------------[ cut here ]------------
WARNING: CPU: 0 PID: 3385 at lib/percpu-refcount.c:112 percpu_ref_exit+0xa3/0xd0 lib/percpu-refcount.c:112
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 3385 Comm: kworker/0:6 Not tainted 5.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events io_ring_exit_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x27b/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 fixup_bug arch/x86/kernel/traps.c:170 [inline]
 do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:percpu_ref_exit+0xa3/0xd0 lib/percpu-refcount.c:112
Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 1a 48 c7 43 08 03 00 00 00 5b 5d 41 5c e9 d2 66 dd fd e8 cd 66 dd fd <0f> 0b eb c2 4c 89 e7 e8 01 2e 1b fe eb dc e8 7a 2d 1b fe eb aa 4c
RSP: 0018:ffffc9000a0dfcc8 EFLAGS: 00010293
RAX: ffff88809c5da2c0 RBX: ffff888090b97000 RCX: ffffffff8395c75d
RDX: 0000000000000000 RSI: ffffffff8395c7c3 RDI: ffff888090b97018
RBP: 0000607f516bb628 R08: ffff88809c5da2c0 R09: fffffbfff185cd72
R10: ffffffff8c2e6b8f R11: fffffbfff185cd71 R12: ffff888090b97008
R13: ffff888090b971a8 R14: ffff888090b97100 R15: 0000000000000000
 io_ring_ctx_free fs/io_uring.c:7254 [inline]
 io_ring_exit_work+0x315/0x6a0 fs/io_uring.c:7313
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..