linux-kernel - Re: Crashes with 874bbfe600a6 in 3.18.25

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Date:	Thu, 21 Jan 2016 08:29:31 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Jan Kara <jack@...e.cz>, Shaohua Li <shli@...com>
Cc:	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Daniel Bilik <daniel.bilik@...system.cz>
Subject: Re: Crashes with 874bbfe600a6 in 3.18.25

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?

Yup, that's not in. I'll include it and release it along with 3.18.26 on the weekend.


Thanks,
Sasha