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

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Message-ID: <20140516162945.GZ11096@twins.programming.kicks-ass.net>
Date:	Fri, 16 May 2014 18:29:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	jjherne@...ux.vnet.ibm.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 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.

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