Re: [syzbot] WARNING in io_try_cancel_userdata

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    46debfec12b4 Add linux-next specific files for 20210823
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12f00c39300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=49609005dc034be7
dashboard link: https://syzkaller.appspot.com/bug?extid=b0c9d1588ae92866515f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15830bee300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b0c9d1588ae92866515f@xxxxxxxxxxxxxxxxxxxxxxxxx

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WARNING: CPU: 0 PID: 7008 at fs/io_uring.c:6082 io_try_cancel_userdata+0x30d/0x540 fs/io_uring.c:6082
Modules linked in:
CPU: 0 PID: 7008 Comm: iou-wrk-7007 Not tainted 5.14.0-rc7-next-20210823-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_try_cancel_userdata+0x30d/0x540 fs/io_uring.c:6082
Code: 52 07 e8 66 67 95 ff 48 8b 3c 24 e8 ad 67 52 07 e9 71 fe ff ff e8 53 67 95 ff 41 bf 8e ff ff ff e9 61 fe ff ff e8 43 67 95 ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02
RSP: 0018:ffffc90003fefac0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801d064c80 RCX: 0000000000000000
RDX: ffff88801ea75580 RSI: ffffffff81e078fd RDI: ffff88801d064cd0
RBP: ffff88801ea75580 R08: ffffffff899adde0 R09: ffffffff81e1e4e4
R10: 0000000000000027 R11: 000000000000000e R12: 1ffff920007fdf59
R13: 0000000000012345 R14: ffff888146628000 R15: ffff88801d064ce0
FS:  00007f0c5b7d6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc3bfd8720 CR3: 0000000070d9c000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 io_async_cancel fs/io_uring.c:6122 [inline]
 io_issue_sqe+0x22d5/0x67b0 fs/io_uring.c:6515
 io_wq_submit_work+0x1d4/0x300 fs/io_uring.c:6619
 io_worker_handle_work+0x1584/0x1810 fs/io-wq.c:533
 io_wqe_worker+0x9cd/0xbb0 fs/io-wq.c:606
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295