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: 16608 Comm: syz-executor3 Not tainted 4.16.0-rc7+ #292 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 device syz_tun entered promiscuous mode netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4592 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4657 netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. 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 netlink: 3 bytes leftover after parsing attributes in process `syz-executor4'. __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 netlink: 11 bytes leftover after parsing attributes in process `syz-executor4'. 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 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047 __sys_sendmsg+0xe5/0x210 net/socket.c:2081 SYSC_sendmsg net/socket.c:2092 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2088 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4552d9 RSP: 002b:00007f8e9458ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8e9458f6d4 RCX: 00000000004552d9 RDX: 0000000000008000 RSI: 0000000020000340 RDI: 0000000000000015 RBP: 000000000072c010 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d3 R14: 00000000006fa468 R15: 0000000000000002 dccp_close: ABORT with 1 bytes unread IPVS: sync thread started: state = MASTER, mcast_ifn = ip_vti0, syncid = 0, id = 0 netlink: 'syz-executor6': attribute type 1 has an invalid length. netlink: 17 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 17 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 164 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 164 bytes leftover after parsing attributes in process `syz-executor7'. bond0 (unregistering): Released all slaves netlink: 'syz-executor2': attribute type 4 has an invalid length. netlink: 28 bytes leftover after parsing attributes in process `syz-executor2'. bridge0: Invalid MTU 1488112902 requested, hw max 65535 netlink: 'syz-executor2': attribute type 4 has an invalid length. netlink: 28 bytes leftover after parsing attributes in process `syz-executor2'. bridge0: Invalid MTU 1488112902 requested, hw max 65535 netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. IPVS: set_ctl: invalid protocol: 0 172.20.20.170:20004 ovf netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. IPVS: set_ctl: invalid protocol: 0 172.20.20.170:20004 ovf kernel msg: ebtables bug: please report to author: entries_size too small kernel msg: ebtables bug: please report to author: entries_size too small IPVS: set_ctl: invalid protocol: 0 0.0.0.0:20001 nq netlink: 60 bytes leftover after parsing attributes in process `syz-executor7'. IPVS: set_ctl: invalid protocol: 0 0.0.0.0:20001 nq IPVS: set_ctl: invalid protocol: 18204 224.0.0.1:20003 nq netlink: 60 bytes leftover after parsing attributes in process `syz-executor7'. IPVS: set_ctl: invalid protocol: 18204 224.0.0.1:20003 nq