------------[ cut here ]------------
WARNING: CPU: 0 PID: 89 at lib/percpu-refcount.c:113 __percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113
Modules linked in:
CPU: 0 PID: 89 Comm: kworker/u17:3 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events_unbound io_ring_exit_work
RIP: 0010:__percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113
Code: fd 49 8d 7c 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 61 49 83 7c 24 10 00 74 07 e8 98 e3 b0 fd <0f> 0b e8 91 e3 b0 fd 48 89 ef e8 09 29 e0 fd 48 89 da 48 b8 00 00
RSP: 0018:ffffc90000877c98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888045a4a000 RCX: 0000000000000000
RDX: ffff888012a0e240 RSI: ffffffff83c275a8 RDI: ffff8880150f2a90
RBP: 0000607f810b9168 R08: 0000000000000000 R09: ffffffff8fac5987
R10: ffffffff83c27548 R11: 0000000000000009 R12: ffff8880150f2a80
R13: ffff888076c00000 R14: ffff8880150f2a80 R15: ffff8880111b0000
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc943da718 CR3: 000000006fa0c000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 percpu_ref_exit+0x3b/0x140 lib/percpu-refcount.c:134
 io_ring_ctx_free fs/io_uring.c:8445 [inline]
 io_ring_exit_work+0x2e9/0x4a0 fs/io_uring.c:8552
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294