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: 0 PID: 2393 Comm: syz-executor4 Not tainted 4.16.0-rc7+ #291 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d 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+0x33e/0xc10 net/core/sock.c:513 dccp_v4_rcv+0xf5f/0x1c80 net/dccp/ipv4.c:874 ip_local_deliver_finish+0x2f1/0xc50 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+0xa36/0x2040 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:288 [inline] ip_rcv+0xb76/0x1820 net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x1a41/0x3460 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+0x792/0x1910 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:1040 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:726 [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 SYSC_sendto+0x361/0x5c0 net/socket.c:1748 SyS_sendto+0x40/0x50 net/socket.c:1716 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x455269 RSP: 002b:00007fd04c3edc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd04c3ee6d4 RCX: 0000000000455269 RDX: 00000000000000dd RSI: 00000000200003c0 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000020000000 R09: 0000000000000010 R10: 0000000004000040 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004f4 R14: 00000000006f9780 R15: 0000000000000000 dccp_close: ABORT with 1 bytes unread netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. IPVS: set_ctl: invalid protocol: 41 172.20.20.25:20000 sed IPVS: set_ctl: invalid protocol: 41 172.20.20.25:20000 sed netlink: 'syz-executor6': attribute type 11 has an invalid length. device bridge0 entered promiscuous mode netlink: 'syz-executor6': attribute type 11 has an invalid length. device bridge0 left promiscuous mode device bridge0 entered promiscuous mode device bridge0 left promiscuous mode TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor6': attribute type 3 has an invalid length. IPVS: set_ctl: invalid protocol: 59 224.0.0.2:20000 lc netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor6': attribute type 3 has an invalid length. IPVS: set_ctl: invalid protocol: 59 224.0.0.2:20000 lc netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. kernel msg: ebtables bug: please report to author: Wrong len argument kernel msg: ebtables bug: please report to author: Wrong len argument netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. netlink: 'syz-executor3': attribute type 1 has an invalid length. device lo left promiscuous mode kernel msg: ebtables bug: please report to author: counter_offset != totalcnt