linux-kernel - Re: Random panic in load

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Message-ID: <20140725094258.GB295@x4>
Date:	Fri, 25 Jul 2014 11:42:58 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Michel Dänzer <michel@...nzer.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jakub Jelinek <jakub@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Random panic in load_balance() with 3.16-rc

On 2014.07.25 at 11:21 +0200, Markus Trippelsdorf wrote:
> On 2014.07.25 at 18:03 +0900, Michel Dänzer wrote:
> > On 25.07.2014 17:15, Linus Torvalds wrote:
> > > On Thu, Jul 24, 2014 at 11:48 PM, Jakub Jelinek <jakub@...hat.com> wrote:
> > >>
> > >> Can I ask anyone involved in this for preprocessed source and all gcc command
> > >> line options to reproduce it, best in the form of a http://gcc.gnu.org/bugzilla/
> > >> bugreport?
> > > 
> > > I've created bug 61904 for this:
> > > 
> > >   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61904
> > > 
> > > Note that I don't personally have a reproducer (my machine has
> > > gcc-4.8.3, and I don't see the same behavior), but I included the
> > > incorrect fair.s file that Michel sent me (which has all the command
> > > line options in it), and a pre-processed "fair.i" source file that I
> > > generated and that *should* match the configuration that was the
> > > source for that result. So there might be some version/configuration
> > > skew there between the two files, but I think they match.
> > 
> > Thank you Linus for tracking down the problem and filing the bug report!
> > I would have done the latter as well, but I could only have channeled
> > your analysis anyway. :)
> > 
> > 
> > > Holler if you cannot reproduce the problem based on that.
> > 
> > Likewise. I can create a GCC bugzilla account and add myself to the CC
> > list if that helps.
> > 
> > FWIW though, the fair.i file you attached is basically identical to what
> > I'm getting, the only difference being a handful of file path strings.
> 
> Unfortunately I cannot reproduce the issue. Please post your complete
> compiler invocation while also adding -v to the options.

The bug only happens for CONFIG_DEBUG_INFO !CONFIG_DEBUG_INFO_REDUCED
configurations. 

-- 
Markus
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