Kernel oops+crash on repeated auditd restarts

Wed Mar 28 22:42:37 UTC 2012

fyi: this patch [1] seems to fix the issue for me. The explanation in
the subject would reliably oops my machine.

[1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fed474857efbed79cd390d0aee224231ca718f63

On Wed, Mar 28, 2012 at 1:51 PM, Peter Moody <pmoody at google.com> wrote:
> Are you still able to reliably reproduce this oops? I'm trying to
> track this down because this bug (or a very similar bug) is causing
> some significant headaches here at work, but I haven't had a lot of
> luck. I'm using usermode linux, though, so that might be interfering
> with things.
>
> On Mon, Mar 5, 2012 at 12:35 AM, Valentin Avram <aval13 at gmail.com> wrote:
>> Finally i found some time and spare server to retest the oops and list_add
>> corruptions i was getting with the 3.x kernels and auditd 2.1.3.
>>
>> I tested now with gentoo's latest stable 3.2.1-gentoo-r2 and kernel.org's
>> 3.2.9.
>>
>> Both get the oops/BUG in the same way and after that, they keep pouring
>> list_add corruptions with audit_prune_tre(truncated?) and auditctl as comms.
>>
>> Since this is not about Gentoo's kernel only, i'll post here the oops in
>> 3.2.9 and also attach some list_add corruptions.
>>
>> 3.2.9 BUG:
>>
>> kernel: [  301.240011] BUG: unable to handle kernel NULL pointer dereference
>> at   (null)
>> kernel: [  301.240305] IP: [<c1238dd0>] __list_del_entry+0x20/0xe0
>> kernel: [  301.240481] *pdpt = 0000000000000000 *pde = f000ddc8f000ddc8
>> kernel: [  301.240698] Oops: 0000 [#1] SMP
>> kernel: [  301.240910]
>> kernel: [  301.241030] Pid: 642, comm: fsnotify_mark Not tainted
>> 3.2.9-drbd-version3 #1 Dell Inc. PowerEdge 2950/0CX396
>> kernel: [  301.241370] EIP: 0060:[<c1238dd0>] EFLAGS: 00010287 CPU: 6
>> kernel: [  301.241498] EIP is at __list_del_entry+0x20/0xe0
>> kernel: [  301.241623] EAX: f4fae544 EBX: f47cffa4 ECX: ffffffff EDX:
>> 00000000
>> kernel: [  301.241751] ESI: f4fae544 EDI: f4fae508 EBP: f47cff7c ESP:
>> f47cff64
>> kernel: [  301.241879]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
>> kernel: [  301.242005] Process fsnotify_mark (pid: 642, ti=f47ce000
>> task=f4f47c00 task.ti=f47ce000)
>> kernel: [  301.242207] Stack:
>> kernel: [  301.242327]  c10813c0 f47cffa4 f4f47c00 f4e70888 f47cff7c
>> f47cffa4 f47cffb8 c10f6976
>> kernel: [  301.242882]  ffffffc3 f4f47c00 f4f47c00 00000000 f4f47c00
>> c10530c0 f47cff9c f47cff9c
>> kernel: [  301.243438]  f4fae544 f4fae544 f4c47f58 00000000 c10f68f0
>> f47cffe4 c1052834 00000000
>> kernel: [  301.243995] Call Trace:
>> kernel: [  301.244119]  [<c10813c0>] ? rcu_check_callbacks+0x110/0x110
>> kernel: [  301.244248]  [<c10f6976>] fsnotify_mark_destroy+0x86/0x120
>> kernel: [  301.244377]  [<c10530c0>] ? abort_exclusive_wait+0x80/0x80
>> kernel: [  301.244504]  [<c10f68f0>] ? fsnotify_put_mark+0x30/0x30
>> kernel: [  301.244631]  [<c1052834>] kthread+0x74/0x80
>> kernel: [  301.244756]  [<c10527c0>] ? kthread_flush_work_fn+0x10/0x10
>> kernel: [  301.244885]  [<c1582ab6>] kernel_thread_helper+0x6/0xd
>> kernel: [  301.245011] Code: 55 f4 8b 45 f8 e9 75 ff ff ff 90 55 89 e5 53 83
>> ec 14 8b 08 8b 50 04 81 f9 00 01 10 00 74 24 81 fa 00 02 20 00 0f 84 8e 00
>> 00 00 <8b> 1a 39 d8 75 62 8b 59 04 39 d8 75 35 89 51 04 89 0a 83 c4 14
>> kernel: [  301.248195] EIP: [<c1238dd0>] __list_del_entry+0x20/0xe0 SS:ESP
>> 0068:f47cff64
>> kernel: [  301.248414] CR2: 0000000000000000
>> kernel: [  301.248538] ---[ end trace 15082dbfb353f84c ]---
>>
>> The kernel was compiled with the following DEBUG support (the bolded one
>> were requested by Gentoo's Dev:
>> CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
>> CONFIG_SLUB_DEBUG=y
>> CONFIG_HAVE_DMA_API_DEBUG=y
>> CONFIG_X86_DEBUGCTLMSR=y
>> CONFIG_PNP_DEBUG_MESSAGES=y
>> CONFIG_AIC94XX_DEBUG=y
>> CONFIG_USB_DEBUG=y
>> CONFIG_DEBUG_KERNEL=y
>> CONFIG_SCHED_DEBUG=y
>> CONFIG_DEBUG_RT_MUTEXES=y
>> CONFIG_DEBUG_PI_LIST=y
>> CONFIG_DEBUG_BUGVERBOSE=y
>> CONFIG_DEBUG_INFO=y
>> CONFIG_DEBUG_MEMORY_INIT=y
>> CONFIG_DEBUG_LIST=y
>> CONFIG_DEBUG_STACKOVERFLOW=y
>> CONFIG_DEBUG_RODATA=y
>> CONFIG_DEBUG_RODATA_TEST=y
>>
>> I attached the kernel config i used for 3.2.9 to generate this oops and
>> warnings.
>>
>> From the list_add warnings that come after, out of 805 warnings i processed,
>> after masking with XXXXX the PID and next= values that kept changing in
>> every one, i got 26 types of MD5. I also attached the files relevant as an
>> archive to this email.
>>
>> The Gentoo bug i opened is sleeping, it seems nobody has the time to at
>> least test to confirm or not the problems i'm seeing (or everybody's
>> thinking that nobody would restart auditd so often, so the bug it's not that
>> serious).
>>
>>
>> Thank you for your time.
>>
>> On Wed, Feb 8, 2012 at 6:11 PM, Valentin Avram <aval13 at gmail.com> wrote:
>>
>>
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>> Linux-audit at redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-audit
>
>
>
> --
> Peter Moody      Google    1.650.253.7306
> Security Engineer  pgp:0xC3410038

-- 
Peter Moody      Google    1.650.253.7306
Security Engineer  pgp:0xC3410038