linux-kernel - Re: [BISECTED] drm: random hang since 620f378 "drm: prune modes when ..."

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Message-ID: <20091213200017.GA3522@viiv.ffwll.ch>
Date:	Sun, 13 Dec 2009 21:00:18 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Dave Airlie <airlied@...hat.com>, Adam Jackson <ajax@...hat.com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.sourceforge.net,
	keithp@...thp.com, eric@...olt.net, jbarnes@...tuousgeek.org,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [BISECTED] drm: random hang since 620f378 "drm: prune modes
 when ..."

On Sun, Dec 13, 2009 at 12:30:25PM +0000, Arnd Bergmann wrote:
> And now it's obvious that my computer hates me. 12 hours of uptime, one reboot
> to check the old other version is broken, it crashes. I reboot into the
> good version, send out the above email and the next minute it crashes again.
> c05422d52ee6b is not the culprit. Sorry Daniel for blaming your patch.

No problem. Looks like your hunting a pretty ugly Heisenbug. There's quite
a interesting blog post by Paul McKenney, esp. the solution to "Quick Quiz 1"
might be usefull in your case:

http://paulmck.livejournal.com/14639.html

Happy Hunting, Daniel
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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