[syzbot] WARNING in io_wqe_enqueue

syzbot
2021-06-04T09:11:25Z

Hello,

syzbot found the following issue on:

HEAD commit: f88cd3fb Merge tag 'vfio-v5.13-rc5' of git://github.com/aw..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=175c1577d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=82d85e75046e5e64
dashboard link: https://syzkaller.appspot.com/bug?extid=ea2f1484cffe5109dc10

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ea2f1484cffe5109dc10@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 11749 at fs/io-wq.c:244 io_wqe_wake_worker fs/io-wq.c:244 [inline]
WARNING: CPU: 1 PID: 11749 at fs/io-wq.c:244 io_wqe_enqueue+0x7f6/0x910 fs/io-wq.c:751
Modules linked in:
CPU: 1 PID: 11749 Comm: syz-executor.0 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:io_wqe_wake_worker fs/io-wq.c:244 [inline]
RIP: 0010:io_wqe_enqueue+0x7f6/0x910 fs/io-wq.c:751
Code: ef e8 3e a3 d8 ff e9 2d f9 ff ff 4c 89 ef e8 31 a3 d8 ff e9 53 f9 ff ff 48 89 ef e8 24 a3 d8 ff e9 9f fa ff ff e8 aa 1a 94 ff <0f> 0b e9 08 fb ff ff 48 8b 7c 24 08 e8 19 a3 d8 ff e9 ca fd ff ff
RSP: 0018:ffffc90000e3fc78 EFLAGS: 00010212
RAX: 0000000000003811 RBX: 0000000000000001 RCX: ffffc90001639000
RDX: 0000000000040000 RSI: ffffffff81dff6b6 RDI: 0000000000000003
RBP: ffff88801494a810 R08: 0000000000000000 R09: ffff88801494a8a3
R10: ffffffff81dff1bc R11: 0000000000000002 R12: ffff88801494a800
R13: ffff88801494a898 R14: ffff88801494a8e8 R15: 0000000000000000
FS: 00007fe134468700(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000040c0e0 CR3: 0000000072963000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
io_queue_async_work+0x2d0/0x5f0 fs/io_uring.c:1274
__io_queue_sqe+0x806/0x10f0 fs/io_uring.c:6438
__io_req_task_submit+0x103/0x120 fs/io_uring.c:2039
io_async_task_func+0x23e/0x4c0 fs/io_uring.c:5074
__tctx_task_work fs/io_uring.c:1910 [inline]
tctx_task_work+0x24e/0x550 fs/io_uring.c:1924
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_signal include/linux/tracehook.h:212 [inline]
handle_signal_work kernel/entry/common.c:145 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x24a/0x280 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe134468188 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: 0000000000000000 RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe2f2a5b4f R14: 00007fe134468300 R15: 0000000000022000

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