Re: Crashes with 874bbfe600a6 in 3.18.25

From	Sasha Levin <sasha.levin@oracle.com>
Newsgroups	linux.kernel
Subject	Re: Crashes with 874bbfe600a6 in 3.18.25
Date	2016-01-22 02:20 +0100
Message-ID	<qTyym-55a-13@gated-at.bofh.it> (permalink)
References	<qT8ky-3HK-3@gated-at.bofh.it> <qT8DT-3Q7-1@gated-at.bofh.it> <qTkc2-3tc-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 01/21/2016 04:52 AM, Jan Kara wrote:
> On Wed 20-01-16 13:39:01, Shaohua Li wrote:
>> On Wed, Jan 20, 2016 at 10:19:26PM +0100, Jan Kara wrote:
>>> Hello,
>>>
>>> a friend of mine started seeing crashes with 3.18.25 kernel - once
>>> appropriate load is put on the machine it crashes within minutes. He
>>> tracked down that reverting commit 874bbfe600a6 (this is the commit ID from
>>> Linus' tree, in stable tree the commit ID is 1e7af294dd03) "workqueue: make
>>> sure delayed work run in local cpu" makes the kernel stable again. I'm
>>> attaching screenshot of the crash - sadly the initial part is missing but
>>> it seems that we crashed when processing timers on otherwise idle CPU. This
>>> is a production machine so experimentation is not easy but if we really
>>> need more information it may be possible to reproduce the issue again and
>>> gather it.
>>>
>>> Anyone has idea what is going on? I was looking into the code for a while
>>> but so far I have no good explanation.  It would be good to understand the
>>> cause instead of just blindly reverting the commit from stable tree...
>>
>> Tejun fixed a bug in timer: 22b886dd10180939. is it included in 3.18.25?
> 
> That doesn't seem to be included in 3.18-stable although it was CCed to stable.
> Sasha?

Looks like it requires more than trivial backport (I think). Tejun?


Thanks,
Sasha

Thread

Crashes with 874bbfe600a6 in 3.18.25 Jan Kara <jack@suse.cz> - 2016-01-20 22:20 +0100
  Re: Crashes with 874bbfe600a6 in 3.18.25 Shaohua Li <shli@fb.com> - 2016-01-20 22:40 +0100
    Re: Crashes with 874bbfe600a6 in 3.18.25 Jan Kara <jack@suse.cz> - 2016-01-21 11:00 +0100
      Re: Crashes with 874bbfe600a6 in 3.18.25 Sasha Levin <sasha.levin@oracle.com> - 2016-01-21 14:40 +0100
      Re: Crashes with 874bbfe600a6 in 3.18.25 Sasha Levin <sasha.levin@oracle.com> - 2016-01-22 02:20 +0100
        Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-01-22 17:10 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Ben Hutchings <ben@decadent.org.uk> - 2016-01-23 03:30 +0100
            Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-01-23 17:20 +0100
              Re: Crashes with 874bbfe600a6 in 3.18.25 Jan Kara <jack@suse.cz> - 2016-01-26 10:40 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-01-26 11:00 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Petr Mladek <pmladek@suse.com> - 2016-01-26 12:20 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-01-26 14:20 +0100

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