------------[ cut here ]------------
WARNING: CPU: 1 PID: 225 at lib/percpu-refcount.c:113 __percpu_ref_exit lib/percpu-refcount.c:113 [inline]
WARNING: CPU: 1 PID: 225 at lib/percpu-refcount.c:113 percpu_ref_exit+0x1e0/0x1f0 lib/percpu-refcount.c:134
Modules linked in:
CPU: 0 PID: 225 Comm: kworker/u4:4 Not tainted 5.12.0-rc7-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 lib/percpu-refcount.c:113 [inline]
RIP: 0010:percpu_ref_exit+0x1e0/0x1f0 lib/percpu-refcount.c:134
Code: c7 c7 80 7a ce 8c 4c 89 e6 e8 1c 8a 80 05 48 8b 3c 24 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 f5 59 e8 fd e8 30 14 a5 fd <0f> 0b e9 d0 fe ff ff 66 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55
RSP: 0018:ffffc900012ffba0 EFLAGS: 00010293
RAX: ffffffff83d407a0 RBX: 0000607f4608ba48 RCX: ffff8880120c0000
RDX: 0000000000000000 RSI: 0000607f4608ba48 RDI: 0000000000000000
RBP: ffff888028f11380 R08: ffffffff83d40635 R09: fffffbfff1f270d5
R10: fffffbfff1f270d5 R11: 0000000000000000 R12: ffff888028f11390
R13: ffff88801a986000 R14: 1ffff11003530c00 R15: 1ffff11003530c01
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000970004 CR3: 0000000067b5e000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 io_ring_ctx_free fs/io_uring.c:8480 [inline]
 io_ring_exit_work+0xa52/0xf80 fs/io_uring.c:8617
 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275
 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294