linux-kernel - Re: BUG: Bad page map in process udevd (anon

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Date:	Fri, 18 Feb 2011 17:26:24 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in
 2.6.38-rc4

On Fri 18-02-11 13:29:38, Michal Hocko wrote:
> On Thu 17-02-11 11:11:51, Linus Torvalds wrote:
> > On Thu, Feb 17, 2011 at 10:57 AM, Eric W. Biederman
> > <ebiederm@...ssion.com> wrote:
> > >
> > > fedora 14
> > > ext4 on all filesystems
> > 
> > Your dmesg snippets had ext3 mentioned, though:
> > 
> >   <6>EXT3-fs (sda1): recovery required on readonly filesystem
> >   <6>EXT3-fs (sda1): write access will be enabled during recovery
> >   <6>EXT3-fs: barriers not enabled
> >   ..
> >   <6>EXT3-fs (sda1): recovery complete
> >   <6>EXT3-fs (sda1): mounted filesystem with ordered data mode
> >   <6>dracut: Mounted root filesystem /dev/sda1
> > 
> > not that I see that it should matter, but there's been some bigger
> > ext3 changes too (like the batched discard).
> > 
> > I don't really think ext3 is the issue, though.
> > 
> > > I was about to say this happens with DEBUG_PAGEALLOC enabled but it
> > > appears that options keeps eluding my fingers when I have a few minutes
> > > to play with it. ?Perhaps this time will be the charm.
> > 
> > Please do. You seem to be much better at triggering it than anybody
> > else. And do the DEBUG_LIST and DEBUG_SLUB_ON things too (even if the
> > DEBUG_LIST thing won't catch list_move())
> 
> I was able to reproduce (now it fired into dcopserver) with the
> following simple test case:
> 
> while true
> do
> 	rmmod iwl3945 iwlcore mac80211 cfg80211
> 	sleep 2
> 	modprobe iwl3945
> done
> 
> Now, I will try with the 2 patches patches in this thread. I will also
> turn on DEBUG_LIST and DEBUG_PAGEALLOC.

I am not able to reproduce with those 2 patches applied.

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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