audit: type=1400 audit(1519354903.028:6): avc:  denied  { write } for  pid=3750 comm="syzkaller410724" 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: 1 PID: 3750 Comm: syzkaller410724 Not tainted 4.4.116-g17c7c49 #17
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800ad571800 task.stack: ffff8800bb2c0000
RIP: 0010:[<ffffffff82f88f30>]  [<ffffffff82f88f30>] netlink_getsockbyportid net/netlink/af_netlink.c:1102 [inline]
RIP: 0010:[<ffffffff82f88f30>]  [<ffffffff82f88f30>] netlink_unicast+0x1c0/0x760 net/netlink/af_netlink.c:1287
RSP: 0018:ffff8800bb2c7778  EFLAGS: 00010293
RAX: dffffc0000000048 RBX: dffffc0000000000 RCX: ffffffff82f88f29
RDX: 0000000000000000 RSI: 00000000024000c0 RDI: ffff8801d1c68358
RBP: ffff8800bb2c7838 R08: ffffed00399575ca R09: ffffed00399575ca
R10: 0000000000000000 R11: ffffed00399575c9 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8801d1c68280 R15: dffffc0000000006
FS:  0000000000aee880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000203e7ec4 CR3: 00000000ad5c4000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 1ffff10017658ef6 ffff8801ccabad00 0000000000000240 0000000000000030
 1ffff10017658ef6 dffffc0000000048 0000000000000ea6 0000000041b58ab3
 ffffffff84001281 ffffffff82f88d70 ffff8801d1c68280 0000000000000000
Call Trace:
 [<ffffffff82f8a351>] netlink_ack+0x231/0x4b0 net/netlink/af_netlink.c:2322
 [<ffffffff82f981d2>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline]
 [<ffffffff82f981d2>] nfnetlink_rcv+0xaa2/0x1070 net/netfilter/nfnetlink.c:477
 [<ffffffff82f89292>] netlink_unicast_kernel net/netlink/af_netlink.c:1267 [inline]
 [<ffffffff82f89292>] netlink_unicast+0x522/0x760 net/netlink/af_netlink.c:1293
 [<ffffffff82f89db8>] netlink_sendmsg+0x8e8/0xc50 net/netlink/af_netlink.c:1847
 [<ffffffff82debb4a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82debb4a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82ded721>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82def773>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82def85d>] SYSC_sendmsg net/socket.c:2007 [inline]
 [<ffffffff82def85d>] SyS_sendmsg+0x2d/0x50 net/socket.c:2003
 [<ffffffff83774a1f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Code: 57 7e 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 37 7e 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  [<ffffffff82f88f30>] netlink_getsockbyportid net/netlink/af_netlink.c:1102 [inline]
RIP  [<ffffffff82f88f30>] netlink_unicast+0x1c0/0x760 net/netlink/af_netlink.c:1287
 RSP <ffff8800bb2c7778>
---[ end trace 7978d7685980143d ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..