linux-kernel - Re: [RFC/PATCH] SLQB: Mark the allocator as broken PowerPC and S390

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Message-ID: <20090917123627.GP18404@wotan.suse.de>
Date:	Thu, 17 Sep 2009 14:36:27 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, Mel Gorman <mel@....ul.ie>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	cl@...ux-foundation.org, mingo@...e.hu, sachinp@...ibm.com
Subject: Re: [RFC/PATCH] SLQB: Mark the allocator as broken PowerPC and S390

On Thu, Sep 17, 2009 at 02:21:41PM +0200, Heiko Carstens wrote:
> On Thu, Sep 17, 2009 at 03:16:21PM +0300, Pekka Enberg wrote:
> > On Thu, 2009-09-17 at 14:12 +0200, Heiko Carstens wrote:
> > > Ok, I just wanted to debug this on s390. But... the bug seems to have
> > > disappeared.
> > > I pulled in
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6.git slqb/core
> > > 
> > > and tried defconfig (+SLQB) as well as allyesconfig (+SLQB). Both started and
> > > didn't show the crash-before-console-is-active which went away when switching
> > > to a different allocator.
> > > So the s390 restriction seems to be resolved. Don't know why...
> > 
> > IIRC, this is the only bug fix that was merged after your report:
> > 
> > http://git.kernel.org/?p=linux/kernel/git/penberg/slab-2.6.git;a=commitdiff;h=ff61c4950125b09b5e5a83d48a6c81827e9d67ab
> 
> Still works even if I revert that patch. Probably something else interfered.

Nasty. I don't suppose it would be too much work to try bisecting it?
Unfortunately with this kind of thing, bisecting doesn't always point
to anything meaningful anyway :(
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