TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 15471 Comm: syz-executor.2 Not tainted 4.14.144 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a95b8340 task.stack: ffff888055d28000
RIP: 0010:do_tcp_sendpages+0x33d/0x18f0 net/ipv4/tcp.c:967
RSP: 0018:ffff888055d2f898 EFLAGS: 00010202
RAX: 0000000000000010 RBX: 0000000000000000 RCX: ffffc9000a862000
RDX: 00000000000003bd RSI: ffffffff8523f03b RDI: 0000000000000080
RBP: ffff888055d2f9c0 R08: ffff8880a95b8340 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8880a95b8340 R12: 0000000000005555
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888085b4d300
FS:  00007f9f8aa84700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564c5eaabae8 CR3: 00000000a91fb000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tls_push_sg+0x1e1/0x660 net/tls/tls_main.c:120
 tls_push_record+0xa4a/0x1210 net/tls/tls_sw.c:287
 tls_sw_sendmsg+0x9e8/0x1020 net/tls/tls_sw.c:457
 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 SYSC_sendto+0x206/0x310 net/socket.c:1763
 SyS_sendto+0x40/0x50 net/socket.c:1731
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4598e9
RSP: 002b:00007f9f8aa83c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004598e9
RDX: ffffffffffffffc1 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: fffffffffffffe5b
R10: 0000000000000040 R11: 0000000000000246 R12: 00007f9f8aa846d4
R13: 00000000004c7880 R14: 00000000004dd188 R15: 00000000ffffffff
Code: ff ff 48 0f 44 d8 e8 c3 f2 38 fc 4d 85 e4 0f 84 9b 03 00 00 e8 b5 f2 38 fc 48 8d bb 80 00 00 00 44 8b 65 a8 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 74 08 3c 03 0f 8e 85 11 00 00 44 2b a3 80 
RIP: do_tcp_sendpages+0x33d/0x18f0 net/ipv4/tcp.c:967 RSP: ffff888055d2f898
kobject: 'loop4' (ffff8880a4ac91e0): kobject_uevent_env
---[ end trace 5bf6c7f4da81be1b ]---
kobject: 'loop4' (ffff8880a4ac91e0): fill_kobj_path: path = '/devices/virtual/block/loop4'