lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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/

Powered by blists - more mailing lists