linux-kernel - Re: workqueue: WARN at at kernel/workqueue.c:2176

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Message-ID: <20140527142637.GB19143@laptop.programming.kicks-ass.net>
Date:	Tue, 27 May 2014 16:26:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: workqueue: WARN at at kernel/workqueue.c:2176

On Tue, May 27, 2014 at 10:18:31AM -0400, Jason J. Herne wrote:
> On 05/16/2014 12:29 PM, Peter Zijlstra wrote:
> >On Sat, May 17, 2014 at 12:18:06AM +0800, Lai Jiangshan wrote:
> >>so the scheduler/set_cpus_allowed_ptr()/cpu_active_mask should be the first
> >>place to fix.
> >
> >I'm not arguing about that, not to mention that this is userspace
> >exposed and nobody protects that.
> >
> >But I was expecting kernel stuff that calls it on hotplug to be
> >serialized thusly, but apparently not so.
> >
> 
> Was a final patch posted for this issue? The discussion made it sound like
> there were still a few things to figure out before we could resolve this
> bug. I can recreate this as needed and I'm happy to test any patches.


https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=sched/urgent&id=6acbfb96976fc3350e30d964acb1dbbdf876d55e

which should make its way to Linus soonish I suppose.
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