From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754226Ab2IXLGE (ORCPT ); Mon, 24 Sep 2012 07:06:04 -0400 Received: from mail.x86-64.org ([217.9.48.20]:60430 "EHLO mail.x86-64.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753808Ab2IXLGC (ORCPT ); Mon, 24 Sep 2012 07:06:02 -0400 Date: Mon, 24 Sep 2012 13:05:54 +0200 From: Borislav Petkov To: "Srivatsa S. Bhat" Cc: Borislav Petkov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Fengguang Wu , Jan Kara , Peter Zijlstra , Andrew Morton , Johannes Weiner , Conny Seidel Subject: Re: divide error: bdi_dirty_limit+0x5a/0x9e Message-ID: <20120924110554.GC22303@aftab.osrc.amd.com> References: <20120924102324.GA22303@aftab.osrc.amd.com> <50603829.9050904@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50603829.9050904@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 24, 2012 at 04:08:33PM +0530, Srivatsa S. Bhat wrote: > On 09/24/2012 03:53 PM, Borislav Petkov wrote: > > Hi all, > > > > we're able to trigger the oops below when doing CPU hotplug tests. > > > > I hit this problem as well, which I reported here, a few days ago: > https://lkml.org/lkml/2012/9/13/222 Ok, your case shows even more info: [ 526.024180] divide error: 0000 [#1] SMP [ 526.028144] Modules linked in: ipv6 cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf fuse loop dm_mod iTCO_wdt iTCO_vendor_support coretemp kvm_intel kvm cdc_ether pcspkr usbnet shpchp pci_hotplug i2c_i801 i2c_core ioatdma mii crc32c_intel serio_raw microcode lpc_ich mfd_core i7core_edac bnx2 dca edac_core tpm_tis tpm sg tpm_bios rtc_cmos button uhci_hcd ehci_hcd usbcore usb_common sd_mod crc_t10dif edd ext3 mbcache jbd fan processor mptsas mptscsih mptbase scsi_transport_sas scsi_mod thermal thermal_sys hwmon [ 526.028145] CPU 9 [ 526.028145] Pid: 2235, comm: flush-8:0 Not tainted 3.6.0-rc1-tglx-hotplug-0.0.0.28.36b5ec9-default #1 IBM IBM System x -[7870C4Q]-/68Y8033 [ 526.028145] RIP: 0010:[] [] bdi_dirty_limit+0x66/0xc0 [ 526.028145] RSP: 0018:ffff8811530bfcc0 EFLAGS: 00010206 [ 526.028145] RAX: 0000000000b9877e RBX: 00000000001a8112 RCX: 28f5c28f5c28f5c3 [ 526.028145] RDX: 0000000000000000 RSI: 0000000000b9877e RDI: 0000000000000000 %rax contains something != 0 but %rdi definitely is 0. -- Regards/Gruss, Boris. Advanced Micro Devices GmbH Einsteinring 24, 85609 Dornach GM: Alberto Bozzo Reg: Dornach, Landkreis Muenchen HRB Nr. 43632 WEEE Registernr: 129 19551