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

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Message-ID: <37742.1237327272@turing-police.cc.vt.edu>
Date:	Tue, 17 Mar 2009 18:01:12 -0400
From:	Valdis.Kletnieks@...edu
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	jkosina@...e.cz, gregkh@...e.de, linux-kernel@...r.kernel.org,
	Lai Jiangshan <laijs@...fujitsu.com>,
	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

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.

I'm going to throw some printk's into the usb_reset_device() area and related
code, and see if I can figure out why a cooling pad was able to trigger it (was
seeing a hit every 90 mins or so at home, have been up over 7 hours straight
in the office).

I'll let somebody who understands the code better figure out what should be
happening once we get into that reset situation.

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