linux-kernel - Re: blkcg: circular dependency between blkcg_pol_mutex and s

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Message-ID: <20140504192630.GE26279@htj.dyndns.org>
Date:	Sun, 4 May 2014 15:26:30 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	axboe@...nel.dk, Li Zefan <lizefan@...wei.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, cgroups@...r.kernel.org
Subject: Re: blkcg: circular dependency between blkcg_pol_mutex and s_active

Hello,

On Fri, May 02, 2014 at 11:56:59AM -0400, Sasha Levin wrote:
> While fuzzing with trinity inside a KVM tools guest running the latest -next
> kernel I've stumbled on the following:

This is a highly unlikely deadlock which got introduced by recent
changes in cgroup core.  I'm working to further simplify locking in
cgroup core.  Will prep a quick fix for this issue soon.

Thanks.

-- 
tejun
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