------------[ cut here ]------------
WARNING: CPU: 0 PID: 12974 at lib/percpu-refcount.c:111 percpu_ref_exit+0xa3/0xd0 lib/percpu-refcount.c:111
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 12974 Comm: syz-executor.5 Not tainted 5.6.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [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:111
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 f9 e3 fd e8 9d f9 e3 fd <0f> 0b eb c2 4c 89 e7 e8 41 b7 20 fe eb dc e8 ba b6 20 fe eb aa 4c
RSP: 0018:ffffc9000820fd68 EFLAGS: 00010293
RAX: ffff8880420c23c0 RBX: ffff88809033a610 RCX: ffffffff838e195d
RDX: 0000000000000000 RSI: ffffffff838e19c3 RDI: ffff88809033a628
RBP: 0000607f516be978 R08: ffff8880420c23c0 R09: ffffed10120674ca
R10: ffffed10120674c9 R11: ffff88809033a64f R12: ffff88809033a618
R13: ffff888095028100 R14: ffff888095028000 R15: ffff8880950282a8
 io_sqe_files_unregister+0x8a/0x2f0 fs/io_uring.c:5344
 io_ring_ctx_free fs/io_uring.c:6338 [inline]
 io_ring_ctx_wait_and_kill+0x4bf/0xa20 fs/io_uring.c:6430
 io_uring_release+0x3e/0x50 fs/io_uring.c:6438
 __fput+0x2da/0x850 fs/file_table.c:280
 task_work_run+0x13f/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2fa/0x360 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x416041
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd843f6d00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416041
RDX: 0000001b30120000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 000000009a61d94f R09: 000000009a61d953
R10: 00007ffd843f6de0 R11: 0000000000000293 R12: 000000000076bf20
R13: 0000000000770868 R14: 00000000000569f9 R15: 000000000076bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..