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: 9899 Comm: syz-executor7 Not tainted 4.16.0+ #1 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+0x1b9/0x29f lib/dump_stack.c:53 tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c net/dccp/ccids/lib/packet_history.c:422 ccid3_hc_rx_packet_recv+0x5c8/0xed0 net/dccp/ccids/ccid3.c:765 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline] dccp_deliver_input_to_ccids+0xf0/0x280 net/dccp/input.c:180 dccp_rcv_established+0x87/0xb0 net/dccp/input.c:378 dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:653 sk_backlog_rcv include/net/sock.h:909 [inline] __sk_receive_skb+0x3a2/0xd60 net/core/sock.c:513 dccp_v4_rcv+0x1151/0x2048 net/dccp/ipv4.c:874 ip_local_deliver_finish+0x2e3/0xd80 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:288 [inline] ip_local_deliver+0x1e1/0x720 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x81b/0x2200 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:288 [inline] ip_rcv+0xb70/0x143d net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x26f5/0x3630 net/core/dev.c:4592 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4657 process_backlog+0x219/0x760 net/core/dev.c:5337 napi_poll net/core/dev.c:5735 [inline] net_rx_action+0x7b7/0x1930 net/core/dev.c:5801 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1045 do_softirq.part.17+0x14d/0x190 kernel/softirq.c:329 do_softirq arch/x86/include/asm/preempt.h:23 [inline] __local_bh_enable_ip+0x1ec/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+0xab2/0x1840 net/ipv4/ip_output.c:231 ip_finish_output+0x828/0xf80 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x21b/0x850 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 ip_queue_xmit+0x9d0/0x1fa0 net/ipv4/ip_output.c:504 dccp_transmit_skb+0x999/0x12e0 net/dccp/output.c:142 dccp_xmit_packet+0x250/0x790 net/dccp/output.c:281 dccp_write_xmit+0x190/0x1f0 net/dccp/output.c:363 dccp_sendmsg+0x8c7/0x1020 net/dccp/proto.c:818 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 SYSC_sendto net/socket.c:1801 [inline] SyS_sendto+0x40/0x60 net/socket.c:1797 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x455279 RSP: 002b:00007fb8085dec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fb8085df6d4 RCX: 0000000000455279 RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000015 RBP: 000000000072bf58 R08: 00000000200000c0 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004f9 R14: 00000000006fa7f8 R15: 0000000000000001 random: crng init done sctp: [Deprecated]: syz-executor2 (pid 9924) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead dccp_close: ABORT with 11 bytes unread sctp: [Deprecated]: syz-executor2 (pid 9924) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead kernel msg: ebtables bug: please report to author: Wrong len argument IPVS: set_ctl: invalid protocol: 1 172.20.20.170:20003 lc kernel msg: ebtables bug: please report to author: Wrong len argument IPVS: set_ctl: invalid protocol: 1 172.20.20.170:20003 lc can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor7'. IPVS: length: 148 != 8 IPVS: length: 148 != 8 netlink: 4 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor1': attribute type 3 has an invalid length. netlink: 'syz-executor1': attribute type 3 has an invalid length. netlink: 16 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 'syz-executor2': attribute type 29 has an invalid length. netlink: 'syz-executor2': attribute type 29 has an invalid length. x_tables: duplicate underflow at hook 4 IPVS: set_ctl: invalid protocol: 183 0.0.0.255:20003 lblc x_tables: duplicate underflow at hook 4 IPVS: set_ctl: invalid protocol: 183 0.0.0.255:20003 lblc