[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.420376] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.427693] random: sshd: uninitialized urandom read (32 bytes read) [ 25.792167] random: sshd: uninitialized urandom read (32 bytes read) [ 26.350472] random: sshd: uninitialized urandom read (32 bytes read) [ 26.521658] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. [ 31.991821] random: sshd: uninitialized urandom read (32 bytes read) [ 32.087894] IPVS: ftp: loaded support on port[0] = 21 [ 32.217367] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.223800] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.231458] device bridge_slave_0 entered promiscuous mode [ 32.248548] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.254906] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.262168] device bridge_slave_1 entered promiscuous mode [ 32.277432] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.293613] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.334719] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 32.352272] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 32.415553] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 32.422863] team0: Port device team_slave_0 added [ 32.438128] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 32.445496] team0: Port device team_slave_1 added [ 32.460544] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 32.478251] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 32.496438] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.513678] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 32.630799] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.637236] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.644009] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.650369] 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 [ 33.062550] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 33.068780] 8021q: adding VLAN 0 to HW filter on device bond0 [ 33.112254] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.154773] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.162544] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 33.198602] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 33.430925] 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() [ 33.444286] CPU: 0 PID: 4688 Comm: syz-executor722 Not tainted 4.18.0-rc8+ #182 [ 33.451717] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.461048] Call Trace: [ 33.463607] [ 33.465746] dump_stack+0x1c9/0x2b4 [ 33.469357] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.476093] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.481727] ? tfrc_rx_handle_loss+0x67c/0x1eb0 [ 33.486381] ? rcu_is_watching+0x8c/0x150 [ 33.490824] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 33.496003] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 33.500765] ? dccp_parse_options+0x493/0x11f0 [ 33.505330] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 33.510239] dccp_deliver_input_to_ccids+0xf0/0x280 [ 33.515237] dccp_rcv_established+0x87/0xb0 [ 33.519554] dccp_v4_do_rcv+0x153/0x180 [ 33.523512] __sk_receive_skb+0x3c0/0xd90 [ 33.527654] ? __inet_lookup_established+0x462/0x690 [ 33.532740] ? sk_free+0x50/0x50 [ 33.536139] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 33.540626] ? reqsk_fastopen_remove+0x680/0x680 [ 33.545368] ? lock_downgrade+0x8f0/0x8f0 [ 33.549502] ? dccp_invalid_packet+0x64/0x890 [ 33.553981] dccp_v4_rcv+0x10f9/0x1f58 [ 33.557869] ? dccp_v4_err+0x1860/0x1860 [ 33.561916] ? __lock_is_held+0xb5/0x140 [ 33.566041] ip_local_deliver_finish+0x2eb/0xda0 [ 33.570789] ? inet_add_protocol.cold.0+0x21/0x21 [ 33.575617] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.580660] ? nf_hook_slow+0x11e/0x1c0 [ 33.584670] ip_local_deliver+0x1e9/0x750 [ 33.588890] ? nf_conntrack_update+0xc80/0xc80 [ 33.593462] ? ip_call_ra_chain+0x730/0x730 [ 33.597770] ? inet_add_protocol.cold.0+0x21/0x21 [ 33.602594] ? graph_lock+0x170/0x170 [ 33.606395] ? __lock_acquire+0x7fc/0x5020 [ 33.610625] ? select_idle_sibling+0xcc/0xd90 [ 33.615099] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.620624] ip_rcv_finish+0x823/0x2220 [ 33.624584] ? ip_local_deliver_finish+0xda0/0xda0 [ 33.629499] ? lock_downgrade+0x8f0/0x8f0 [ 33.633669] ? kasan_check_read+0x11/0x20 [ 33.637801] ? rcu_is_watching+0x8c/0x150 [ 33.641930] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 33.646320] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.651321] ? nf_hook_slow+0x11e/0x1c0 [ 33.655283] ip_rcv+0xa18/0x1284 [ 33.658636] ? ip_local_deliver+0x750/0x750 [ 33.663022] ? ip_local_deliver_finish+0xda0/0xda0 [ 33.667987] ? __lock_is_held+0xb5/0x140 [ 33.672050] ? ip_local_deliver+0x750/0x750 [ 33.676357] __netif_receive_skb_core+0x23d0/0x35b0 [ 33.681358] ? nf_ingress+0xa30/0xa30 [ 33.685143] ? __lock_acquire+0x7fc/0x5020 [ 33.689359] ? __lock_acquire+0x7fc/0x5020 [ 33.693640] ? print_usage_bug+0xc0/0xc0 [ 33.697701] ? trace_hardirqs_on+0x10/0x10 [ 33.701916] ? print_usage_bug+0xc0/0xc0 [ 33.705978] ? print_usage_bug+0xc0/0xc0 [ 33.710103] ? print_other_cpu_stall+0x4b0/0x4b0 [ 33.714851] ? __lock_acquire+0x7fc/0x5020 [ 33.719073] ? __lock_acquire+0x7fc/0x5020 [ 33.723297] ? print_usage_bug+0xc0/0xc0 [ 33.727346] ? graph_lock+0x170/0x170 [ 33.731129] ? graph_lock+0x170/0x170 [ 33.734912] ? trace_hardirqs_on+0x10/0x10 [ 33.739138] ? graph_lock+0x170/0x170 [ 33.742928] ? find_held_lock+0x36/0x1c0 [ 33.746981] ? print_usage_bug+0xc0/0xc0 [ 33.751038] ? lock_acquire+0x1e4/0x540 [ 33.755009] ? process_backlog+0x1a6/0x760 [ 33.759236] ? kasan_check_read+0x11/0x20 [ 33.763374] ? rcu_is_watching+0x8c/0x150 [ 33.767504] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 33.771898] __netif_receive_skb+0x2c/0x1e0 [ 33.776204] process_backlog+0x219/0x760 [ 33.780253] net_rx_action+0x7da/0x1980 [ 33.784210] ? graph_lock+0x170/0x170 [ 33.788002] ? napi_complete_done+0x6c0/0x6c0 [ 33.792490] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 33.797584] ? find_held_lock+0x36/0x1c0 [ 33.801678] ? lock_downgrade+0x8f0/0x8f0 [ 33.805820] ? kasan_check_read+0x11/0x20 [ 33.809951] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 33.814348] ? rebalance_domains+0x379/0xd90 [ 33.818745] ? load_balance+0x3640/0x3640 [ 33.822880] ? rcu_pm_notify+0xc0/0xc0 [ 33.826754] ? print_usage_bug+0xc0/0xc0 [ 33.830861] ? __do_softirq+0x780/0xb17 [ 33.834828] ? graph_lock+0x170/0x170 [ 33.838609] ? scheduler_ipi+0x1a8/0xa50 [ 33.842654] ? migration_cpu_stop+0x470/0x470 [ 33.847133] ? __lock_is_held+0xb5/0x140 [ 33.851226] __do_softirq+0x2e8/0xb17 [ 33.855023] ? __irqentry_text_end+0x1f97a8/0x1f97a8 [ 33.860111] ? smp_reschedule_interrupt+0xf5/0x670 [ 33.865023] ? smp_thermal_interrupt+0x820/0x820 [ 33.869761] ? _raw_spin_unlock+0x22/0x30 [ 33.873900] ? handle_edge_irq+0x330/0x870 [ 33.878129] ? task_prio+0x50/0x50 [ 33.881677] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.886614] do_softirq_own_stack+0x2a/0x40 [ 33.891048] [ 33.893284] do_softirq.part.17+0x155/0x1a0 [ 33.897591] ? ip_finish_output2+0xa87/0x1860 [ 33.902081] __local_bh_enable_ip+0x1ec/0x230 [ 33.906559] ip_finish_output2+0xaba/0x1860 [ 33.910865] ? ip_copy_metadata+0xb30/0xb30 [ 33.915171] ? graph_lock+0x170/0x170 [ 33.918962] ? nf_ct_deliver_cached_events+0x558/0x7d0 [ 33.924229] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.929747] ? ipv4_mtu+0x37d/0x590 [ 33.933361] ? __lock_is_held+0xb5/0x140 [ 33.937414] ip_finish_output+0x841/0xfa0 [ 33.941542] ? ip_finish_output+0x841/0xfa0 [ 33.945853] ? ip_fragment.constprop.49+0x240/0x240 [ 33.950860] ? kasan_check_read+0x11/0x20 [ 33.955027] ? rcu_is_watching+0x8c/0x150 [ 33.959195] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 33.963586] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.968585] ? nf_hook_slow+0x11e/0x1c0 [ 33.972555] ip_output+0x223/0x880 [ 33.976074] ? __ip_local_out+0x5e3/0xb50 [ 33.980204] ? ip_mc_output+0x15d0/0x15d0 [ 33.984343] ? ip_fragment.constprop.49+0x240/0x240 [ 33.989352] ? __lock_is_held+0xb5/0x140 [ 33.993435] ip_local_out+0xc5/0x1b0 [ 33.997137] ip_queue_xmit+0x9df/0x1f80 [ 34.001096] ? ip_build_and_send_pkt+0xc80/0xc80 [ 34.005830] ? skb_send_sock+0x50/0x50 [ 34.009697] ? reqsk_fastopen_remove+0x651/0x680 [ 34.014433] ? dccp_insert_option_padding+0xbc/0xe0 [ 34.019437] ? dccp_v4_send_check+0x1a6/0x3d0 [ 34.023988] dccp_transmit_skb+0x999/0x12e0 [ 34.028317] dccp_xmit_packet+0x25e/0x7b0 [ 34.032447] ? dccp_send_sync+0x270/0x270 [ 34.036577] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.041574] ? ccid3_hc_tx_send_packet+0x35a/0x880 [ 34.046488] dccp_write_xmit+0x190/0x1f0 [ 34.050531] dccp_sendmsg+0x8db/0x1030 [ 34.054404] ? dccp_getsockopt+0xf0/0xf0 [ 34.058490] ? rw_copy_check_uvector+0x30d/0x3e0 [ 34.063238] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.068756] ? import_iovec+0x269/0x470 [ 34.072714] ? dup_iter+0x270/0x270 [ 34.076332] inet_sendmsg+0x1a1/0x690 [ 34.080178] ? copy_msghdr_from_user+0x3c4/0x580 [ 34.084948] ? ipip_gro_receive+0x100/0x100 [ 34.089266] ? move_addr_to_kernel.part.20+0x100/0x100 [ 34.094570] ? security_socket_sendmsg+0x94/0xc0 [ 34.099314] ? ipip_gro_receive+0x100/0x100 [ 34.103622] sock_sendmsg+0xd5/0x120 [ 34.107320] ___sys_sendmsg+0x7fd/0x930 [ 34.111291] ? copy_msghdr_from_user+0x580/0x580 [ 34.116106] ? kasan_check_read+0x11/0x20 [ 34.120249] ? __local_bh_enable_ip+0x161/0x230 [ 34.124903] ? __fget_light+0x2f7/0x440 [ 34.128860] ? trace_hardirqs_on+0xd/0x10 [ 34.132994] ? fget_raw+0x20/0x20 [ 34.136459] ? release_sock+0x1ec/0x2c0 [ 34.140415] ? __release_sock+0x3a0/0x3a0 [ 34.144543] ? __local_bh_enable_ip+0x161/0x230 [ 34.149199] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.154716] ? sockfd_lookup_light+0xc5/0x160 [ 34.159193] __sys_sendmsg+0x11d/0x290 [ 34.163063] ? __ia32_sys_shutdown+0x80/0x80 [ 34.167459] ? __x64_sys_futex+0x47f/0x6a0 [ 34.171674] ? __sys_listen+0x23e/0x380 [ 34.175635] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.180123] __x64_sys_sendmsg+0x78/0xb0 [ 34.184168] do_syscall_64+0x1b9/0x820 [ 34.188036] ? finish_task_switch+0x1d3/0x870 [ 34.192515] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.197436] ? syscall_return_slowpath+0x31d/0x5e0 [ 34.202361] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 34.207714] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.212548] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.217720] RIP: 0033:0x446a49 [ 34.220892] 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 [ 34.240066] RSP: 002b:00007f1cd0335da8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 34.247756] RAX: ffffffffffffffda RBX: 00000000006dec58 RCX: 0000000000446a49 [ 34.255011] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000005 [ 34.262260] RBP: 00000000006dec50 R08: 0000000000000000 R09: 0000000000000000 [ 34.269509] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dec5c [ 34.276758] R13: 00000000004b01c0 R14: 0000000020001f80 R15: 0000000000000001 [