linux-kernel - Re: 2.6.34-rc2 - crash on shutdown

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Date:	Tue, 23 Mar 2010 23:18:11 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	Stephane Eranian <eranian@...gle.com>,
	David R <david@...olicited.net>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.34-rc2 - crash on shutdown

On Tuesday 23 March 2010, Clemens Ladisch wrote:
> Stephane Eranian wrote:
> > On Tue, Mar 23, 2010 at 1:02 PM, Clemens Ladisch <clemens@...isch.de> wrote:
> > > The only pointer access in this function is cpuhw->amd_nb, but
> > > I don't see any obvious bugs.
> > 
> > I reported a problem with the AMD initialization just last week.
> > There is an issue with amd_pmu_cpu_online() which gets called
> > too early, and thus fails. That leaves some bogus state and causes
> > a crash in amd_pmu_cpu_offline().
> > 
> > I proposed a fix which was rejected. The alternative involves moving
> > some the of CPU initialization code (on AMD) to an earlier position,i.e.,
> > which would be executed before the CPU_STARTED notifier. Nobody
> > has proposed anything else so far.
> 
> I don't know about the early bootmem stuff, but regardless of this issue,
> if amd_pmu_cpu_online() can fail, then amd_pmu_cpu_offline() must be able
> to handle this without blowing up.  Something like this (untested):

I guess we handle that already:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a90110c61073eab95d1986322693c2b9a8a6a5f6

Rafael
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