Hi Ingo,
On 10/07/06, Ingo Molnar <[email protected]> wrote:
* Andrew Morton <[email protected]> wrote:
> > This looks like a problem with cpufreq.
> >
> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > -------------------------------------------------------
> > cpuspeed/1426 is trying to acquire lock:
> > (&inode->i_data.tree_lock){.+..}, at: [<c0151dc7>] find_get_page+0x12/0x70
> >
> > but task is already holding lock:
> > (&mm->mmap_sem){----}, at: [<c0116cab>] do_page_fault+0x10d/0x4ea
> >
> > which lock already depends on the new lock.
> >
>
> rofl. You broke lockdep.
ouch! the lock identifications look quite funny :-| Never saw that
happen before,
:)
i'm wondering what's going on. Michal, did this happen
straight during bootup? Or did you remove/recompile/reinsert any modules
perhaps?
It's happening while /etc/init.d/cpuspeed execution.
I forgot about "make O=/dir/ clean". When new -mm is out I always
remove kernel directory and create new one.
> Well. I guess it's barely conceivable that you earlier took an oops
> while holding tree_lock, so lockdep decided that mmap_sem nests inside
> tree_lock.
Arjan is preparing a patch to turn off lockdep when we crash. Although i
dont see any trace of an earlier oops in the dmesg.
Ingo
Regards,
Michal
--
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)
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