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Message-ID: <53739F3B.4060608@linux.vnet.ibm.com> Date: Wed, 14 May 2014 12:52:11 -0400 From: "Jason J. Herne" <jjherne@...ux.vnet.ibm.com> To: Sasha Levin <sasha.levin@...cle.com>, Lai Jiangshan <laijs@...fujitsu.com> CC: Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com> Subject: Re: workqueue: WARN at at kernel/workqueue.c:2176 On 05/12/2014 10:17 PM, Sasha Levin wrote: > I don't have an easy way to reproduce it as I only saw the bug once, but > it happened when I started pressuring CPU hotplug paths by adding and removing > CPUs often. Maybe it has anything to do with that? As per the original report (http://article.gmane.org/gmane.linux.kernel/1643027) I am able to reproduce the problem. The workload is (on S390 architecture): 2 processes onlining random cpus in a tight loop by using 'echo 1 > /sys/bus/cpu.../online' 2 processes offlining random cpus in a tight loop by using 'echo 0 > /sys/bus/cpu.../online' Otherwise, fairly idle system. load average: 5.82, 6.27, 6.27 The machine has 10 processors. The warning message some times hits within a few minutes on starting the workload. Other times it takes several hours. -- Jason J. Herne (jjherne@...ux.vnet.ibm.com) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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