linux-kernel - Re: [BUG] cgroup/workques/fork: deadlock when moving cgroups

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Message-ID: <20160414070623.GC2850@dhcp22.suse.cz>
Date:	Thu, 14 Apr 2016 09:06:23 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Petr Mladek <pmladek@...e.com>, cgroups@...r.kernel.org,
	Cyril Hrubis <chrubis@...e.cz>, linux-kernel@...r.kernel.org,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [BUG] cgroup/workques/fork: deadlock when moving cgroups

On Wed 13-04-16 21:48:20, Michal Hocko wrote:
[...]
> I was thinking about something like flush_per_cpu_work() which would
> assert on group_threadgroup_rwsem held for write.

I have thought about this some more and I guess this is not limitted to
per cpu workers. Basically any flush_work with group_threadgroup_rwsem
held for write is dangerous, right?
-- 
Michal Hocko
SUSE Labs