From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933391AbaDINgW (ORCPT ); Wed, 9 Apr 2014 09:36:22 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:15634 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932748AbaDINgS (ORCPT ); Wed, 9 Apr 2014 09:36:18 -0400 Message-ID: <53454CBC.9060905@fb.com> Date: Wed, 9 Apr 2014 07:35:56 -0600 From: Jens Axboe User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Benjamin Herrenschmidt CC: Jan Kara , Linux Kernel Mailing List , Frederic Weisbecker , James Bottomley , Brian J King Subject: Re: [BUG] kernel BUG at /.../block/cfq-iosched.c:3145! References: <1397018647.3671.123.camel@pasglop> In-Reply-To: <1397018647.3671.123.camel@pasglop> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.57.29] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.11.96,1.0.14,0.0.0000 definitions=2014-04-09_02:2014-04-09,2014-04-09,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1404090078 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/08/2014 10:44 PM, Benjamin Herrenschmidt wrote: > Hi folks ! > > While testing a branch of fixes before I send it to Linus, which > happens to be based on 18a1a7a1d862ae0794a0179473d08a414dd49234, > I hit this: > > kernel BUG at /home/benh/linux-powerpc-test/block/cfq-iosched.c:3145! > cpu 0x3c: Vector: 700 (Program Check) at [c000003ca69bb190] > pc: c00000000033b05c: .cfq_dispatch_requests+0x90/0x99c > lr: c00000000033b038: .cfq_dispatch_requests+0x6c/0x99c > sp: c000003ca69bb410 > msr: 9000000000029032 > current = 0xc000003ca63d32a0 > paca = 0xc00000000ffef000 softe: 0 irq_happened: 0x01 > pid = 3487, comm = smartd > kernel BUG at /home/benh/linux-powerpc-test/block/cfq-iosched.c:3145! > enter ? for help > [c000003ca69bb4c0] c00000000032000c .elv_drain_elevator+0x70/0xc8 > [c000003ca69bb540] c000000000320140 .__elv_add_request+0xdc/0x27c > [c000003ca69bb5e0] c0000000003286f8 .blk_execute_rq_nowait+0xc0/0xf8 > [c000003ca69bb670] c0000000003287ec .blk_execute_rq+0xbc/0xe8 > [c000003ca69bb810] c000000000332350 .sg_io+0x218/0x39c > [c000003ca69bb930] c000000000332c3c .scsi_cmd_ioctl+0x270/0x4ac > [c000003ca69bba70] c0000000005d559c .sd_ioctl+0xa4/0xd8 > [c000003ca69bbb20] c00000000032eb1c .__blkdev_driver_ioctl+0x34/0x54 > [c000003ca69bbb90] c00000000032f83c .blkdev_ioctl+0x7b8/0x850 > [c000003ca69bbc40] c00000000018d6e0 .block_ioctl+0x4c/0x60 > [c000003ca69bbcb0] c0000000001691cc .do_vfs_ioctl+0x5cc/0x670 > [c000003ca69bbd90] c0000000001692b4 .SyS_ioctl+0x44/0x70 > [c000003ca69bbe30] c00000000000a024 syscall_exit+0x0/0x98 > --- Exception: c00 (System Call) at 00003fffb5240ee0 > > The storage driver is our usual IBM "IPR". > > Is that a known issue ? Nope, that's not a known issue. This must be related to the FIFO changes... How reproducible is this? -- Jens Axboe