------------[ cut here ]------------ WARNING: CPU: 1 PID: 11575 at lib/percpu-refcount.c:111 percpu_ref_exit+0xab/0xd0 lib/percpu-refcount.c:111 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11575 Comm: syz-executor.5 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+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 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+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:percpu_ref_exit+0xab/0xd0 lib/percpu-refcount.c:111 Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 1d 48 c7 43 08 03 00 00 00 e8 31 6d d3 fd 5b 41 5c 41 5d 5d c3 e8 25 6d d3 fd <0f> 0b eb bf 4c 89 ef e8 69 13 12 fe eb d9 e8 c2 12 12 fe eb a7 4c RSP: 0018:ffffc90007167d10 EFLAGS: 00010293 RAX: ffff8880a05ce1c0 RBX: ffff88809ee96810 RCX: ffffffff83a229c2 RDX: 0000000000000000 RSI: ffffffff83a22a2b RDI: ffff88809ee96828 RBP: ffffc90007167d28 R08: ffff8880a05ce1c0 R09: ffffed1013dd2d0a R10: ffffed1013dd2d09 R11: ffff88809ee9684f R12: 0000607f514c5f60 R13: ffff88809ee96818 R14: ffff88809e9ce000 R15: ffff88809e9ce2a8 io_sqe_files_unregister+0x8f/0x2f0 fs/io_uring.c:5339 io_ring_ctx_free fs/io_uring.c:6335 [inline] io_ring_ctx_wait_and_kill+0x4ed/0xa60 fs/io_uring.c:6426 io_uring_release+0x42/0x50 fs/io_uring.c:6434 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 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+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416011 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:00007ffdd16af5a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416011 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 00ffffffffffffff R09: 00ffffffffffffff R10: 00007ffdd16af680 R11: 0000000000000293 R12: 000000000076bf20 R13: 0000000000770ab0 R14: 000000000001d76d R15: 000000000076bf2c Kernel Offset: disabled Rebooting in 86400 seconds..