From: ebiederm@xmission.com (Eric W. Biederman)
To: Nikolay Borisov <n.borisov.lkml@gmail.com>
Cc: containers@lists.linux-foundation.org, jack@suse.cz,
linux-kernel@vger.kernel.org, serge@hallyn.com
Subject: Re: [PATCH v2] inotify: Convert to using per-namespace limits
Date: Fri, 09 Dec 2016 18:38:57 +1300 [thread overview]
Message-ID: <87zik5lkzy.fsf@xmission.com> (raw)
In-Reply-To: <100ecab5-6656-9ed6-c0f4-b9c97eae506a@gmail.com> (Nikolay Borisov's message of "Thu, 8 Dec 2016 10:14:50 +0200")
Nikolay Borisov <n.borisov.lkml@gmail.com> writes:
> On 8.12.2016 08:58, Nikolay Borisov wrote:
>>
>>
>> On 8.12.2016 03:40, Eric W. Biederman wrote:
>>> Nikolay Borisov <kernel@kyup.com> writes:
>>>
>>>> Gentle ping, now that rc1 has shipped and Jan's sysctl concern hopefully
>>>> resolved.
>>>
>>> After getting slowed down by some fixes I am now taking a hard look at
>>> your patch in the hopes of merging it.
>>>
>>> Did you happen to see the kbuild test roboot boot failures and did you
>>> happen to look into what caused them? I have just skimmed them and it
>>> appears to be related to your patch.
>>
>> I saw them in the beginning but they did look like a generic memory
>> corruption and I believe at the time those patches were submitted there
>> was a lingering memory corruption hitting various patches. Thus I didn't
>> think it was related to my patches. I've since left my work so been
>> taking a bit of time off and haven't looked really hard, so those
>> patches have been kind of lingering.
>>
>>
>> But now that you mention it I will try and take a second look to see
>> what might cause the memory corruption? Is there a way to force 0day to
>> re-run them to see whether the failure was indeed caused by my patches
>> or were intermittent?
>
> Ok, I took another look into the report but bear in mind that the
> corruption indeed happened in retire_userns_sysctls. But also this row
> in the report leads me to believe it's not my patch that's the culprit:
>
> [ 65.527277] INFO: Allocated in setup_userns_sysctls+0x3f/0xa6 age=5
> cpu=1 pid=418
> [ 65.558397] INFO: Freed in free_ctx+0x1d/0x20 age=6 cpu=0 pid=19
>
>
> So a free_ctx function did free it originally, likely causing the
> corruption. And there is no such function involved in the code I'm touching.
Yes. I read through your patch carefully and it doesn't look like it
could possibly cause that kind of corruption, the code is just too
simple.
So I have (belatedly) placed this change in linux-next.
Eric
next prev parent reply other threads:[~2016-12-09 5:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-07 10:46 [PATCH] inotify: Convert to using per-namespace limits Nikolay Borisov
2016-10-07 18:14 ` Eric W. Biederman
2016-10-10 6:44 ` Nikolay Borisov
2016-10-10 16:40 ` Jan Kara
2016-10-10 20:49 ` Eric W. Biederman
2016-10-10 21:54 ` Nikolay Borisov
2016-10-10 22:39 ` Eric W. Biederman
2016-10-11 7:36 ` [PATCH v2] " Nikolay Borisov
2016-10-14 2:31 ` [lkp] [inotify] 464e1236c3: BUG kmalloc-512 (Not tainted): Freepointer corrupt kernel test robot
2016-10-24 6:47 ` [PATCH v2] inotify: Convert to using per-namespace limits Nikolay Borisov
2016-10-27 15:46 ` Eric W. Biederman
2016-12-08 1:40 ` Eric W. Biederman
2016-12-08 6:58 ` Nikolay Borisov
2016-12-08 8:14 ` Nikolay Borisov
2016-12-09 5:38 ` Eric W. Biederman [this message]
2016-12-09 2:50 ` Eric W. Biederman
2016-10-24 7:48 ` Jan Kara
2016-11-14 6:04 ` Serge E. Hallyn
2016-10-09 5:55 ` [lkp] [inotify] 1109954e99: BUG kmalloc-512 (Not tainted): Freepointer corrupt kernel test robot
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