------------[ cut here ]------------
proc_dir_entry 'ip6t_hashlimit/syzkaller1' already registered
WARNING: CPU: 1 PID: 8319 at fs/proc/generic.c:363 proc_register+0x2f1/0x4c0 fs/proc/generic.c:362
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8319 Comm: syz-executor.3 Not tainted 5.5.0-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+0x12d/0x187 lib/dump_stack.c:118
 panic+0x22a/0x4e3 kernel/panic.c:221
 __warn.cold.10+0x25/0x2a kernel/panic.c:582
 report_bug+0x1b0/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 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:proc_register+0x2f1/0x4c0 fs/proc/generic.c:362
Code: 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 bd 01 00 00 48 8b b3 d0 00 00 00 48 c7 c7 a0 9e b7 87 e8 47 96 73 ff <0f> 0b 48 c7 c7 c0 2c 0a 89 e8 c1 a5 85 05 4c 89 ea 48 b8 00 00 00
RSP: 0018:ffffc90007837500 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88809b3f6280 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 0000000000000008 RDI: ffffffff8ab81360
RBP: ffffc90007837550 R08: ffffed1015d66659 R09: ffffed1015d66659
R10: ffffed1015d66658 R11: ffff8880aeb332c7 R12: ffffed1012a494d3
R13: ffff88809524a64c R14: ffff88809524a690 R15: ffff88809524a5c0
 proc_create_seq_private+0xec/0x170 fs/proc/generic.c:593
 htable_create net/netfilter/xt_hashlimit.c:341 [inline]
 hashlimit_mt_check_common.isra.9+0x899/0x11b0 net/netfilter/xt_hashlimit.c:902
 hashlimit_mt_check_v1+0x2f7/0x37a net/netfilter/xt_hashlimit.c:928
 xt_check_match+0x200/0x5f0 net/netfilter/x_tables.c:501
 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline]
 find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline]
 find_check_entry.isra.8+0x310/0x910 net/ipv6/netfilter/ip6_tables.c:557
 translate_table+0xd15/0x1ab0 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline]
 do_ip6t_set_ctl+0x251/0x40b net/ipv6/netfilter/ip6_tables.c:1681
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x5c/0xb0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x9e/0x100 net/ipv6/ipv6_sockglue.c:949
 rawv6_setsockopt+0x34/0xd0 net/ipv6/raw.c:1081
 sock_common_setsockopt+0x73/0xf0 net/core/sock.c:3149
 __sys_setsockopt+0x213/0x440 net/socket.c:2130
 __do_sys_setsockopt net/socket.c:2146 [inline]
 __se_sys_setsockopt net/socket.c:2143 [inline]
 __x64_sys_setsockopt+0xb9/0x150 net/socket.c:2143
 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7703afcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f7703afd6d4 RCX: 000000000045b399
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a04 R14: 00000000004d4558 R15: 000000000075bfd4
Kernel Offset: disabled
Rebooting in 86400 seconds..