IPVS: Creating netns size=2552 id=6
IPVS: Creating netns size=2552 id=7
IPVS: Creating netns size=2552 id=8
l2tp_core: tunl 3: fd 3 wrong protocol, got 1, expected 17
l2tp_core: tunl 3: fd 4 wrong protocol, got 1, expected 17
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 80000000b6335067 PUD b6336067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 7384 Comm: syz-executor3 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b9806000 task.stack: ffff8801c78d8000
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:ffff8801c78dfad0  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801cef3f400 RCX: ffffffff83458dd6
RDX: 1ffff10039de7eb0 RSI: 0000000000000002 RDI: ffff8801cef3f580
RBP: ffff8801c78dfb40 R08: ffff8800addbb990 R09: 0000000000000000
R10: ffffffff85700600 R11: ffffffff84418340 R12: ffff8800addbb9a8
R13: ffff8801c78dfc58 R14: ffff8801cef3f4e0 R15: ffff8800addbb900
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77e2b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000000b1570000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8113bd95 ffff8801cef3f420 ffff8800addbba58 ffff8801c78dfb00
 ffff8800addbb910 0000000000000000 ffff8800addbb9b0 ffff8800addbba50
 e5d79e3300000000 0000000000000000 ffff8801d416e600 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
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837752ea>] sysenter_flags_fixed+0xd/0x17
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 <ffff8801c78dfad0>
CR2: 0000000000000080
---[ end trace d96571ac92ac5c91 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..