------------[ cut here ]------------
WARNING: CPU: 0 PID: 20792 at net/core/dev.c:2490 skb_warn_bad_offload+0x2b0/0x390 net/core/dev.c:2490
sit0: caps=(0x00000000803b7869, 0x0000000000000000) len=2056 data_len=2008 gso_size=1992 gso_type=2 ip_summed=0
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 20792 Comm: syz-executor.1 Not tainted 4.9.194+ #0
 ffff88019f62ef50 ffffffff81b67001 ffff88019f62f000 ffffffff82a3b3c0
 00000000ffffffff 0000000000000000 0000000000000009 ffff88019f62f030
 ffffffff813fef3a 0000000041b58ab3 ffffffff82e32f55 ffffffff813fed61
Call Trace:
 [<00000000aec3c94a>] __dump_stack lib/dump_stack.c:15 [inline]
 [<00000000aec3c94a>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<0000000014cbffdd>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<00000000b08d007b>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<0000000018e74ee2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:569
 [<00000000e6a59428>] skb_warn_bad_offload+0x2b0/0x390 net/core/dev.c:2490
 [<00000000df962de2>] __skb_gso_segment+0x597/0x6c0 net/core/dev.c:2796
 [<000000001acb91f2>] skb_gso_segment include/linux/netdevice.h:4010 [inline]
 [<000000001acb91f2>] validate_xmit_skb+0x4a1/0xaa0 net/core/dev.c:3032
 [<00000000cefa5b32>] __dev_queue_xmit+0x83e/0x1bd0 net/core/dev.c:3465
 [<000000000747ab0e>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3506
 [<00000000e8e90231>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1368
 [<000000005af71676>] dst_neigh_output include/net/dst.h:470 [inline]
 [<000000005af71676>] ip6_finish_output2+0x94f/0x1e50 net/ipv6/ip6_output.c:119
 [<0000000088c946fd>] ip6_finish_output+0x336/0x970 net/ipv6/ip6_output.c:145
 [<000000004990c9ab>] NF_HOOK_COND include/linux/netfilter.h:246 [inline]
 [<000000004990c9ab>] ip6_output+0x21b/0x730 net/ipv6/ip6_output.c:162
 [<00000000d72d5923>] dst_output include/net/dst.h:507 [inline]
 [<00000000d72d5923>] ip6_local_out+0x9c/0x180 net/ipv6/output_core.c:178
 [<00000000b1500a66>] ip6_send_skb+0xa2/0x340 net/ipv6/ip6_output.c:1753
 [<00000000c006d851>] udp_v6_send_skb+0x85c/0xe90 net/ipv6/udp.c:974
 [<00000000e33157d4>] udp_v6_push_pending_frames+0x245/0x360 net/ipv6/udp.c:1007
 [<000000004a0cac5c>] udpv6_sendmsg+0x19b0/0x2430 net/ipv6/udp.c:1273
 [<00000000f6ba4d51>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:766
 [<00000000632950a7>] sock_sendmsg_nosec net/socket.c:649 [inline]
 [<00000000632950a7>] sock_sendmsg+0xbe/0x110 net/socket.c:659
 [<00000000ca2e596d>] ___sys_sendmsg+0x78b/0x8b0 net/socket.c:1983
 [<00000000c732db47>] __sys_sendmsg+0xc8/0x170 net/socket.c:2017
 [<0000000019e623c6>] SYSC_sendmsg net/socket.c:2028 [inline]
 [<0000000019e623c6>] SyS_sendmsg+0x2d/0x50 net/socket.c:2024
 [<000000003363a639>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000022d6e4ef>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..