l2tp_ppp: sess 4/0: set debug=cf
skbuff: skb_over_panic: text:ffffffff83214360 len:64980 put:64980 head:ffff8800b6109b80 data:ffff8800b6109c10 tail:0xfe64 end:0xc0 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:104!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3883 Comm: syz-executor3 Not tainted 4.4.141-g1b37d68 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800ba411800 task.stack: ffff8800b7548000
RIP: 0010:[<ffffffff8389645c>]  [<ffffffff8389645c>] skb_panic+0x166/0x168 net/core/skbuff.c:100
RSP: 0018:ffff8800b754f398  EFLAGS: 00010286
RAX: 000000000000008d RBX: ffff8801d4bbb3c0 RCX: ffffc90002a7b000
RDX: 0000000000000000 RSI: ffffffff8125d2b9 RDI: ffff8800ba4120dc
RBP: ffff8800b754f400 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff83ec5560
R13: ffff8800b6109c10 R14: 000000000000fe64 R15: 00000000000000c0
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f57e9b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007ffe99df5dcc CR3: 00000001d78a2000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800b6109c10 000000000000fe64 00000000000000c0 ffffffff83ec5560
 0000000000000000 ffffffff83ec5a60 ffffffff83214360 0000fdd400000001
 ffff8801d4bbb3c0 ffffffff83214360 ffff8800b6109c10 000000000000fdd4
Call Trace:
 [<ffffffff838964a4>] skb_over_panic net/core/skbuff.c:109 [inline]
 [<ffffffff838964a4>] skb_put.cold.72+0x23/0x23 net/core/skbuff.c:1362
 [<ffffffff83214360>] __ip_append_data.isra.45+0x1d40/0x2a70 net/ipv4/ip_output.c:1026
 [<ffffffff83215174>] ip_append_data.part.47+0xe4/0x150 net/ipv4/ip_output.c:1193
l2tp_ppp: sess 4/0: set debug=cf
00000000: 00 03 00 00 00 00 00 02 ff 03 10 00 00 00 00 00  ................
00000010: 00 00 00 00 00 00 00 00 00 00                    ..........
IPVS: sh: UDP 127.0.0.1:0 - no destination available
 [<ffffffff8321d6c8>] ip_append_data+0x68/0x80 net/ipv4/ip_output.c:1182
 [<ffffffff832d0a8a>] udp_sendmsg+0xc5a/0x1c70 net/ipv4/udp.c:1098
 [<ffffffff8349677d>] udpv6_sendmsg+0x12cd/0x24c0 net/ipv6/udp.c:1173
 [<ffffffff83301113>] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:755
 [<ffffffff82f1e2fc>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82f1e2fc>] sock_sendmsg+0xcc/0x110 net/socket.c:635
 [<ffffffff82f1efdc>] SYSC_sendto+0x21c/0x370 net/socket.c:1665
 [<ffffffff82f21660>] SyS_sendto+0x40/0x50 net/socket.c:1633
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c456a>] sysenter_flags_fixed+0xd/0x17
Code: 2b 34 c6 fd 4c 8b 4d b8 8b 4b 78 41 54 48 c7 c7 a0 55 ec 83 44 8b 45 d4 41 57 48 8b 55 c8 41 56 48 8b 75 c0 41 55 e8 8d ee b7 fd <0f> 0b e8 bd b0 ab fd 4c 8b 65 08 e8 d4 1d c6 fd 48 c7 c1 20 5a 
RIP  [<ffffffff8389645c>] skb_panic+0x166/0x168 net/core/skbuff.c:100
 RSP <ffff8800b754f398>
---[ end trace bdfe96871a7c8a8b ]---