Re: Crashes with 874bbfe600a6 in 3.18.25

From	Daniel Bilik <daniel.bilik@neosystem.cz>
Newsgroups	linux.kernel
Subject	Re: Crashes with 874bbfe600a6 in 3.18.25
Date	2016-02-05 09:20 +0100
Message-ID	<qYJMu-64X-3@gated-at.bofh.it> (permalink)
References	(8 earlier) <qYp1n-7ay-1@gated-at.bofh.it> <qYpE8-7qG-55@gated-at.bofh.it> <qYqgN-7X3-3@gated-at.bofh.it> <qYvqb-4Ad-21@gated-at.bofh.it> <qYED8-2lp-19@gated-at.bofh.it>
Organization	neosystem.cz

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On Fri, 05 Feb 2016 03:40:46 +0100
Mike Galbraith <umgwanakikbuti@gmail.com> wrote:

> On Thu, 2016-02-04 at 17:39 +0100, Daniel Bilik wrote:
> > 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.
> 
> IMHO you should restore the CC list and re-post.  (If I were the
> maintainer of either the workqueue code or 3.18-stable, I'd be highly
> interested in this finding).

Sorry, I haven't realized tha patch proposed by Thomas is already on its
way to stable. CC restored and re-posting.

--
						Daniel Bilik
						neosystem.cz

Thread

Re: Crashes with 874bbfe600a6 in 3.18.25 Jiri Slaby <jslaby@suse.cz> - 2016-02-03 10:40 +0100
  Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-02-03 11:50 +0100
  Re: Crashes with 874bbfe600a6 in 3.18.25 Michal Hocko <mhocko@kernel.org> - 2016-02-03 13:30 +0100
    Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-03 17:30 +0100
      Re: Crashes with 874bbfe600a6 in 3.18.25 Michal Hocko <mhocko@kernel.org> - 2016-02-03 17:50 +0100
        Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-03 18:10 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Michal Hocko <mhocko@kernel.org> - 2016-02-04 07:40 +0100
            Re: Crashes with 874bbfe600a6 in 3.18.25 Michal Hocko <mhocko@kernel.org> - 2016-02-04 08:50 +0100
      Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-03 18:10 +0100
        Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-03 18:10 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-03 18:20 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-03 18:20 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-04 03:10 +0100
            Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-05 17:50 +0100
              Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-05 21:50 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-05 22:00 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-05 22:10 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Henrique de Moraes Holschuh <hmh@hmh.eng.br> - 2016-02-06 14:10 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-07 06:30 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-07 07:10 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-05 22:10 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-04 11:10 +0100
            Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-02-04 11:50 +0100
              Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-04 12:10 +0100
              Re: Crashes with 874bbfe600a6 in 3.18.25 Jan Kara <jack@suse.cz> - 2016-02-04 12:30 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Daniel Bilik <daniel.bilik@neosystem.cz> - 2016-02-04 18:00 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-05 03:50 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Daniel Bilik <daniel.bilik@neosystem.cz> - 2016-02-05 09:20 +0100
                Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-05 09:40 +0100
      Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-02-03 19:50 +0100
        Re: Crashes with 874bbfe600a6 in 3.18.25 Thomas Gleixner <tglx@linutronix.de> - 2016-02-03 20:10 +0100
          Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-03 20:20 +0100
        Re: Crashes with 874bbfe600a6 in 3.18.25 Tejun Heo <tj@kernel.org> - 2016-02-03 20:10 +0100
      Re: Crashes with 874bbfe600a6 in 3.18.25 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-02-05 06:50 +0100

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