Re: rcu_prempt stalls / lockup

[Dave Jones]

On Wed, Apr 02, 2014 at 09:20:43AM -0700, Paul E. McKenney wrote:
 > 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.

Hmm, I lack another test machine, and don't really feel like reinstalling it right now.
I'm halfway through a bisect, hopefully that's fruitful.

	Dave

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