Messages in this thread | | | Date | Mon, 12 May 2014 22:17:29 -0400 | From | Sasha Levin <> | Subject | Re: workqueue: WARN at at kernel/workqueue.c:2176 |
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On 05/12/2014 10:19 PM, Lai Jiangshan wrote: > On 05/13/2014 04:01 AM, Tejun Heo wrote: >> > On Mon, May 12, 2014 at 02:58:55PM -0400, Sasha Levin wrote: >>> >> Hi all, >>> >> >>> >> While fuzzing with trinity inside a KVM tools guest running the latest -next >>> >> kernel I've stumbled on the following spew: >>> >> >>> >> [ 1297.886670] WARNING: CPU: 0 PID: 190 at kernel/workqueue.c:2176 process_one_work+0xb5/0x6f0() >>> >> [ 1297.889216] Modules linked in: >>> >> [ 1297.890306] CPU: 0 PID: 190 Comm: kworker/3:0 Not tainted 3.15.0-rc5-next-20140512-sasha-00019-ga20bc00-dirty #456 >>> >> [ 1297.893258] 0000000000000009 ffff88010c5d7ce8 ffffffffb153e1ec 0000000000000002 >>> >> [ 1297.893258] 0000000000000000 ffff88010c5d7d28 ffffffffae15fd6c ffff88010cdd6c98 >>> >> [ 1297.893258] ffff8806285d4000 ffffffffb3cd09e0 ffff88010cdde000 0000000000000000 >>> >> [ 1297.893258] Call Trace: >>> >> [ 1297.893258] dump_stack (lib/dump_stack.c:52) >>> >> [ 1297.893258] warn_slowpath_common (kernel/panic.c:430) >>> >> [ 1297.893258] warn_slowpath_null (kernel/panic.c:465) >>> >> [ 1297.893258] process_one_work (kernel/workqueue.c:2174 (discriminator 38)) >>> >> [ 1297.893258] worker_thread (kernel/workqueue.c:2354) >>> >> [ 1297.893258] kthread (kernel/kthread.c:210) >>> >> [ 1297.893258] ret_from_fork (arch/x86/kernel/entry_64.S:553) > Hi, > > I have been trying to address this bug. > Buy I can't reproduce this bug. Is your testing arch X86? > if yes, could you find out how to reproduce the bug?
Yup, it's a 64bit KVM guest.
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?
Thanks, Sasha
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