From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=FORGED_MUA_MOZILLA, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98D7BC2BA17 for ; Fri, 3 Apr 2020 11:34:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FFD52073B for ; Fri, 3 Apr 2020 11:34:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390673AbgDCLeT (ORCPT ); Fri, 3 Apr 2020 07:34:19 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:34172 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728066AbgDCLeT (ORCPT ); Fri, 3 Apr 2020 07:34:19 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 033BXNhi098487 for ; Fri, 3 Apr 2020 07:34:17 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 3022r2d8y1-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 03 Apr 2020 07:34:17 -0400 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 3 Apr 2020 12:33:59 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 033BYCSo55705780 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 3 Apr 2020 11:34:12 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E51BCAE051; Fri, 3 Apr 2020 11:34:11 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6ECFFAE045; Fri, 3 Apr 2020 11:34:10 +0000 (GMT) Received: from localhost.localdomain (unknown [9.79.188.92]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 3 Apr 2020 11:34:10 +0000 (GMT) Subject: Re: spontaneous crash with "ext4: move ext4 bmap to use iomap infrastructure" To: Qian Cai Cc: Jan Kara , "Darrick J. Wong" , linux-ext4@vger.kernel.org, LKML , "Theodore Ts'o" References: <0024FD7B-D28A-4158-B9F8-76FDD6E6CF98@lca.pw> From: Ritesh Harjani Date: Fri, 3 Apr 2020 17:04:09 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <0024FD7B-D28A-4158-B9F8-76FDD6E6CF98@lca.pw> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20040311-0008-0000-0000-00000369AFCF X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20040311-0009-0000-0000-00004A8B3F52 Message-Id: <20200403113410.6ECFFAE045@d06av26.portsmouth.uk.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-03_07:2020-04-02,2020-04-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 impostorscore=0 suspectscore=27 adultscore=0 clxscore=1015 bulkscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004030101 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/3/20 4:56 PM, Qian Cai wrote: > > >> On Apr 1, 2020, at 8:38 AM, Qian Cai wrote: >> >> It is not always reproducible so far, but it start to show up on today’s linux-next. Look >> Trough the commits and noticed this recent one matched the new call traces, >> >> ac58e4fb03f9 (“ext4: move ext4 bmap to use iomap infrastructure") >> >> Thought? > > FYI, this starts to become more reproducible that happens again with today’s linux-next as well. Do you have the crash dump and vmlinux for this crash pls? Could you share it somehow with me. I tried reproducing this (fallocate04) for more than 6000 iterations. But I couldn't see this on my setup. Let me try it again with today's linux-next. -ritesh > > [ 375.277947][T13110] LTP: starting fallocate04 > [ 375.892545][T27575] /dev/zero: Can't open blockdev > [ 376.899021][T27575] EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem > [ 376.905283][T27575] BUG: Unable to handle kernel instruction fetch (NULL pointer?) > [ 376.905308][T27575] Faulting instruction address: 0x00000000 > [ 376.905333][T27575] Oops: Kernel access of bad area, sig: 11 [#1] > [ 376.905346][T27575] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV > [ 376.905371][T27575] Modules linked in: ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci tg3 mdio libahci libphy libata firmware_class dm_mirror dm_region_hash dm_log dm_mod > [ 376.905419][T27575] CPU: 64 PID: 27575 Comm: fallocate04 Tainted: G W L 5.6.0-next-20200403+ #347 > [ 376.905456][T27575] NIP: 0000000000000000 LR: c008000010b90048 CTR: 0000000000000000 > [ 376.905479][T27575] REGS: c000200aaeb0f3b0 TRAP: 0400 Tainted: G W L (5.6.0-next-20200403+) > [ 376.905513][T27575] MSR: 900000004280b033 CR: 42022228 XER: 20040000 > [ 376.905545][T27575] CFAR: c008000010bfc494 IRQMASK: 0 > [ 376.905545][T27575] GPR00: c0000000005af3b8 c000200aaeb0f640 c00000000165ce00 c000201aa7924ec0 > [ 376.905545][T27575] GPR04: 0000000000000000 0000000000000400 0000000000000000 0000000000000000 > [ 376.905545][T27575] GPR08: c000200aaeb0f678 c008000010b90040 000000007fffffff c00000000163c580 > [ 376.905545][T27575] GPR12: 0000000000000000 c000201fff7fb380 0000000000000000 0000000000000002 > [ 376.905545][T27575] GPR16: 0000000000000002 0000000000040001 c000201bd4ee4000 c000201bd4ee4548 > [ 376.905545][T27575] GPR20: c0000000015fbd18 c00000000168c654 c000200aaeb0f7a8 c0000000005b7bf0 > [ 376.905545][T27575] GPR24: 0000000000000000 c008000010c065b8 c000201aa7924ec0 0000000000000400 > [ 376.905545][T27575] GPR28: c00000000168c3a8 0000000000000000 0000000000000000 0000000000000000 > [ 376.905768][T27575] NIP [0000000000000000] 0x0 > [ 376.905798][T27575] LR [c008000010b90048] ext4_iomap_end+0x8/0x30 [ext4] > [ 376.905820][T27575] Call Trace: > [ 376.905844][T27575] [c000200aaeb0f640] [c0000000005af37c] iomap_apply+0x20c/0x920 (unreliable) > [ 376.905870][T27575] [c000200aaeb0f780] [c0000000005b7abc] iomap_bmap+0xfc/0x160 > [ 376.905911][T27575] [c000200aaeb0f7e0] [c008000010b92c1c] ext4_bmap+0xa4/0x180 [ext4] > [ 376.905937][T27575] [c000200aaeb0f820] [c0000000004fa22c] bmap+0x4c/0x80 > [ 376.905962][T27575] [c000200aaeb0f850] [c00800000fcf0acc] jbd2_journal_init_inode+0x44/0x1a0 [jbd2] > [ 376.906005][T27575] [c000200aaeb0f8f0] [c008000010bec808] ext4_load_journal+0x440/0x860 [ext4] > [ 376.906059][T27575] [c000200aaeb0f9c0] [c008000010bf2a14] ext4_fill_super+0x342c/0x3ab0 [ext4] > [ 376.906086][T27575] [c000200aaeb0fb30] [c0000000004ce0ec] mount_bdev+0x25c/0x290 > [ 376.906107][T27575] [c000200aaeb0fbd0] [c008000010be0250] ext4_mount+0x28/0x50 [ext4] > [ 376.906143][T27575] [c000200aaeb0fbf0] [c0000000005353cc] legacy_get_tree+0x4c/0xb0 > [ 376.906177][T27575] [c000200aaeb0fc20] [c0000000004cb67c] vfs_get_tree+0x4c/0x130 > [ 376.906213][T27575] [c000200aaeb0fc90] [c00000000050d1f8] do_mount+0xa18/0xc50 > [ 376.906257][T27575] [c000200aaeb0fd60] [c00000000050d9d8] sys_mount+0x158/0x180 > [ 376.906307][T27575] [c000200aaeb0fdb0] [c00000000003cc30] system_call_exception+0x110/0x1e0 > [ 376.906334][T27575] [c000200aaeb0fe20] [c00000000000c9f0] system_call_common+0xf0/0x278 > [ 376.906367][T27575] Instruction dump: > [ 376.906387][T27575] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX > [ 376.906434][T27575] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX > [ 376.906472][T27575] ---[ end trace fa91408cebc70be1 ]--- > [ 377.389381][T27575] > [ 378.389480][T27575] Kernel panic - not syncing: Fatal exception > [ 379.824028][ > >> >> [ 206.744625][T13224] LTP: starting fallocate04 >> [ 207.601583][T27684] /dev/zero: Can't open blockdev >> [ 208.674301][T27684] EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem >> [ 208.680347][T27684] BUG: Unable to handle kernel instruction fetch (NULL pointer?) >> [ 208.680383][T27684] Faulting instruction address: 0x00000000 >> [ 208.680406][T27684] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 208.680439][T27684] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=256 DEBUG_PAGEALLOC NUMA PowerNV >> [ 208.680474][T27684] Modules linked in: ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci mdio tg3 libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod >> [ 208.680576][T27684] CPU: 117 PID: 27684 Comm: fallocate04 Tainted: G W 5.6.0-next-20200401+ #288 >> [ 208.680614][T27684] NIP: 0000000000000000 LR: c0080000102c0048 CTR: 0000000000000000 >> [ 208.680657][T27684] REGS: c000200361def420 TRAP: 0400 Tainted: G W (5.6.0-next-20200401+) >> [ 208.680700][T27684] MSR: 900000004280b033 CR: 42022228 XER: 20040000 >> [ 208.680760][T27684] CFAR: c00800001032c494 IRQMASK: 0 >> [ 208.680760][T27684] GPR00: c0000000005ac3f8 c000200361def6b0 c00000000165c200 c00020107dae0bd0 >> [ 208.680760][T27684] GPR04: 0000000000000000 0000000000000400 0000000000000000 0000000000000000 >> [ 208.680760][T27684] GPR08: c000200361def6e8 c0080000102c0040 000000007fffffff c000000001614e80 >> [ 208.680760][T27684] GPR12: 0000000000000000 c000201fff671280 0000000000000000 0000000000000002 >> [ 208.680760][T27684] GPR16: 0000000000000002 0000000000040001 c00020030f5a1000 c00020030f5a1548 >> [ 208.680760][T27684] GPR20: c0000000015fbad8 c00000000168c654 c000200361def818 c0000000005b4c10 >> [ 208.680760][T27684] GPR24: 0000000000000000 c0080000103365b8 c00020107dae0bd0 0000000000000400 >> [ 208.680760][T27684] GPR28: c00000000168c3a8 0000000000000000 0000000000000000 0000000000000000 >> [ 208.681014][T27684] NIP [0000000000000000] 0x0 >> [ 208.681065][T27684] LR [c0080000102c0048] ext4_iomap_end+0x8/0x30 [ext4] >> [ 208.681091][T27684] Call Trace: >> [ 208.681129][T27684] [c000200361def6b0] [c0000000005ac3bc] iomap_apply+0x20c/0x920 (unreliable) >> iomap_apply at fs/iomap/apply.c:80 (discriminator 4) >> [ 208.681173][T27684] [c000200361def7f0] [c0000000005b4adc] iomap_bmap+0xfc/0x160 >> iomap_bmap at fs/iomap/fiemap.c:142 >> [ 208.681228][T27684] [c000200361def850] [c0080000102c2c1c] ext4_bmap+0xa4/0x180 [ext4] >> ext4_bmap at fs/ext4/inode.c:3213 >> [ 208.681260][T27684] [c000200361def890] [c0000000004f71fc] bmap+0x4c/0x80 >> [ 208.681281][T27684] [c000200361def8c0] [c00800000fdb0acc] jbd2_journal_init_inode+0x44/0x1a0 [jbd2] >> jbd2_journal_init_inode at fs/jbd2/journal.c:1255 >> [ 208.681326][T27684] [c000200361def960] [c00800001031c808] ext4_load_journal+0x440/0x860 [ext4] >> [ 208.681371][T27684] [c000200361defa30] [c008000010322a14] ext4_fill_super+0x342c/0x3ab0 [ext4] >> [ 208.681414][T27684] [c000200361defba0] [c0000000004cb0bc] mount_bdev+0x25c/0x290 >> [ 208.681478][T27684] [c000200361defc40] [c008000010310250] ext4_mount+0x28/0x50 [ext4] >> [ 208.681520][T27684] [c000200361defc60] [c00000000053242c] legacy_get_tree+0x4c/0xb0 >> [ 208.681556][T27684] [c000200361defc90] [c0000000004c864c] vfs_get_tree+0x4c/0x130 >> [ 208.681593][T27684] [c000200361defd00] [c00000000050a1c8] do_mount+0xa18/0xc50 >> [ 208.681641][T27684] [c000200361defdd0] [c00000000050a9a8] sys_mount+0x158/0x180 >> [ 208.681679][T27684] [c000200361defe20] [c00000000000b3f8] system_call+0x5c/0x68 >> [ 208.681726][T27684] Instruction dump: >> [ 208.681747][T27684] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX >> [ 208.681797][T27684] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX >> [ 208.681839][T27684] ---[ end trace 4e9e2bab7f1d4048 ]--- >> [ 208.802259][T27684] >> [ 209.802373][T27684] Kernel panic - not syncing: Fatal exception >