Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759488AbYARKTz (ORCPT ); Fri, 18 Jan 2008 05:19:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755884AbYARKTs (ORCPT ); Fri, 18 Jan 2008 05:19:48 -0500 Received: from ozlabs.org ([203.10.76.45]:33489 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755852AbYARKTr (ORCPT ); Fri, 18 Jan 2008 05:19:47 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <18320.32058.370817.762911@cargo.ozlabs.ibm.com> Date: Fri, 18 Jan 2008 21:19:38 +1100 From: Paul Mackerras To: Kamalesh Babulal Cc: Andrew Morton , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, Andy Whitcroft , Balbir Singh Subject: Re: 2.6.24-rc8-mm1 Kernel oops will running kernbench In-Reply-To: <479072BC.3080908@linux.vnet.ibm.com> References: <20080117023514.9df393cf.akpm@linux-foundation.org> <479064F0.7040305@linux.vnet.ibm.com> <20080118004416.6a757169.akpm@linux-foundation.org> <18320.27372.202771.764301@cargo.ozlabs.ibm.com> <479072BC.3080908@linux.vnet.ibm.com> X-Mailer: VM 7.19 under Emacs 21.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1771 Lines: 37 Kamalesh Babulal writes: > I tried reproducing the problem and was successful with following trace > in which the pc is at 0x4570 as the above one What did you do to trigger it? > c000000000004544 : > c000000000004544: 71 8a 40 00 andi. r10,r12,16384 > c000000000004548: 7c 2a 0b 78 mr r10,r1 > c00000000000454c: 38 21 fd 10 addi r1,r1,-752 > c000000000004550: 41 82 00 08 beq- c000000000004558 > c000000000004554: e8 2d 01 a8 ld r1,424(r13) > c000000000004558: 2c a1 00 00 cmpdi cr1,r1,0 > c00000000000455c: 40 84 00 08 bge- cr1,c000000000004564 > c000000000004560: 48 00 00 10 b c000000000004570 > c000000000004564: 38 20 41 00 li r1,16640 > c000000000004568: b0 2d 01 c8 sth r1,456(r13) > c00000000000456c: 4b ff fb 18 b c000000000004084 > c000000000004570: f9 21 01 a0 std r9,416(r1) So it's in the code that gets called on an unrecoverable SLB fault. That's bad, we should never get those. Does this happen with mainline too, or only with -rc8-mm1? I don't understand why we should start seeing this problem unless something has changed in arch/powerpc/kernel or arch/powerpc/mm (well I suppose a bug somewhere else could cause memory corruption which might be able to lead to this). Does it still happen if you take git-powerpc.patch out of the series? Paul. -- 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/