From: "Jason J. Herne" <jjherne@linux.vnet.ibm.com>
To: Sasha Levin <sasha.levin@oracle.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Tejun Heo <tj@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Dave Jones <davej@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: workqueue: WARN at at kernel/workqueue.c:2176
Date: Wed, 14 May 2014 12:52:11 -0400 [thread overview]
Message-ID: <53739F3B.4060608@linux.vnet.ibm.com> (raw)
In-Reply-To: <537180B9.6080407@oracle.com>
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@linux.vnet.ibm.com)
next prev parent reply other threads:[~2014-05-14 16:52 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-12 18:58 workqueue: WARN at at kernel/workqueue.c:2176 Sasha Levin
2014-05-12 20:01 ` Tejun Heo
2014-05-13 2:19 ` Lai Jiangshan
2014-05-13 2:17 ` Sasha Levin
2014-05-14 16:52 ` Jason J. Herne [this message]
2014-05-16 3:50 ` Lai Jiangshan
2014-05-16 9:35 ` Peter Zijlstra
2014-05-16 9:56 ` Lai Jiangshan
2014-05-16 10:29 ` Peter Zijlstra
2014-05-16 10:15 ` Peter Zijlstra
2014-05-16 10:16 ` Peter Zijlstra
2014-05-16 10:39 ` Peter Zijlstra
2014-05-16 11:57 ` Peter Zijlstra
2014-05-16 12:08 ` Tejun Heo
2014-05-16 12:14 ` Thomas Gleixner
2014-05-16 12:16 ` Tejun Heo
2014-05-16 16:18 ` Lai Jiangshan
2014-05-16 16:29 ` Peter Zijlstra
2014-05-27 14:18 ` Jason J. Herne
2014-05-27 14:26 ` Peter Zijlstra
2014-05-29 16:23 ` Jason J. Herne
2014-06-03 11:24 ` Lai Jiangshan
2014-06-03 12:45 ` Lai Jiangshan
2014-06-03 14:28 ` Peter Zijlstra
2014-06-04 1:47 ` Lai Jiangshan
2014-06-03 14:16 ` Peter Zijlstra
2014-06-04 2:27 ` Lai Jiangshan
2014-06-04 6:49 ` Peter Zijlstra
2014-06-04 8:25 ` Lai Jiangshan
2014-06-04 9:39 ` Peter Zijlstra
2014-06-05 10:54 ` Lai Jiangshan
2014-06-05 15:22 ` Jason J. Herne
2014-06-06 12:39 ` Jason J. Herne
2014-06-06 13:36 ` Peter Zijlstra
2014-06-08 2:50 ` Lai Jiangshan
2014-09-01 3:04 ` Lai Jiangshan
2014-09-03 15:15 ` Peter Zijlstra
2014-09-04 2:22 ` Lai Jiangshan
2014-09-04 6:39 ` Peter Zijlstra
2014-06-09 14:01 ` Jason J. Herne
2014-06-10 1:21 ` Lai Jiangshan
2014-06-16 1:30 ` Lai Jiangshan
2014-09-09 14:52 ` [tip:sched/core] sched: Migrate waking tasks tip-bot for Lai Jiangshan
2014-09-10 7:38 ` Kirill Tkhai
2014-09-10 7:53 ` Peter Zijlstra
2014-06-04 2:28 ` workqueue: WARN at at kernel/workqueue.c:2176 Lai Jiangshan
2014-06-04 6:48 ` Peter Zijlstra
2014-05-19 13:07 ` [tip:sched/core] sched: Fix hotplug vs set_cpus_allowed_ptr() tip-bot for Lai Jiangshan
2014-05-22 12:26 ` [tip:sched/core] sched: Fix hotplug vs. set_cpus_allowed_ptr() tip-bot for Lai Jiangshan
2014-05-22 22:02 ` Srivatsa S. Bhat
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