IPVS: set_ctl: invalid protocol: 54 255.255.255.255:20002
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
IP: [<ffffffff835a2f18>] sock_hold include/net/sock.h:589 [inline]
IP: [<ffffffff835a2f18>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
PGD a2adc067 PUD a2add067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 7108 Comm: syz-executor1 Not tainted 4.4.141-g8ddb600 #76
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b9963000 task.stack: ffff8800a0918000
RIP: 0010:[<ffffffff835a2f18>]  [<ffffffff835a2f18>] sock_hold include/net/sock.h:589 [inline]
RIP: 0010:[<ffffffff835a2f18>]  [<ffffffff835a2f18>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
RSP: 0018:ffff8800a091fb48  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8800b6f2b180 RCX: ffffc90001c38000
RDX: 1ffff10016de5660 RSI: ffffffff8359cff3 RDI: ffff8800b6f2b300
RBP: ffff8800a091fbb8 R08: ffff8800b9963900 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff84638f60 R12: ffff8801d6ec20a8
R13: ffff8800a091fcd0 R14: ffff8801d6ec2000 R15: ffffffff8359bc20
FS:  00007f734539d700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000000a2adb000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8113da8a ffff8800b6f2b1a0 ffff8801d6ec2158 ffff8801d6ec2010
 ffffffff838c4510 ffff8801d6ec20b0 ffff8801d6ec2150 ffff8800b6f2b260
 ffffffff00000000 ffff8801bde28000 0000000000000000 ffff8801bde28030
Call Trace:
 [<ffffffff835a7310>] pppol2tp_connect+0x10f0/0x1910 net/l2tp/l2tp_ppp.c:725
 [<ffffffff82f20b18>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
 [<ffffffff82f23454>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff838c4ba5>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 00 00 48 8d bb 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 36 06 00 00 48 8b 83 80 01 00 00 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 91 13 
RIP  [<ffffffff835a2f18>] sock_hold include/net/sock.h:589 [inline]
RIP  [<ffffffff835a2f18>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
 RSP <ffff8800a091fb48>
CR2: 0000000000000080
---[ end trace d4f595fa5f0833dd ]---