audit: type=1400 audit(1521749155.014:6): avc:  denied  { write } for  pid=3809 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3809 Comm: syz-executor0 Not tainted 4.4.120-gd63fdf6 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800a9f8c800 task.stack: ffff8800a9e68000
RIP: 0010:[<ffffffff82f89d90>]  [<ffffffff82f89d90>] netlink_getsockbyportid net/netlink/af_netlink.c:1102 [inline]
RIP: 0010:[<ffffffff82f89d90>]  [<ffffffff82f89d90>] netlink_unicast+0x1c0/0x760 net/netlink/af_netlink.c:1287
RSP: 0018:ffff8800a9e6f6f8  EFLAGS: 00010293
RAX: dffffc0000000048 RBX: dffffc0000000000 RCX: ffffffff82f89d89
RDX: 0000000000000000 RSI: 00000000024000c0 RDI: ffff8801cb4ae218
RBP: ffff8800a9e6f7b8 R08: ffffed0038a4e5d4 R09: ffffed0038a4e5d4
R10: 0000000000000000 R11: ffffed0038a4e5d3 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8801cb4ae140 R15: dffffc0000000006
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008ab0900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000008068550 CR3: 00000000aa3cc000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 1ffff100153cdee6 ffff8801c5272200 0000000000000240 0000000000000030
 1ffff100153cdee6 dffffc0000000048 0000000000000002 0000000041b58ab3
 ffffffff84001503 ffffffff82f89bd0 ffff8801cb4ae140 0000000000000000
Call Trace:
 [<ffffffff82f8b1b1>] netlink_ack+0x231/0x4b0 net/netlink/af_netlink.c:2322
 [<ffffffff82f98fd2>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline]
 [<ffffffff82f98fd2>] nfnetlink_rcv+0xaa2/0x1070 net/netfilter/nfnetlink.c:477
 [<ffffffff82f8a0f2>] netlink_unicast_kernel net/netlink/af_netlink.c:1267 [inline]
 [<ffffffff82f8a0f2>] netlink_unicast+0x522/0x760 net/netlink/af_netlink.c:1293
 [<ffffffff82f8ac18>] netlink_sendmsg+0x8e8/0xc50 net/netlink/af_netlink.c:1847
 [<ffffffff82deba6a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82deba6a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82ded641>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82def693>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82eda56a>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff82eda56a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<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: e7 6f 3d fe 48 8d 55 98 4c 89 e1 4c 89 f6 48 89 df e8 95 f7 ff ff 83 f8 01 0f 85 e1 03 00 00 e8 c7 6f 3d fe 48 8b 85 68 ff ff ff <0f> b6 00 84 c0 74 08 3c 03 0f 8e 63 05 00 00 41 80 3f 00 41 0f 
RIP  [<ffffffff82f89d90>] netlink_getsockbyportid net/netlink/af_netlink.c:1102 [inline]
RIP  [<ffffffff82f89d90>] netlink_unicast+0x1c0/0x760 net/netlink/af_netlink.c:1287
 RSP <ffff8800a9e6f6f8>
---[ end trace a347f91764028aba ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..