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: 6206 Comm: syz-executor0 Not tainted 4.16.0+ #294 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+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 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+0x767/0x8b0 net/socket.c:2117 __sys_sendmsg+0x105/0x250 net/socket.c:2155 SYSC_sendmsg net/socket.c:2164 [inline] SyS_sendmsg+0x29/0x30 net/socket.c:2162 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4552d9 RSP: 002b:00007fed5ad90c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fed5ad916d4 RCX: 00000000004552d9 RDX: 0000000004000000 RSI: 0000000020000580 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d6 R14: 00000000006fa4b0 R15: 0000000000000000 device lo entered promiscuous mode device lo left promiscuous mode dccp_close: ABORT with 1 bytes unread device lo entered promiscuous mode netlink: 8 bytes leftover after parsing attributes in process `syz-executor3'. kernel msg: ebtables bug: please report to author: Entries_size never zero kernel msg: ebtables bug: please report to author: Entries_size never zero netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 'syz-executor3': attribute type 16 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 'syz-executor3': attribute type 16 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor4': attribute type 3 has an invalid length. netlink: 'syz-executor4': attribute type 3 has an invalid length. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'. xt_cluster: you have exceeded the maximum number of cluster nodes (4095 > 32) xt_cluster: you have exceeded the maximum number of cluster nodes (4095 > 32) netlink: 'syz-executor4': attribute type 21 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor5': attribute type 3 has an invalid length. netlink: 'syz-executor4': attribute type 21 has an invalid length. dccp_v6_rcv: dropped packet with invalid checksum kernel msg: ebtables bug: please report to author: Wrong len argument dccp_v6_rcv: dropped packet with invalid checksum kernel msg: ebtables bug: please report to author: bad policy kernel msg: ebtables bug: please report to author: Wrong len argument kernel msg: ebtables bug: please report to author: bad policy sctp: [Deprecated]: syz-executor6 (pid 6894) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor6 (pid 6905) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead ip6gretap0: FDB only supports static addresses ip6gretap0: FDB only supports static addresses IPVS: length: 4096 != 8 IPVS: length: 4096 != 8 kernel msg: ebtables bug: please report to author: Wrong len argument IPVS: set_ctl: invalid protocol: 255 172.20.20.12:20000 sed kernel msg: ebtables bug: please report to author: Wrong len argument IPVS: set_ctl: invalid protocol: 255 172.20.20.12:20000 sed