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WARNING: CPU: 0 PID: 17031 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: 17031 Comm: kworker/0:7 Not tainted 5.8.0-rc5-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+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:542
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 a2 dc dc fd e8 9d dc dc fd <0f> 0b eb c2 4c 89 e7 e8 21 41 1c fe eb dc e8 9a 40 1c fe eb aa 4c
RSP: 0018:ffffc90007a3fca0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880398ee000 RCX: ffffffff8396dcfd
RDX: ffff88804b9d0280 RSI: ffffffff8396dd63 RDI: ffff8880398ee018
RBP: 0000607f516bfd30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880398ee008
R13: ffff8880398ee1a8 R14: 1ffff1100731dc20 R15: ffff8880398ee000
 io_ring_ctx_free fs/io_uring.c:7356 [inline]
 io_ring_exit_work+0x4b2/0x750 fs/io_uring.c:7421
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Kernel Offset: disabled
Rebooting in 86400 seconds..