------------[ cut here ]------------ WARNING: CPU: 0 PID: 8 at fs/io_uring.c:1164 req_ref_get fs/io_uring.c:1164 [inline] WARNING: CPU: 0 PID: 8 at fs/io_uring.c:1164 io_wq_submit_work+0x272/0x300 fs/io_uring.c:6733 Modules linked in: CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.14.0-next-20210907-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound io_ring_exit_work RIP: 0010:req_ref_get fs/io_uring.c:1164 [inline] RIP: 0010:io_wq_submit_work+0x272/0x300 fs/io_uring.c:6733 Code: e8 03 b4 92 ff 83 fb 7f 76 1b e8 b9 ac 92 ff be 04 00 00 00 4c 89 ef e8 bc d3 d8 ff f0 ff 45 a4 e9 41 fe ff ff e8 9e ac 92 ff <0f> 0b eb dc e8 95 ac 92 ff 4c 89 e7 e8 ed db fb ff 48 85 c0 49 89 RSP: 0018:ffffc90000cd78c0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 000000000000007f RCX: 0000000000000000 RDX: ffff888010e5d580 RSI: ffffffff81e360c2 RDI: 0000000000000003 RBP: ffff88807df4c478 R08: 000000000000007f R09: ffff88807df4c41f R10: ffffffff81e3609d R11: 0000000000000000 R12: ffff88807df4c3c0 R13: ffff88807df4c41c R14: ffff88807df4c418 R15: 0000000000100000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d92f000 CR3: 000000001df74000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_run_cancel fs/io-wq.c:809 [inline] io_acct_cancel_pending_work.isra.0+0x2a9/0x5e0 fs/io-wq.c:950 io_wqe_cancel_pending_work+0x6c/0x130 fs/io-wq.c:968 io_wq_cancel_cb+0x162/0x5d0 fs/io-wq.c:1003 io_uring_try_cancel_iowq fs/io_uring.c:9473 [inline] io_uring_try_cancel_requests+0x881/0xc30 fs/io_uring.c:9493 io_ring_exit_work+0x137/0x1980 fs/io_uring.c:9293 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295