linux-kernel - Re: [linux-pm] Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt

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Date:	Mon, 9 Nov 2009 21:48:03 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt_count leakage in keventd

On Monday 09 November 2009, Alan Stern wrote:
> On Mon, 9 Nov 2009, Rafael J. Wysocki wrote:
> 
> > Still, RIP always points to list_del_init(cwq->worklist.next); in
> > run_workqueue().
> 
> Use a big hammer: Create a new global variable, set it to 1 while
> resuming and back to 0 after the tasks have been thawed.  While the
> variable is nonzero, print in the log the list pointers in
> cwq->worklist just before executing the list_del_init().  Maybe also 
> print some other interesting information about cwq.

I've just sent a message containing full call trace.

It shows the problem is a general protection fault that happens _after_ we've
thawed tasks.

Thanks,
Rafael
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