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    SubjectRe: 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@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())
    >
    > 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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