Re: Intermittent early panic in try_to_wake_up

From: Rafael J. Wysocki
Date: Sat Nov 07 2009 - 14:00:12 EST

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".

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