On Tue, 16 Oct 2007 11:05:12 +0200 Peter Zijlstra <[email protected]> wrote:
> On Tue, 2007-10-16 at 02:01 -0700, Andrew Morton wrote:
> > On Tue, 16 Oct 2007 12:54:29 +0400 Alexey Dobriyan <[email protected]> wrote:
> >
> > > Got this during LTP's diotest1. Reproducable.
> > >
> > > =======================================================
> > > [ INFO: possible circular locking dependency detected ]
> > > 2.6.23-65a6ec0d72a07f16719e9b7a96e1c4bae044b591 #2
> > > -------------------------------------------------------
> > > diotest1/13563 is trying to acquire lock:
> > > (&mm->mmap_sem){----}, at: [<c107a7b7>] dio_get_page+0x4b/0x16b
> > >
> > > but task is already holding lock:
> > > (jbd_handle){--..}, at: [<c1099b05>] journal_start+0xf3/0x120
> > >
> > > which lock already depends on the new lock.
> >
> > Someone taught lockdep about journal_start? That's gonna hurt.
>
> It was you who suggested doing so,...
yeah, but I didn't think anyone would go and do it!
> Are these valid reports, or is the annotation wrong?
It's valid. There will be others..
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