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    SubjectRe: 2.6.18-rc1-mm1
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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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