From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-f70.google.com ([209.85.166.70]:55326 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726558AbeKGOar (ORCPT ); Wed, 7 Nov 2018 09:30:47 -0500 Received: by mail-io1-f70.google.com with SMTP id y14-v6so13603221ioa.22 for ; Tue, 06 Nov 2018 21:02:03 -0800 (PST) MIME-Version: 1.0 Date: Tue, 06 Nov 2018 21:02:03 -0800 Message-ID: <000000000000da5443057a0c047e@google.com> Subject: general protection fault in locks_remove_flock From: syzbot To: bfields@fieldses.org, jlayton@kernel.org, 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 List-ID: Hello, syzbot found the following crash on: HEAD commit: d881de30d29e Add linux-next specific files for 20181107 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1594d983400000 kernel config: https://syzkaller.appspot.com/x/.config?x=caa433e1c8778437 dashboard link: https://syzkaller.appspot.com/bug?extid=2400c924363a9a43d116 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+2400c924363a9a43d116@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13218 Comm: syz-executor3 Not tainted 4.20.0-rc1-next-20181107+ #107 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567 Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40 RSP: 0018:ffff8801895a7880 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb RBP: ffff8801895a7a60 R08: ffff880194096140 R09: ffffed003b5c5b67 R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801cb266ac0 R13: ffff8801895a78f8 R14: 1ffff100312b4f13 R15: dffffc0000000000 FS: 0000000002927940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000400200 CR3: 00000001bd0d5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: locks_remove_file+0x148/0x5c0 fs/locks.c:2607 __fput+0x2f0/0xa70 fs/file_table.c:271 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411021 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffe309feb50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000411021 RDX: 0000000000000000 RSI: 0000000000730420 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffe309fea70 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000010d R15: 0000000000000003 Modules linked in: ---[ end trace 69f886046d36502a ]--- RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567 kasan: CONFIG_KASAN_INLINE enabled Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40 kasan: GPF could be caused by NULL-ptr deref or user memory access RSP: 0018:ffff8801895a7880 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d kasan: CONFIG_KASAN_INLINE enabled RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb RBP: ffff8801895a7a60 R08: ffff880194096140 R09: ffffed003b5c5b67 R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801cb266ac0 kasan: GPF could be caused by NULL-ptr deref or user memory access R13: ffff8801895a78f8 R14: 1ffff100312b4f13 R15: dffffc0000000000 FS: 0000000002927940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000072c000 CR3: 00000001bd0d5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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.