linux-kernel - Re: [Bug #11264] Invalid op opcode in kernel/workqueue

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Message-ID: <20081007165839.GA24117@codemonkey.org.uk>
Date:	Tue, 7 Oct 2008 12:58:39 -0400
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, oleg@...sign.ru,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Jean-Luc Coulon <jean.luc.coulon@...il.com>,
	venkatesh.pallipadi@...el.com
Subject: Re: [Bug #11264] Invalid op opcode in kernel/workqueue

On Wed, Oct 08, 2008 at 02:23:03AM +1100, Nick Piggin wrote:
 > On Sunday 05 October 2008 04:32, Rafael J. Wysocki wrote:
 > > This message has been generated automatically as a part of a report
 > > of recent regressions.
 > >
 > > The following bug entry is on the current list of known regressions
 > > from 2.6.26.  Please verify if it still should be listed and let me know
 > > (either way).
 > >
 > >
 > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11264
 > > Subject		: Invalid op opcode in kernel/workqueue
 > > Submitter	: Jean-Luc Coulon <jean.luc.coulon@...il.com>
 > > Date		: 2008-08-07 04:18 (59 days old)
 > 
 > Any progress being made with this one? Dave, Oleg did some pretty
 > nice looking debugging work that indicates it might be a cpufreq
 > problem. Have you had a chance to look at the comments in the
 > bugzilla? Or have you been cc'ed on patches for this?

I'm not convinced that the original report wasn't hardware related.
We had taken a machine check exception already, which shows that something
isn't quite right.  MCEs happening under high load are usually a sign
of thermal/power problems of some sort.

Oleg's comments may still hold true, independant of the report.
I've added Venki to the Cc: as he's recently rewritten considerable
amounts of the ondemand governor (though the workqueue mechanics
are pretty much the same).

	Dave

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