From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753788AbeDSQFF (ORCPT ); Thu, 19 Apr 2018 12:05:05 -0400 Received: from mail-it0-f69.google.com ([209.85.214.69]:33727 "EHLO mail-it0-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753768AbeDSQFC (ORCPT ); Thu, 19 Apr 2018 12:05:02 -0400 X-Google-Smtp-Source: AIpwx48u08epC/g/D1mbWjxR/+fvHdzi0x3ffTKgtb9sgg4QcEZ2Kf63wrYZsZKexW+r5OyH5Y3fennqdSErxgJQkODOIHpSnfx8 MIME-Version: 1.0 Date: Thu, 19 Apr 2018 09:05:01 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e563d7056a35bbb3@google.com> Subject: general protection fault in wb_workfn From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot hit the following crash on upstream commit 3eb2ce825ea1ad89d20f7a3b5780df850e4be274 (Sun Mar 25 22:44:30 2018 +0000) Linux 4.16-rc7 syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=9873874c735f2892e7e9 So far this crash happened 29 times on upstream. Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6617474409693184 Kernel config: https://syzkaller.appspot.com/x/.config?id=-8440362230543204781 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9873874c735f2892e7e9@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 28 Comm: kworker/u4:2 Not tainted 4.16.0-rc7+ #368 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn RIP: 0010:dev_name include/linux/device.h:981 [inline] RIP: 0010:wb_workfn+0x1a2/0x16b0 fs/fs-writeback.c:1936 RSP: 0018:ffff8801d951f038 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81bf6ea5 RDX: 000000000000000a RSI: ffffffff87b44840 RDI: 0000000000000050 RBP: ffff8801d951f558 R08: 1ffff1003b2a3def R09: 0000000000000004 R10: ffff8801d951f438 R11: 0000000000000004 R12: 0000000000000100 R13: ffff8801baee0dc0 R14: ffff8801d951f530 R15: ffff8801baee10d8 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000047ff80 CR3: 0000000007a22006 CR4: 00000000001626f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 process_scheduled_works kernel/workqueue.c:2173 [inline] worker_thread+0xa4b/0x1990 kernel/workqueue.c:2252 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 d9 14 00 00 48 8b 9b d0 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a9 14 00 00 4c 8b 63 50 4d 85 e4 0f 84 49 0e RIP: dev_name include/linux/device.h:981 [inline] RSP: ffff8801d951f038 RIP: wb_workfn+0x1a2/0x16b0 fs/fs-writeback.c:1936 RSP: ffff8801d951f038 ---[ end trace 303e9927650f10c6 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.