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Message-ID: <20140402162330.GA26759@redhat.com> Date: Wed, 2 Apr 2014 12:23:30 -0400 From: Dave Jones <davej@...hat.com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: rcu_prempt stalls / lockup 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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