1432.083286] [] ? smp_apic_timer_interrupt+0x74/0x82
[ 1432.083286] [] ? apic_timer_interrupt+0x6e/0x80
[ 1432.083286]
[ 1432.083286] [] ? dtrace_bzero+0xc/0xf [dtracedrv]
[ 1432.083286] [] ? kmem_zalloc+0x26/0x54 [dtracedrv]
[ 1432.083286] [] ? dtrace_state_buffer+0x3b3/0x640 [dtracedrv]
[ 1432.083286] [] ? dtrace_state_go+0x576/0xa75 [dtracedrv]
[ 1432.083286] [] ? dtrace_strcmp+0x1b/0x1b [dtracedrv]
[ 1432.083286] [] ? dtrace_ioctl+0xc7c/0x217a [dtracedrv]
[ 1432.083286] [] ? dtrace_ioctl+0x1520/0x217a [dtracedrv]
[ 1432.083286] [] ? zone_page_state_add+0x14/0x23
[ 1432.083286] [] ? find_get_page+0x40/0x63
[ 1432.083286] [] ? should_resched+0x5/0x23
[ 1432.083286] [] ? _cond_resched+0x7/0x1c
[ 1432.083286] [] ? lock_page+0x11/0x20
[ 1432.083286] [] ? find_lock_page+0x29/0x4a
[ 1432.083286] [] ? shmem_getpage_gfp+0x8f/0x47d
[ 1432.083286] [] ? generic_file_buffered_write+0x1e3/0x259
[ 1432.083286] [] ? shmem_getxattr+0x6e/0xca
[ 1432.083286] [] ? find_get_page+0x40/0x63
[ 1432.083286] [] ? should_resched+0x5/0x23
[ 1432.083286] [] ? _cond_resched+0x7/0x1c
[ 1432.083286] [] ? filemap_fault+0x1e6/0x33e
[ 1432.083286] [] ? lookup_page_cgroup+0x2d/0x42
[ 1432.083286] [] ? mem_cgroup_update_page_stat+0x17/0xd4
[ 1432.083286] [] ? __do_fault+0x371/0x3ac
[ 1432.083286] [] ? handle_pte_fault+0x298/0x79f
[ 1432.083286] [] ? pte_offset_kernel+0x16/0x35
[ 1432.083286] [] ? dtracedrv_ioctl.isra.3+0x3c/0x4d [dtracedrv]
[ 1432.083286] [] ? dtracedrv_unlocked_ioctl+0x6/0xa [dtracedrv]
[ 1432.083286] [] ? do_vfs_ioctl+0x459/0x49a
[ 1432.083286] [] ? sys_ioctl+0x4b/0x72
[ 1432.083286] [] ? system_call_fastpath+0x16/0x1b
[ 1432.083286] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74
[ 1432.083286] RIP [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.083286] RSP
[ 1432.083286] CR2: 0000000000000091
[ 1431.904071] BUG: unable to handle kernel
[ 1432.262291] ---[ end trace 3895f73ef2b14e6a ]---
[ 1432.262294] Kernel panic - not syncing: Fatal exception in interrupt
[ 1432.262297] Pid: 4573, comm: dtrace Tainted: P D W O 3.2.0-2-amd64 #1
[ 1432.262299] Call Trace:
[ 1432.262300] [] ? panic+0x95/0x1a5
[ 1432.262310] [] ? oops_end+0xa9/0xb6
[ 1432.262313] [] ? no_context+0x1ff/0x20e
[ 1432.262317] [] ? do_page_fault+0x1a8/0x337
[ 1432.262321] [] ? load_balance+0x85/0x629
[ 1432.262335] [] ? ata_sff_hsm_move+0x5ed/0x616 [libata]
[ 1432.262344] [] ? scsi_request_fn+0x33f/0x404 [scsi_mod]
[ 1432.262348] [] ? page_fault+0x25/0x30
[ 1432.262357] [] ? dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.262365] [] ? cyclic_tasklet_func+0xc1/0xe6 [dtracedrv]
[ 1432.262368] [] ? tasklet_action+0x73/0xc2
[ 1432.262371] [] ? __do_softirq+0xb9/0x177
[ 1432.262375] [] ? call_softirq+0x1c/0x30
[ 1432.262378] [] ? do_softirq+0x3c/0x7b
[ 1432.262381] [] ? irq_exit+0x3c/0x9a
[ 1432.262385] [] ? smp_apic_timer_interrupt+0x74/0x82
[ 1432.262388] [] ? apic_timer_interrupt+0x6e/0x80
[ 1432.262389] [] ? dtrace_bzero+0xc/0xf [dtracedrv]
[ 1432.262417] [] ? kmem_zalloc+0x26/0x54 [dtracedrv]
[ 1432.262424] [] ? dtrace_state_buffer+0x3b3/0x640 [dtracedrv]
[ 1432.262433] [] ? dtrace_state_go+0x576/0xa75 [dtracedrv]
[ 1432.262442] [] ? dtrace_strcmp+0x1b/0x1b [dtracedrv]
[ 1432.262451] [] ? dtrace_ioctl+0xc7c/0x217a [dtracedrv]
[ 1432.262460] [] ? dtrace_ioctl+0x1520/0x217a [dtracedrv]
[ 1432.262464] [] ? zone_page_state_add+0x14/0x23
[ 1432.262468] [] ? find_get_page+0x40/0x63
[ 1432.262470] [] ? should_resched+0x5/0x23
[ 1432.262473] [] ? _cond_resched+0x7/0x1c
[ 1432.262476] [] ? lock_page+0x11/0x20
[ 1432.262479] [] ? find_lock_page+0x29/0x4a
[ 1432.262482] [] ? shmem_getpage_gfp+0x8f/0x47d
[ 1432.262486] [] ? generic_file_buffered_write+0x1e3/0x259
[ 1432.262489] [] ? shmem_getxattr+0x6e/0xca
[ 1432.262492] [] ? find_get_page+0x40/0x63
[ 1432.262494] [] ? should_resched+0x5/0x23
[ 1432.262497] [] ? _cond_resched+0x7/0x1c
[ 1432.262500] [] ? filemap_fault+0x1e6/0x33e
[ 1432.262504] [] ? lookup_page_cgroup+0x2d/0x42
[ 1432.262507] [] ? mem_cgroup_update_page_stat+0x17/0xd4
[ 1432.262510] [] ? __do_fault+0x371/0x3ac
[ 1432.262513] [] ? handle_pte_fault+0x298/0x79f
[ 1432.262516] [] ? pte_offset_kernel+0x16/0x35
[ 1432.262526] [] ? dtracedrv_ioctl.isra.3+0x3c/0x4d [dtracedrv]
[ 1432.262536] [] ? dtracedrv_unlocked_ioctl+0x6/0xa [dtracedrv]
[ 1432.262539] [] ? do_vfs_ioctl+0x459/0x49a
[ 1432.262543] [] ? sys_ioctl+0x4b/0x72
[ 1432.262546] [] ? system_call_fastpath+0x16/0x1b
[ 1431.904071] NULL pointer dereference at 0000000000000091
[ 1431.904071] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.904071] PGD 0
[ 1431.904071] Oops: 0000 [#4] SMP
[ 1431.904071] CPU 5
[ 1431.904071] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.904071]
[ 1431.904071] Pid: 4858, comm: modprobe Tainted: P D W O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.904071] RIP: 0010:[] [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.904071] RSP: 0018:ffff88006b8d9e80 EFLAGS: 00010282
[ 1431.904071] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000001
[ 1431.904071] RDX: 0000000000000000 RSI: 00007fabd90f32d0 RDI: 000000000003a12f
[ 1431.904071] RBP: 0000000000000000 R08: ffffffffffffffb0 R09: 00007fabd92fa570
[ 1431.904071] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003a12f
[ 1431.904071] R13: 0000000000000000 R14: 0000000000000000 R15: 00007fabd90f32d0
[ 1431.904071] FS: 00002b2c6c40ab20(0000) GS:ffff88007fd40000(0000) knlGS:00000000556e06c0
[ 1431.904071] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.904071] CR2: 0000000000000091 CR3: 000000006753f000 CR4: 00000000000006e0
[ 1431.904071] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.904071] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.904071] Process modprobe (pid: 4858, threadinfo ffff88006b8d8000, task ffff880067909750)
[ 1431.904071] Stack:
[ 1431.904071] 00007fabd92fa570 ffffffffffffffb0 0000000000000001 0000000000000000
[ 1431.904071] 00007fabd90f32d0 ffff88000003a12f 0000000200000001 ffff88007aa44030
[ 1431.904071] 0000000000000000 ffffffffa01e69be 0000000000000000 00000000000000d0
[ 1431.904071] Call Trace:
[ 1431.904071] [] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.904071] [] ? kmem_cache_alloc+0x86/0xea
[ 1431.904071] [] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.904071] [] ? page_fault+0x25/0x30
[ 1431.904071] [] ? system_call_fastpath+0x16/0x1b
[ 1431.904071] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74
[ 1431.904071] RIP [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.904071] RSP
[ 1431.904071] CR2: 0000000000000091
[ 1431.996070] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1431.996070] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.996070] PGD 37121067 PUD 690e6067 PMD 0
[ 1431.996070] Oops: 0000 [#5] SMP
[ 1431.996070] CPU 0
[ 1431.996070] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1431.996070]
[ 1431.996070] Pid: 4545, comm: tests.pl Tainted: P D W O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1431.996070] RIP: 0010:[] [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.996070] RSP: 0018:ffff88006bba5e80 EFLAGS: 00010282
[ 1431.996070] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000000001b6
[ 1431.996070] RDX: 0000000000000000 RSI: 0000000001b34890 RDI: 000000000003a12f
[ 1431.996070] RBP: 0000000000000000 R08: 00002b2c6b556510 R09: 00000000000001b6
[ 1431.996070] R10: 00000000ffffffff R11: 0000000000000246 R12: 000000000003a12f
[ 1431.996070] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000001b34890
[ 1431.996070] FS: 00002b2c6c40ab20(0000) GS:ffff88007fc00000(0000) knlGS:00000000556e06c0
[ 1431.996070] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1431.996070] CR2: 0000000000000091 CR3: 000000007a64b000 CR4: 00000000000006f0
[ 1431.996070] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1431.996070] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1431.996070] Process tests.pl (pid: 4545, threadinfo ffff88006bba4000, task ffff88007c104040)
[ 1431.996070] Stack:
[ 1431.996070] 00000000000001b6 00002b2c6b556510 00000000000001b6 0000000000000000
[ 1431.996070] 0000000001b34890 000000000003a12f 0000000050ccc01c ffff88007aa44030
[ 1431.996070] 0000000000000000 ffffffffa01e69be 00000000ffffffff 0000000000000000
[ 1431.996070] Call Trace:
[ 1431.996070] [] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1431.996070] [] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1431.996070] [] ? page_fault+0x25/0x30
[ 1431.996070] [] ? system_call_fastpath+0x16/0x1b
[ 1431.996070] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74
[ 1431.996070] RIP [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1431.996070] RSP
[ 1431.996070] CR2: 0000000000000091
[ 1432.088036] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1432.088036] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088036] PGD 0
[ 1432.088036] Oops: 0000 [#6] SMP
[ 1432.088036] CPU 3
[ 1432.088036] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcspkr serio_raw i2c_piix4 i2c_core parport button ext4 crc16 jbd2 mbcache sr_mod sd_mod cdrom crc_t10dif ata_generic floppy 8139too 8139cp ata_piix mii libata scsi_mod [last unloaded: scsi_wait_scan]
[ 1432.088036]
[ 1432.088036] Pid: 4864, comm: modprobe Tainted: P D W O 3.2.0-2-amd64 #1 Bochs Bochs
[ 1432.088036] RIP: 0010:[] [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088036] RSP: 0018:ffff88006b8d1e80 EFLAGS: 00010282
[ 1432.088036] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000001
[ 1432.088036] RDX: 0000000000000000 RSI: 00007f8d951892d0 RDI: 000000000003a12f
[ 1432.088036] RBP: 0000000000000000 R08: ffffffffffffffb0 R09: 00007f8d95390570
[ 1432.088036] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000003a12f
[ 1432.088036] R13: 0000000000000000 R14: 0000000000000000 R15: 00007f8d951892d0
[ 1432.088036] FS: 00002b5b722b4b20(0000) GS:ffff88007fcc0000(0000) knlGS:00000000556e06c0
[ 1432.088036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1432.088036] CR2: 0000000000000091 CR3: 0000000066d00000 CR4: 00000000000006e0
[ 1432.088036] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1432.088036] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 1432.088036] Process modprobe (pid: 4864, threadinfo ffff88006b8d0000, task ffff88007aaa9750)
[ 1432.088036] Stack:
[ 1432.088036] 00007f8d95390570 ffffffffffffffb0 0000000000000001 0000000000000000
[ 1432.088036] 00007f8d951892d0 ffff88000003a12f 0000000200000001 ffff88007aa44030
[ 1432.088036] 0000000000000000 ffffffffa01e69be 0000000000000000 00000000000000d0
[ 1432.088036] Call Trace:
[ 1432.088036] [] ? dtrace_systrace_syscall2+0xa5/0x231 [dtracedrv]
[ 1432.088036] [] ? kmem_cache_alloc+0x86/0xea
[ 1432.088036] [] ? dtrace_systrace_syscall+0xcf/0xd4 [dtracedrv]
[ 1432.088036] [] ? page_fault+0x25/0x30
[ 1432.088036] [] ? system_call_fastpath+0x16/0x1b
[ 1432.088036] Code: 44 24 08 4c 89 0c 24 e8 99 56 01 00 48 8b 80 c0 00 00 00 48 8b 54 24 18 48 8b 4c 24 10 48 8b 74 24 20 8b 7c 24 28 4c 8b 44 24 08 80 91 00 00 00 02 4c 8b 0c 24 74 1c 83 3d 87 df 05 00 00 74
[ 1432.088036] RIP [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088036] RSP
[ 1432.088036] CR2: 0000000000000091
[ 1432.088016] BUG: unable to handle kernel NULL pointer dereference at 0000000000000091
[ 1432.088016] IP: [] dtrace_probe+0x5b/0x199 [dtracedrv]
[ 1432.088016] PGD 6b8c4067 PUD 66677067 PMD 0
[ 1432.088016] Oops: 0000 [#7] SMP
[ 1432.088016] CPU 2
[ 1432.088016] Modules linked in: dtracedrv(P) loop snd_pcm snd_page_alloc snd_timer snd soundcore psmouse processor parport_pc thermal_sys evdev pcsp

Processor on the host is an AMD 6128. The guest is running with -smp 6
In the guest /proc/cpuinfo appears as:

processor : 5
vendor_id : AuthenticAMD
cpu family : 15
model : 6
model name : AMD Opteron 23xx (Gen 3 Class Opteron)
stepping : 1
microcode : 0x1000065
cpu MHz : 1999.999
cache size : 512 KB
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm rep_good nopl extd_apicid pni cx16 popcnt hypervisor svm abm sse4a misalignsse
bogomips : 3999.99
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

�
Reply to this email directly or view it on GitHubhttps://github.com//issues/46.

@cjdelisle
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I have not tested this all the way through but it should work ok.
https://ezcrypt.it/NG5n#hdukyvLNtJZwd7cae6Tdzu3Q

@dtrace4linux
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Brilliant - thank you Caleb - very useful, especially as you included the
wget link.

On 16 December 2012 10:37, Caleb James DeLisle notifications@github.comwrote:

I have not tested this all the way through but it should work ok.
https://ezcrypt.it/NG5n#hdukyvLNtJZwd7cae6Tdzu3Q

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/46#issuecomment-11416348.

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@cjdelisle @dtrace4linux