BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
IP: [<ffffffff836c3d90>] sock_hold include/net/sock.h:584 [inline]
IP: [<ffffffff836c3d90>] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911
PGD 1a619a067 [  252.538740] PUD 1c2cbd067 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 22057 Comm: syz-executor6 Not tainted 4.9.117-g8b21e85 #71
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019299b000 task.stack: ffff8801b04b0000
RIP: 0010:[<ffffffff836c3d90>]  [<ffffffff836c3d90>] sock_hold include/net/sock.h:584 [inline]
RIP: 0010:[<ffffffff836c3d90>]  [<ffffffff836c3d90>] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=22088 comm=syz-executor0
RSP: 0018:ffff8801b04b7ac0  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801b58c2c80 RCX: 1ffff1003253371d
RDX: 1ffff1003b338f00 RSI: ffff88019299b8c8 RDI: ffff8801d99c7800
RBP: ffff8801b04b7b60 R08: ffff88019299b8e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d99c76d8
R13: 0000000000000000 R14: ffff8801d99c7680 R15: 0000000000000000
FS:  00007fac01531700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000001cb903000 CR4: 00000000001606f0
Stack:
 ffffffff836c4007 ffffffff836c50a1 ffff8801a54abb48 0000000000000000
 ffff8801d99c7680 ffff8801b58c2dd8 ffff8801d99c76d8 ffff8801b58c2dd0
 ffff8801b58c2d30 ffff8801d99c76a0 ffff8801a54ab300 0000000000000000
Call Trace:
 [<ffffffff836c8f47>] pppol2tp_connect+0x10d7/0x18f0 net/l2tp/l2tp_ppp.c:718
 [<ffffffff83019958>] SYSC_connect+0x1b8/0x300 net/socket.c:1562
 [<ffffffff8301c224>] SyS_connect+0x24/0x30 net/socket.c:1543
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 
RIP [  252.819246] SELinux:  policydb magic number 0x2e202123 does not match expected magic number 0xf97cff8c
 [<ffffffff836c3d90>] sock_hold include/net/sock.h:584 [inline]
 [<ffffffff836c3d90>] l2tp_session_create+0xc60/0x16f0 net/l2tp/l2tp_core.c:1911
CR2: 0000000000000080
---[ end trace d7225c86ed2d116f ]---