From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753743AbYLZRgY (ORCPT ); Fri, 26 Dec 2008 12:36:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752554AbYLZRgO (ORCPT ); Fri, 26 Dec 2008 12:36:14 -0500 Received: from verein.lst.de ([213.95.11.210]:42461 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752480AbYLZRgO (ORCPT ); Fri, 26 Dec 2008 12:36:14 -0500 Date: Fri, 26 Dec 2008 18:36:06 +0100 From: Christoph Hellwig To: axboe@oracle.com, linux-kernel@vger.kernel.org, linux-mm@vger.kernel.org Subject: oops in __bounce_end_io_read under kvm Message-ID: <20081226173606.GA14933@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i X-Spam-Score: 0 () Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I've been gettings oopsens from a a virtio_blk callchain when running xfsqa under kvm on a virtio devices frequently but not easily reproducibly. The VM has 1.2 GB of memory and thus highmem enabled, but I don't really understand why we bounce buffer in the guest. The callstack looks like this: [ 898.476526] BUG: unable to handle kernel paging request at fffba200 [ 898.480159] IP: [] __bounce_end_io_read+0xd4/0x130 [ 898.480159] *pde = 00008067 *pte = 00000000 [ 898.480159] Oops: 0002 [#1] SMP [ 898.480159] last sysfs file: /sys/class/net/lo/operstate [ 898.480159] Modules linked in: [ 898.480159] [ 898.480159] Pid: 2062, comm: xfs_repair Not tainted (2.6.28-rc9-xfs #23) [ 898.480159] EIP: 0060:[] EFLAGS: 00010086 CPU: 0 [ 898.480159] EIP is at __bounce_end_io_read+0xd4/0x130 [ 898.480159] EAX: fffba000 EBX: 00000000 ECX: 00000380 EDX: 00000e00 [ 898.480159] ESI: ea5fb200 EDI: fffba200 EBP: f4f8fda0 ESP: f4f8fd74 [ 898.480159] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 898.480159] Process xfs_repair (pid: 2062, ti=f4f8e000 task=f6ad0070 task.ti=f4f8e000) [ 898.480159] Stack: [ 898.480159] 00000380 00000000 f6bf3718 f706a8d8 f706ae20 00000000 f7066578 00000086 [ 898.480159] c01a7ca0 00000000 00000000 f4f8fda8 c01a7cb0 f4f8fdb4 c01dad1d f706a8d8 [ 898.480159] f4f8fdd8 c05117e9 f4f8fdd8 00000046 00000001 00000046 f706a8d8 00001000 [ 898.480159] Call Trace: [ 898.480159] [] ? bounce_end_io_read+0x0/0x20 [ 898.480159] [] ? bounce_end_io_read+0x10/0x20 [ 898.480159] [] ? bio_endio+0x1d/0x40 [ 898.480159] [] ? req_bio_endio+0x89/0xe0 [ 898.480159] [] ? __end_that_request_first+0x72/0x2b0 [ 898.480159] [] ? __end_that_request_first+0x195/0x2b0 [ 898.480159] [] ? __blk_end_request+0x1f/0x50 [ 898.480159] [] ? blk_done+0x4d/0x90 [ 898.480159] [] ? vring_interrupt+0x2a/0x40 [ 898.480159] [] ? vp_interrupt+0x72/0xb0 [ 898.480159] [] ? handle_IRQ_event+0x29/0x60 [ 898.480159] [] ? handle_fasteoi_irq+0x62/0xd0 [ 898.480159] [] ? do_IRQ+0x8e/0xc0 [ 898.480159] [] ? common_interrupt+0x28/0x30 [ 898.480159] [] ? kobject_move+0x10b/0x120 [ 898.480159] [] ? paravirt_get_lazy_mode+0xf/0x20 [ 898.480159] [] ? kvm_leave_lazy_mmu+0x63/0x80 [ 898.480159] [] ? mprotect_fixup+0x2b1/0x400 [ 898.480159] [] ? sys_mprotect+0x14c/0x1d0 [ 898.480159] [] ? syscall_call+0x7/0xb [ 898.480159] [] ? kvm_mmu_pte_write+0x270/0x970 [ 898.480159] Code: 4e fc ff 8b 55 ec 8b 04 1a 31 d2 e8 d7 6a f9 ff 8b 4d ec 8b 54 19 04 89 c7 89 d1 c1 e9 02 89 4d d4 8b 4d ec 03 7c 19 08 8b 4d d4 a5 89 d1 83 e1 03 74 02 f3 a4 31 d2 e8 fa 68 f9 ff f7 45 f0