linux-kernel - Re: regression 4.4: deadlock in with cgroup percpu

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Date:	Fri, 15 Jan 2016 11:40:23 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	"linux-kernel@...r.kernel.org >> Linux Kernel Mailing List" 
	<linux-kernel@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: regression 4.4: deadlock in with cgroup percpu_rwsem

On Fri, Jan 15, 2016 at 08:30:43AM +0100, Christian Borntraeger wrote:
> On 01/14/2016 08:56 PM, Tejun Heo wrote:
> > Hello,
> > 
> > Thanks a lot for the report and detailed analysis.  Can you please
> > test whether the following patch fixes the issue?
> > 
> > Thanks.
> > 
> 
> 
> Yes, the deadlock is gone and the system is still running.
> After some time I had the following WARN in the logs, though.
> Not sure yet if that is related.

Hmmm... doesn't seem to be related.  I'll spruce up the patch and
route it through cgroup tree w/ stable cc'd.  Please keep me posted on
the lockdep issue.

Thanks!

-- 
tejun