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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
    Date
    On 21/04/2011, at 09.16, Michal Hocko <mhocko@suse.cz> wrote:

    > On Wed 20-04-11 19:33:19, Jens Axboe wrote:
    >> On 2011-04-20 15:29, Michal Hocko wrote:
    >>> On Wed 20-04-11 15:13:15, Jens Axboe wrote:
    >>>> On 2011-04-20 14:58, Michal Hocko wrote:
    > [...]
    >>>>> [ 31.207888] Oops: 0000 [#1] PREEMPT [ 31.208186] last sysfs file: /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/queue/scheduler
    >>>>
    >>>> Ahh hang on, this may be a good clue. Does your boot scripts change the
    >>>> IO scheduler?
    >>>
    >>> Good one...
    >>> Yes, I have:
    >>> echo deadline > /sys/block/sda/queue/scheduler
    >>> in /etc/rc.local
    >>>
    >>> I am able to boot after I remove it. This is the first time I have seen
    >>> "last sysfs file" being useful.
    >>> Still want me to test the patch from the other email?
    >>
    >> Is this a new addition to your system? IOW, how certain are you that
    >> this is a regression that occured between rc3 and rc4?
    >
    > No, I am setting the scheduler this way for quite some time. If I use it
    > rc4 explodes while rc3 boots just fine. I am wondering, can this be a
    > timing issue? I am able to set the scheduler after system settles down
    > after boot and kde starts.
    >
    > I am going to bisect, let's see if I can find anything.

    Thanks, that would be great!

    Jens



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