Messages in this thread |  | | | Date | Thu, 21 Apr 2011 09:16:42 +0200 | | From | Michal Hocko <> | | Subject | Re: 2.6.39-rc4 BUG: unable to handle kernel NULL pointer dereference at 0000000c IP: cfq_insert_request+0x1d/0x3f5 |
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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
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