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Change unwrap()s to expect()s in module.rs #90

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ojeda opened this issue Feb 20, 2021 · 4 comments · Fixed by #142
Closed

Change unwrap()s to expect()s in module.rs #90

ojeda opened this issue Feb 20, 2021 · 4 comments · Fixed by #142
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• lib Related to the `rust/` library.

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@ojeda
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ojeda commented Feb 20, 2021

Although we don't get output unless we use -Z proc-macro-backtrace, it is a good idea to provide some more details like we do for some of the others, e.g. in:

fn expect_punct(it: &mut token_stream::IntoIter) -> char {
    if let TokenTree::Punct(punct) = it.next().unwrap() {
    ...

This unwrap() may fail if we find the end of the stream unexpectedly (because the user didn't pass the arguments that we expected).
@ojeda ojeda added upstream - optional • lib Related to the `rust/` library. labels Feb 20, 2021
@ojeda ojeda mentioned this issue Feb 20, 2021
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@Sylfrena
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Hullo,
Can I work on this issue?

@ojeda
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ojeda commented Mar 17, 2021

Of course!

@Sylfrena
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@ojeda Hi, this is something that should be obvious to me, but i am not really sure how to compile the changes I make. Rustc gives me these errors (which are not related to the changes I made). And using
make CC=clang M=rust is not really catching errors (I tried introducing some).
Running make for the entire kernel is sort of time taking, but is that the only way, or I am I missing something here?

@ojeda
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ojeda commented Mar 22, 2021 •
edited

No worries! In general, the mailing list is best for things like this.

Running make for the entire kernel is sort of time taking, but is that the only way, or I am I missing something here?

Running make CC=clang for the entire kernel should only recompile what is needed -- even with a single core it should be very quick (handful of seconds) to reach the point where it compiles the Rust code if everything else is already compiled. Are you perhaps cleaning the build every time? Avoid using M=, it shouldn't be needed for your use case.

@Sylfrena Sylfrena mentioned this issue Mar 23, 2021
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@ojeda ojeda closed this as completed in #142 Apr 5, 2021
ojeda pushed a commit that referenced this issue Apr 5, 2021
@Sylfrena
rust: module.rs: Replace unwrap() with expect()
94892ca 
Use expect() instead of unwrap() to add more details
about the error in case of a panic.

Fixes #90.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
fbq pushed a commit that referenced this issue Dec 28, 2023
@chantra @anakryiko
selftests/bpf: Fixes tests for filesystem kfuncs
f77d795 
`fs_kfuncs.c`'s `test_xattr` would fail the test even when the
filesystem did not support xattr, for instance when /tmp is mounted as
tmpfs.

This change checks errno when setxattr fail. If the failure is due to
the operation being unsupported, we will skip the test (just like we
would if verity was not enabled on the FS.

Before the change, fs_kfuncs test would fail in test_axattr:

 $ vmtest -k $(make -s image_name) './tools/testing/selftests/bpf/test_progs -a fs_kfuncs'
 => bzImage
 ===> Booting
 [    0.000000] rcu:        RCU restricting CPUs from NR_CPUS=128 to
 nr_cpu_
 ===> Setting up VM
 ===> Running command
 [    4.157491] bpf_testmod: loading out-of-tree module taints kernel.
 [    4.161515] bpf_testmod: module verification failed: signature and/or
 required key missing - tainting kernel
 test_xattr:PASS:create_file 0 nsec
 test_xattr:FAIL:setxattr unexpected error: -1 (errno 95)
 #90/1    fs_kfuncs/xattr:FAIL
 #90/2    fs_kfuncs/fsverity:SKIP
 #90      fs_kfuncs:FAIL

 All error logs:
 test_xattr:PASS:create_file 0 nsec
 test_xattr:FAIL:setxattr unexpected error: -1 (errno 95)
 #90/1    fs_kfuncs/xattr:FAIL
 #90      fs_kfuncs:FAIL

 Summary: 0/0 PASSED, 1 SKIPPED, 1 FAILED

Test plan:

  $ touch tmpfs_file && truncate -s 1G tmpfs_file && mkfs.ext4 tmpfs_file
  # /tmp mounted as tmpfs
  $ vmtest -k $(make -s image_name) './tools/testing/selftests/bpf/test_progs -a fs_kfuncs'
  => bzImage
  ===> Booting
  ===> Setting up VM
  ===> Running command
  WARNING! Selftests relying on bpf_testmod.ko will be skipped.
  Can't find bpf_testmod.ko kernel module: -2
  #90/1    fs_kfuncs/xattr:SKIP
  #90/2    fs_kfuncs/fsverity:SKIP
  #90      fs_kfuncs:SKIP
  Summary: 1/0 PASSED, 2 SKIPPED, 0 FAILED
  # /tmp mounted as ext4 with xattr enabled but not verity
  $ vmtest -k $(make -s image_name) 'mount -o loop tmpfs_file /tmp && \
    /tools/testing/selftests/bpf/test_progs -a fs_kfuncs'
  => bzImage
  ===> Booting
  ===> Setting up VM
  ===> Running command
  [    4.067071] loop0: detected capacity change from 0 to 2097152
  [    4.191882] EXT4-fs (loop0): mounted filesystem
  407ffa36-4553-4c8c-8c78-134443630f69 r/w with ordered data mode. Quota
  mode: none.
  WARNING! Selftests relying on bpf_testmod.ko will be skipped.
  Can't find bpf_testmod.ko kernel module: -2
  #90/1    fs_kfuncs/xattr:OK
  #90/2    fs_kfuncs/fsverity:SKIP
  #90      fs_kfuncs:OK (SKIP: 1/2)
  Summary: 1/1 PASSED, 1 SKIPPED, 0 FAILED
  $ tune2fs -O verity tmpfs_file
  # /tmp as ext4 with both xattr and verity enabled
  $ vmtest -k $(make -s image_name) 'mount -o loop tmpfs_file /tmp && \
    ./tools/testing/selftests/bpf/test_progs -a fs_kfuncs'
  => bzImage
  ===> Booting
  ===> Setting up VM
  ===> Running command
  [    4.291434] loop0: detected capacity change from 0 to 2097152
  [    4.460828] EXT4-fs (loop0): recovery complete
  [    4.468631] EXT4-fs (loop0): mounted filesystem
  7b4a7b7f-c442-4b06-9ede-254e63cceb52 r/w with ordered data mode. Quota
  mode: none.
  [    4.988074] fs-verity: sha256 using implementation "sha256-generic"
  WARNING! Selftests relying on bpf_testmod.ko will be skipped.
  Can't find bpf_testmod.ko kernel module: -2
  #90/1    fs_kfuncs/xattr:OK
  #90/2    fs_kfuncs/fsverity:OK
  #90      fs_kfuncs:OK
  Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED

Fixes: 341f06f ("selftests/bpf: Add tests for filesystem kfuncs")
Signed-off-by: Manu Bretelle <chantr4@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20231211180733.763025-1-chantr4@gmail.com
ojeda pushed a commit that referenced this issue Jan 22, 2024
@Damenly
bcachefs: kvfree bch_fs::snapshots in bch2_fs_snapshots_exit
369acf9 
bch_fs::snapshots is allocated by kvzalloc in __snapshot_t_mut.
It should be freed by kvfree not kfree.
Or umount will triger:

[  406.829178 ] BUG: unable to handle page fault for address: ffffe7b487148008
[  406.830676 ] #PF: supervisor read access in kernel mode
[  406.831643 ] #PF: error_code(0x0000) - not-present page
[  406.832487 ] PGD 0 P4D 0
[  406.832898 ] Oops: 0000 [#1] PREEMPT SMP PTI
[  406.833512 ] CPU: 2 PID: 1754 Comm: umount Kdump: loaded Tainted: G           OE      6.7.0-rc7-custom+ #90
[  406.834746 ] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014
[  406.835796 ] RIP: 0010:kfree+0x62/0x140
[  406.836197 ] Code: 80 48 01 d8 0f 82 e9 00 00 00 48 c7 c2 00 00 00 80 48 2b 15 78 9f 1f 01 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 56 9f 1f 01 <48> 8b 50 08 48 89 c7 f6 c2 01 0f 85 b0 00 00 00 66 90 48 8b 07 f6
[  406.837810 ] RSP: 0018:ffffb9d641607e48 EFLAGS: 00010286
[  406.838213 ] RAX: ffffe7b487148000 RBX: ffffb9d645200000 RCX: ffffb9d641607dc4
[  406.838738 ] RDX: 000065bb00000000 RSI: ffffffffc0d88b84 RDI: ffffb9d645200000
[  406.839217 ] RBP: ffff9a4625d00068 R08: 0000000000000001 R09: 0000000000000001
[  406.839650 ] R10: 0000000000000001 R11: 000000000000001f R12: ffff9a4625d4da80
[  406.840055 ] R13: ffff9a4625d00000 R14: ffffffffc0e2eb20 R15: 0000000000000000
[  406.840451 ] FS:  00007f0a264ffb80(0000) GS:ffff9a4e2d500000(0000) knlGS:0000000000000000
[  406.840851 ] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  406.841125 ] CR2: ffffe7b487148008 CR3: 000000018c4d2000 CR4: 00000000000006f0
[  406.841464 ] Call Trace:
[  406.841583 ]  <TASK>
[  406.841682 ]  ? __die+0x1f/0x70
[  406.841828 ]  ? page_fault_oops+0x159/0x470
[  406.842014 ]  ? fixup_exception+0x22/0x310
[  406.842198 ]  ? exc_page_fault+0x1ed/0x200
[  406.842382 ]  ? asm_exc_page_fault+0x22/0x30
[  406.842574 ]  ? bch2_fs_release+0x54/0x280 [bcachefs]
[  406.842842 ]  ? kfree+0x62/0x140
[  406.842988 ]  ? kfree+0x104/0x140
[  406.843138 ]  bch2_fs_release+0x54/0x280 [bcachefs]
[  406.843390 ]  kobject_put+0xb7/0x170
[  406.843552 ]  deactivate_locked_super+0x2f/0xa0
[  406.843756 ]  cleanup_mnt+0xba/0x150
[  406.843917 ]  task_work_run+0x59/0xa0
[  406.844083 ]  exit_to_user_mode_prepare+0x197/0x1a0
[  406.844302 ]  syscall_exit_to_user_mode+0x16/0x40
[  406.844510 ]  do_syscall_64+0x4e/0xf0
[  406.844675 ]  entry_SYSCALL_64_after_hwframe+0x6e/0x76
[  406.844907 ] RIP: 0033:0x7f0a2664e4fb

Signed-off-by: Su Yue <glass.su@suse.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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rust: module.rs: Replace unwrap() with expect() Sylfrena/linux
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@ojeda @Sylfrena