audit: type=1400 audit(1513696103.032:6): avc:  denied  { write } for  pid=3305 comm="syzkaller184090" path="socket:[7936]" dev="sockfs" ino=7936 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: 3305 Comm: syzkaller184090 Not tainted 4.4.106-g1700518 #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b4ec2f80 task.stack: ffff8800b4130000
RIP: 0010:[<ffffffff82f84110>]  [<ffffffff82f84110>] netlink_getsockbyportid net/netlink/af_netlink.c:1058 [inline]
RIP: 0010:[<ffffffff82f84110>]  [<ffffffff82f84110>] netlink_unicast+0x1c0/0x760 net/netlink/af_netlink.c:1243
RSP: 0018:ffff8800b41377f8  EFLAGS: 00010293
RAX: dffffc0000000048 RBX: dffffc0000000000 RCX: ffffffff82f84109
RDX: 0000000000000000 RSI: 00000000024000c0 RDI: ffff8800b08865d8
RBP: ffff8800b41378b8 R08: ffffed0016b9e197 R09: ffffed0016b9e197
R10: 0000000000000005 R11: ffffed0016b9e196 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8800b0886500 R15: dffffc0000000006
FS:  0000000000da3880(0063) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020f81000 CR3: 00000000b119d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 1ffff10016826f06 ffff8800b5cf0c80 0000000000000240 0000000000000030
 1ffff10016826f06 dffffc0000000048 0000000000000ce9 0000000041b58ab3
 ffffffff83ffd4e6 ffffffff82f83f50 ffff8800b4137870 0000000000000000
Call Trace:
 [<ffffffff82f85531>] netlink_ack+0x231/0x4b0 net/netlink/af_netlink.c:2278
 [<ffffffff82f932b2>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline]
 [<ffffffff82f932b2>] nfnetlink_rcv+0xaa2/0x1070 net/netfilter/nfnetlink.c:477
 [<ffffffff82f84472>] netlink_unicast_kernel net/netlink/af_netlink.c:1223 [inline]
 [<ffffffff82f84472>] netlink_unicast+0x522/0x760 net/netlink/af_netlink.c:1249
 [<ffffffff82f84f98>] netlink_sendmsg+0x8e8/0xc50 net/netlink/af_netlink.c:1803
 [<ffffffff82de712a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82de712a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82de7396>] sock_write_iter+0x226/0x3b0 net/socket.c:834
 [<ffffffff81519e0c>] new_sync_write fs/read_write.c:478 [inline]
 [<ffffffff81519e0c>] __vfs_write+0x33c/0x450 fs/read_write.c:491
 [<ffffffff8151ba3a>] vfs_write+0x18a/0x530 fs/read_write.c:538
 [<ffffffff8151e129>] SYSC_write fs/read_write.c:585 [inline]
 [<ffffffff8151e129>] SyS_write+0xd9/0x1b0 fs/read_write.c:577
 [<ffffffff8376ef36>] entry_SYSCALL_64_fastpath+0x16/0x76
Code: d7 88 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 b7 88 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  [<ffffffff82f84110>] netlink_getsockbyportid net/netlink/af_netlink.c:1058 [inline]
RIP  [<ffffffff82f84110>] netlink_unicast+0x1c0/0x760 net/netlink/af_netlink.c:1243
 RSP <ffff8800b41377f8>
---[ end trace f685e72746d61d4e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..