linux-kernel - Re: rcu_prempt stalls / lockup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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/