device eql entered promiscuous mode
device syz0 entered promiscuous mode
------------[ cut here ]------------
kernel BUG at ./include/linux/skbuff.h:2068!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 2344 Comm: syz-executor2 Not tainted 4.15.0-rc7+ #261
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__skb_pull include/linux/skbuff.h:2068 [inline]
RIP: 0010:skb_pull_inline include/linux/skbuff.h:2074 [inline]
RIP: 0010:skb_pull+0xe8/0x110 net/core/skbuff.c:1731
RSP: 0018:ffff8801c07a71f8 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801cdcc3280 RCX: ffffffff84318118
RDX: 00000000000001d4 RSI: ffffc900020af000 RDI: ffff8801cdcc3304
RBP: ffff8801c07a7210 R08: 1ffff100380f4da7 R09: 0000000000000002
R10: ffff8801c07a7200 R11: 0000000000000000 R12: 000000000000002c
R13: 0000000000000030 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f0cfb2bc700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020d50000 CR3: 00000001cf860001 CR4: 00000000001626e0
Call Trace:
 esp6_gro_receive+0xb4/0xbe0 net/ipv6/esp6_offload.c:63
 call_gro_receive include/linux/netdevice.h:2200 [inline]
 ipv6_gro_receive+0x844/0x13e0 net/ipv6/ip6_offload.c:253
 call_gro_receive include/linux/netdevice.h:2200 [inline]
 vlan_gro_receive+0x486/0x770 net/8021q/vlan.c:665
 dev_gro_receive+0xd38/0x2130 net/core/dev.c:4869
 napi_gro_frags+0x386/0xaf0 net/core/dev.c:5125
 tun_get_user+0x262e/0x3710 drivers/net/tun.c:1757
 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1800
 call_write_iter include/linux/fs.h:1772 [inline]
 do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
 do_iter_write+0x154/0x540 fs/read_write.c:932
 vfs_writev+0x18a/0x340 fs/read_write.c:977
 do_writev+0xfc/0x2a0 fs/read_write.c:1012
 SYSC_writev fs/read_write.c:1085 [inline]
 SyS_writev+0x27/0x30 fs/read_write.c:1082
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452bd1
RSP: 002b:00007f0cfb2bbb80 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f0cfb2bc700 RCX: 0000000000452bd1
RDX: 0000000000000002 RSI: 00007f0cfb2bbbd0 RDI: 0000000000000012
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006a R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f0cfb2bc9c0 R15: 0000000000000000
Code: a3 d8 00 00 00 e8 89 96 3e fd 4c 89 e0 5b 41 5c 41 5d 5d c3 45 31 e4 e8 77 96 3e fd 4c 89 e0 5b 41 5c 41 5d 5d c3 e8 68 96 3e fd <0f> 0b e8 11 98 75 fd eb 97 e8 0a 98 75 fd e9 41 ff ff ff e8 20 
RIP: __skb_pull include/linux/skbuff.h:2068 [inline] RSP: ffff8801c07a71f8
RIP: skb_pull_inline include/linux/skbuff.h:2074 [inline] RSP: ffff8801c07a71f8
RIP: skb_pull+0xe8/0x110 net/core/skbuff.c:1731 RSP: ffff8801c07a71f8
---[ end trace 5ae3c62aa49986ce ]---