Re: INFO: possible circular locking dependency atcleanup_workqueue_thread

[Peter Zijlstra]

On Wed, 2009-05-20 at 15:55 +0200, Oleg Nesterov wrote:
> On 05/20, Peter Zijlstra wrote:
> >
> > On Wed, 2009-05-20 at 15:18 +0200, Oleg Nesterov wrote:
> > > On 05/20, Peter Zijlstra wrote:
> > > >
> > > > Breaking the setup_lock -> cpu_add_remove_lock dependency seems
> > > > sufficient.
> > >
> > > Hmm. What do you mean? Afaics setup_lock -> cpu_add_remove_lock
> > > is not a problem?
> >
> > >From what I could see that is the only dependency that makes
> > cpu_add_remove_lock nest under "events" workqueue 'lock', which is what
> > is generating the deadlock.
> 
> But cpu_add_remove_lock does not participate in this deadlock, see
> http://marc.info/?l=linux-kernel&m=124274977707363 ?
> 
> Perhaps you mean something else, could you spell in that case?

Ah, right, I knew I should have payed more attention when reading the
thread. Yes breaking that chain around dpm_list_mutex would also work,
and solve this other deadlock too.



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