------------[ cut here ]------------
ip6tnl0: caps=(0x00000000401d7869, 0x00000000401d7869) len=353 data_len=209 gso_size=6 gso_type=131072 ip_summed=0
WARNING: CPU: 0 PID: 9615 at net/core/dev.c:2663 skb_warn_bad_offload+0x2bc/0x600 net/core/dev.c:2658
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 9615 Comm: syz-executor5 Not tainted 4.17.0-rc2+ #23
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+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:skb_warn_bad_offload+0x2bc/0x600 net/core/dev.c:2658
RSP: 0018:ffff880196e3e868 EFLAGS: 00010286
RAX: 0000000000000072 RBX: ffff8801b8876c50 RCX: ffffc900052c2000
RDX: 0000000000007fe6 RSI: ffffffff8160f561 RDI: ffff880196e3e3c8
RBP: ffff880196e3e8c0 R08: ffff8801bd9fc000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801d07a5b20 R14: 0000000000020000 R15: 0000000000000006
 __skb_gso_segment+0x6ab/0x870 net/core/dev.c:2870
 skb_gso_segment include/linux/netdevice.h:4038 [inline]
 validate_xmit_skb+0x54d/0xd90 net/core/dev.c:3120
 __dev_queue_xmit+0xbf8/0x34c0 net/core/dev.c:3577
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3618
 neigh_direct_output+0x15/0x20 net/core/neighbour.c:1401
 neigh_output include/net/neighbour.h:483 [inline]
 ip6_finish_output2+0xc93/0x2800 net/ipv6/ip6_output.c:120
sctp: [Deprecated]: syz-executor6 (pid 9646) Use of int in max_burst socket option.
Use struct sctp_assoc_value instead
 ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip6_output+0x227/0x9b0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:444 [inline]
 ip6_local_out+0xc5/0x1b0 net/ipv6/output_core.c:176
 ip6_send_skb+0xba/0x340 net/ipv6/ip6_output.c:1715
 udp_v6_send_skb.isra.24+0xa42/0x1250 net/ipv6/udp.c:1079
 udpv6_sendmsg+0x2a7c/0x32a0 net/ipv6/udp.c:1356
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
sctp: [Deprecated]: syz-executor6 (pid 9646) Use of int in max_burst socket option.
Use struct sctp_assoc_value instead
 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455979
RSP: 002b:00007fc041bccc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fc041bcd6d4 RCX: 0000000000455979
RDX: 040000000000011d RSI: 0000000020001c40 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004d4 R14: 00000000006fa480 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..