linux-kernel - Re: 29-rc-mmotm - HID/USB wedge w/ WARNING: at kernel/workqueue.c:371

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Date:	Wed, 18 Mar 2009 10:29:40 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Valdis.Kletnieks@...edu
CC:	Andrew Morton <akpm@...ux-foundation.org>, jkosina@...e.cz,
	gregkh@...e.de, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...sign.ru>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: 29-rc-mmotm - HID/USB wedge w/ WARNING: at kernel/workqueue.c:371

Valdis.Kletnieks@...edu wrote:
> On Tue, 17 Mar 2009 13:54:24 PDT, Andrew Morton said:
> 
>> It's an error in workqueue-avoid-recursion-in-run_workqueue.patch, methinks.
> 
> Thanks for the diagnosis - I got as far as realizing that any backtrace that
> included flush_cpu_workqueue() and worker_thread() had a problem and got
> stuck there.
> 

It's dangerous when we allow recursion in run_workqueue().

If it's hard for you avoid flush_scheduled_work() in
keventd's work fuction by other fix, you can create
another workqueue to handle your works, IMO.

Thanks
Lai jiangshan

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