[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.973315] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 25.322236] random: sshd: uninitialized urandom read (32 bytes read) [ 25.718843] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.349335] random: sshd: uninitialized urandom read (32 bytes read) [ 26.557001] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 32.103616] random: sshd: uninitialized urandom read (32 bytes read) [ 32.227492] IPVS: ftp: loaded support on port[0] = 21 [ 32.385308] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.391905] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.399270] device bridge_slave_0 entered promiscuous mode [ 32.416928] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.423309] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.430490] device bridge_slave_1 entered promiscuous mode [ 32.447950] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.464840] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.512902] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 32.532178] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 32.605141] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 32.612480] team0: Port device team_slave_0 added [ 32.629165] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 32.636381] team0: Port device team_slave_1 added [ 32.652414] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 32.673950] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 32.692900] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.711125] 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 [ 32.845303] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.851725] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.858642] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.865013] 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 [ 33.345248] 8021q: adding VLAN 0 to HW filter on device bond0 [ 33.393127] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.441828] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 33.448163] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 33.455600] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.501017] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 33.770214] 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() [ 33.783533] CPU: 1 PID: 5578 Comm: syz-executor301 Not tainted 4.19.0-rc5+ #252 [ 33.790967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.800566] Call Trace: [ 33.803129] [ 33.805265] dump_stack+0x1c4/0x2b4 [ 33.808878] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.814052] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.819574] ? tfrc_rx_handle_loss+0x67b/0x1eb0 [ 33.824247] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 33.829425] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 33.834175] ? dccp_parse_options+0x4a1/0x12f0 [ 33.838745] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 33.843662] dccp_deliver_input_to_ccids+0xf0/0x280 [ 33.848665] dccp_rcv_established+0x87/0xb0 [ 33.852995] dccp_v4_do_rcv+0x153/0x180 [ 33.856962] __sk_receive_skb+0x3e5/0xec0 [ 33.861108] ? sk_free+0x50/0x50 [ 33.864491] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 33.868974] ? reqsk_fastopen_remove+0x660/0x660 [ 33.873718] ? lock_downgrade+0x900/0x900 [ 33.877849] ? check_preemption_disabled+0x48/0x200 [ 33.882864] ? dccp_invalid_packet+0x64/0x880 [ 33.887346] dccp_v4_rcv+0x10f9/0x1f58 [ 33.891224] ? dccp_v4_err+0x18a0/0x18a0 [ 33.895275] ? __lock_is_held+0xb5/0x140 [ 33.899331] ip_local_deliver_finish+0x2e9/0xda0 [ 33.904075] ? ip_sublist_rcv_finish+0x3f0/0x3f0 [ 33.908816] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.913819] ? nf_hook_slow+0x11e/0x1c0 [ 33.917783] ip_local_deliver+0x1e9/0x750 [ 33.921927] ? ip_call_ra_chain+0x730/0x730 [ 33.926240] ? ip_sublist_rcv_finish+0x3f0/0x3f0 [ 33.930989] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 33.936769] ? kasan_check_read+0x11/0x20 [ 33.940900] ? rcu_bh_qs+0xc0/0xc0 [ 33.944427] ip_rcv_finish+0x1f9/0x300 [ 33.948310] ip_rcv+0xed/0x610 [ 33.951511] ? enqueue_entity+0x34b/0x1ff0 [ 33.955729] ? ip_local_deliver+0x750/0x750 [ 33.960052] ? ip_rcv_finish_core.isra.15+0x1f40/0x1f40 [ 33.965404] ? lock_acquire+0x1ed/0x520 [ 33.969362] ? process_backlog+0x1a6/0x760 [ 33.973580] __netif_receive_skb_one_core+0x14d/0x200 [ 33.978751] ? __netif_receive_skb_core+0x3b60/0x3b60 [ 33.983926] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 33.989185] ? rcu_bh_qs+0xc0/0xc0 [ 33.992707] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 33.998140] __netif_receive_skb+0x2c/0x1e0 [ 34.002458] process_backlog+0x217/0x760 [ 34.006511] net_rx_action+0x7c5/0x1950 [ 34.010483] ? napi_complete_done+0x6d0/0x6d0 [ 34.014972] ? try_to_wake_up+0x10a/0x12f0 [ 34.019192] ? trace_hardirqs_off+0xb8/0x310 [ 34.023582] ? kasan_check_read+0x11/0x20 [ 34.027712] ? do_raw_spin_unlock+0xa7/0x2f0 [ 34.032104] ? trace_hardirqs_on+0x310/0x310 [ 34.036498] ? rcu_read_lock+0x70/0x70 [ 34.040372] ? try_to_wake_up+0x10a/0x12f0 [ 34.044592] ? migrate_swap_stop+0x930/0x930 [ 34.049012] ? find_held_lock+0x36/0x1c0 [ 34.053062] ? pvclock_read_flags+0x160/0x160 [ 34.057541] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.063063] ? check_preemption_disabled+0x48/0x200 [ 34.068081] ? print_usage_bug+0xc0/0xc0 [ 34.072128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.077647] ? check_preemption_disabled+0x48/0x200 [ 34.082651] ? __local_bh_enable+0xef/0x130 [ 34.086962] ? graph_lock+0x170/0x170 [ 34.090771] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.096306] ? check_preemption_disabled+0x48/0x200 [ 34.101316] ? check_preemption_disabled+0x48/0x200 [ 34.106320] ? __lock_is_held+0xb5/0x140 [ 34.110370] __do_softirq+0x30b/0xad8 [ 34.114173] ? __irqentry_text_end+0x1f9618/0x1f9618 [ 34.119262] ? smp_reschedule_interrupt+0x109/0x650 [ 34.124260] ? smp_thermal_interrupt+0x850/0x850 [ 34.128998] ? ret_from_intr+0xb/0x1e [ 34.132779] ? trace_hardirqs_off_caller+0xbb/0x310 [ 34.137779] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.142607] ? trace_hardirqs_on_caller+0x310/0x310 [ 34.147605] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.153122] ? check_preemption_disabled+0x48/0x200 [ 34.158128] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.162952] ? ip_finish_output2+0xa83/0x18d0 [ 34.167434] do_softirq_own_stack+0x2a/0x40 [ 34.171740] [ 34.173969] do_softirq.part.13+0x126/0x160 [ 34.178273] __local_bh_enable_ip+0x21d/0x260 [ 34.182752] ip_finish_output2+0xab6/0x18d0 [ 34.187063] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 34.192848] ? ip_copy_metadata+0xe10/0xe10 [ 34.197153] ? graph_lock+0x170/0x170 [ 34.200938] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.206469] ? check_preemption_disabled+0x48/0x200 [ 34.211474] ? check_preemption_disabled+0x48/0x200 [ 34.216475] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.221993] ? ipv4_mtu+0x37d/0x590 [ 34.225607] ? __lock_is_held+0xb5/0x140 [ 34.229654] ip_finish_output+0x7fd/0xf60 [ 34.233792] ? ip_finish_output+0x7fd/0xf60 [ 34.238100] ? ip_fragment.constprop.49+0x240/0x240 [ 34.243094] ? kasan_check_read+0x11/0x20 [ 34.247224] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 34.252485] ? rcu_bh_qs+0xc0/0xc0 [ 34.256022] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.261036] ? nf_hook_slow+0x11e/0x1c0 [ 34.264997] ip_output+0x21d/0x8d0 [ 34.268520] ? ip_mc_output+0x15b0/0x15b0 [ 34.272655] ? ip_fragment.constprop.49+0x240/0x240 [ 34.277652] ? __lock_is_held+0xb5/0x140 [ 34.281701] ip_local_out+0xc5/0x1b0 [ 34.285398] __ip_queue_xmit+0x9af/0x1f30 [ 34.289531] ? ip_build_and_send_pkt+0xc80/0xc80 [ 34.294270] ? __skb_checksum+0x920/0x920 [ 34.298416] ? skb_send_sock+0x50/0x50 [ 34.302294] ? reqsk_fastopen_remove+0x660/0x660 [ 34.307035] ? dccp_insert_option_padding+0xbc/0xe0 [ 34.312037] ip_queue_xmit+0x56/0x70 [ 34.315736] dccp_transmit_skb+0x98c/0x12e0 [ 34.320046] dccp_xmit_packet+0x25e/0x8a0 [ 34.324175] ? kasan_check_write+0x14/0x20 [ 34.328390] ? do_raw_spin_lock+0xc1/0x200 [ 34.332620] ? dccp_send_sync+0x270/0x270 [ 34.336751] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.341748] ? ccid3_hc_tx_send_packet+0x358/0x880 [ 34.346690] dccp_write_xmit+0x190/0x1f0 [ 34.350737] dccp_sendmsg+0xdc8/0x1020 [ 34.354616] ? dccp_getsockopt+0xf0/0xf0 [ 34.358664] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 34.363576] ? aa_sk_perm+0x218/0x8b0 [ 34.367359] ? import_iovec+0x269/0x470 [ 34.371314] ? aa_af_perm+0x5a0/0x5a0 [ 34.375102] inet_sendmsg+0x1a1/0x690 [ 34.378885] ? ipip_gro_receive+0x100/0x100 [ 34.383190] ? apparmor_socket_sendmsg+0x29/0x30 [ 34.387930] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.393453] ? security_socket_sendmsg+0x94/0xc0 [ 34.398195] ? ipip_gro_receive+0x100/0x100 [ 34.402500] sock_sendmsg+0xd5/0x120 [ 34.406198] ___sys_sendmsg+0x7fd/0x930 [ 34.410171] ? copy_msghdr_from_user+0x580/0x580 [ 34.414910] ? _raw_spin_unlock_bh+0x30/0x40 [ 34.419302] ? check_preemption_disabled+0x48/0x200 [ 34.424308] ? __fget_light+0x2e9/0x430 [ 34.428265] ? fget_raw+0x20/0x20 [ 34.431700] ? release_sock+0x1ec/0x2c0 [ 34.435654] ? lock_sock_nested+0x9a/0x120 [ 34.439868] ? __release_sock+0x3a0/0x3a0 [ 34.444015] ? __local_bh_enable_ip+0x160/0x260 [ 34.448672] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.454191] ? sockfd_lookup_light+0xc5/0x160 [ 34.458669] __sys_sendmsg+0x11d/0x280 [ 34.462537] ? __ia32_sys_shutdown+0x80/0x80 [ 34.466935] ? __x64_sys_futex+0x47f/0x6a0 [ 34.471157] ? do_syscall_64+0x9a/0x820 [ 34.475113] ? do_syscall_64+0x9a/0x820 [ 34.479072] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 34.484504] ? trace_hardirqs_off+0xb8/0x310 [ 34.488895] __x64_sys_sendmsg+0x78/0xb0 [ 34.492936] do_syscall_64+0x1b9/0x820 [ 34.496809] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.502155] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.507068] ? trace_hardirqs_on_caller+0x310/0x310 [ 34.512067] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 34.517066] ? recalc_sigpending_tsk+0x180/0x180 [ 34.521804] ? kasan_check_write+0x14/0x20 [ 34.526027] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.530855] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.536025] RIP: 0033:0x446aa9 [ 34.539204] 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 [ 34.558086] RSP: 002b:00007fe3c679eda8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 34.565775] RAX: ffffffffffffffda RBX: 00000000006dec68 RCX: 0000000000446aa9 [ 34.573026] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000005 [ 34.580275] RBP: 00000000006dec60 R08: 0000000000000000 R09: 0000000000000000 [ 34.587525] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dec6c [ 34.594776] R13: 0000000020001f80 R14: 00676e697279656b R15: 0000000000000005