Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753390Ab1EDKpg (ORCPT ); Wed, 4 May 2011 06:45:36 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:56941 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751315Ab1EDKpf (ORCPT ); Wed, 4 May 2011 06:45:35 -0400 Date: Wed, 4 May 2011 12:45:20 +0200 From: Ingo Molnar To: Linus Torvalds , Jens Axboe , Andrew Morton , Pekka Enberg Cc: werner , "H. Peter Anvin" , Thomas Gleixner , Linux Kernel Mailing List Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs Message-ID: <20110504104520.GA5502@elte.hu> References: <20110503190822.GA20520@elte.hu> <20110504083559.GB25724@elte.hu> <20110504101327.GA847@elte.hu> <20110504104140.GA5277@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110504104140.GA5277@elte.hu> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1061 Lines: 38 * Ingo Molnar wrote: > Note that i reported similar problems early during this merge window, in this mail: > > [sporadic crash] blk: request botched > > That sha1 was 89078d572eb9ce8d4c04264b8b0ba86de0d74c8f - that already had > lockless SLUB: > > e8c500c2b64b: Merge branch 'slub/lockless' into for-linus > > I never managed to pin that down, these IO problems were very sporadic in my > test setup and never reproducible, until today. So i'm doing a testrun now with a failing kernel with the patch below applied, to disable the SLUB lockless code. Ingo diff --git a/mm/slub.c b/mm/slub.c index 94d2a33..27bc3be 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -30,6 +30,8 @@ #include +#undef CONFIG_CMPXCHG_LOCAL + /* * Lock order: * 1. slab_lock(page) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/