Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755952AbXIQObR (ORCPT ); Mon, 17 Sep 2007 10:31:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754290AbXIQObB (ORCPT ); Mon, 17 Sep 2007 10:31:01 -0400 Received: from rgminet01.oracle.com ([148.87.113.118]:22781 "EHLO rgminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754215AbXIQObA (ORCPT ); Mon, 17 Sep 2007 10:31:00 -0400 Message-ID: <46EE8F63.3070108@oracle.com> Date: Mon, 17 Sep 2007 07:29:55 -0700 From: Randy Dunlap User-Agent: Thunderbird 1.5.0.5 (X11/20060719) MIME-Version: 1.0 To: Linus Torvalds CC: Andi Kleen , lkml , Jan Beulich , Ingo Molnar , Zachary Amsden Subject: Re: crashme fault References: <20070912222151.70d1fc7d.randy.dunlap@oracle.com> <20070915183412.GA14501@one.firstfloor.org> <46EC2702.3090000@oracle.com>

<46EC6F2A.5090008@oracle.com> <20070916094001.d87ed0f0.randy.dunlap@oracle.com>

<20070916220643.bea3e44f.randy.dunlap@oracle.com> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAQAAAAI= X-Brightmail-Tracker: AAAAAQAAAAI= X-Whitelist: TRUE X-Whitelist: TRUE Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2926 Lines: 57 Linus Torvalds wrote: > > On Sun, 16 Sep 2007, Randy Dunlap wrote: >> I'll test this overnight on 2.6.23-rc6-git2 since that was failing. >> >> I haven't been able to reproduce the fault on 2.6.21 after several >> hours of testing. >> >> I'll also test a microcode update to see if it helps. > > Before you do the microcode update, try to see if you can bisect the place > between 2.6.21->22 that seems to start it. Even if you don't get all the > way, if you are confident enough about the "no error" case to be able to > bisect it down by doing a few reboots, it will at least cut down the set > of possible commits by roughly a factor of 2^ events, so > even "just" a series of 4-5 bisect things might give us more of a clue. OK, I haven't done the microcode update yet. I ran crashme overnight with your newer patch and it crashed: [14254.327676] Unable to handle kernel paging request at 00000000ff021eaf RIP: [14254.332299] [<0000000000504225>] [14254.338084] PGD d8542067 PUD 0 [14254.341271] Oops: 0000 [1] SMP [14254.344449] CPU 3 [14254.346484] Modules linked in: loop [14254.350001] Pid: 28565, comm: crashme Not tainted 2.6.23-rc6-git2 #2 [14254.356349] RIP: 0033:[<0000000000504225>] [<0000000000504225>] [14254.362376] RSP: 002b:00007fff5afccbf8 EFLAGS: 00010656 [14254.367685] RAX: 000000005afccbf8 RBX: 00002abd4fbf5c00 RCX: 00002abd4fc88b37 [14254.374812] RDX: 0000000000504220 RSI: 0000000000000000 RDI: 000000000000000a [14254.381939] RBP: 00007fff5afccc00 R08: 00007fff5afccb50 R09: 0000000000000000 [14254.389068] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [14254.396195] R13: 00007fff5afccdf0 R14: 0000000000000000 R15: 0000000000000000 [14254.403324] FS: 00002abd4fe276d0(0000) GS:ffff81011fc751c0(0000) knlGS:0000000000000000 [14254.411403] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [14254.417144] CR2: 00000000ff021eaf CR3: 00000000d85f6000 CR4: 00000000000006e0 [14254.424273] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [14254.431400] DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [14254.438528] Process crashme (pid: 28565, threadinfo ffff8100d8970000, task ffff8100d8628820) [14254.446953] [14254.448443] RIP [<0000000000504225>] [14254.452124] RSP <00007fff5afccbf8> [14254.455614] CR2: 00000000ff021eaf [14254.459244] Kernel panic - not syncing: Fatal exception > Of course, if it's somewhat random and timing-dependent, bisection can be > hard (the "2^n" thing is very efficient, but it also means that a *single* > wrong answer will totally invalidate the result, so if something isn't > entirely reproducible, bisection often fails!) - 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/