------------[ cut here ]------------ percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free! WARNING: CPU: 0 PID: 7801 at lib/percpu-refcount.c:335 percpu_ref_kill_and_confirm+0x341/0x3b0 lib/percpu-refcount.c:335 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7801 Comm: syz-executor437 Not tainted 5.1.0-rc5+ #77 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+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x45 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:percpu_ref_kill_and_confirm+0x341/0x3b0 lib/percpu-refcount.c:335 Code: 42 e0 2a 06 01 48 89 fa 48 c1 ea 03 80 3c 02 00 75 76 49 8b 54 24 10 48 c7 c6 a0 71 a1 87 48 c7 c7 40 71 a1 87 e8 ad 92 13 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 RSP: 0018:ffff88808d8c7ce0 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000607f5142f833 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815afcf6 RDI: ffffed1011b18f8e RBP: ffff88808d8c7d10 R08: ffff88808caa4380 R09: fffffbfff1133639 R10: fffffbfff1133638 R11: ffffffff8899b1c3 R12: ffff88808f556a00 R13: ffff88808f556a08 R14: 0000000000000286 R15: 0000000000000000 percpu_ref_kill include/linux/percpu-refcount.h:128 [inline] __io_uring_register+0xa7/0x1fe0 fs/io_uring.c:2937 __do_sys_io_uring_register fs/io_uring.c:2998 [inline] __se_sys_io_uring_register fs/io_uring.c:2980 [inline] __ia32_sys_io_uring_register+0x193/0x1f0 fs/io_uring.c:2980 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f13869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f7eee1ec EFLAGS: 00000296 ORIG_RAX: 00000000000001ab RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..