Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757826Ab1FJPei (ORCPT ); Fri, 10 Jun 2011 11:34:38 -0400 Received: from e1.ny.us.ibm.com ([32.97.182.141]:40336 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757789Ab1FJPeh (ORCPT ); Fri, 10 Jun 2011 11:34:37 -0400 Subject: Re: BUG on 3.0-rc on commit d72bce0e67e8afc6eb959f656013cbb577426f1e From: Andrew Theurer Reply-To: habanero@linux.vnet.ibm.com To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, rostedt , paulmck In-Reply-To: <1307717156.3941.169.camel@twins> References: <1307711837.23688.33.camel@atheurer-ubuntu10> <1307715084.3941.166.camel@twins> <1307717156.3941.169.camel@twins> Content-Type: text/plain; charset="UTF-8" Date: Fri, 10 Jun 2011 10:34:41 -0500 Message-ID: <1307720081.17297.6.camel@atheurer-w510> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3853 Lines: 90 On Fri, 2011-06-10 at 16:45 +0200, Peter Zijlstra wrote: > On Fri, 2011-06-10 at 16:11 +0200, Peter Zijlstra wrote: > > On Fri, 2011-06-10 at 08:17 -0500, Andrew Theurer wrote: > > > Looks like commit d72bce0e67e8afc6eb959f656013cbb577426f1e breaks my > > > boot: > > > > > > BUG: unable to handle kernel NULL pointer dereference at > > > 0000000000000004 > > > IP: [] find_lowest_rq+0xa1/0x150 > > > PGD 0 > > > Oops: 0000 [#1] SMP > > > CPU 0 > > > Modules linked in: > > > > > > > > This is on a Westmere-EX (4 socket, 40 cores) > > > > Hmm, how often does that happen? my wsm-ep (2*6*2) doesn't seem to > > suffer said problem. I'll try and see if I can spot the boo-boo. Also, > > happen to have a .config handy? > > Does the below cure things? I am afraid not: Linux version 3.0.0-rc2-00251-g7f45e5c-dirty (root@vg-host.linuxperf9025.net) (gcc version 4.4.5 20110214 (Red Hat 4.4.5-6) (GCC) ) #34 SMP Fri Jun 10 10:23:06 CDT 2011 Command line: initrd=vg-host/initramfs.img ro root=UUID=7e96e905-9ec4-45ab-abd4-77d1469d6e5a console=tty0 console=ttyS0,115200 rdshell BOOT_IMAGE=vg-host/vmlinuz . . . . NMI watchdog enabled, takes one hw-pmu counter. #23 NMI watchdog enabled, takes one hw-pmu counter. #24 BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] find_lowest_rq+0xa1/0x150 PGD 0 Oops: 0000 [#1] SMP CPU 0 Modules linked in: Pid: 1, comm: swapper Not tainted 3.0.0-rc2-00251-g7f45e5c-dirty #34 IBM -[7145AC1]-/Node 1, Processor Card RIP: 0010:[] [] find_lowest_rq+0xa1/0x150 RSP: 0018:ffff883732925ca0 EFLAGS: 00010002 RAX: 0000000000000010 RBX: 0000000000000010 RCX: 0000000000000050 RDX: 00000000ffffffff RSI: 0000000000000050 RDI: 0000000000000050 RBP: ffff883732925cd0 R08: ffff8837325b4238 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000012ac0 FS: 0000000000000000(0000) GS:ffff88387f800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000000 CR3: 0000000001a03000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 1, threadinfo ffff883732924000, task ffff8837329234c0) Stack: ffff883732925cd0 0000000000000010 0000000000000010 ffff8837325b4800 0000000000000000 0000000000000286 ffff883732925cf0 ffffffff8104e9ea ffff883732642040 ffff8837325b4040 ffff883732925d40 ffffffff8105ac79 Call Trace: [] select_task_rq_rt+0x7a/0x90 [] try_to_wake_up+0x119/0x2a0 [] wake_up_process+0x15/0x20 [] rcu_cpu_notify+0xd6/0x196 [] notifier_call_chain+0x55/0x80 [] __raw_notifier_call_chain+0xe/0x10 [] __cpu_notify+0x20/0x40 [] _cpu_up+0xc7/0x10e [] cpu_up+0xd7/0xea [] smp_init+0x41/0x96 [] kernel_init+0x1d6/0x262 [] kernel_thread_helper+0x4/0x10 [] ? do_basic_setup+0x5c/0x5c [] ? gs_change+0x13/0x13 Code: 2a 01 00 48 89 fe 48 8b 04 c5 40 a3 bf 81 4c 89 e2 49 8b 84 07 88 08 00 00 48 83 c0 38 48 89 c7 e8 85 75 0a 00 85 c0 74 ae 89 d8 0f a3 1c 24 19 d2 85 d2 75 a6 45 0f a3 2c 24 19 c0 41 be ff RIP [] find_lowest_rq+0xa1/0x150 RSP CR2: 0000000000000000 ---[ end trace 050353be83bb766f ]--- -Andrew -- 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/