TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
WARNING: CPU: 0 PID: 9 at net/core/stream.c:206 sk_stream_kill_queues+0x3dd/0x530 net/core/stream.c:206
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.1.0-rc7+ #165
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x45 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:sk_stream_kill_queues+0x3dd/0x530 net/core/stream.c:206
Code: 48 c1 ea 03 0f b6 04 02 84 c0 74 04 3c 03 7e 41 44 8b a3 f8 01 00 00 e9 5f ff ff ff e8 9c 31 f8 fb 0f 0b eb 96 e8 93 31 f8 fb <0f> 0b eb a1 e8 8a 31 f8 fb 0f 0b e9 9f fe ff ff 4c 89 ef e8 0b c0
RSP: 0018:ffff8880a98af3d0 EFLAGS: 00010206
RAX: ffff8880a98a2240 RBX: 0000000000000000 RCX: ffffffff85785aed
RDX: 0000000000000100 RSI: ffffffff85785b4d RDI: 0000000000000005
RBP: ffff8880a98af410 R08: ffff8880a98a2240 R09: ffffed1014c0d176
R10: ffffed1014c0d175 R11: ffff8880a6068baf R12: 000000000000001d
R13: ffff8880a6068278 R14: ffffffff8b14e820 R15: ffff8880a60681b8
 inet_csk_destroy_sock+0x1af/0x450 net/ipv4/inet_connection_sock.c:847
 tcp_done+0x27b/0x310 net/ipv4/tcp.c:3793
 tcp_reset+0x111/0x4b0 net/ipv4/tcp_input.c:4054
 tcp_validate_incoming+0xa2d/0x1660 net/ipv4/tcp_input.c:5414
 tcp_rcv_state_process+0xb57/0x4e05 net/ipv4/tcp_input.c:6115
 tcp_v6_do_rcv+0x7da/0x12c0 net/ipv6/tcp_ipv6.c:1362
 tcp_v6_rcv+0x2c7c/0x3580 net/ipv6/tcp_ipv6.c:1569
 ip6_protocol_deliver_rcu+0x303/0x16c0 net/ipv6/ip6_input.c:394
 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434
 NF_HOOK include/linux/netfilter.h:296 [inline]
 NF_HOOK include/linux/netfilter.h:290 [inline]
 ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:443
 dst_input include/net/dst.h:439 [inline]
 ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:296 [inline]
 NF_HOOK include/linux/netfilter.h:290 [inline]
 ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4990
 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5102
 process_backlog+0x206/0x750 net/core/dev.c:5942
 napi_poll net/core/dev.c:6365 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6431
 __do_softirq+0x266/0x95a kernel/softirq.c:293
 run_ksoftirqd kernel/softirq.c:655 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:647
 smpboot_thread_fn+0x6ab/0xa40 kernel/smpboot.c:164
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..