From: Thomas Gleixner <tglx@linutronix.de>
To: Mike Galbraith <mgalbraith@novell.com>
Cc: Jan Kara <jack@suse.cz>, Jeff Moyer <jmoyer@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org, Tejun Heo <tj@kernel.org>,
Jens Axboe <jaxboe@fusionio.com>,
mgalbraith@suse.com
Subject: Re: Deadlocks due to per-process plugging
Date: Sun, 15 Jul 2012 11:51:22 +0200 (CEST) [thread overview]
Message-ID: <alpine.LFD.2.02.1207151150150.32033@ionos> (raw)
In-Reply-To: <1342343673.28142.2.camel@marge.simpson.net>
On Sun, 15 Jul 2012, Mike Galbraith wrote:
> On Sun, 2012-07-15 at 10:59 +0200, Thomas Gleixner wrote:
> > On Fri, 13 Jul 2012, Jan Kara wrote:
> > > On Fri 13-07-12 16:25:05, Thomas Gleixner wrote:
> > > > So the patch below should allow the unplug to take place when blocked
> > > > on mutexes etc.
> > > Thanks for the patch! Mike will give it some testing.
> >
> > I just found out that this patch will explode nicely when the unplug
> > code runs into a contended lock. Then we try to block on that lock and
> > make the rtmutex code unhappy as we are already blocked on something
> > else.
>
> Kinda like so? My x3550 M3 just exploded. Aw poo.
Yep. Would have surprised me if it never triggered.
> > So no, it's not a solution to the problem. Sigh.
> >
> > Can you figure out on which lock the stuck thread which did not unplug
> > due to tsk_is_pi_blocked was blocked?
>
> I'll take a peek.
Thanks!
next prev parent reply other threads:[~2012-07-15 9:51 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-11 13:37 Deadlocks due to per-process plugging Jan Kara
2012-07-11 16:05 ` Jeff Moyer
2012-07-11 20:16 ` Jan Kara
2012-07-11 22:12 ` Thomas Gleixner
2012-07-12 4:12 ` Mike Galbraith
2012-07-13 12:38 ` Jan Kara
2012-07-12 2:07 ` Mike Galbraith
2012-07-12 14:15 ` Thomas Gleixner
2012-07-13 12:33 ` Jan Kara
2012-07-13 14:25 ` Thomas Gleixner
2012-07-13 14:46 ` Jan Kara
2012-07-15 8:59 ` Thomas Gleixner
2012-07-15 9:14 ` Mike Galbraith
2012-07-15 9:51 ` Thomas Gleixner [this message]
2012-07-16 2:22 ` Mike Galbraith
2012-07-16 8:59 ` Thomas Gleixner
2012-07-16 9:48 ` Mike Galbraith
2012-07-16 9:59 ` Thomas Gleixner
2012-07-16 10:13 ` Mike Galbraith
2012-07-16 10:08 ` Mike Galbraith
2012-07-16 10:19 ` Thomas Gleixner
2012-07-16 10:30 ` Mike Galbraith
2012-07-16 11:24 ` Mike Galbraith
2012-07-16 14:35 ` Mike Galbraith
2012-07-17 13:10 ` Mike Galbraith
2012-07-18 4:44 ` Mike Galbraith
2012-07-18 5:30 ` Mike Galbraith
2012-07-21 7:47 ` Mike Galbraith
2012-07-22 18:43 ` Mike Galbraith
2012-07-23 9:46 ` Mike Galbraith
2012-07-14 11:00 ` Mike Galbraith
2012-07-14 11:06 ` Mike Galbraith
2012-07-15 7:14 ` Mike Galbraith
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