Re: rcu_prempt stalls / lockup

[Paul E. McKenney]

On Tue, Apr 01, 2014 at 11:32:45AM -0700, Paul E. McKenney wrote:
> On Tue, Apr 01, 2014 at 02:04:14PM -0400, Dave Jones wrote:
> > On Tue, Apr 01, 2014 at 10:55:45AM -0700, Paul E. McKenney wrote:

[ . . . ]

> >  > Waiting uninterruptibly.  Presumably blocked on mutex_lock().  But
> >  > you have CONFIG_PROVE_LOCKING(), so any deadlocks should have been
> >  > reported.
> > 
> > Lockdep had reported something a little earlier (timestamped at 1108.xxxxxx)
> > but that's a known false-positive in xfs.
> 
> Yep, I would be very surprised if that was related to the grace-period hang.

Ah, but it could be suppressing later lockdep splats.  So if this can be
reproduced without xfs, we might get additional information from lockdep.

							Thanx, Paul

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