[syzbot] kernel BUG in io_queue_async_work

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    e2f74b13 Add linux-next specific files for 20210708
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14fc6fb4300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=59e1e3bbc3afca75
dashboard link: https://syzkaller.appspot.com/bug?extid=d50e4f20cfad4510ec22

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+d50e4f20cfad4510ec22@xxxxxxxxxxxxxxxxxxxxxxxxx

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kernel BUG at fs/io_uring.c:1293!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 18789 Comm: kworker/0:10 Not tainted 5.13.0-next-20210708-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events io_fallback_req_func
RIP: 0010:io_queue_async_work+0x539/0x5f0 fs/io_uring.c:1293
Code: 89 be 89 00 00 00 48 c7 c7 00 8a 9a 89 c6 05 28 5f 77 0b 01 e8 be e9 06 07 e9 6e ff ff ff e8 be 1e 95 ff 0f 0b e8 b7 1e 95 ff <0f> 0b e8 b0 1e 95 ff 0f 0b e9 1a fd ff ff e8 d4 2f db ff e9 47 fb
RSP: 0018:ffffc900032efba8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802840c800 RCX: 0000000000000000
RDX: ffff888082e09c80 RSI: ffffffff81e07d49 RDI: ffff8880224da498
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000043736500
R10: ffffffff81e222ff R11: 0000000000000000 R12: ffff8880782e78c0
R13: 0000000000000019 R14: ffff88802840c8b0 R15: ffff8880782e7918
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe2796bd8c CR3: 000000000b68e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __io_queue_sqe+0x913/0xf10 fs/io_uring.c:6444
 io_req_task_submit+0x100/0x120 fs/io_uring.c:2020
 io_fallback_req_func+0x81/0xb0 fs/io_uring.c:2437
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace 4d51acadba583174 ]---
RIP: 0010:io_queue_async_work+0x539/0x5f0 fs/io_uring.c:1293
Code: 89 be 89 00 00 00 48 c7 c7 00 8a 9a 89 c6 05 28 5f 77 0b 01 e8 be e9 06 07 e9 6e ff ff ff e8 be 1e 95 ff 0f 0b e8 b7 1e 95 ff <0f> 0b e8 b0 1e 95 ff 0f 0b e9 1a fd ff ff e8 d4 2f db ff e9 47 fb
RSP: 0018:ffffc900032efba8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802840c800 RCX: 0000000000000000
RDX: ffff888082e09c80 RSI: ffffffff81e07d49 RDI: ffff8880224da498
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000043736500
R10: ffffffff81e222ff R11: 0000000000000000 R12: ffff8880782e78c0
R13: 0000000000000019 R14: ffff88802840c8b0 R15: ffff8880782e7918
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3dee45e000 CR3: 000000002dd4e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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