Re: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereferenceat 0000000c IP: cfq_insert_request+0x1d/0x3f5

[Linus Torvalds]

On Thu, Apr 21, 2011 at 12:25 AM, Jens Axboe <axboe@xxxxxxxxx> 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.

        Linus
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