On Mon, Apr 14, 2014 at 03:08:36PM -0400, Brian Foster wrote: > On Mon, Apr 14, 2014 at 12:43:14PM -0400, Brian Foster wrote: > > Hi all, > > > > This is a heads up that I'm seeing a blatant readdir hang on the current > > for-next with selinux enabled. To reproduce, I format a clean fs, mount > > and attempt an ls. > > > > The problem does not occur with selinux disabled, if I back out the > > following commit: > > > > 40194ecc6d78 xfs: reinstate the ilock in xfs_readdir > > > > ... or if I remove the locking around xfs_attr_get(), so I suspect this > > is another instance of a recursive deadlock. I'm getting no output > > whatsoever in order to confirm this and it also leads to a complete > > system lockup. It's also interesting that this hasn't been observed > > until now, given the above commit was introduced in 3.14. So the above > > commit doesn't appear to be the most recent change that triggers this. > > > > I reproduced on the latest linus tree and do not reproduce on 3.14, so > > I'm trying to do a bisect to find out what else might have changed to > > trigger this. > > > > This bisected down to: > > commit 6f008e72cd111a119b5d8de8c5438d892aae99eb > Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Date: Wed Mar 12 13:24:42 2014 +0100 > > locking/mutex: Fix debug checks > ... > > ... which suggests something down in the mutex debug code. Indeed, the > problem no longer occurs if I disable kernel debug in my .config. What > is also interesting is that it didn't return when I reenable > DEBUG_KERNEL and DEBUG_MUTEXES alone. It does return when I start to > enable some of the other lock debugging options. FWIW, I also cleared > out my tree and rebuilt from scratch just to be sure that I didn't have > anything stale/broken lying around. > > Peter, > > Any insight on this? http://lkml.kernel.org/r/tip-a227960fe0cafcc229a8d6bb8b454a3a0b33719d@xxxxxxxxxxxxxx That will make the kernel continue after the lockdep splat. I too see it on some of my XFS using machines. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
