Re: 2.6.17-rc4-mm3-lockdep BUG: possible deadlock detected!

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On 29/05/06, Ingo Molnar <mingo@xxxxxxx> wrote:
>
> * Michal Piotrowski <michal.k.k.piotrowski@xxxxxxxxx> wrote:
>
> > I get this with Ingo's lockdep patch from
> > http://people.redhat.com/mingo/generic-irq-subsystem/
>
> sigh, that patchset is not released yet ... it showed up in the genirq
> directory accidentally. (will release it later today)

Ok. So I'll wait with reporting that
http://www.stardust.webpages.pl/files/lockdep/2.6.17-rc4-mm3-lockdep1/lockdep-dmesg2
:)

>
> > ====================================
> > [ BUG: possible deadlock detected! ]
> > ------------------------------------
>
> at first sight this looks like a rare case of nested locking not yet
> covered by the lock validator. Could you try the patch below, to
> correctly express this locking construct to the lock validator?

Problem fixed. Thanks!

>
> Btw., beyond this false positive, i dont see how the lock ordering
> between ports is guaranteed - maybe there's some implicit rule that
> enforces it. And the whole grp->list_lock and grp->list_mutex lock use
> seems quite fragile - using list_lock in atomic contexts and list_mutex
> in schedulable contexts?
>
>         Ingo
>

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)


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