linux-kernel - Re: sysrq-t dumps of s2ram/fuse deadlock (was Re: [PATCH] Remove process freezer from suspend to RAM pathway)

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Message-ID: <20070712091714.GD1866@elf.ucw.cz>
Date:	Thu, 12 Jul 2007 11:17:14 +0200
From:	Pavel Machek <pavel@....cz>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: sysrq-t dumps of s2ram/fuse deadlock (was Re: [PATCH] Remove process freezer from suspend to RAM pathway)

On Wed 2007-07-11 14:28:20, Matthew Garrett wrote:
> On Mon, Jul 09, 2007 at 01:29:05PM +0000, Pavel Machek wrote:
> > Hi!
> > 
> > Can we get them? They are neccessary for debugging 'what in suspend
> > calls fuse' problem. And yes, that problem is there even when you
> > remove freezer.
> 
> I can produce them, but haven't managed to do that in any way that lets 
> me get them off the system yet.
> 
> > Matthew, you seem to be the only one able to produce them...
> 
> sys_sync may not do anything on a fuse filesystem, but if you've 
> loopback-mounted an ext3 filesystem from that fuse filesystem then it's 
> going to result in writes to it and deadlock.

Aha, yes, that explains the problem. Thanks!
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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