Bug 1266661 - Why abrt not catch kernel crash? [NEEDINFO]
Why abrt not catch kernel crash?
Status: ASSIGNED
Product: Fedora
Classification: Fedora
Component: abrt (Show other bugs)
25
Unspecified Unspecified
unspecified Severity unspecified
: ---
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Assigned To: abrt
Fedora Extras Quality Assurance
:
Depends On:
Blocks:
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Reported: 2015-09-26 05:27 EDT by Mikhail
Modified: 2016-11-30 19:53 EST (History)
11 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Type: Bug
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
aarapov: needinfo? (poros)


Attachments (Terms of Use)
dmesg (268.29 KB, text/plain)
2015-09-26 05:27 EDT, Mikhail
no flags Details

  None (edit)
Description Mikhail 2015-09-26 05:27:15 EDT
Description of problem:

I see in dmesg log messages:

[  233.467351] usb 1-9.1.3: ep 0x82 - rounding interval to 64 microframes, ep desc says 80 microframes

[  233.469146] ======================================================
[  233.469148] [ INFO: possible circular locking dependency detected ]
[  233.469150] 4.2.1-300.fc23.x86_64+debug #1 Not tainted
[  233.469151] -------------------------------------------------------
[  233.469153] V4L2CaptureThre/5173 is trying to acquire lock:
[  233.469154]  (s_active#18){++++.+}, at: [<ffffffff812fd0e9>] kernfs_remove_by_name_ns+0x49/0xa0
[  233.469164] 
               but task is already holding lock:
[  233.469165]  (&gspca_dev->queue_lock){+.+.+.}, at: [<ffffffffa04e4b84>] vidioc_streamon+0x44/0xe0 [gspca_main]
[  233.469171] 
               which lock already depends on the new lock.

[  233.469173] 
               the existing dependency chain (in reverse order) is:
[  233.469175] 
               -> #2 (&gspca_dev->queue_lock){+.+.+.}:
[  233.469178]        [<ffffffff8110aac7>] lock_acquire+0xc7/0x270
[  233.469182]        [<ffffffff8186da6f>] mutex_lock_interruptible_nested+0x7f/0x460
[  233.469186]        [<ffffffffa04e37b6>] dev_mmap+0x56/0x250 [gspca_main]
[  233.469188]        [<ffffffffa07dd114>] v4l2_mmap+0x54/0x90 [videodev]
[  233.469193]        [<ffffffff812248cb>] mmap_region+0x3eb/0x670
[  233.469197]        [<ffffffff81224e5f>] do_mmap_pgoff+0x30f/0x3f0
[  233.469199]        [<ffffffff81206dbd>] vm_mmap_pgoff+0xad/0xe0
[  233.469201]        [<ffffffff81223202>] SyS_mmap_pgoff+0x1f2/0x290
[  233.469204]        [<ffffffff81022d2b>] SyS_mmap+0x1b/0x30
[  233.469207]        [<ffffffff81871d6e>] entry_SYSCALL_64_fastpath+0x12/0x76
[  233.469210] 
               -> #1 (&mm->mmap_sem){++++++}:
[  233.469213]        [<ffffffff8110aac7>] lock_acquire+0xc7/0x270
[  233.469216]        [<ffffffff81218f0a>] __might_fault+0x7a/0xa0
[  233.469219]        [<ffffffff812fdc6f>] kernfs_fop_write+0x8f/0x190
[  233.469221]        [<ffffffff8126fbc7>] __vfs_write+0x37/0x100
[  233.469225]        [<ffffffff812705d9>] vfs_write+0xa9/0x1a0
[  233.469227]        [<ffffffff812712f8>] SyS_write+0x58/0xd0
[  233.469229]        [<ffffffff81871d6e>] entry_SYSCALL_64_fastpath+0x12/0x76
[  233.469231] 
               -> #0 (s_active#18){++++.+}:
[  233.469235]        [<ffffffff81109eb8>] __lock_acquire+0x1a78/0x1d00
[  233.469237]        [<ffffffff8110aac7>] lock_acquire+0xc7/0x270
[  233.469240]        [<ffffffff812fc398>] __kernfs_remove+0x288/0x380
[  233.469242]        [<ffffffff812fd0e9>] kernfs_remove_by_name_ns+0x49/0xa0
[  233.469244]        [<ffffffff812feaf5>] sysfs_remove_file_ns+0x15/0x20
[  233.469247]        [<ffffffff81576778>] device_del+0x138/0x270
[  233.469249]        [<ffffffff815768d2>] device_unregister+0x22/0x70
[  233.469251]        [<ffffffff81620fb3>] usb_remove_ep_devs+0x23/0x40
[  233.469255]        [<ffffffff81619681>] remove_intf_ep_devs+0x41/0x60
[  233.469258]        [<ffffffff8161a45a>] usb_set_interface+0x19a/0x390
[  233.469260]        [<ffffffffa04e45c3>] gspca_init_transfer+0x4d3/0xa50 [gspca_main]
[  233.469263]        [<ffffffffa04e4be0>] vidioc_streamon+0xa0/0xe0 [gspca_main]
[  233.469265]        [<ffffffffa07de95a>] v4l_streamon+0x1a/0x20 [videodev]
[  233.469269]        [<ffffffffa07e223d>] __video_do_ioctl+0x29d/0x310 [videodev]
[  233.469272]        [<ffffffffa07e42c2>] video_usercopy+0x3c2/0x830 [videodev]
[  233.469276]        [<ffffffffa07e4745>] video_ioctl2+0x15/0x20 [videodev]
[  233.469279]        [<ffffffffa07dd693>] v4l2_ioctl+0xb3/0xe0 [videodev]
[  233.469283]        [<ffffffff812858ae>] do_vfs_ioctl+0x2ee/0x550
[  233.469286]        [<ffffffff81285b89>] SyS_ioctl+0x79/0x90
[  233.469288]        [<ffffffff81871d6e>] entry_SYSCALL_64_fastpath+0x12/0x76
[  233.469291] 
               other info that might help us debug this:

[  233.469292] Chain exists of:
                 s_active#18 --> &mm->mmap_sem --> &gspca_dev->queue_lock

[  233.469296]  Possible unsafe locking scenario:

[  233.469298]        CPU0                    CPU1
[  233.469299]        ----                    ----
[  233.469299]   lock(&gspca_dev->queue_lock);
[  233.469301]                                lock(&mm->mmap_sem);
[  233.469303]                                lock(&gspca_dev->queue_lock);
[  233.469305]   lock(s_active#18);
[  233.469308] 
                *** DEADLOCK ***

[  233.469310] 2 locks held by V4L2CaptureThre/5173:
[  233.469312]  #0:  (&gspca_dev->usb_lock){+.+.+.}, at: [<ffffffffa07dd63f>] v4l2_ioctl+0x5f/0xe0 [videodev]
[  233.469317]  #1:  (&gspca_dev->queue_lock){+.+.+.}, at: [<ffffffffa04e4b84>] vidioc_streamon+0x44/0xe0 [gspca_main]
[  233.469321] 
               stack backtrace:
[  233.469324] CPU: 1 PID: 5173 Comm: V4L2CaptureThre Not tainted 4.2.1-300.fc23.x86_64+debug #1
[  233.469326] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F11 08/12/2014
[  233.469327]  0000000000000000 0000000070c5bea1 ffff88062c59b778 ffffffff818682b6
[  233.469330]  0000000000000000 ffffffff82ae02c0 ffff88062c59b7c8 ffffffff811069c3
[  233.469333]  0000000000000000 ffff88062c59b828 0000000000000002 ffff880631fab368
[  233.469336] Call Trace:
[  233.469340]  [<ffffffff818682b6>] dump_stack+0x4c/0x65
[  233.469343]  [<ffffffff811069c3>] print_circular_bug+0x1e3/0x250
[  233.469345]  [<ffffffff81109eb8>] __lock_acquire+0x1a78/0x1d00
[  233.469348]  [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[  233.469351]  [<ffffffff8110aac7>] lock_acquire+0xc7/0x270
[  233.469353]  [<ffffffff812fd0e9>] ? kernfs_remove_by_name_ns+0x49/0xa0
[  233.469355]  [<ffffffff812fc398>] __kernfs_remove+0x288/0x380
[  233.469358]  [<ffffffff812fd0e9>] ? kernfs_remove_by_name_ns+0x49/0xa0
[  233.469360]  [<ffffffff812fb447>] ? kernfs_name_hash+0x17/0xa0
[  233.469362]  [<ffffffff812fbe6c>] ? kernfs_find_ns+0x9c/0x140
[  233.469365]  [<ffffffff812fd0e9>] kernfs_remove_by_name_ns+0x49/0xa0
[  233.469367]  [<ffffffff812feaf5>] sysfs_remove_file_ns+0x15/0x20
[  233.469369]  [<ffffffff81576778>] device_del+0x138/0x270
[  233.469371]  [<ffffffff81107eed>] ? mark_held_locks+0x7d/0xb0
[  233.469373]  [<ffffffff815768d2>] device_unregister+0x22/0x70
[  233.469375]  [<ffffffff81620fb3>] usb_remove_ep_devs+0x23/0x40
[  233.469378]  [<ffffffff81619681>] remove_intf_ep_devs+0x41/0x60
[  233.469380]  [<ffffffff8161a45a>] usb_set_interface+0x19a/0x390
[  233.469382]  [<ffffffff81617998>] ? urb_destroy+0x28/0x30
[  233.469385]  [<ffffffffa04e45c3>] gspca_init_transfer+0x4d3/0xa50 [gspca_main]
[  233.469388]  [<ffffffff81108049>] ? trace_hardirqs_on_caller+0x129/0x1b0
[  233.469390]  [<ffffffffa04e4b84>] ? vidioc_streamon+0x44/0xe0 [gspca_main]
[  233.469393]  [<ffffffffa04e4be0>] vidioc_streamon+0xa0/0xe0 [gspca_main]
[  233.469396]  [<ffffffffa07de95a>] v4l_streamon+0x1a/0x20 [videodev]
[  233.469400]  [<ffffffffa07e223d>] __video_do_ioctl+0x29d/0x310 [videodev]
[  233.469404]  [<ffffffffa07e42c2>] video_usercopy+0x3c2/0x830 [videodev]
[  233.469407]  [<ffffffff81107eed>] ? mark_held_locks+0x7d/0xb0
[  233.469410]  [<ffffffffa07e1fa0>] ? v4l_querycap+0x60/0x60 [videodev]
[  233.469413]  [<ffffffff811080dd>] ? trace_hardirqs_on+0xd/0x10
[  233.469416]  [<ffffffffa07dd63f>] ? v4l2_ioctl+0x5f/0xe0 [videodev]
[  233.469419]  [<ffffffffa07dd63f>] ? v4l2_ioctl+0x5f/0xe0 [videodev]
[  233.469423]  [<ffffffffa07e4745>] video_ioctl2+0x15/0x20 [videodev]
[  233.469426]  [<ffffffffa07dd693>] v4l2_ioctl+0xb3/0xe0 [videodev]
[  233.469428]  [<ffffffff812858ae>] do_vfs_ioctl+0x2ee/0x550
[  233.469431]  [<ffffffff813a09eb>] ? selinux_file_ioctl+0x5b/0xf0
[  233.469433]  [<ffffffff81285b89>] SyS_ioctl+0x79/0x90
[  233.469436]  [<ffffffff81871d6e>] entry_SYSCALL_64_fastpath+0x12/0x76
[  557.672932] kworker/dying (3820) used greatest stack depth: 10168 bytes left
[  902.395125] kworker/dying (126) used greatest stack depth: 9864 bytes left
[ 1101.141470] kworker/dying (140) used greatest stack depth: 9856 bytes left

But abrt not catch this.
Comment 1 Mikhail 2015-09-26 05:27 EDT
Created attachment 1077338 [details]
dmesg
Comment 2 Matej Habrnal 2015-09-29 05:45:57 EDT
Thank you for the bug report!

ABRT didn't catch the crash because a string "[ INFO: possible circular locking dependency detected ]" is not listed in suspicious strings which ABRT uses to find a kernel crashes in log files.

ABRT is not prepared for such a format of crash log as is mentioned above in "Description of problem". If I add the "[ INFO: possible circular locking dependency detected ]" into kernel's suspicious strings, ABRT catch only following:

[ INFO: possible circular locking dependency detected ]
4.2.1-300.fc23.x86_64+debug #1 Not tainted
-------------------------------------------------------
V4L2CaptureThre/5173 is trying to acquire lock:
 (s_active#18){++++.+}, at: [<ffffffff812fd0e9>] kernfs_remove_by_name_ns+0x49/0xa0
               but task is already holding lock:
 (&gspca_dev->queue_lock){+.+.+.}, at: [<ffffffffa04e4b84>] vidioc_streamon+0x44/0xe0 [gspca_main]
               which lock already depends on the new lock.
               the existing dependency chain (in reverse order) is:
               -> #2 (&gspca_dev->queue_lock){+.+.+.}:
       [<ffffffff8110aac7>] lock_acquire+0xc7/0x270
       [<ffffffff8186da6f>] mutex_lock_interruptible_nested+0x7f/0x460
       [<ffffffffa04e37b6>] dev_mmap+0x56/0x250 [gspca_main]
       [<ffffffffa07dd114>] v4l2_mmap+0x54/0x90 [videodev]
       [<ffffffff812248cb>] mmap_region+0x3eb/0x670
       [<ffffffff81224e5f>] do_mmap_pgoff+0x30f/0x3f0
       [<ffffffff81206dbd>] vm_mmap_pgoff+0xad/0xe0
       [<ffffffff81223202>] SyS_mmap_pgoff+0x1f2/0x290
       [<ffffffff81022d2b>] SyS_mmap+0x1b/0x30
       [<ffffffff81871d6e>] entry_SYSCALL_64_fastpath+0x12/0x76

If I add a string "DEADLOCK" into kernel's suspicious strings, ABRT catch and store all the log lines which are located under "*** DEADLOCK ***" string (stack backtrace, Call Trace, ...).

To catch all the information mentioned in "Description of problem" part (from "[ INFO: possible circular locking dependency detected ]" to the end), we must   teach ABRT process such a log format. It is not a trivial and it takes some time.

So I would like to ask, is the information situated under "*** DEADLOCK ***" enough to fix the bug or we must teach ABRT to be able parse all the information (from "[ INFO: possible circular locking dependency detected ]" to the end)?
Comment 3 Anton Arapov 2015-10-16 11:48:12 EDT
Petr, do you have a courage to check this? You can check it with abrt-dump-oops tool from the Abrt. If not - let me know, I will dig into it.
Comment 4 Fedora End Of Life 2016-11-24 07:36:42 EST
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