linux-kernel - Re: 2.6.32.21 - uptime related crashes?

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Date:	Sun, 15 May 2011 01:13:42 +0200
From:	Nicolas Carlier <chronidev@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	Faidon Liambotis <paravoid@...ian.org>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	seto.hidetoshi@...fujitsu.com,
	Hervé Commowick <hcommowick@...sec.fr>,
	Randy Dunlap <rdunlap@...otime.net>, Greg KH <greg@...ah.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Apollon Oikonomopoulos <apoikos@...il.com>
Subject: Re: 2.6.32.21 - uptime related crashes?

Hi,

On Sat, May 14, 2011 at 10:45 PM, Willy Tarreau <w@....eu> wrote:
> Hi,
>
> On Sat, May 14, 2011 at 09:04:23PM +0200, Nikola Ciprich wrote:
>> Hello gentlemans,
>> Nicolas, thanks for further report, it contradicts my theory that problem occured somewhere during 2.6.32.16.
>
> Well, I'd like to be sure what kernel we're talking about. Nicolas said
> "2.6.32.8 Debian Kernel", but I suspect it's "2.6.32-8something" instead.
> Nicolas, could you please report the exact version as indicated by "uname -a" ?


Sorry, I can't provide more informations on this version because I
don't use it anymore, I can just corrected myself,  it was not a
2.6.32.8 kernel but a 2.6.32.7 backport debian kernel, which had been
recompiled.

Because of this problem I took the oportunity to change to a 2.6.32.26
kernel, however as there was nothing on the changelog or bugzilla
about the resolution of  this issue we have applied the patch found in
bugzilla which revealed this problem:

https://bugzilla.kernel.org/show_bug.cgi?id=16991#c17

>
>> Now I think I know why several of my other machines running 2.6.32.x for long time didn't crashed:
>>
>> I checked bugzilla entry for (I believe the same) problem here:
>> https://bugzilla.kernel.org/show_bug.cgi?id=16991
>> and Peter Zijlstra asked there, whether reporters systems were running some RT tasks. Then I realised that all of my four crashed boxes were pacemaker/corosync clusters and pacemaker uses lots of RT priority tasks. So I believe this is important, and might be reason why other machines seem to be running rock solid - they are not running any RT tasks.
>> It also might help with hunting this bug. Is somebody of You also running some RT priority tasks on inflicted systems, or problem also occured without it?
>
> No, our customer who had two of these boxes crash at the same time was
> not running any RT task to the best of my knowledge.
>

Regards,

--
Nicolas Carlier
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