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

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Date:	Mon, 16 May 2011 01:56:54 +0300
From:	Faidon Liambotis <paravoid@...ian.org>
To:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
Cc:	Willy Tarreau <w@....eu>, 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>, chronidev@...il.com
Subject: Re: 2.6.32.21 - uptime related crashes?

On Sat, May 14, 2011 at 09:04:23PM +0200, Nikola Ciprich wrote:
> Nicolas, thanks for further report, it contradicts my theory that
> problem occured somewhere during 2.6.32.16.  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

I don't think that that bug is related, I for one haven't seen any
backtrace that is similar to the above or relevant to divide by zero.

> 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, no RT tasks here. The boxes in my case were just running a lot of
kvm processes.

Regards,
Faidon
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