[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.932262] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.875169] random: sshd: uninitialized urandom read (32 bytes read) [ 21.289969] random: sshd: uninitialized urandom read (32 bytes read) [ 21.724942] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 27.318055] urandom_read: 1 callbacks suppressed [ 27.318061] random: sshd: uninitialized urandom read (32 bytes read) [ 27.407049] IPVS: ftp: loaded support on port[0] = 21 [ 27.504680] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.511055] bridge0: port 1(bridge_slave_0) entered disabled state [ 27.517849] device bridge_slave_0 entered promiscuous mode [ 27.530667] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.537129] bridge0: port 2(bridge_slave_1) entered disabled state [ 27.544061] device bridge_slave_1 entered promiscuous mode [ 27.556974] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 27.570970] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 27.604358] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 27.619780] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 27.667141] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 27.674307] team0: Port device team_slave_0 added [ 27.686849] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 27.693947] team0: Port device team_slave_1 added [ 27.706886] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 27.721307] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 27.735980] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 27.751184] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported [ 27.813708] ip (4394) used greatest stack depth: 17584 bytes left [ 27.839537] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.845943] bridge0: port 2(bridge_slave_1) entered forwarding state [ 27.852635] bridge0: port 1(bridge_slave_0) entered blocking state RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 27.858998] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 28.168383] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 28.174513] 8021q: adding VLAN 0 to HW filter on device bond0 [ 28.209239] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.243951] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.251259] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 28.281144] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 28.287253] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 28.463214] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 28.468903] 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() [ 28.483205] CPU: 0 PID: 4564 Comm: syz-executor234 Not tainted 4.18.0-rc8+ #178 [ 28.490651] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.500204] Call Trace: [ 28.502777] [ 28.504916] dump_stack+0x1c9/0x2b4 [ 28.508529] ? dump_stack_print_info.cold.2+0x52/0x52 [ 28.513906] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.519446] ? tfrc_rx_handle_loss+0x67c/0x1eb0 [ 28.524232] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 28.529417] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 28.534195] ? dccp_parse_options+0x493/0x11f0 [ 28.538772] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 28.543830] dccp_deliver_input_to_ccids+0xf0/0x280 [ 28.548905] dccp_rcv_established+0x87/0xb0 [ 28.553439] dccp_v4_do_rcv+0x153/0x180 [ 28.557512] __sk_receive_skb+0x3c0/0xd90 [ 28.561755] ? __inet_lookup_established+0x462/0x690 [ 28.566866] ? sk_free+0x50/0x50 [ 28.570231] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 28.574826] ? reqsk_fastopen_remove+0x680/0x680 [ 28.579579] ? lock_downgrade+0x8f0/0x8f0 [ 28.583879] ? dccp_invalid_packet+0x64/0x890 [ 28.588366] dccp_v4_rcv+0x10f9/0x1f58 [ 28.592247] ? dccp_v4_err+0x1860/0x1860 [ 28.596408] ? lock_release+0xa30/0xa30 [ 28.600377] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.606011] ? ip_local_deliver+0x513/0x750 [ 28.610516] ip_local_deliver_finish+0x2eb/0xda0 [ 28.615263] ? ip_sublist_rcv_finish+0x3e0/0x3e0 [ 28.620008] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 28.625008] ? nf_hook_slow+0x11e/0x1c0 [ 28.629076] ip_local_deliver+0x1e9/0x750 [ 28.633208] ? ip_call_ra_chain+0x730/0x730 [ 28.637524] ? ip_sublist_rcv_finish+0x3e0/0x3e0 [ 28.642266] ? lock_release+0xa30/0xa30 [ 28.646225] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.651475] ip_rcv_finish+0x1f9/0x300 [ 28.655419] ip_rcv+0xed/0x610 [ 28.658670] ? ip_local_deliver+0x750/0x750 [ 28.662979] ? ip_rcv_finish_core.isra.16+0x1f10/0x1f10 [ 28.668525] ? lock_acquire+0x1e4/0x540 [ 28.672482] ? process_backlog+0x1a6/0x760 [ 28.676703] __netif_receive_skb_one_core+0x14d/0x200 [ 28.681885] ? __netif_receive_skb_core+0x3af0/0x3af0 [ 28.687062] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 28.691634] __netif_receive_skb+0x2c/0x1e0 [ 28.695949] process_backlog+0x219/0x760 [ 28.700000] ? do_raw_spin_unlock+0xa7/0x2f0 [ 28.704524] net_rx_action+0x7a5/0x1920 [ 28.708485] ? napi_complete_done+0x6d0/0x6d0 [ 28.712967] ? kasan_check_write+0x14/0x20 [ 28.717274] ? do_raw_spin_lock+0xc1/0x200 [ 28.721502] ? trace_hardirqs_on+0xd/0x10 [ 28.725633] ? __run_timers+0xa37/0xc70 [ 28.730204] ? __bpf_trace_timer_expire_entry+0x30/0x30 [ 28.735562] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 28.740571] ? enqueue_hrtimer+0x18e/0x540 [ 28.744803] ? kasan_check_write+0x14/0x20 [ 28.749024] ? do_raw_spin_lock+0xc1/0x200 [ 28.753252] ? clockevents_program_event+0x158/0x370 [ 28.758348] ? lock_downgrade+0x8f0/0x8f0 [ 28.762531] ? pvclock_read_flags+0x160/0x160 [ 28.767133] ? hrtimer_start_range_ns+0xd20/0xd20 [ 28.772034] ? __local_bh_enable+0xef/0x130 [ 28.776365] ? __do_softirq+0x780/0xb17 [ 28.780330] ? kasan_check_write+0x14/0x20 [ 28.784550] ? rcu_dynticks_eqs_enter+0x22/0x30 [ 28.789201] ? rcu_nmi_exit+0x259/0x2d0 [ 28.793156] ? rcu_idle_enter+0x480/0x480 [ 28.797288] ? clockevents_program_event+0x140/0x370 [ 28.802488] ? tick_program_event+0xb2/0x130 [ 28.807023] ? do_softirq_own_stack+0x2a/0x40 [ 28.811505] __do_softirq+0x2e8/0xb17 [ 28.815300] ? __irqentry_text_end+0x1f97a8/0x1f97a8 [ 28.820403] ? irq_exit+0xbb/0x210 [ 28.823934] ? smp_apic_timer_interrupt+0x186/0x730 [ 28.829019] ? smp_call_function_single_interrupt+0x660/0x660 [ 28.834939] ? _raw_spin_unlock+0x22/0x30 [ 28.839179] ? handle_edge_irq+0x330/0x870 [ 28.843566] ? task_prio+0x50/0x50 [ 28.847104] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.851937] do_softirq_own_stack+0x2a/0x40 [ 28.856236] [ 28.858461] do_softirq.part.18+0x155/0x1a0 [ 28.862764] ? ip_finish_output2+0xa87/0x1860 [ 28.867243] __local_bh_enable_ip+0x1ec/0x230 [ 28.871720] ip_finish_output2+0xaba/0x1860 [ 28.876124] ? nf_conntrack_in+0x9ab/0x1150 [ 28.880438] ? ip_copy_metadata+0xc50/0xc50 [ 28.884933] ? nf_ct_deliver_cached_events+0x558/0x7d0 [ 28.890206] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.895731] ? ipv4_mtu+0x37d/0x590 [ 28.899341] ? xfrm_policy_lookup+0x80/0x80 [ 28.903652] ? ip_route_input_noref+0x270/0x270 [ 28.908309] ip_finish_output+0x841/0xfa0 [ 28.912538] ? ip_finish_output+0x841/0xfa0 [ 28.916846] ? ip_fragment.constprop.49+0x240/0x240 [ 28.921845] ? ip_vs_remote_request4+0xc0/0xc0 [ 28.926409] ? ip_vs_remote_request4+0x86/0xc0 [ 28.930970] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 28.936142] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 28.941136] ? nf_hook_slow+0x11e/0x1c0 [ 28.945091] ip_output+0x223/0x880 [ 28.948609] ? __ip_local_out+0x5e3/0xb50 [ 28.952736] ? ip_mc_output+0x15d0/0x15d0 [ 28.956862] ? ip_fragment.constprop.49+0x240/0x240 [ 28.961965] ? ip_route_output_key_hash_rcu+0x33a0/0x33a0 [ 28.967496] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 28.973020] ip_local_out+0xc5/0x1b0 [ 28.976720] __ip_queue_xmit+0x9b6/0x1f20 [ 28.980849] ? ip_build_and_send_pkt+0xc80/0xc80 [ 28.985588] ? __skb_checksum+0x8f0/0x8f0 [ 28.989716] ? skb_send_sock+0x50/0x50 [ 28.993584] ? reqsk_fastopen_remove+0x680/0x680 [ 28.998324] ? dccp_insert_option_padding+0xbc/0xe0 [ 29.003327] ip_queue_xmit+0x56/0x70 [ 29.007023] dccp_transmit_skb+0x999/0x12e0 [ 29.011323] dccp_xmit_packet+0x25e/0x7b0 [ 29.015456] ? kasan_check_write+0x14/0x20 [ 29.019673] ? do_raw_spin_lock+0xc1/0x200 [ 29.023888] ? dccp_send_sync+0x270/0x270 [ 29.028020] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 29.033019] ? ccid3_hc_tx_send_packet+0x35a/0x880 [ 29.037938] dccp_write_xmit+0x190/0x1f0 [ 29.041984] dccp_sendmsg+0x8db/0x1030 [ 29.045921] ? dccp_getsockopt+0xf0/0xf0 [ 29.049973] ? rw_copy_check_uvector+0x30d/0x3e0 [ 29.054710] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.060233] ? import_iovec+0x269/0x470 [ 29.064187] ? dup_iter+0x270/0x270 [ 29.067796] inet_sendmsg+0x1a1/0x690 [ 29.071581] ? copy_msghdr_from_user+0x3c4/0x580 [ 29.076319] ? ipip_gro_receive+0x100/0x100 [ 29.080711] ? move_addr_to_kernel.part.18+0x100/0x100 [ 29.085983] ? security_socket_sendmsg+0x94/0xc0 [ 29.090725] ? ipip_gro_receive+0x100/0x100 [ 29.095038] sock_sendmsg+0xd5/0x120 [ 29.098739] ___sys_sendmsg+0x7fd/0x930 [ 29.102696] ? copy_msghdr_from_user+0x580/0x580 [ 29.107481] ? __might_fault+0x1a3/0x1e0 [ 29.111540] ? ip_getsockopt+0xd3/0x2b0 [ 29.115510] ? __fget_light+0x2f7/0x440 [ 29.119465] ? fget_raw+0x20/0x20 [ 29.122898] ? udp_getsockopt+0x69/0xa0 [ 29.126863] ? ipv6_getsockopt+0xd9/0x320 [ 29.131001] ? do_ipv6_getsockopt.isra.6+0x3500/0x3500 [ 29.136260] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.141788] ? sockfd_lookup_light+0xc5/0x160 [ 29.146366] __sys_sendmsg+0x11d/0x290 [ 29.150238] ? __ia32_sys_shutdown+0x80/0x80 [ 29.154638] ? __x64_sys_futex+0x47f/0x6a0 [ 29.158860] ? syscall_slow_exit_work+0x500/0x500 [ 29.163682] __x64_sys_sendmsg+0x78/0xb0 [ 29.167732] do_syscall_64+0x1b9/0x820 [ 29.171599] ? finish_task_switch+0x1d3/0x870 [ 29.176080] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.180991] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.185900] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 29.190909] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.195738] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.200918] RIP: 0033:0x446a89 [ 29.204085] Code: e8 cc b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 29.223348] RSP: 002b:00007fed940f9da8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 29.231150] RAX: ffffffffffffffda RBX: 00000000006dec58 RCX: 0000000000446a89 [ 29.238404] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000005 [ 29.245702] RBP: 00000000006dec50 R08: 0000000000000000 R09: 0000000000000000 [ 29.252963] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dec5c [ 29.260218] R13: 00000000004b0200 R14: 0000000020001f80 R15: 0000000000000001