Messages in this thread | | | Date | Wed, 14 May 2014 12:52:11 -0400 | From | "Jason J. Herne" <> | Subject | Re: workqueue: WARN at at kernel/workqueue.c:2176 |
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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)
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