IPVS: ftp: loaded support on port[0] = 21
BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:425/tfrc_rx_hist_sample_rtt()
CPU: 1 PID: 17656 Comm: syz-executor5 Not tainted 4.16.0+ #294
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1a7/0x27d lib/dump_stack.c:53
 tfrc_rx_hist_sample_rtt+0x407/0x4d0 net/dccp/ccids/lib/packet_history.c:422
 ccid3_hc_rx_packet_recv+0x696/0xeb3 net/dccp/ccids/ccid3.c:765
 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline]
 dccp_deliver_input_to_ccids+0xd9/0x250 net/dccp/input.c:180
 dccp_rcv_established+0x88/0xb0 net/dccp/input.c:378
 dccp_v4_do_rcv+0x135/0x160 net/dccp/ipv4.c:653
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __sk_receive_skb+0x2ec/0xc00 net/core/sock.c:513
 dccp_v4_rcv+0xf6c/0x1cb0 net/dccp/ipv4.c:874
 ip_local_deliver_finish+0x2ed/0xbf0 net/ipv4/ip_input.c:215
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:256
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish+0x719/0x2030 net/ipv4/ip_input.c:396
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_rcv+0xb7f/0x1820 net/ipv4/ip_input.c:492
 __netif_receive_skb_core+0x1a52/0x3480 net/core/dev.c:4592
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4657
 process_backlog+0x203/0x740 net/core/dev.c:5337
 napi_poll net/core/dev.c:5735 [inline]
 net_rx_action+0x788/0x1910 net/core/dev.c:5801
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1045
 </IRQ>
 do_softirq.part.19+0x14d/0x190 kernel/softirq.c:329
 do_softirq kernel/softirq.c:177 [inline]
 __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:728 [inline]
 ip_finish_output2+0x962/0x1550 net/ipv4/ip_output.c:231
 ip_finish_output+0x864/0xd60 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:277 [inline]
 ip_output+0x1d2/0x860 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
 ip_queue_xmit+0x8c0/0x1920 net/ipv4/ip_output.c:504
 dccp_transmit_skb+0x9ac/0x10f0 net/dccp/output.c:142
 dccp_xmit_packet+0x215/0x740 net/dccp/output.c:281
 dccp_write_xmit+0x17d/0x1d0 net/dccp/output.c:363
 dccp_sendmsg+0x9da/0xe60 net/dccp/proto.c:818
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:639
 ___sys_sendmsg+0x320/0x8b0 net/socket.c:2117
 __sys_sendmmsg+0x21a/0x660 net/socket.c:2212
 SYSC_sendmmsg net/socket.c:2241 [inline]
 SyS_sendmmsg+0x32/0x40 net/socket.c:2238
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4552d9
RSP: 002b:00007f1f320cfc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f1f320d06d4 RCX: 00000000004552d9
RDX: 0000000000000003 RSI: 00000000200040c0 RDI: 0000000000000015
RBP: 000000000072bf58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000080 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004c6 R14: 00000000006fa330 R15: 0000000000000001
dccp_close: ABORT with 1 bytes unread
dccp_close: ABORT with 2 bytes unread
xt_time: unknown flags 0x34
xt_time: unknown flags 0x34
device lo left promiscuous mode
IPVS: set_ctl: invalid protocol: 51 224.0.0.1:20000 fo
validate_nla: 5 callbacks suppressed
netlink: 'syz-executor5': attribute type 1 has an invalid length.
netlink: 'syz-executor5': attribute type 1 has an invalid length.
TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
nla_parse: 5 callbacks suppressed
netlink: 57 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 57 bytes leftover after parsing attributes in process `syz-executor5'.