linux-kernel - Re: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: cfq_insert

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Message-ID: <BANLkTinYv+YW6HVCodsWcCKwMmdZFsXPRA@mail.gmail.com>
Date:	Thu, 21 Apr 2011 07:38:57 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Michal Hocko <mhocko@...e.cz>, Jens Axboe <JAxboe@...ionio.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereference
 at 0000000c IP: cfq_insert_request+0x1d/0x3f5

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