From: Linus Torvalds <torvalds@linux-foundation.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Michal Hocko <mhocko@suse.cz>, Jens Axboe <JAxboe@fusionio.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: cfq_insert_request+0x1d/0x3f5
Date: Thu, 21 Apr 2011 07:38:57 -0700 [thread overview]
Message-ID: <BANLkTinYv+YW6HVCodsWcCKwMmdZFsXPRA@mail.gmail.com> (raw)
In-Reply-To: <5F35AAD2-8277-44BD-86B6-B1D7B816071E@kernel.dk>
On Thu, Apr 21, 2011 at 12:25 AM, Jens Axboe <axboe@kernel.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
next prev parent reply other threads:[~2011-04-21 14:39 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-20 12:58 Michal Hocko
2011-04-20 13:03 ` Jens Axboe
2011-04-20 13:13 ` Jens Axboe
2011-04-20 13:29 ` Michal Hocko
2011-04-20 13:31 ` Jens Axboe
2011-04-20 17:33 ` Jens Axboe
2011-04-21 7:16 ` Michal Hocko
2011-04-21 7:25 ` Jens Axboe
2011-04-21 14:38 ` Linus Torvalds [this message]
2011-04-21 15:29 ` Jens Axboe
2011-04-21 18:52 ` Michal Hocko
2011-04-21 18:51 ` Michal Hocko
2011-04-21 19:00 ` Jens Axboe
2011-04-22 7:00 ` Michal Hocko
2011-04-22 11:35 ` Jens Axboe
2011-04-22 20:30 ` Hugh Dickins
2011-04-21 15:04 ` Jeff Moyer
2011-04-21 15:27 ` Vivek Goyal
2011-04-21 15:51 ` Jeff Moyer
2011-04-21 15:30 ` Jens Axboe
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