xt_SECMARK: mode already set to 1 cannot mix with rules for mode 0
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
------------[ cut here ]------------
name 'gre/à'
WARNING: CPU: 0 PID: 18342 at fs/proc/generic.c:163 __xlate_proc_name+0xe6/0x110 fs/proc/generic.c:163
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 18342 Comm: syz-executor5 Not tainted 4.16.0-rc2+ #249
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
cannot load conntrack support for proto=7
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
cannot load conntrack support for proto=7
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
RIP: 0010:__xlate_proc_name+0xe6/0x110 fs/proc/generic.c:163
RSP: 0018:ffff8801ad83f288 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: 0000000000000003 RCX: ffffffff815ac30e
RDX: 0000000000004f39 RSI: ffffc90003fd6000 RDI: 1ffff10035b07dd6
RBP: ffff8801ad83f2b8 R08: 1ffff10035b07d98 R09: 0000000000000000
R10: ffff8801ad83f180 R11: 0000000000000000 R12: ffff8801c7cb0e48
R13: 0000000000000000 R14: ffff8801ad83f450 R15: ffff8801c7cb0e48
 xlate_proc_name fs/proc/generic.c:179 [inline]
 __proc_create+0xcc/0x890 fs/proc/generic.c:349
 proc_create_data+0x76/0x180 fs/proc/generic.c:488
 htable_create net/netfilter/xt_hashlimit.c:333 [inline]
 hashlimit_mt_check_common.isra.9+0xaab/0x1550 net/netfilter/xt_hashlimit.c:902
 hashlimit_mt_check_v2+0x495/0x640 net/netfilter/xt_hashlimit.c:946
 xt_check_match+0x235/0x9c0 net/netfilter/x_tables.c:469
 check_match net/ipv6/netfilter/ip6_tables.c:496 [inline]
 find_check_match net/ipv6/netfilter/ip6_tables.c:513 [inline]
 find_check_entry.isra.7+0x42d/0xcf0 net/ipv6/netfilter/ip6_tables.c:564
 translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:748
 do_replace net/ipv6/netfilter/ip6_tables.c:1164 [inline]
 do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1690
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x10b/0x130 net/ipv6/ipv6_sockglue.c:927
 udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1422
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2979
 SYSC_setsockopt net/socket.c:1850 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1829
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453d69
RSP: 002b:00007f7c0a81dc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f7c0a81e6d4 RCX: 0000000000453d69
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000538 R09: 0000000000000000
R10: 00000000200015c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004e9 R14: 00000000006f7678 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..