From: Daniel Bilik <daniel.bilik@neosystem.cz>
To: Jan Kara <jack@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
stable@vger.kernel.org
Subject: Re: Crashes with 874bbfe600a6 in 3.18.25
Date: Thu, 4 Feb 2016 17:39:31 +0100 [thread overview]
Message-ID: <20160204173931.4735a8de14fc0bde6c114321@neosystem.cz> (raw)
In-Reply-To: <20160204112044.GE4956@quack.suse.cz>
On Thu, 4 Feb 2016 12:20:44 +0100
Jan Kara <jack@suse.cz> wrote:
> Thanks for backport Thomas and to Mike for persistence :). I've asked my
> friend seeing crashes with 3.18.25 to try whether this patch fixes the
> issues. It may take some time so stay tuned...
Patch tested and it really fixes the crash we were experiencing on 3.18.25
with commit 874bbfe+. But it seem to introduce (rather scary) regression.
Tested host shows abnormal cpu usage in both kernel and userland under the
same load and traffic pattern. One picture is worth a thousand words, so
I've taken snapshots of our graphs, see here:
http://neosystem.cz/test/linux-3.18.25/
The host was running 3.18.25 with commit 874bbfe+ (1e7af29+ on
3.18-stable) reverted. With this commit included, it crashed within
minutes. Around 13:30 we booted 3.18.25 with commit 874bbfe+ included and
with the patch from Thomas. And around 15:40 we've booted the host with
previous kernel, just to ensure this abnormal behaviour was really caused
by the test kernel.
Also interesting, in addition to high cpu usage, there is abnormally high
number of zombie processes reported by the system.
HTH.
--
Daniel Bilik
neosystem.cz
next prev parent reply other threads:[~2016-02-04 16:53 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-20 21:19 Crashes with 874bbfe600a6 in 3.18.25 Jan Kara
2016-01-20 21:39 ` Shaohua Li
2016-01-21 9:52 ` Jan Kara
2016-01-21 13:29 ` Sasha Levin
2016-01-22 1:10 ` Sasha Levin
2016-01-22 16:09 ` Tejun Heo
2016-01-23 2:20 ` Ben Hutchings
2016-01-23 16:11 ` Thomas Gleixner
2016-01-26 9:34 ` Jan Kara
2016-01-26 9:34 ` Jan Kara
2016-01-26 9:49 ` Thomas Gleixner
2016-01-26 9:49 ` Thomas Gleixner
2016-01-26 11:14 ` Petr Mladek
2016-01-26 11:14 ` Petr Mladek
2016-01-26 13:09 ` Thomas Gleixner
2016-01-26 13:09 ` Thomas Gleixner
2016-02-03 9:35 ` Jiri Slaby
2016-02-03 10:41 ` Thomas Gleixner
2016-02-03 12:28 ` Michal Hocko
2016-02-03 16:24 ` Tejun Heo
2016-02-03 16:48 ` Michal Hocko
2016-02-03 16:59 ` Tejun Heo
2016-02-04 6:37 ` Michal Hocko
2016-02-04 7:40 ` Michal Hocko
2016-02-03 17:01 ` Mike Galbraith
2016-02-03 17:06 ` Tejun Heo
2016-02-03 17:13 ` Mike Galbraith
2016-02-03 17:15 ` Tejun Heo
2016-02-04 2:00 ` Mike Galbraith
2016-02-05 16:49 ` Tejun Heo
2016-02-05 20:47 ` Mike Galbraith
2016-02-05 20:54 ` Tejun Heo
2016-02-05 20:59 ` Mike Galbraith
2016-02-05 21:06 ` Tejun Heo
2016-02-06 13:07 ` Henrique de Moraes Holschuh
2016-02-07 5:19 ` Mike Galbraith
2016-02-07 5:59 ` Mike Galbraith
2016-02-09 15:31 ` Mike Galbraith
2016-02-09 16:39 ` Linus Torvalds
2016-02-09 16:50 ` Tejun Heo
2016-02-09 17:04 ` Mike Galbraith
2016-02-09 17:54 ` Tejun Heo
2016-02-09 17:56 ` Mike Galbraith
2016-02-09 18:02 ` Mike Galbraith
2016-02-09 18:27 ` Tejun Heo
2016-02-09 17:04 ` Linus Torvalds
2016-02-09 17:51 ` Tejun Heo
2016-02-09 18:06 ` Linus Torvalds
2016-02-04 10:04 ` Mike Galbraith
2016-02-04 10:46 ` Thomas Gleixner
2016-02-04 11:07 ` Mike Galbraith
2016-02-04 11:20 ` Jan Kara
2016-02-04 16:39 ` Daniel Bilik [this message]
2016-02-05 2:40 ` Mike Galbraith
2016-02-05 8:11 ` Daniel Bilik
2016-02-05 8:33 ` Mike Galbraith
2016-02-03 18:46 ` Thomas Gleixner
2016-02-03 19:01 ` Tejun Heo
2016-02-03 19:05 ` Thomas Gleixner
2016-02-03 19:15 ` Tejun Heo
2016-02-05 5:44 ` Mike Galbraith
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