------------[ cut here ]------------
WARNING: CPU: 1 PID: 3226 at net/core/dev.c:2465 skb_warn_bad_offload+0x2af/0x390 net/core/dev.c:2460
sit1: caps=(0x00000000803b5869, 0x0000000000000000) len=205 data_len=0 gso_size=55468 gso_type=4 ip_summed=0
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3226 Comm: syzkaller163532 Not tainted 4.9.61-ga93e312 #85
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d071f308 ffffffff81d91589 ffffffff83a46ba0 ffff8801d071f3e0
 ffffffff83ee0300 ffffffff82f2c1ff 0000000000000009 ffff8801d071f3d0
 ffffffff8142e391 0000000041b58ab3 ffffffff84185db0 ffffffff8142e1d5
Call Trace:
 [<ffffffff81d91589>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d91589>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8142e391>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff811321e4>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff811322c4>] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565
 [<ffffffff82f2c1ff>] skb_warn_bad_offload+0x2af/0x390 net/core/dev.c:2460
 [<ffffffff82f3fd9b>] __skb_gso_segment+0x52b/0x670 net/core/dev.c:2766
 [<ffffffff82f40c3e>] skb_gso_segment include/linux/netdevice.h:3997 [inline]
 [<ffffffff82f40c3e>] validate_xmit_skb+0x44e/0x980 net/core/dev.c:3002
 [<ffffffff82f42847>] __dev_queue_xmit+0xa17/0x1e60 net/core/dev.c:3416
 [<ffffffff810002b8>] ? 0xffffffff810002b8
 [<ffffffff82f43ca7>] dev_queue_xmit+0x17/0x20 net/core/dev.c:3457
 [<ffffffff83550dac>] packet_snd net/packet/af_packet.c:2958 [inline]
 [<ffffffff83550dac>] packet_sendmsg+0x2ccc/0x4760 net/packet/af_packet.c:2983
 [<ffffffff82eceb9a>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82eceb9a>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82ed03a0>] ___sys_sendmsg+0x320/0x7e0 net/socket.c:1968
 [<ffffffff82ed29e9>] __sys_sendmmsg+0x159/0x3a0 net/socket.c:2058
 [<ffffffff82ed2c65>] SYSC_sendmmsg net/socket.c:2089 [inline]
 [<ffffffff82ed2c65>] SyS_sendmmsg+0x35/0x60 net/socket.c:2084
 [<ffffffff838aa305>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..