linux-kernel - Re: Hard lockups using 3.10.0

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Date:	Thu, 11 Jul 2013 12:16:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Rolf Eike Beer <eike-kernel@...tec.de>,
	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: Hard lockups using 3.10.0

On Thu, Jul 11, 2013 at 12:07:21PM +0200, Borislav Petkov wrote:
> On Thu, Jul 11, 2013 at 11:38:37AM +0200, Rolf Eike Beer wrote:
> > Hi,
> > 
> > I'm running 3.10.0 (from openSUSE packages) on an "Intel(R) Core(TM) i7-2600 
> > CPU @ 3.40GHz". I got a hard lockup on one of my CPUs twice, once with 
> > backtrace (see attached image). Graphics is the builtin Intel, used with X 7.6 
> > and KDE 4.10beta2 (basically current openSUSE 12.3+KDE).
> > 
> > I'm not aware that I had done anything special, just "normal" desktop and 
> > development usage, but no heavy compile work at the moment the lockups 
> > happened.
> 
> Hmm, I can see commit_creds() doing some rcu pointers assignment and rcu
> calling into the scheduler which screams about a cpu runqueue of the
> task we're about to reschedule not being locked. Let's add some more
> people who should know better.

-ENOIMAGE
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