nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
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
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 4.18.0-next-20180816+ #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigurg_to_task+0xf5/0x4d0 fs/fcntl.c:810
Code: d1 99 b1 ff 45 84 f6 0f 84 52 03 00 00 e8 f3 98 b1 ff 49 8d bf 58 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 91 03 00 00 48 8d 43 c0 4d 8b b7 58 06 00 00 48
RSP: 0018:ffff8801d9eeebe0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d9eeec50 RCX: ffffffff81cb29a0
RDX: 00000000000000cb RSI: ffffffff81cb263d RDI: 0000000000000658
RBP: ffff8801d9eeec78 R08: ffff8801d9ee0240 R09: ffffed003b6046d6
R10: ffffed003b6046d6 R11: ffff8801db0236b3 R12: 1ffff1003b3ddd7e
R13: ffff8801c867a888 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4b7c99db8 CR3: 000000019a700000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 send_sigurg+0x342/0x480 fs/fcntl.c:833
 sk_send_sigurg+0xd2/0x3d0 net/core/sock.c:2731
 tcp_check_urg net/ipv4/tcp_input.c:5266 [inline]
 tcp_urg+0x3c3/0xba0 net/ipv4/tcp_input.c:5307
 tcp_rcv_established+0xd45/0x2130 net/ipv4/tcp_input.c:5637
 tcp_v4_do_rcv+0x635/0x8f0 net/ipv4/tcp_ipv4.c:1532
 tcp_v4_rcv+0x2ff9/0x3a90 net/ipv4/tcp_ipv4.c:1824
 ip_local_deliver_finish+0x2eb/0xda0 net/ipv4/ip_input.c:215
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415
 NF_HOOK include/linux/netfilter.h:287 [inline]
 ip_rcv+0xed/0x610 net/ipv4/ip_input.c:524
 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4892
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5002
 process_backlog+0x219/0x760 net/core/dev.c:5808
 napi_poll net/core/dev.c:6228 [inline]
 net_rx_action+0x799/0x1900 net/core/dev.c:6294
 __do_softirq+0x2eb/0xa74 kernel/softirq.c:292
 run_ksoftirqd+0x88/0x100 kernel/softirq.c:653
 smpboot_thread_fn+0x425/0x880 kernel/smpboot.c:164
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 1544800f76bd070c ]---
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigurg_to_task+0xf5/0x4d0 fs/fcntl.c:810
Code: d1 99 b1 ff 45 84 f6 0f 84 52 03 00 00 e8 f3 98 b1 ff 49 8d bf 58 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 91 03 00 00 48 8d 43 c0 4d 8b b7 58 06 00 00 48
RSP: 0018:ffff8801d9eeebe0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d9eeec50 RCX: ffffffff81cb29a0
RDX: 00000000000000cb RSI: ffffffff81cb263d RDI: 0000000000000658
RBP: ffff8801d9eeec78 R08: ffff8801d9ee0240 R09: ffffed003b6046d6
R10: ffffed003b6046d6 R11: ffff8801db0236b3 R12: 1ffff1003b3ddd7e
R13: ffff8801c867a888 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4b7c99db8 CR3: 000000019a700000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400