linux-kernel - Re: [PATCH] deadlock with suspend and quotas

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Message-ID: <Pine.LNX.4.64.1111281612030.11895@hs20-bc2-1.build.redhat.com>
Date:	Mon, 28 Nov 2011 16:14:05 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Valerie Aurora <val@...consulting.com>
cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, dm-devel@...hat.com,
	Christopher Chaltain <christopher.chaltain@...onical.com>
Subject: Re: [PATCH] deadlock with suspend and quotas

> >> The following patch fixes the deadlock. When the quota subsystem takes s_umount,
> >> it checks if the filesystem is frozen. If it is, we drop s_umount, wait for
> >> the filesystem to resume and retry.
> >  Thanks for the patch. I'm aware of the deadlock and Val Henson is working
> > on resolving these types of deadlocks more systematically. But since I
> > haven't heard from her for a while, I guess I'll merge your fix and she'll
> > update her series to reflect your change since those patches are going to
> > go in at earliest in the next merge window.
> >  To sum up: I've merged your patch.
> 
> FYI, I no longer have time to consult in addition to my full-time job.
>  Canonical is taking over this patch set.
> 
> -VAL

Hi

Where can I get that patch set?

We are experiencing other similar deadlocks on RHEL-6, caused by sync or 
background writeback (these code paths take s_umount and wait trying to do 
I/O), but I wasn't able to reproduce these deadlocks on upstream kernel? 
Are there other known deadlock possibilities?

Mikulas