linux-kernel - Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

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Message-ID: <12650.1190397280@turing-police.cc.vt.edu>
Date:	Fri, 21 Sep 2007 13:54:40 -0400
From:	Valdis.Kletnieks@...edu
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Matt Mackall <mpm@...enic.com>, Dave Airlie <airlied@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

On Fri, 21 Sep 2007 19:30:04 +0200, Jiri Slaby said:
> On 09/21/2007 07:16 PM, Valdis.Kletnieks@...edu wrote:
> > On Thu, 20 Sep 2007 17:06:05 CDT, Matt Mackall said:
> >> 2.6.23-rc3-mm1: solid lock on X shutdown (noticed when upgrading)
> >>       -rc4-mm1: solid lock on X shutdown, random solid locks about
> >>                 once every four hours
> >>       -rc6-mm1: solid lock on X startup
> >>    +your patch: screen goes black, turns off and on a few times during
> >>                 startup, can reboot with sysrq-b
> > 
> > Hmm.. maybe I'm chasing a different bug manifested by the same patch.  For me,
> > it's been a solid lockup at X startup since -rc3-mm1, and this patch doesn't
> > change matters.
> 
> This patch probably changes behaviour how the pages are queued on the list
> somehow. Maybe it's insane to suggest everybody with similar problem to try
> LIST_DEBUG, but just give it a try after having one of the patches applied ;).
> (Or have you tried yet?)

Haven't tried LIST_DEBUG yet.  I'm spending most of the weekend camping, so
will likely be unable to test that until Monday-ish (unless I get lucky and can
get a test in during the next 2 hours)...

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