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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 17 Feb 2011 11:11:51 -0800
Message-ID: <AANLkTinB=EgDGNv-v-qD-MvHVAmstfP_CyyLNhhotkZx@mail.gmail.com>
Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in 2.6.38-rc4
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>, Michal Hocko <mhocko@suse.cz>,
        linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
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On Thu, Feb 17, 2011 at 10:57 AM, Eric W. Biederman
<ebiederm@xmission.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())

                      Linus
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