IPVS: Creating netns size=2552 id=5
IPVS: Creating netns size=2552 id=6
IPVS: Creating netns size=2552 id=7
IPVS: Creating netns size=2552 id=8
random: nonblocking pool is initialized
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
IP: [<ffffffff8345f7be>] sock_hold include/net/sock.h:589 [inline]
IP: [<ffffffff8345f7be>] l2tp_session_create+0x93e/0x10f0 net/l2tp/l2tp_core.c:1805
PGD 80000001cd5d8067 PUD 1cd7b0067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 8866 Comm: syz-executor4 Not tainted 4.4.120-gd63fdf6 #28
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cc6d4800 task.stack: ffff8801ce9c8000
RIP: 0010:[<ffffffff8345f7be>]  [<ffffffff8345f7be>] sock_hold include/net/sock.h:589 [inline]
RIP: 0010:[<ffffffff8345f7be>]  [<ffffffff8345f7be>] l2tp_session_create+0x93e/0x10f0 net/l2tp/l2tp_core.c:1805
RSP: 0018:ffff8801ce9cfb48  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801d143d400 RCX: ffffffff83458dd6
RDX: 1ffff1003a287ab0 RSI: 0000000000000002 RDI: ffff8801d143d580
RBP: ffff8801ce9cfbb8 R08: 000000000000000a R09: 0000000000000000
R10: ffffffff85700600 R11: ffffffff84418340 R12: ffff8801d143d228
R13: ffff8801ce9cfcd0 R14: ffff8801d143d4e0 R15: ffff8801d143d180
FS:  00007f9c090cc700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000001c9a20000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8113bd95 ffff8801d143d420 ffff8801d143d2d8 ffff8801ce9cfb78
 ffff8801d143d190 0000000000000000 ffff8801d143d230 ffff8801d143d2d0
 eebac54300000000 0000000000000000 ffff8800ab815500 0000000000000000
Call Trace:
 [<ffffffff8346354c>] pppol2tp_connect+0x10fc/0x1930 net/l2tp/l2tp_ppp.c:718
 [<ffffffff82dec596>] SYSC_connect+0x1b6/0x310 net/socket.c:1557
 [<ffffffff82deee04>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff8377395f>] entry_SYSCALL_64_fastpath+0x1c/0x98
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 4f 07 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 b8 e8 cb 38 
RIP  [<ffffffff8345f7be>] sock_hold include/net/sock.h:589 [inline]
RIP  [<ffffffff8345f7be>] l2tp_session_create+0x93e/0x10f0 net/l2tp/l2tp_core.c:1805
 RSP <ffff8801ce9cfb48>
CR2: 0000000000000080
---[ end trace 95d08f65baa7fc9f ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..