------------[ cut here ]------------
WARNING: CPU: 0 PID: 3287 at net/core/dev.c:2465 skb_warn_bad_offload+0x2af/0x390 net/core/dev.c:2460
lo: caps=(0x000000a2803b7c69, 0x0000000000000000) len=2105 data_len=2043 gso_size=1992 gso_type=2 ip_summed=0
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3287 Comm: syzkaller501540 Not tainted 4.9.67-gf26d3c7 #106
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cbf96ed8 ffffffff81d906e9 ffffffff83a46d00 ffff8801cbf96fb0
 ffffffff83ee0b00 ffffffff82f2c24f 0000000000000009 ffff8801cbf96fa0
 ffffffff8142c411 0000000041b58ab3 ffffffff84186cc0 ffffffff8142c255
Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142c411>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff8112f3d4>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff8112f4b4>] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565
 [<ffffffff82f2c24f>] skb_warn_bad_offload+0x2af/0x390 net/core/dev.c:2460
 [<ffffffff82f3fdeb>] __skb_gso_segment+0x52b/0x670 net/core/dev.c:2766
 [<ffffffff82f40c8e>] skb_gso_segment include/linux/netdevice.h:4000 [inline]
 [<ffffffff82f40c8e>] validate_xmit_skb+0x44e/0x980 net/core/dev.c:3002
 [<ffffffff82f42897>] __dev_queue_xmit+0xa17/0x1e60 net/core/dev.c:3416
 [<ffffffff82f43cf7>] dev_queue_xmit+0x17/0x20 net/core/dev.c:3457
 [<ffffffff82f639e9>] neigh_resolve_output+0x469/0x770 net/core/neighbour.c:1308
 [<ffffffff83413c80>] dst_neigh_output include/net/dst.h:470 [inline]
 [<ffffffff83413c80>] ip6_finish_output2+0x930/0x1d20 net/ipv6/ip6_output.c:119
 [<ffffffff8341d146>] ip6_finish_output+0x2e6/0x750 net/ipv6/ip6_output.c:145
 [<ffffffff8341d7a3>] NF_HOOK_COND include/linux/netfilter.h:246 [inline]
 [<ffffffff8341d7a3>] ip6_output+0x1f3/0x6a0 net/ipv6/ip6_output.c:162
 [<ffffffff835375e5>] dst_output include/net/dst.h:507 [inline]
 [<ffffffff835375e5>] ip6_local_out+0x95/0x170 net/ipv6/output_core.c:176
 [<ffffffff8341f881>] ip6_send_skb+0xa1/0x340 net/ipv6/ip6_output.c:1731
 [<ffffffff834804d1>] udp_v6_send_skb+0x301/0xeb0 net/ipv6/udp.c:974
 [<ffffffff8348145f>] udp_v6_push_pending_frames+0x22f/0x340 net/ipv6/udp.c:1007
 [<ffffffff83486288>] udpv6_sendmsg+0x1f38/0x2540 net/ipv6/udp.c:1273
 [<ffffffff832e771c>] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:770
 [<ffffffff82eceb9a>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82eceb9a>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82ed0791>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1968
 [<ffffffff82ed27c6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2002
 [<ffffffff82ed28ad>] SYSC_sendmsg net/socket.c:2013 [inline]
 [<ffffffff82ed28ad>] SyS_sendmsg+0x2d/0x50 net/socket.c:2009
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..