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    SubjectRe: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: cfq_insert_request+0x1d/0x3f5
    On Thu 21-04-11 07:38:57, Linus Torvalds wrote:
    > On Thu, Apr 21, 2011 at 12:25 AM, Jens Axboe <> wrote:
    > >>
    > >> I am going to bisect, let's see if I can find anything.
    > >
    > > Thanks, that would be great!
    > I'd expect it to be very timing-dependent, and thus could easily be
    > triggered (or hidden) by unrelated changes.
    > Just happening to have a request added to the elevator at _just_ the
    > same moment that another CPU is changing it and getting rid of the
    > data structures for the old one.

    And it really looks like a timing issue. I have bisected down to
    e710d7d5a9cab1041b7a3cf9e655b75d92786857. I had to skip[1] some commits
    due to compile errors [2].
    At first it looked quite promising because I was able to boot after I
    reverted that patch but then I have tried to revert it on top of rc4
    (2f666bcf757cb72549f360ef6da02f03620a48b6) and saw the same problem

    So I do not think that bisecting will help here.

    [1] git bisect log
    git bisect start
    # bad: [2f666bcf757cb72549f360ef6da02f03620a48b6] Merge branch 'drm-fixes' of git://
    git bisect bad 2f666bcf757cb72549f360ef6da02f03620a48b6
    # good: [a6360dd37e1a144ed11e6548371bade559a1e4df] Linux 2.6.39-rc3
    git bisect good a6360dd37e1a144ed11e6548371bade559a1e4df
    # bad: [fdfc552abe2c465ab91b84fb65f36d86c6737ab4] Merge branches 'core-fixes-for-linus', 'perf-fixes-for-linus', 'sched-fixes-for-linus', 'timer-fixes-for-linus' and 'x86-fixes-for-linus' of git://
    git bisect bad fdfc552abe2c465ab91b84fb65f36d86c6737ab4
    # bad: [01eda2e0c0cf035308308a19581e4979285b51ec] kstrtox: fix compile warnings in test
    git bisect bad 01eda2e0c0cf035308308a19581e4979285b51ec
    # bad: [aaa119a3d4e0b7421c82ae3fbe288e65d0f3485f] Merge branch 'for-linus' of git://
    git bisect bad aaa119a3d4e0b7421c82ae3fbe288e65d0f3485f
    # bad: [d77d9597ad8f2bd381a5168005a21e82df6f18eb] Merge branch 'for_linus' of git://
    git bisect bad d77d9597ad8f2bd381a5168005a21e82df6f18eb
    # good: [08a0799d5736f1494ef35d386570d177447acbfb] acer-wmi: Fix capitalisation of GUID in module alias
    git bisect good 08a0799d5736f1494ef35d386570d177447acbfb
    # skip: [be85bccaa5aa5a11dcaf85f9e945ffefd253f631] Revert "vfs: Export file system uuid via /proc/<pid>/mountinfo"
    git bisect skip be85bccaa5aa5a11dcaf85f9e945ffefd253f631
    # skip: [95042f9eb78a8d9a17455e2ef263f2f310ecef15] vm: fix mlock() on stack guard page
    git bisect skip 95042f9eb78a8d9a17455e2ef263f2f310ecef15
    # bad: [0bba01695b74fdd2f9286243bb39f88544d81401] vfs: Re-introduce s_uuid in the superblock
    git bisect bad 0bba01695b74fdd2f9286243bb39f88544d81401
    # good: [16ad56972ca3161eb97583897f17c1ead0c4ebd0] Merge branch 'stable/bug-fixes-rc2' of git://
    git bisect good 16ad56972ca3161eb97583897f17c1ead0c4ebd0
    # skip: [0d88f6e804c824454b5ed0d3034ed3dcf7467a87] nfs: don't call __mark_inode_dirty while holding i_lock
    git bisect skip 0d88f6e804c824454b5ed0d3034ed3dcf7467a87
    # skip: [e328f05dd6c528fcc9eb6da157dd865dfe611352] Merge branch 'for-linus' of git://
    git bisect skip e328f05dd6c528fcc9eb6da157dd865dfe611352
    # bad: [e710d7d5a9cab1041b7a3cf9e655b75d92786857] mfd: Fetch cell pointer from platform_device->mfd_cell
    git bisect bad e710d7d5a9cab1041b7a3cf9e655b75d92786857

    fs/ext3/super.c: In function 'ext3_fill_super':
    fs/ext3/super.c:1946:2: error: 'struct super_block' has no member named 's_uuid'
    Michal Hocko
    SUSE Labs
    SUSE LINUX s.r.o.
    Lihovarska 1060/12
    190 00 Praha 9
    Czech Republic

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