linux-kernel - Re: Intermittent early panic in try_to_wake

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Message-Id: <200911072001.16223.rjw@sisk.pl>
Date:	Sat, 7 Nov 2009 20:01:16 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Kevin Winchester <kjwinchester@...il.com>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: Intermittent early panic in try_to_wake_up

On Saturday 07 November 2009, Peter Zijlstra wrote:
> On Sat, 2009-11-07 at 12:24 -0400, Kevin Winchester wrote:
> > Mike Galbraith wrote:
> > > On Fri, 2009-11-06 at 19:49 -0400, Kevin Winchester wrote:
> > > 
> > >> The patch below does not apply to mainline, unless I'm doing something wrong.
> > >> It's against -tip, I assume?  Is it just as applicable to mainline?
> > > 
> > > It was mainline, but I had the scheduler pull request and another in for
> > > testing as well.  Linus has pulled, so it'll apply now, with offsets.
> > > 
> > 
> > It did end up applying, but did not have any effect.  Looking at the patch
> > again, I see that it appears to only affect CONFIG_SMP, which I am not
> > running (and in fact it adds a build warning for the !SMP case).  So there
> > was not much chance of it fixing anything, I suppose.
> > 
> > Any other ideas?  I don't have a serial console, and the trace scrolls off
> > my console, so I don't know if any debug printks would help.  Would it help
> > if I copied the entire panic message entirely, including the Code section?
> > I can try that the next time it happens.
> 
> Use vga=ask boot_delay=100 select the highest res possible.
> 
> Possibly you could use a digital (video) camera to record the output.

FWIW, I see a crash in autoremove_wake_function() during resume from suspend
to RAM that happens immediately before the thawing of tasks.  It always happens
in the "events" thread.  I can trigger it quite reliably, although not 100% of
the time.

I can only see the bottom half of the call trace, so I can't really say what
kind of a crash this is.

Also, for quite some time I've been observing a resume-from-hibernation crash
during the final switch from a VT to X that could also be explained by a
problem with "events".

Best,
Rafael
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