[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.244936] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.105192] random: sshd: uninitialized urandom read (32 bytes read) [ 24.472451] random: sshd: uninitialized urandom read (32 bytes read) [ 24.988631] random: sshd: uninitialized urandom read (32 bytes read) [ 25.159999] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.202' (ECDSA) to the list of known hosts. [ 30.703712] random: sshd: uninitialized urandom read (32 bytes read) net.ipv6.conf.syz_tun.accept_dad = 0 [ 30.800558] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 31.003206] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.009654] bridge0: port 1(bridge_slave_0) entered disabled state [ 31.017226] device bridge_slave_0 entered promiscuous mode [ 31.033695] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.040104] bridge0: port 2(bridge_slave_1) entered disabled state [ 31.047950] device bridge_slave_1 entered promiscuous mode [ 31.064266] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 31.080845] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 31.123354] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 31.141756] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 31.207628] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 31.215121] team0: Port device team_slave_0 added [ 31.229727] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 31.237733] team0: Port device team_slave_1 added [ 31.252970] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 31.271596] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 31.289574] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 31.306972] 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 [ 31.427746] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.434216] bridge0: port 2(bridge_slave_1) entered forwarding state [ 31.441227] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.447655] 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 [ 31.874348] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 31.880459] 8021q: adding VLAN 0 to HW filter on device bond0 [ 31.923558] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.967574] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.976357] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 32.016453] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 32.254165] 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() [ 32.267514] CPU: 0 PID: 4691 Comm: syz-executor109 Not tainted 4.18.0-rc8+ #181 [ 32.274985] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.284328] Call Trace: [ 32.286895] [ 32.289046] dump_stack+0x1c9/0x2b4 [ 32.292678] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.297888] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.303410] ? tfrc_rx_handle_loss+0x67c/0x1eb0 [ 32.308064] ? rcu_is_watching+0x8c/0x150 [ 32.312201] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 32.317376] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 32.322122] ? dccp_parse_options+0x493/0x11f0 [ 32.326706] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 32.331621] dccp_deliver_input_to_ccids+0xf0/0x280 [ 32.336624] dccp_rcv_established+0x87/0xb0 [ 32.340931] dccp_v4_do_rcv+0x153/0x180 [ 32.344893] __sk_receive_skb+0x3c0/0xd90 [ 32.349040] ? __inet_lookup_established+0x462/0x690 [ 32.354153] ? sk_free+0x50/0x50 [ 32.357506] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 32.361988] ? reqsk_fastopen_remove+0x680/0x680 [ 32.366734] ? lock_downgrade+0x8f0/0x8f0 [ 32.370867] ? dccp_invalid_packet+0x64/0x890 [ 32.375366] dccp_v4_rcv+0x10f9/0x1f58 [ 32.379242] ? dccp_v4_err+0x1860/0x1860 [ 32.383314] ? __lock_is_held+0xb5/0x140 [ 32.387366] ip_local_deliver_finish+0x2eb/0xda0 [ 32.392109] ? inet_add_protocol.cold.0+0x21/0x21 [ 32.396936] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.401936] ? nf_hook_slow+0x11e/0x1c0 [ 32.405898] ip_local_deliver+0x1e9/0x750 [ 32.410046] ? nf_conntrack_update+0xc80/0xc80 [ 32.414615] ? ip_call_ra_chain+0x730/0x730 [ 32.418925] ? inet_add_protocol.cold.0+0x21/0x21 [ 32.423769] ? graph_lock+0x170/0x170 [ 32.427560] ip_rcv_finish+0x823/0x2220 [ 32.431522] ? ip_local_deliver_finish+0xda0/0xda0 [ 32.436438] ? lock_downgrade+0x8f0/0x8f0 [ 32.440572] ? kasan_check_read+0x11/0x20 [ 32.444703] ? rcu_is_watching+0x8c/0x150 [ 32.448832] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 32.453224] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.458225] ? nf_hook_slow+0x11e/0x1c0 [ 32.462186] ip_rcv+0xa18/0x1284 [ 32.465537] ? ip_local_deliver+0x750/0x750 [ 32.469844] ? ip_local_deliver_finish+0xda0/0xda0 [ 32.474760] ? __lock_is_held+0xb5/0x140 [ 32.478808] ? ip_local_deliver+0x750/0x750 [ 32.483117] __netif_receive_skb_core+0x23d0/0x35b0 [ 32.488123] ? nf_ingress+0xa30/0xa30 [ 32.491909] ? __lock_acquire+0x7fc/0x5020 [ 32.496129] ? kasan_check_read+0x11/0x20 [ 32.500259] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.504655] ? trace_hardirqs_on+0x10/0x10 [ 32.508871] ? trace_hardirqs_off+0xd/0x10 [ 32.513098] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.518186] ? try_to_wake_up+0x10a/0x12a0 [ 32.522410] ? find_held_lock+0x36/0x1c0 [ 32.526465] ? kasan_check_read+0x11/0x20 [ 32.530604] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.534999] ? graph_lock+0x170/0x170 [ 32.538795] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 32.543888] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 32.548891] ? trace_hardirqs_on+0xd/0x10 [ 32.553036] ? find_held_lock+0x36/0x1c0 [ 32.557096] ? print_usage_bug+0xc0/0xc0 [ 32.561144] ? lock_acquire+0x1e4/0x540 [ 32.565103] ? process_backlog+0x1a6/0x760 [ 32.569324] ? kasan_check_read+0x11/0x20 [ 32.573455] ? rcu_is_watching+0x8c/0x150 [ 32.577590] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 32.581989] __netif_receive_skb+0x2c/0x1e0 [ 32.586301] process_backlog+0x219/0x760 [ 32.590368] net_rx_action+0x7da/0x1980 [ 32.594332] ? napi_complete_done+0x6c0/0x6c0 [ 32.598819] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.603840] ? rcu_process_callbacks+0x1251/0x1850 [ 32.608778] ? call_rcu_sched+0x20/0x20 [ 32.612740] ? load_balance+0x3640/0x3640 [ 32.616874] ? enqueue_hrtimer+0x18e/0x540 [ 32.621094] ? rcu_is_watching+0x8c/0x150 [ 32.625231] ? find_held_lock+0x36/0x1c0 [ 32.629285] ? run_rebalance_domains+0x365/0x4c0 [ 32.634036] ? kasan_check_read+0x11/0x20 [ 32.638176] ? rcu_is_watching+0x8c/0x150 [ 32.642307] ? rcu_pm_notify+0xc0/0xc0 [ 32.646187] ? print_usage_bug+0xc0/0xc0 [ 32.650248] ? __do_softirq+0x780/0xb17 [ 32.654205] ? graph_lock+0x170/0x170 [ 32.658169] ? __irqentry_text_end+0x1f97a8/0x1f97a8 [ 32.663259] ? __lock_is_held+0xb5/0x140 [ 32.667329] __do_softirq+0x2e8/0xb17 [ 32.671118] ? __irqentry_text_end+0x1f97a8/0x1f97a8 [ 32.676230] ? irq_exit+0xbb/0x210 [ 32.679756] ? smp_apic_timer_interrupt+0x186/0x730 [ 32.684757] ? smp_call_function_single_interrupt+0x660/0x660 [ 32.690629] ? _raw_spin_unlock+0x22/0x30 [ 32.694762] ? handle_edge_irq+0x330/0x870 [ 32.698985] ? task_prio+0x50/0x50 [ 32.702519] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.707349] do_softirq_own_stack+0x2a/0x40 [ 32.711648] [ 32.713869] do_softirq.part.17+0x155/0x1a0 [ 32.718176] ? ip_finish_output2+0xa87/0x1860 [ 32.722655] __local_bh_enable_ip+0x1ec/0x230 [ 32.727156] ip_finish_output2+0xaba/0x1860 [ 32.731474] ? ip_copy_metadata+0xb30/0xb30 [ 32.735785] ? graph_lock+0x170/0x170 [ 32.739573] ? nf_ct_deliver_cached_events+0x558/0x7d0 [ 32.744848] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.750368] ? ipv4_mtu+0x37d/0x590 [ 32.753997] ? __lock_is_held+0xb5/0x140 [ 32.758075] ip_finish_output+0x841/0xfa0 [ 32.762212] ? ip_finish_output+0x841/0xfa0 [ 32.766520] ? ip_fragment.constprop.49+0x240/0x240 [ 32.771536] ? kasan_check_read+0x11/0x20 [ 32.775667] ? rcu_is_watching+0x8c/0x150 [ 32.779795] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 32.784189] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.789188] ? nf_hook_slow+0x11e/0x1c0 [ 32.793148] ip_output+0x223/0x880 [ 32.796673] ? __ip_local_out+0x5e3/0xb50 [ 32.800804] ? ip_mc_output+0x15d0/0x15d0 [ 32.804935] ? ip_fragment.constprop.49+0x240/0x240 [ 32.809938] ? __lock_is_held+0xb5/0x140 [ 32.813998] ip_local_out+0xc5/0x1b0 [ 32.817713] ip_queue_xmit+0x9df/0x1f80 [ 32.821674] ? ip_build_and_send_pkt+0xc80/0xc80 [ 32.826411] ? skb_send_sock+0x50/0x50 [ 32.830282] ? reqsk_fastopen_remove+0x651/0x680 [ 32.835035] ? dccp_insert_option_padding+0xbc/0xe0 [ 32.840064] ? dccp_v4_send_check+0x1a6/0x3d0 [ 32.844553] dccp_transmit_skb+0x999/0x12e0 [ 32.848865] dccp_xmit_packet+0x25e/0x7b0 [ 32.853009] ? dccp_send_sync+0x270/0x270 [ 32.857168] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 32.862168] ? ccid3_hc_tx_send_packet+0x35a/0x880 [ 32.867089] dccp_write_xmit+0x190/0x1f0 [ 32.871152] dccp_sendmsg+0x8db/0x1030 [ 32.875040] ? dccp_getsockopt+0xf0/0xf0 [ 32.879093] ? rw_copy_check_uvector+0x30d/0x3e0 [ 32.883838] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.889358] ? import_iovec+0x269/0x470 [ 32.893318] ? dup_iter+0x270/0x270 [ 32.896932] inet_sendmsg+0x1a1/0x690 [ 32.900753] ? copy_msghdr_from_user+0x3c4/0x580 [ 32.905496] ? ipip_gro_receive+0x100/0x100 [ 32.909803] ? move_addr_to_kernel.part.20+0x100/0x100 [ 32.915066] ? security_socket_sendmsg+0x94/0xc0 [ 32.919808] ? ipip_gro_receive+0x100/0x100 [ 32.924117] sock_sendmsg+0xd5/0x120 [ 32.927819] ___sys_sendmsg+0x7fd/0x930 [ 32.931781] ? copy_msghdr_from_user+0x580/0x580 [ 32.936523] ? kasan_check_read+0x11/0x20 [ 32.940658] ? __local_bh_enable_ip+0x161/0x230 [ 32.945312] ? __fget_light+0x2f7/0x440 [ 32.949270] ? trace_hardirqs_on+0xd/0x10 [ 32.953400] ? fget_raw+0x20/0x20 [ 32.956850] ? release_sock+0x1ec/0x2c0 [ 32.960813] ? __release_sock+0x3a0/0x3a0 [ 32.964946] ? __local_bh_enable_ip+0x161/0x230 [ 32.969715] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.975236] ? sockfd_lookup_light+0xc5/0x160 [ 32.979719] __sys_sendmsg+0x11d/0x290 [ 32.983617] ? __ia32_sys_shutdown+0x80/0x80 [ 32.988024] ? __x64_sys_futex+0x47f/0x6a0 [ 32.992270] ? __sys_listen+0x23e/0x380 [ 32.996268] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.000764] __x64_sys_sendmsg+0x78/0xb0 [ 33.004812] do_syscall_64+0x1b9/0x820 [ 33.008686] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.013599] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.018517] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.023889] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.028719] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.033896] RIP: 0033:0x446eb9 [ 33.037084] 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 33.056257] RSP: 002b:00007f2861274da8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 33.063948] RAX: ffffffffffffffda RBX: 00000000006dec58 RCX: 0000000000446eb9 [ 33.071203] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000005 [ 33.078457] RBP: 00000000006dec50 R08: 0000000000000000 R09: 0000000000000000 [ 33.085709] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dec5c [ 33.092989] R13: 00000000004b05d0 R14: 0000000020001f80 R15: 0000000000000001