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
Modules linked in:
CPU: 0 PID: 6219 Comm: syz-executor.4 Not tainted 4.4.174+ #4
task: ffff8800a52b8000 task.stack: ffff8801d0ea0000
RIP: 0010:[<ffffffff822eee2b>]  [<ffffffff822eee2b>] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline]
RIP: 0010:[<ffffffff822eee2b>]  [<ffffffff822eee2b>] netlink_unicast+0x1cb/0x700 net/netlink/af_netlink.c:1297
RSP: 0018:ffff8801d0ea76c8  EFLAGS: 00010216
RAX: dffffc0000000048 RBX: 0000000000000000 RCX: ffffc90004382000
RDX: 0000000000000982 RSI: ffffffff822eee24 RDI: ffff8800b2d67218
RBP: ffff8801d0ea7780 R08: 1ffff100168ce682 R09: ffffed00168ce68a
R10: ffffed00168ce689 R11: ffff8800b467344c R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8800b2d67140 R15: 0000000000000263
FS:  00007f4ee42b3700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001a53bf8 CR3: 00000000b4983000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800b46734c0 0000000000000030 0000000000000240 1ffff1003a1d4edf
 dffffc0000000006 dffffc0000000048 0000000041b58ab3 ffffffff82c9f14a
 ffffffff822eec60 ffff8801d0ea7738 0000000000000000 ffff8800b4673400
Call Trace:
 [<ffffffff822f0386>] netlink_ack+0x236/0x4c0 net/netlink/af_netlink.c:2334
 [<ffffffff822ff60d>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:319 [inline]
 [<ffffffff822ff60d>] nfnetlink_rcv+0xbdd/0x12b0 net/netfilter/nfnetlink.c:477
 [<ffffffff822ef137>] netlink_unicast_kernel net/netlink/af_netlink.c:1277 [inline]
 [<ffffffff822ef137>] netlink_unicast+0x4d7/0x700 net/netlink/af_netlink.c:1303
 [<ffffffff822efb86>] netlink_sendmsg+0x6b6/0xc80 net/netlink/af_netlink.c:1859
 [<ffffffff821d838e>] sock_sendmsg_nosec net/socket.c:638 [inline]
 [<ffffffff821d838e>] sock_sendmsg+0xbe/0x110 net/socket.c:648
 [<ffffffff821d8615>] sock_write_iter+0x235/0x3d0 net/socket.c:847
 [<ffffffff81497941>] do_iter_readv_writev+0x141/0x1e0 fs/read_write.c:666
 [<ffffffff81498cf7>] do_readv_writev+0x387/0x6e0 fs/read_write.c:810
 [<ffffffff8149917d>] vfs_writev+0x7d/0xb0 fs/read_write.c:849
 [<ffffffff8149b5fc>] SYSC_writev fs/read_write.c:882 [inline]
 [<ffffffff8149b5fc>] SyS_writev+0xdc/0x260 fs/read_write.c:874
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: ec a7 01 ff 48 8d 55 98 48 89 d9 4c 89 f6 4c 89 e7 e8 fa f6 ff ff 83 f8 01 0f 85 e6 03 00 00 e8 cc a7 01 ff 48 8b 85 70 ff ff ff <0f> b6 00 84 c0 74 08 3c 03 0f 8e 16 04 00 00 48 8b 85 68 ff ff 
RIP  [<ffffffff822eee2b>] netlink_getsockbyportid net/netlink/af_netlink.c:1112 [inline]
RIP  [<ffffffff822eee2b>] netlink_unicast+0x1cb/0x700 net/netlink/af_netlink.c:1297
 RSP <ffff8801d0ea76c8>
---[ end trace e5fd432ad996b378 ]---