kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
TCP: request_sock_TCP: Possible SYN flooding on port 20030. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCP: Possible SYN flooding on port 20030. Sending cookies.  Check SNMP counters.
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 11167 Comm: syz-executor6 Not tainted 4.15.0-rc8+ #197
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strlen+0x1f/0xa0 lib/string.c:479
RSP: 0018:ffff8801cd85f760 EFLAGS: 00010286
RAX: 00000000000000f4 RBX: ffff8801d7cdcdc0 RCX: 000000000000001e
RDX: dffffc0000000000 RSI: ffffc90003426000 RDI: 00000000000000f4
RBP: ffff8801cd85f778 R08: ffffffff84b08640 R09: 0000000000000004
R10: ffff8801cd85f920 R11: 0000000000000005 R12: ffff8801cd85f898
R13: 00000000000000f4 R14: 0000000000000040 R15: 1ffff10039b0bef7
FS:  00007fca76874700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000071801c CR3: 00000001c58b4004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strlen include/linux/string.h:266 [inline]
 netlink_ack+0x120/0xa10 net/netlink/af_netlink.c:2357
 netlink_rcv_skb+0x2d1/0x400 net/netlink/af_netlink.c:2448
 xfrm_netlink_rcv+0x6f/0x90 net/xfrm/xfrm_user.c:2599
 netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline]
 netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334
 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2020
 __sys_sendmsg+0xe5/0x210 net/socket.c:2054
 SYSC_sendmsg net/socket.c:2065 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2061
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452e99
RSP: 002b:00007fca76873c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99
RDX: 0000000000000000 RSI: 0000000020f1efc8 RDI: 0000000000000015
RBP: 00000000000004e5 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f5618
R13: 00000000ffffffff R14: 00007fca768746d4 R15: 0000000000000000
Code: 37 ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 f9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 48 89 f8 48 89 e5 41 54 53 48 83 ec 08 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 04 84 d2 75 4b 80 38 00 
RIP: strlen+0x1f/0xa0 lib/string.c:479 RSP: ffff8801cd85f760
---[ end trace fa308501e6e2dd03 ]---