From: Michal Hocko <mhocko@suse.cz>
To: Jens Axboe <jaxboe@fusionio.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
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 09:16:42 +0200 [thread overview]
Message-ID: <20110421071642.GA3556@tiehlicka.suse.cz> (raw)
In-Reply-To: <4DAF18DF.9080205@fusionio.com>
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.
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
next prev parent reply other threads:[~2011-04-21 7:16 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 [this message]
2011-04-21 7:25 ` Jens Axboe
2011-04-21 14:38 ` Linus Torvalds
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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