linux-kernel - Re: [linux-pm] WARNING: at kernel/power/main.c:176 suspend_test

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Date:	Fri, 10 Oct 2008 10:31:35 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Parag Warudkar <parag.lkml@...il.com>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] WARNING: at kernel/power/main.c:176
 suspend_test_finish+0x70/0x80()

On Fri, 10 Oct 2008, Rafael J. Wysocki wrote:

> On Friday, 10 of October 2008, Parag Warudkar wrote:
> > 2.6.27 seems to be taking long time to resume, it hits this WARN_ON in
> > kernel/power/main.c:176 suspend_test_finish -
> > Never seen earlier.
> 
> Resuming devices takes too much time (more than 5 sec. actually)
> and the stack trace indicates USB.
> 
> Can you test with the USB modules unloaded?

There's a bug that affects USB power management: commmit 
f9dd45ce10a014bdfd5432828c44630ea7fefedd needs to be reverted.  Greg KH
has been asked to do this a few times but he hasn't gotten around to it 
yet.

Alan Stern

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