linux-kernel - WARNING in io_ring_ctx_wait_and

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Message-ID: <00000000000003aab005b8c5b9ac@google.com>
Date:   Wed, 13 Jan 2021 02:37:15 -0800
From:   syzbot <syzbot+9c9c35374c0ecac06516@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: WARNING in io_ring_ctx_wait_and_kill

Hello,

syzbot found the following issue on:

HEAD commit:    7c53f6b6 Linux 5.11-rc3
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=115280af500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c60c9ff9cc916cbc
dashboard link: https://syzkaller.appspot.com/bug?extid=9c9c35374c0ecac06516
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16286007500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=107fc7fb500000

The issue was bisected to:

commit d9d05217cb6990b9a56e13b56e7a1b71e2551f6c
Author: Pavel Begunkov <asml.silence@...il.com>
Date:   Fri Jan 8 20:57:25 2021 +0000

    io_uring: stop SQPOLL submit on creator's death

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=135aeb0b500000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10daeb0b500000
console output: https://syzkaller.appspot.com/x/log.txt?x=175aeb0b500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9c9c35374c0ecac06516@...kaller.appspotmail.com
Fixes: d9d05217cb69 ("io_uring: stop SQPOLL submit on creator's death")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 8494 at fs/io_uring.c:8717 io_ring_ctx_wait_and_kill+0x4f2/0x600 fs/io_uring.c:8717
Modules linked in:
CPU: 0 PID: 8494 Comm: syz-executor170 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_ring_ctx_wait_and_kill+0x4f2/0x600 fs/io_uring.c:8717
Code: 0f 85 23 01 00 00 48 8b ab 68 01 00 00 be 08 00 00 00 48 8d 7d 50 e8 8d 29 db ff f0 4c 29 65 50 e9 80 fd ff ff e8 0e 6a 98 ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 0f b6 04
RSP: 0018:ffffc9000160fe38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888014c83000 RCX: 0000000000000000
RDX: ffff888020309bc0 RSI: ffffffff81da5fb2 RDI: 0000000000000003
RBP: ffff888014c83044 R08: 0000000000000002 R09: ffffffff8ed30867
R10: ffffffff81da5b2d R11: 0000000000000000 R12: 0000000000000002
R13: ffff888014c83040 R14: ffff888014c83380 R15: ffff88802e2ea000
FS:  0000000002167880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f69433e31f0 CR3: 0000000017b77000 CR4: 0000000000350ef0
Call Trace:
 io_uring_release+0x3e/0x50 fs/io_uring.c:8759
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4402c9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffca0848378 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffe8 RBX: 00000000004002c8 RCX: 00000000004402c9
RDX: 00000000004402c9 RSI: 0000000020000040 RDI: 0000000000002094
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ad0
R13: 0000000000401b60 R14: 0000000000000000 R15: 0000000000000000


---
This report 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@...glegroups.com.

syzbot will keep track of this issue. See:
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches