------------[ cut here ]------------
WARNING: CPU: 1 PID: 195 at lib/percpu-refcount.c:113 __percpu_ref_exit+0x98/0x100 lib/percpu-refcount.c:113
Modules linked in:
CPU: 1 PID: 195 Comm: kworker/u4:4 Not tainted 5.12.0-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:__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 48 01 a9 fd <0f> 0b e8 41 01 a9 fd 48 89 ef e8 49 fa d7 fd 48 89 da 48 b8 00 00
RSP: 0018:ffffc9000173fb48 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888025a00000 RCX: 0000000000000000
RDX: ffff888012829c40 RSI: ffffffff83cae268 RDI: ffff888013761e90
RBP: 0000607f4608eff8 R08: 0000000000000000 R09: ffffffff9019c99f
R10: ffffffff83cae208 R11: 0000000000000009 R12: ffff888013761e80
R13: 000000010000dc47 R14: ffff888013761e80 R15: ffff888025a008b0
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e2ec321090 CR3: 0000000014f8b000 CR4: 00000000001506e0
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:8483 [inline]
 io_ring_exit_work+0xa64/0x12d0 fs/io_uring.c:8620
 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