syzbot

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WARNING: CPU: 1 PID: 6595 at net/core/dev.c:2473 skb_warn_bad_offload+0x2af/0x380 net/core/dev.c:2468
sit0: caps=(0x00000000803b7869, 0x0000000000000000) len=65081 data_len=65033 gso_size=1432 gso_type=2 ip_summed=0
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6595 Comm: syz-executor686 Not tainted 4.9.107-gdb2c520 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c26d70d8 ffffffff81eb3da9 ffffffff83c48b40 00000000ffffffff
 0000000000000000 0000000000000001 00000000000009a9 ffff8801c26d7198
 ffffffff81421925 0000000041b58ab3 ffffffff843b9b48 ffffffff81421766
Call Trace:
 [<ffffffff81eb3da9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3da9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81421925>] panic+0x1bf/0x3bc kernel/panic.c:179
 [<ffffffff81421c11>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542
 [<ffffffff81136662>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff8306cd6f>] skb_warn_bad_offload+0x2af/0x380 net/core/dev.c:2468
 [<ffffffff830880f6>] __skb_gso_segment+0x546/0x680 net/core/dev.c:2774
 [<ffffffff830890ae>] skb_gso_segment include/linux/netdevice.h:4000 [inline]
 [<ffffffff830890ae>] validate_xmit_skb+0x48e/0xab0 net/core/dev.c:3010
 [<ffffffff8308abe8>] __dev_queue_xmit+0x888/0x2080 net/core/dev.c:3443
 [<ffffffff8308c3f7>] dev_queue_xmit+0x17/0x20 net/core/dev.c:3484
 [<ffffffff830a0b55>] neigh_direct_output+0x15/0x20 net/core/neighbour.c:1362
 [<ffffffff83557bf8>] dst_neigh_output include/net/dst.h:470 [inline]
 [<ffffffff83557bf8>] ip6_finish_output2+0x8a8/0x1d00 net/ipv6/ip6_output.c:119
 [<ffffffff835613d8>] ip6_finish_output+0x3b8/0x760 net/ipv6/ip6_output.c:145
 [<ffffffff83561973>] NF_HOOK_COND include/linux/netfilter.h:246 [inline]
 [<ffffffff83561973>] ip6_output+0x1f3/0x6e0 net/ipv6/ip6_output.c:162
 [<ffffffff8367b5bb>] dst_output include/net/dst.h:507 [inline]
 [<ffffffff8367b5bb>] ip6_local_out+0x9b/0x180 net/ipv6/output_core.c:176
 [<ffffffff83563b31>] ip6_send_skb+0xa1/0x340 net/ipv6/ip6_output.c:1750
 [<ffffffff835c380a>] udp_v6_send_skb+0x5ba/0xe70 net/ipv6/udp.c:974
 [<ffffffff835c923b>] udpv6_sendmsg+0x1ebb/0x2430 net/ipv6/udp.c:1246
 [<ffffffff83429ec3>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:770
 [<ffffffff83016fcc>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff83016fcc>] sock_sendmsg+0xcc/0x110 net/socket.c:645
 [<ffffffff83017cbc>] SYSC_sendto+0x21c/0x370 net/socket.c:1670
 [<ffffffff8301a2d0>] SyS_sendto+0x40/0x50 net/socket.c:1638
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..