------------[ cut here ]------------
WARNING: CPU: 0 PID: 16394 at lib/percpu-refcount.c:111 percpu_ref_exit+0xac/0xb0 lib/percpu-refcount.c:111
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 16394 Comm: syz-executor135 Not tainted 5.6.0-rc3-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+0x1fb/0x318 lib/dump_stack.c:118
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x209/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0xcf/0x1c0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:percpu_ref_exit+0xac/0xb0 lib/percpu-refcount.c:111
Code: 00 00 74 08 4c 89 f7 e8 c2 3b 14 fe 49 c7 06 03 00 00 00 eb 05 e8 a4 11 d7 fd 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 94 11 d7 fd <0f> 0b eb c6 55 48 89 e5 41 57 41 56 53 49 89 f6 48 89 fb e8 7c 11
RSP: 0018:ffffc90005387ad8 EFLAGS: 00010293
RAX: ffffffff83a007ec RBX: ffff8880a8d29228 RCX: ffff888091636240
RDX: 0000000000000000 RSI: 0000607f512362f0 RDI: 0000000000000000
RBP: ffffc90005387b00 R08: ffffffff83a0078b R09: ffffed10151a524a
R10: ffffed10151a524a R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff110151a5243 R14: ffff8880a8d29218 R15: 0000607f512362f0
 io_sqe_files_unregister+0x8d/0x290 fs/io_uring.c:5339
 io_ring_ctx_free fs/io_uring.c:6335 [inline]
 io_ring_ctx_wait_and_kill+0x2b9c/0x3250 fs/io_uring.c:6426
 io_uring_release+0x5d/0x70 fs/io_uring.c:6434
 __fput+0x2e4/0x740 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:313
 task_work_run+0x176/0x1b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x5f2/0x2000 kernel/exit.c:801
 do_group_exit+0x15c/0x2b0 kernel/exit.c:899
 __do_sys_exit_group+0x17/0x20 kernel/exit.c:910
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:908
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:908
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440008
Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00
RSP: 002b:00007fff19c9a7b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440008
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf830 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..