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: 6415 Comm: syz-executor2 Not tainted 4.15.0+ #221 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+0x194/0x257 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:908 [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:216 NF_HOOK include/linux/netfilter.h:288 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:449 [inline] ip_rcv_finish+0xa36/0x2040 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:288 [inline] ip_rcv+0xc5a/0x1840 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4547 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4612 process_backlog+0x203/0x740 net/core/dev.c:5292 napi_poll net/core/dev.c:5690 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5756 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1151 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+0x864/0xd10 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:443 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c0/0x18e0 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+0x95f/0xdc0 net/dccp/proto.c:813 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 sock_write_iter+0x31a/0x5d0 net/socket.c:909 call_write_iter include/linux/fs.h:1781 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x4537d9 RSP: 002b:00007f3fbfcdec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 00000000004537d9 RDX: 0000000000000001 RSI: 0000000020ef9fff RDI: 0000000000000015 RBP: 0000000000000059 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef8f8 R13: 00000000ffffffff R14: 00007f3fbfcdf6d4 R15: 0000000000000008 dccp_close: ABORT with 8218 bytes unread can: request_module (can-proto-4) failed. can: request_module (can-proto-4) failed. device syz0 entered promiscuous mode device syz0 left promiscuous mode IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 IPv4: Oversized IP packet from 127.0.0.1 kauditd_printk_skb: 29 callbacks suppressed audit: type=1400 audit(1518216407.370:51): avc: denied { net_bind_service } for pid=6599 comm="syz-executor2" capability=10 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 openvswitch: netlink: Message has 4 unknown bytes. sctp: [Deprecated]: syz-executor0 (pid 6707) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor0 (pid 6718) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor0 (pid 6707) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead netlink: 'syz-executor1': attribute type 3 has an invalid length. sctp: [Deprecated]: syz-executor0 (pid 6707) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 'syz-executor1': attribute type 3 has an invalid length. mip6: mip6_destopt_init_state: state's mode is not 2: 0 mip6: mip6_destopt_init_state: state's mode is not 2: 0 netlink: 'syz-executor5': attribute type 11 has an invalid length. netlink: 'syz-executor5': attribute type 11 has an invalid length. Trying to set illegal importance in message netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. dccp_close: ABORT with 1 bytes unread netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. Trying to set illegal importance in message audit: type=1400 audit(1518216408.220:52): avc: denied { setopt } for pid=6815 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'. ipt_CLUSTERIP: no config found for 255.255.255.255, need 'new' ipt_CLUSTERIP: no config found for 255.255.255.255, need 'new' sctp: [Deprecated]: syz-executor5 (pid 6986) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead audit: type=1400 audit(1518216408.858:53): avc: denied { map } for pid=6983 comm="syz-executor5" path="socket:[17177]" dev="sockfs" ino=17177 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=rawip_socket permissive=1 sctp: [Deprecated]: syz-executor5 (pid 7004) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead ip_tables: iptables: counters copy to user failed while replacing table ip_tables: iptables: counters copy to user failed while replacing table xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables audit: type=1400 audit(1518216409.514:54): avc: denied { connect } for pid=7191 comm="syz-executor7" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 ICMPv6: NA: 00:00:00:00:00:00 advertised our address fe80::aa on syz0! ip6_tables: ip6tables: counters copy to user failed while replacing table audit: type=1400 audit(1518216410.362:55): avc: denied { create } for pid=7430 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 audit: type=1400 audit(1518216410.412:56): avc: denied { write } for pid=7430 comm="syz-executor2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. xt_dscp: dscp 49 out of range netlink: 'syz-executor7': attribute type 21 has an invalid length. netlink: 2 bytes leftover after parsing attributes in process `syz-executor6'. netlink: 'syz-executor7': attribute type 21 has an invalid length. device syz2 entered promiscuous mode sctp: [Deprecated]: syz-executor5 (pid 7564) Use of int in max_burst socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor5 (pid 7554) Use of int in max_burst socket option. Use struct sctp_assoc_value instead device syz2 left promiscuous mode netlink: 'syz-executor4': attribute type 1 has an invalid length. netlink: 'syz-executor4': attribute type 1 has an invalid length. can: request_module (can-proto-5) failed. can: request_module (can-proto-5) failed. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1042 sclass=netlink_route_socket pig=7664 comm=syz-executor6 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=1042 sclass=netlink_route_socket pig=7666 comm=syz-executor6 Cannot find set identified by id 0 to match netlink: 'syz-executor3': attribute type 10 has an invalid length. netlink: 'syz-executor3': attribute type 10 has an invalid length. RDS: rds_bind could not find a transport for 172.20.0.187, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 172.20.0.187, load rds_tcp or rds_rdma? xt_SECMARK: invalid security context 'system_u:object_r:ld' audit: type=1400 audit(1518216412.681:57): avc: denied { net_broadcast } for pid=8105 comm="syz-executor6" capability=11 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 xt_l2tp: invalid flags combination: 0 xt_l2tp: invalid flags combination: 0 x_tables: ip6_tables: icmp6 match: only valid for protocol 58 x_tables: ip6_tables: icmp6 match: only valid for protocol 58 netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor3'. validate_nla: 4 callbacks suppressed netlink: 'syz-executor2': attribute type 8 has an invalid length. netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor3'. sctp: [Deprecated]: syz-executor5 (pid 8727) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead sctp: [Deprecated]: syz-executor5 (pid 8741) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead netlink: 'syz-executor1': attribute type 21 has an invalid length. net_ratelimit: 10 callbacks suppressed openvswitch: netlink: Flow set message rejected, Key attribute missing. netlink: 'syz-executor1': attribute type 21 has an invalid length. openvswitch: netlink: Flow set message rejected, Key attribute missing. xt_CONNSECMARK: invalid mode: 0 xt_CONNSECMARK: invalid mode: 0 tc_ctl_action: received NO action attribs tc_ctl_action: received NO action attribs TCP: request_sock_TCPv6: Possible SYN flooding on port 20014. Sending cookies. Check SNMP counters. l2tp_core: tunl 2: fd 19 wrong protocol, got 6, expected 17 l2tp_core: tunl 2: fd 22 wrong protocol, got 6, expected 17 x_tables: ip_tables: REDIRECT target: used from hooks OUTPUT/POSTROUTING, but only usable from PREROUTING/OUTPUT audit: type=1400 audit(1518216415.975:58): avc: denied { bind } for pid=9030 comm="syz-executor3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1