linux-kernel - Re: perf bug: bad page map

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Message-ID: <20131118230553.32c478df@alan.etchedpixels.co.uk>
Date:	Mon, 18 Nov 2013 23:05:53 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	tytso@....edu, adilger.kernel@...ger.ca
Subject: Re: perf bug: bad page map

On Mon, 18 Nov 2013 11:41:22 -0500 (EST)
Vince Weaver <vincent.weaver@...ne.edu> wrote:

> On Mon, 18 Nov 2013, Peter Zijlstra wrote:
> 
> > On Fri, Nov 15, 2013 at 01:04:23PM -0500, Vince Weaver wrote:
> > > 
> > > (figured out the minicom issue).
> > > 
> > > Anyway while trying to reproduce the last bug I instead got this with
> > > the perf_fuzzer.
> > > 
> > > Is it worth continuing to run and report these issues?  I'm losing track 
> > > of all the open bugs.
> > 
> > This is looks like ext4. Not entirely sure how perf ties into this.
> 
> It's believable the filesystem could have issues (it's a fuzzer machine, 
> so it's had 100+ unclean shutdowns on an SSD drive in the past few months)
> but as far as I know there shouldn't have been any filesystem accesses 
> happening at all when the bug triggered.

Obvious question - does it pass fsck currently. If it does then
presumably it was sane at the time it went pop ?
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