Messages in this thread | | | Subject | Re: 2.6.18-rc1-mm1 | From | Arjan van de Ven <> | Date | Sun, 09 Jul 2006 23:06:24 +0200 |
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On Sun, 2006-07-09 at 03:52 -0700, Andrew Morton wrote: > On Sun, 9 Jul 2006 12:32:27 +0200 > "Michal Piotrowski" <michal.k.k.piotrowski@gmail.com> wrote: > > > Hi, > > > > On 09/07/06, Andrew Morton <akpm@osdl.org> wrote: > > > > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc1/2.6.18-rc1-mm1/ > > > > > > > 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. > > 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.
I think it would be justified to disable lockdep in an oops; after all the kernel state can't really be trusted once that happen....
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