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percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free!
WARNING: CPU: 0 PID: 8487 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: 8487 Comm: syz-executor.3 Not tainted 5.1.0-rc6+ #88
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: c3 d6 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 85 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:ffff88805375fcf0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000607f5147fc0b RCX: 0000000000000000
RDX: 0000000000008ddf RSI: ffffffff815afcf6 RDI: ffffed100a6ebf90
RBP: ffff88805375fd20 R08: ffff888053756400 R09: fffffbfff1133639
R10: fffffbfff1133638 R11: ffffffff8899b1c3 R12: ffff8880a9a21380
R13: ffff8880a9a21388 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]
 __x64_sys_io_uring_register+0x193/0x1f0 fs/io_uring.c:2980
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe7dc8bbc78 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458da9
RDX: 0000000020000140 RSI: 0000000000000002 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 1000000000000162 R11: 0000000000000246 R12: 00007fe7dc8bc6d4
R13: 00000000004cb820 R14: 00000000004d22b8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..