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Sat, 26 May 2018 05:15:04 -0400 Received: from mail-it0-f70.google.com ([209.85.214.70]:39525 "EHLO mail-it0-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031380AbeEZJPD (ORCPT ); Sat, 26 May 2018 05:15:03 -0400 X-Google-Smtp-Source: ADUXVKLlJnoeU/bz5k4+F315zKABFnWJX2GbvqEpQvzYWHH8JlT4Rb63J3+yS56Rea7pTAj3UTyT8KRBJDCu97dl6c815nvjJ7Dv MIME-Version: 1.0 Date: Sat, 26 May 2018 02:15:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000cbd959056d1851ca@google.com> Subject: general protection fault in wb_workfn (2) 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-fsdevel-owner@vger.kernel.org X-Mailing-List: linux-fsdevel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Hello, syzbot found the following crash on: HEAD commit: 305bb5521282 Merge tag 'selinux-pr-20180516' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=153eb40f800000 kernel config: https://syzkaller.appspot.com/x/.config?x=f3b4e30da84ec1ed dashboard link: https://syzkaller.appspot.com/bug?extid=4a7438e774b21ddd8eca compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4a7438e774b21ddd8eca@syzkaller.appspotmail.com binder: 13169:13171 ioctl 40047459 20000000 returned -22 sock: process `syz-executor6' is using obsolete setsockopt SO_BSDCOMPAT binder: 13169:13202 Acquire 1 refcount change on invalid ref 0 ret -22 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: 1 PID: 88 Comm: kworker/u4:3 Not tainted 4.17.0-rc5+ #55 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:1008 [inline] RIP: 0010:wb_workfn+0x195/0x1740 fs/fs-writeback.c:1937 RSP: 0018:ffff8801d964f270 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff814e0f15 RDX: 000000000000000a RSI: ffffffff81cd221d RDI: 0000000000000050 RBP: ffff8801d964f750 R08: ffff8801d97c6700 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: 0000000000000001 R13: 1ffff1003b2c9f37 R14: ffff8801d964f728 R15: ffff8801d6836f18 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fec3a840db8 CR3: 00000001b49ae000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 process_scheduled_works kernel/workqueue.c:2205 [inline] worker_thread+0xa30/0x1440 kernel/workqueue.c:2284 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 ee 13 00 00 48 8b 9b 08 06 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 3f 14 00 00 4c 8b 63 50 4d 85 e4 0f 84 a9 0e RIP: dev_name include/linux/device.h:1008 [inline] RSP: ffff8801d964f270 RIP: wb_workfn+0x195/0x1740 fs/fs-writeback.c:1937 RSP: ffff8801d964f270 ---[ end trace baf4ced88bb756b8 ]--- --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.