linux-kernel - Re: SLUB/debugobjects locking (Re: 2.6.27-rc4-git1: Reported regressions from 2.6.26)

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Date:	Thu, 28 Aug 2008 15:56:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Daniel J Blueman <daniel.blueman@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Lameter <clameter@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: SLUB/debugobjects locking (Re: 2.6.27-rc4-git1: Reported
	regressions from 2.6.26)


* Vegard Nossum <vegard.nossum@...il.com> wrote:

> On Wed, Aug 27, 2008 at 12:14 AM, Daniel J Blueman
> <daniel.blueman@...il.com> wrote:
> > On Mon, Aug 25, 2008 at 8:44 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> >> I tried your suggestion of promoting the lock to irq-safe, and it
> >> fixed the warning for me (didn't get or look for deadlocks yet, but it
> >> seems likely that it is caused by the same thing?), the patch is
> >> attached for reference.
> >>
> >> I also don't know if this is the best fix, but I also don't have any
> >> other (better) suggestions.
> >>
> >> Others are welcome to pick it up from here...
> >
> > The solution looks like is needs to get the lock ordering correct
> > w.r.t. SLUB, as we get this, alas:
> >
> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > 2.6.27-rc4-229c-debug #1
> 
> Hm. Is this with my first patch + the one in the e-mail you replied
> to? It was intended to be a delta patch on top of my first one.
> 
> That would be the one in
> 
>     http://marc.info/?l=linux-kernel&m=121946972307110&w=4
> 
> plus the one in
> 
>     http://marc.info/?l=linux-kernel&m=121969394110327&w=1
> 
> Thanks for testing and sorry for the confusion. (Maybe I just confused
> myself. Please let me know either way.)

could you resend the final patch please? It's a candidate for .27, if it 
works out fine.

	Ingo
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