linux-kernel - Re: WARNING at kernel/workqueue.c:829 wq_worker_waking

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Message-ID: <20140220145306.GC12948@krava.brq.redhat.com>
Date:	Thu, 20 Feb 2014 15:53:07 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Zhang Rui <rui.zhang@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: WARNING at kernel/workqueue.c:829 wq_worker_waking_up+0x53/0x70()

On Thu, Feb 20, 2014 at 10:45:32PM +0800, Lan Tianyu wrote:
> On 02/20/2014 10:31 PM, Jiri Olsa wrote:
> >On Thu, Feb 20, 2014 at 09:28:26PM +0800, Lan Tianyu wrote:
> >>On 02/19/2014 06:49 AM, Tejun Heo wrote:
> >>>Hello,
> >>>
> >>>On Mon, Feb 17, 2014 at 06:19:00PM +0100, Oleg Nesterov wrote:
> >>>>acpi_processor_set_throttling() plays with set_cpus_allowed_ptr(current),
> >>>>this is obviously wrong, and the worker is bound.
> >>>
> >>>Umm... yeah, anything running on workqueues shouldn't be diddling with
> >>>cpu affinity.  The function even has /* FIXME: use work_on_cpu() */ in
> >>>it.  I suppose it's about time to actually implement that?
> >>>
> >>>Thanks.
> >>>
> >>
> >>Hi Jiri:
> >>	Could you try this patch which reworks ACPI processor throttling
> >>with work_on_cpu()?
> >
> >hum, I've got difficulties to apply it..
> >
> >[jolsa@...va2 linux-perf]$ git am /tmp/wq/
> >Applying: WARNING at kernel/workqueue.c:829 wq_worker_waking_up+0x53/0x70()
> >fatal: corrupt patch at line 8
> >Patch failed at 0001 WARNING at kernel/workqueue.c:829 wq_worker_waking_up+0x53/0x70()
> >
> >jirka
> >
> Sorry. Please try the attachment again.

np, this one got applied cleanly ;-)

I started the workload.. it took several hours to hit
it before, I'll let you know

jirka
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