------------[ cut here ]------------
WARNING: CPU: 1 PID: 25306 at lib/percpu-refcount.c:113 __percpu_ref_exit+0x30/0x54 lib/percpu-refcount.c:113
Modules linked in:
CPU: 1 PID: 25306 Comm: kworker/u4:1 Not tainted 5.12.0-rc8-syzkaller-00004-g1fe5501ba1ab #0
Hardware name: linux,dummy-virt (DT)
Workqueue: events_unbound io_ring_exit_work
pstate: 00400009 (nzcv daif +PAN -UAO -TCO BTYPE=--)
pc : __percpu_ref_exit+0x30/0x54 lib/percpu-refcount.c:113
lr : percpu_ref_exit+0x20/0x6c lib/percpu-refcount.c:134
sp : ffff8000145d3c90
x29: ffff8000145d3c90 x28: f4ff000020b6f5d0 
x27: ffff800011d01f38 x26: f4ff000020b6f410 
x25: f4ff000020b6f0c0 x24: f4ff000020b6f5b0 
x23: f4ff000020b6f000 x22: ffff8000126b7980 
x21: f9ff000005d82000 x20: f2ff00001baa7c00 
x19: f4ff000020b6f000 x18: 0000000000000014 
x17: 000000003a46b6a8 x16: 00000000135ef6fa 
x15: 00002dd58353a644 x14: 0000000000000000 
x13: 0000000000000030 x12: 0101010101010101 
x11: 7f7f7f7f7f7f7f7f x10: f6ff00001abd1000 
x9 : 0000000000507415 x8 : 0000000080000000 
x7 : ffff00007fbf95c0 x6 : ffff800012933400 
x5 : 00000000f0000000 x4 : fffffc000023c008 
x3 : 0000000000000001 x2 : ffff00007fbf9680 
x1 : ffff800010550100 x0 : 00007bff82a27108 
Call trace:
 __percpu_ref_exit+0x30/0x54 lib/percpu-refcount.c:113
 percpu_ref_exit+0x20/0x6c lib/percpu-refcount.c:134
 io_ring_ctx_free fs/io_uring.c:8483 [inline]
 io_ring_exit_work+0x370/0x540 fs/io_uring.c:8620
 process_one_work+0x1d8/0x364 kernel/workqueue.c:2275
 worker_thread+0x70/0x434 kernel/workqueue.c:2421
 kthread+0x174/0x180 kernel/kthread.c:292
 ret_from_fork+0x10/0x34 arch/arm64/kernel/entry.S:960
---[ end trace 4397bc8c709f35dd ]---