SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12336 sclass=netlink_route_socket
BUG: unable to handle kernel NULL pointer dereference[  233.617695] SELinux: unrecognized netlink message: protocol=0 nlmsg_type=12336 sclass=netlink_route_socket
 at 0000000000000080
IP: [<ffffffff835a334c>] l2tp_session_free+0x11c/0x200 net/l2tp/l2tp_core.c:1671
PGD 1d2e87067 PUD 1d2ff0067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 2028 Comm: udevd Not tainted 4.4.146-g1396226 #79
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d2d5b000 task.stack: ffff8801d2fe8000
RIP: 0010:[<ffffffff835a334c>]  [<ffffffff835a334c>] l2tp_session_free+0x11c/0x200 net/l2tp/l2tp_core.c:1671
RSP: 0018:ffff8801db207af0  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801d945e280 RCX: 0000000000000000
RDX: 1ffff1003a829570 RSI: ffffffff835a3321 RDI: ffff8801d414ab80
RBP: ffff8801db207b10 R08: ffff8801d2d5b950 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d414aa00
R13: ffff8801d945e288 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f6703e077a0(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000001d2cca000 CR4: 00000000001606f0
Stack:
 ffff8800b2eb9100 ffff8801d945e280 ffff8800b2eb94d0 ffffffff8348b50e
 ffff8801db207b38 ffffffff835acdc7 ffff8800b2eb9100 ffffffff835accf0
 ffff8800b6fb2420 ffff8801db207b60 ffffffff82f3484c ffff8800b2eb9100
Call Trace:
 <IRQ> 
 [<ffffffff835acdc7>] l2tp_session_dec_refcount_1 net/l2tp/l2tp_core.h:293 [inline]
 [<ffffffff835acdc7>] pppol2tp_session_destruct+0xd7/0x110 net/l2tp/l2tp_ppp.c:477
 [<ffffffff82f3484c>] sk_destruct+0x4c/0x4c0 net/core/sock.c:1447
 [<ffffffff82f34d0f>] __sk_free+0x4f/0x220 net/core/sock.c:1480
 [<ffffffff82f36ca3>] sock_wfree+0x103/0x140 net/core/sock.c:1667
 [<ffffffff82f3a923>] skb_release_head_state+0x103/0x210 net/core/skbuff.c:646
 [<ffffffff82f3c805>] skb_release_all+0x15/0x60 net/core/skbuff.c:659
 [<ffffffff82f3c865>] __kfree_skb+0x15/0x20 net/core/skbuff.c:675
 [<ffffffff82f3c967>] kfree_skb+0xf7/0x3e0 net/core/skbuff.c:696
 [<ffffffff8348b50e>] ndisc_error_report+0xbe/0x1a0 net/ipv6/ndisc.c:657
 [<ffffffff82fa6754>] neigh_invalidate+0x234/0x530 net/core/neighbour.c:855
 [<ffffffff82fabb78>] neigh_timer_handler+0x838/0xa50 net/core/neighbour.c:941
 [<ffffffff81292d4c>] call_timer_fn+0x18c/0x870 kernel/time/timer.c:1185
 [<ffffffff81293a72>] __run_timers kernel/time/timer.c:1261 [inline]
 [<ffffffff81293a72>] run_timer_softirq+0x642/0xb90 kernel/time/timer.c:1444
 [<ffffffff838cbf3c>] __do_softirq+0x22c/0xa1a kernel/softirq.c:273
 [<ffffffff81141a8d>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff81141a8d>] irq_exit+0x10d/0x140 kernel/softirq.c:391
 [<ffffffff838cb6a1>] exiting_irq arch/x86/include/asm/apic.h:652 [inline]
 [<ffffffff838cb6a1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff838ca5e0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741
 <EOI> 
 [<ffffffff81c5670d>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<ffffffff81c5670d>] avc_reclaim_node security/selinux/avc.c:543 [inline]
 [<ffffffff81c5670d>] avc_alloc_node+0x28d/0x3d0 security/selinux/avc.c:561
 [<ffffffff81c57358>] avc_insert security/selinux/avc.c:672 [inline]
 [<ffffffff81c57358>] avc_compute_av+0x178/0x610 security/selinux/avc.c:978
 [<ffffffff81c58f63>] avc_has_perm_noaudit+0x323/0x450 security/selinux/avc.c:1114
 [<ffffffff81c62749>] selinux_inode_permission+0x269/0x480 security/selinux/hooks.c:2902
 [<ffffffff81c4fc89>] security_inode_permission+0xb9/0x100 security/security.c:600
 [<ffffffff8153e6d3>] __inode_permission2+0x93/0x240 fs/namei.c:425
 [<ffffffff8153e8df>] inode_permission2+0x2f/0x110 fs/namei.c:475
 [<ffffffff8154bf5c>] may_lookup fs/namei.c:1665 [inline]
 [<ffffffff8154bf5c>] link_path_walk+0x18c/0x1710 fs/namei.c:1929
 [<ffffffff8154e014>] path_lookupat.isra.36+0x1b4/0x410 fs/namei.c:2153
 [<ffffffff81552bb7>] filename_lookup.part.53+0x177/0x370 fs/namei.c:2188
 [<ffffffff81552f73>] filename_lookup fs/namei.c:2181 [inline]
 [<ffffffff81552f73>] user_path_at_empty+0x53/0x70 fs/namei.c:2362
 [<ffffffff8152f286>] SYSC_readlinkat fs/stat.c:327 [inline]
 [<ffffffff8152f286>] SyS_readlinkat fs/stat.c:315 [inline]
 [<ffffffff8152f286>] SYSC_readlink fs/stat.c:352 [inline]
 [<ffffffff8152f286>] SyS_readlink+0xe6/0x320 fs/stat.c:349
 [<ffffffff838c8a25>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 49 8d bc 24 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 d0 00 00 00 4d 8b b4 24 80 01 00 00 <f0> 41 ff 8e 80 00 00 00 74 64 e8 55 04 db fd e8 50 04 db fd 4c 
RIP  [<ffffffff835a334c>] l2tp_session_free+0x11c/0x200 net/l2tp/l2tp_core.c:1671
 RSP <ffff8801db207af0>
CR2: 0000000000000080
---[ end trace c5149f552ca64565 ]---