[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 27.704079] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.231298] random: sshd: uninitialized urandom read (32 bytes read) [ 32.689176] random: sshd: uninitialized urandom read (32 bytes read) [ 33.284945] random: sshd: uninitialized urandom read (32 bytes read) [ 33.515647] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.113' (ECDSA) to the list of known hosts. [ 39.235692] random: sshd: uninitialized urandom read (32 bytes read) [ 39.367261] IPVS: ftp: loaded support on port[0] = 21 [ 39.537028] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.543764] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.551017] device bridge_slave_0 entered promiscuous mode [ 39.569617] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.575994] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.583313] device bridge_slave_1 entered promiscuous mode [ 39.601589] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 39.619182] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 39.669679] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.689381] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.765108] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 39.772630] team0: Port device team_slave_0 added [ 39.789781] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 39.797129] team0: Port device team_slave_1 added [ 39.814107] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 39.833460] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 39.852929] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 39.874587] 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 [ 40.020146] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.026857] bridge0: port 2(bridge_slave_1) entered forwarding state [ 40.033639] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.040492] 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 [ 40.557370] 8021q: adding VLAN 0 to HW filter on device bond0 [ 40.610124] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 40.663313] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 40.669735] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 40.677568] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 40.733792] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 41.024125] 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() [ 41.037658] CPU: 0 PID: 5640 Comm: syz-executor626 Not tainted 4.19.0-rc5+ #29 [ 41.045023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.054371] Call Trace: [ 41.056947] [ 41.059154] dump_stack+0x1c4/0x2b4 [ 41.062802] ? dump_stack_print_info.cold.2+0x52/0x52 [ 41.067994] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.073528] ? tfrc_rx_handle_loss+0x67b/0x1eb0 [ 41.078296] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 41.083553] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 41.088406] ? dccp_parse_options+0x4a1/0x12f0 [ 41.093010] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 41.097941] dccp_deliver_input_to_ccids+0xf0/0x280 [ 41.102978] dccp_rcv_established+0x87/0xb0 [ 41.107299] dccp_v4_do_rcv+0x153/0x180 [ 41.111340] __sk_receive_skb+0x3e5/0xec0 [ 41.115498] ? sk_free+0x50/0x50 [ 41.118870] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 41.123371] ? reqsk_fastopen_remove+0x660/0x660 [ 41.128225] ? lock_downgrade+0x900/0x900 [ 41.132374] ? check_preemption_disabled+0x48/0x200 [ 41.137395] ? dccp_invalid_packet+0x64/0x880 [ 41.142034] dccp_v4_rcv+0x10f9/0x1f58 [ 41.145936] ? dccp_v4_err+0x18a0/0x18a0 [ 41.149998] ? __lock_is_held+0xb5/0x140 [ 41.154077] ip_local_deliver_finish+0x2e9/0xda0 [ 41.158857] ? ip_sublist_rcv_finish+0x3f0/0x3f0 [ 41.163640] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 41.168650] ? nf_hook_slow+0x11e/0x1c0 [ 41.172637] ip_local_deliver+0x1e9/0x750 [ 41.176784] ? ip_call_ra_chain+0x730/0x730 [ 41.181222] ? ip_sublist_rcv_finish+0x3f0/0x3f0 [ 41.185987] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 41.191778] ? kasan_check_read+0x11/0x20 [ 41.195952] ? rcu_bh_qs+0xc0/0xc0 [ 41.199494] ip_rcv_finish+0x1f9/0x300 [ 41.203376] ip_rcv+0xed/0x610 [ 41.206558] ? ip_local_deliver+0x750/0x750 [ 41.211014] ? ip_rcv_finish_core.isra.15+0x1f40/0x1f40 [ 41.216579] ? lock_acquire+0x1ed/0x520 [ 41.220564] ? process_backlog+0x1a6/0x760 [ 41.224808] __netif_receive_skb_one_core+0x14d/0x200 [ 41.230014] ? __netif_receive_skb_core+0x3b60/0x3b60 [ 41.235214] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.240502] ? rcu_bh_qs+0xc0/0xc0 [ 41.244042] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 41.249490] __netif_receive_skb+0x2c/0x1e0 [ 41.253801] process_backlog+0x217/0x760 [ 41.257868] net_rx_action+0x7c5/0x1950 [ 41.261841] ? napi_complete_done+0x6d0/0x6d0 [ 41.266328] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.271617] ? rcu_bh_qs+0xc0/0xc0 [ 41.275157] ? rebalance_domains+0x375/0xdc0 [ 41.279586] ? load_balance+0x3430/0x3430 [ 41.283721] ? print_usage_bug+0xc0/0xc0 [ 41.287791] ? lock_release+0x970/0x970 [ 41.291756] ? find_held_lock+0x36/0x1c0 [ 41.295807] ? pvclock_read_flags+0x160/0x160 [ 41.300293] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.305820] ? check_preemption_disabled+0x48/0x200 [ 41.310824] ? check_preemption_disabled+0x48/0x200 [ 41.315839] ? print_usage_bug+0xc0/0xc0 [ 41.319892] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.325446] ? check_preemption_disabled+0x48/0x200 [ 41.330464] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.336025] ? __local_bh_enable+0xef/0x130 [ 41.340343] ? graph_lock+0x170/0x170 [ 41.344172] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.349706] ? check_preemption_disabled+0x48/0x200 [ 41.354713] ? check_preemption_disabled+0x48/0x200 [ 41.359726] ? __lock_is_held+0xb5/0x140 [ 41.363792] __do_softirq+0x30b/0xad8 [ 41.367593] ? __irqentry_text_end+0x1f9618/0x1f9618 [ 41.372692] ? smp_reschedule_interrupt+0x109/0x650 [ 41.377705] ? smp_thermal_interrupt+0x850/0x850 [ 41.382450] ? ret_from_intr+0xb/0x1e [ 41.386243] ? trace_hardirqs_off_caller+0xbb/0x310 [ 41.391255] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.396094] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.401108] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.406645] ? check_preemption_disabled+0x48/0x200 [ 41.411663] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.417202] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.422054] ? ip_finish_output2+0xa83/0x18d0 [ 41.426562] do_softirq_own_stack+0x2a/0x40 [ 41.430880] [ 41.433115] do_softirq.part.13+0x126/0x160 [ 41.437430] __local_bh_enable_ip+0x21d/0x260 [ 41.441921] ip_finish_output2+0xab6/0x18d0 [ 41.446245] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 41.452156] ? ip_copy_metadata+0xe10/0xe10 [ 41.456488] ? graph_lock+0x170/0x170 [ 41.460299] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.465843] ? check_preemption_disabled+0x48/0x200 [ 41.470845] ? check_preemption_disabled+0x48/0x200 [ 41.475848] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.481375] ? ipv4_mtu+0x37d/0x590 [ 41.485003] ? __lock_is_held+0xb5/0x140 [ 41.489063] ip_finish_output+0x7fd/0xf60 [ 41.493201] ? ip_finish_output+0x7fd/0xf60 [ 41.497540] ? ip_fragment.constprop.49+0x240/0x240 [ 41.502542] ? kasan_check_read+0x11/0x20 [ 41.506683] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.511949] ? rcu_bh_qs+0xc0/0xc0 [ 41.515484] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 41.520490] ? nf_hook_slow+0x11e/0x1c0 [ 41.524454] ip_output+0x21d/0x8d0 [ 41.527997] ? ip_mc_output+0x15b0/0x15b0 [ 41.532146] ? ip_fragment.constprop.49+0x240/0x240 [ 41.537166] ? __lock_is_held+0xb5/0x140 [ 41.541224] ip_local_out+0xc5/0x1b0 [ 41.544937] __ip_queue_xmit+0x9af/0x1f30 [ 41.549094] ? ip_build_and_send_pkt+0xc80/0xc80 [ 41.553846] ? __skb_checksum+0x920/0x920 [ 41.557985] ? skb_send_sock+0x50/0x50 [ 41.561872] ? reqsk_fastopen_remove+0x660/0x660 [ 41.566633] ? dccp_insert_option_padding+0xbc/0xe0 [ 41.571644] ip_queue_xmit+0x56/0x70 [ 41.575349] dccp_transmit_skb+0x98c/0x12e0 [ 41.579663] dccp_xmit_packet+0x25e/0x8a0 [ 41.583798] ? kasan_check_write+0x14/0x20 [ 41.588026] ? do_raw_spin_lock+0xc1/0x200 [ 41.592256] ? dccp_send_sync+0x270/0x270 [ 41.596403] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 41.601408] ? ccid3_hc_tx_send_packet+0x358/0x880 [ 41.606338] dccp_write_xmit+0x190/0x1f0 [ 41.610418] dccp_sendmsg+0xdc8/0x1020 [ 41.614300] ? dccp_getsockopt+0xf0/0xf0 [ 41.618354] ? rw_copy_check_uvector+0x310/0x3e0 [ 41.623134] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.628671] ? smack_ipv6host_label+0x2b3/0x500 [ 41.633336] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.638868] ? smack_socket_getpeersec_stream+0x1d0/0x1d0 [ 41.644416] inet_sendmsg+0x1a1/0x690 [ 41.648210] ? ipip_gro_receive+0x100/0x100 [ 41.652527] ? smack_socket_sendmsg+0xb0/0x190 [ 41.657108] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.662635] ? security_socket_sendmsg+0x94/0xc0 [ 41.667478] ? ipip_gro_receive+0x100/0x100 [ 41.671792] sock_sendmsg+0xd5/0x120 [ 41.675511] ___sys_sendmsg+0x7fd/0x930 [ 41.679579] ? copy_msghdr_from_user+0x580/0x580 [ 41.684395] ? _raw_spin_unlock_bh+0x30/0x40 [ 41.688819] ? check_preemption_disabled+0x48/0x200 [ 41.693829] ? __fget_light+0x2e9/0x430 [ 41.697888] ? fget_raw+0x20/0x20 [ 41.701344] ? release_sock+0x1ec/0x2c0 [ 41.705310] ? lock_sock_nested+0x9a/0x120 [ 41.709535] ? __release_sock+0x3a0/0x3a0 [ 41.713691] ? __local_bh_enable_ip+0x160/0x260 [ 41.718404] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.724086] ? sockfd_lookup_light+0xc5/0x160 [ 41.728589] __sys_sendmsg+0x11d/0x280 [ 41.732478] ? __ia32_sys_shutdown+0x80/0x80 [ 41.736905] ? __x64_sys_futex+0x47f/0x6a0 [ 41.741130] ? do_syscall_64+0x9a/0x820 [ 41.745092] ? do_syscall_64+0x9a/0x820 [ 41.749065] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 41.754504] ? trace_hardirqs_off+0xb8/0x310 [ 41.758911] __x64_sys_sendmsg+0x78/0xb0 [ 41.762984] do_syscall_64+0x1b9/0x820 [ 41.766876] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 41.772268] ? syscall_return_slowpath+0x5e0/0x5e0 [ 41.777192] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.782200] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 41.787208] ? recalc_sigpending_tsk+0x180/0x180 [ 41.791969] ? kasan_check_write+0x14/0x20 [ 41.796198] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.801036] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.806211] RIP: 0033:0x446a49 [ 41.809587] 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 [ 41.828555] RSP: 002b:00007f3630651da8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 41.836285] RAX: ffffffffffffffda RBX: 00000000006dec58 RCX: 0000000000446a49 [ 41.843576] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000005 [ 41.850841] RBP: 00000000006dec50 R08: 0000000000000000 R09: 0000000000000000 [ 41.858115] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dec5c [ 41.865477] R13: 00000000004b01c8 R14: 0000000020001f80 R15: 0000000000000001