[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 25.363587] sshd (5253) used greatest stack depth: 15496 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 25.613654] kauditd_printk_skb: 7 callbacks suppressed [ 25.613665] audit: type=1800 audit(1538342301.911:29): pid=5183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 25.639244] audit: type=1800 audit(1538342301.911:30): pid=5183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. syzkaller login: [ 35.563514] IPVS: ftp: loaded support on port[0] = 21 [ 35.726635] bridge0: port 1(bridge_slave_0) entered blocking state [ 35.733552] bridge0: port 1(bridge_slave_0) entered disabled state [ 35.740642] device bridge_slave_0 entered promiscuous mode [ 35.759056] bridge0: port 2(bridge_slave_1) entered blocking state [ 35.765541] bridge0: port 2(bridge_slave_1) entered disabled state [ 35.772875] device bridge_slave_1 entered promiscuous mode [ 35.789965] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.807799] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.857680] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 35.878656] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 35.953828] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 35.962018] team0: Port device team_slave_0 added [ 35.979418] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 35.986777] team0: Port device team_slave_1 added [ 36.003765] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 36.024434] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 36.043634] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 36.064477] 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 [ 36.204281] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.210782] bridge0: port 2(bridge_slave_1) entered forwarding state [ 36.217735] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.224121] 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 [ 36.725724] 8021q: adding VLAN 0 to HW filter on device bond0 [ 36.776423] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.826796] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 36.833226] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 36.840379] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 36.901654] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 37.182518] 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() [ 37.195876] CPU: 1 PID: 5580 Comm: syz-executor007 Not tainted 4.19.0-rc5+ #238 [ 37.203317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.212663] Call Trace: [ 37.215406] [ 37.217550] dump_stack+0x1c4/0x2b4 [ 37.221193] ? dump_stack_print_info.cold.2+0x52/0x52 [ 37.226391] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.231917] ? tfrc_rx_handle_loss+0x67b/0x1eb0 [ 37.236588] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 37.241769] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 37.246546] ? dccp_parse_options+0x4a1/0x12f0 [ 37.251125] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 37.256058] dccp_deliver_input_to_ccids+0xf0/0x280 [ 37.261067] dccp_rcv_established+0x87/0xb0 [ 37.265380] dccp_v4_do_rcv+0x153/0x180 [ 37.269364] __sk_receive_skb+0x3e5/0xec0 [ 37.273503] ? sk_free+0x50/0x50 [ 37.276863] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 37.281354] ? reqsk_fastopen_remove+0x660/0x660 [ 37.286112] ? lock_downgrade+0x900/0x900 [ 37.290262] ? check_preemption_disabled+0x48/0x200 [ 37.295270] ? dccp_invalid_packet+0x64/0x880 [ 37.299758] dccp_v4_rcv+0x10f9/0x1f58 [ 37.303653] ? dccp_v4_err+0x18a0/0x18a0 [ 37.307708] ? __lock_is_held+0xb5/0x140 [ 37.311768] ip_local_deliver_finish+0x2e9/0xda0 [ 37.316515] ? ip_sublist_rcv_finish+0x3a0/0x3a0 [ 37.321544] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 37.326570] ? nf_hook_slow+0x11e/0x1c0 [ 37.330552] ip_local_deliver+0x1e9/0x750 [ 37.334698] ? ip_call_ra_chain+0x730/0x730 [ 37.339012] ? ip_sublist_rcv_finish+0x3a0/0x3a0 [ 37.343774] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 37.349562] ? kasan_check_read+0x11/0x20 [ 37.353699] ? rcu_bh_qs+0xc0/0xc0 [ 37.357232] ip_rcv_finish+0x1f9/0x300 [ 37.361106] ip_rcv+0xed/0x610 [ 37.364285] ? ip_local_deliver+0x750/0x750 [ 37.368598] ? ip_rcv_finish_core.isra.16+0x1f40/0x1f40 [ 37.373952] ? lock_acquire+0x1ed/0x520 [ 37.377913] ? process_backlog+0x1a7/0x6f0 [ 37.382138] __netif_receive_skb_one_core+0x14d/0x200 [ 37.387317] ? __netif_receive_skb_core+0x3b30/0x3b30 [ 37.392500] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 37.397798] ? rcu_bh_qs+0xc0/0xc0 [ 37.401358] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 37.406815] __netif_receive_skb+0x2c/0x1e0 [ 37.411126] process_backlog+0x218/0x6f0 [ 37.415188] net_rx_action+0x7c5/0x1950 [ 37.419184] ? napi_complete_done+0x6d0/0x6d0 [ 37.423669] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 37.428952] ? rcu_bh_qs+0xc0/0xc0 [ 37.432486] ? rebalance_domains+0x375/0xdc0 [ 37.436894] ? load_balance+0x3430/0x3430 [ 37.441029] ? print_usage_bug+0xc0/0xc0 [ 37.445077] ? lock_release+0x970/0x970 [ 37.449045] ? find_held_lock+0x36/0x1c0 [ 37.453097] ? pvclock_read_flags+0x160/0x160 [ 37.457588] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.463115] ? check_preemption_disabled+0x48/0x200 [ 37.468121] ? check_preemption_disabled+0x48/0x200 [ 37.473133] ? print_usage_bug+0xc0/0xc0 [ 37.477187] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.482720] ? check_preemption_disabled+0x48/0x200 [ 37.487746] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.493281] ? __local_bh_enable+0xef/0x130 [ 37.497593] ? graph_lock+0x170/0x170 [ 37.501398] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.506927] ? check_preemption_disabled+0x48/0x200 [ 37.511928] ? check_preemption_disabled+0x48/0x200 [ 37.516934] ? __lock_is_held+0xb5/0x140 [ 37.520986] __do_softirq+0x30b/0xad8 [ 37.524780] ? __irqentry_text_end+0x1f9618/0x1f9618 [ 37.529882] ? irq_exit+0xbd/0x1c0 [ 37.533426] ? smp_apic_timer_interrupt+0x1cb/0x760 [ 37.538429] ? smp_reschedule_interrupt+0x109/0x650 [ 37.543435] ? smp_call_function_single_interrupt+0x650/0x650 [ 37.549311] ? ret_from_intr+0xb/0x1e [ 37.553102] ? trace_hardirqs_off_caller+0xbb/0x310 [ 37.558108] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.562937] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.567939] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.573486] ? check_preemption_disabled+0x48/0x200 [ 37.578491] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.583323] ? ip_finish_output2+0xa83/0x1860 [ 37.587811] do_softirq_own_stack+0x2a/0x40 [ 37.592114] [ 37.594343] do_softirq.part.13+0x126/0x160 [ 37.598654] __local_bh_enable_ip+0x21d/0x260 [ 37.603142] ip_finish_output2+0xab6/0x1860 [ 37.607450] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 37.613237] ? ip_copy_metadata+0xe10/0xe10 [ 37.617544] ? graph_lock+0x170/0x170 [ 37.621330] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.626869] ? check_preemption_disabled+0x48/0x200 [ 37.631886] ? check_preemption_disabled+0x48/0x200 [ 37.636891] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.642415] ? ipv4_mtu+0x37d/0x590 [ 37.646031] ? __lock_is_held+0xb5/0x140 [ 37.650082] ip_finish_output+0x7fd/0xf90 [ 37.654218] ? ip_finish_output+0x7fd/0xf90 [ 37.658710] ? ip_fragment.constprop.50+0x240/0x240 [ 37.663714] ? kasan_check_read+0x11/0x20 [ 37.667849] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 37.673240] ? rcu_bh_qs+0xc0/0xc0 [ 37.676766] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 37.681768] ? nf_hook_slow+0x11e/0x1c0 [ 37.685728] ip_output+0x21d/0x8d0 [ 37.689253] ? ip_mc_output+0x15b0/0x15b0 [ 37.693385] ? ip_fragment.constprop.50+0x240/0x240 [ 37.698384] ? __lock_is_held+0xb5/0x140 [ 37.702434] ip_local_out+0xc5/0x1b0 [ 37.706133] __ip_queue_xmit+0x9af/0x1f30 [ 37.710281] ? ip_build_and_send_pkt+0xc80/0xc80 [ 37.715026] ? __skb_checksum+0x920/0x920 [ 37.719156] ? skb_send_sock+0x50/0x50 [ 37.723039] ? reqsk_fastopen_remove+0x660/0x660 [ 37.727794] ? dccp_insert_option_padding+0xbc/0xe0 [ 37.732822] ip_queue_xmit+0x56/0x70 [ 37.736521] dccp_transmit_skb+0x98c/0x12e0 [ 37.740835] dccp_xmit_packet+0x25e/0x7d0 [ 37.744965] ? kasan_check_write+0x14/0x20 [ 37.749183] ? do_raw_spin_lock+0xc1/0x200 [ 37.753403] ? dccp_send_sync+0x270/0x270 [ 37.757537] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 37.762537] ? ccid3_hc_tx_send_packet+0x358/0x880 [ 37.767467] dccp_write_xmit+0x190/0x1f0 [ 37.771517] dccp_sendmsg+0xdc8/0x1020 [ 37.775393] ? dccp_getsockopt+0xf0/0xf0 [ 37.779443] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 37.784358] ? aa_sk_perm+0x218/0x8b0 [ 37.788143] ? import_iovec+0x269/0x470 [ 37.792104] ? aa_af_perm+0x5a0/0x5a0 [ 37.795910] inet_sendmsg+0x1a1/0x690 [ 37.799710] ? ipip_gro_receive+0x100/0x100 [ 37.804021] ? apparmor_socket_sendmsg+0x29/0x30 [ 37.808762] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.814285] ? security_socket_sendmsg+0x94/0xc0 [ 37.819028] ? ipip_gro_receive+0x100/0x100 [ 37.823342] sock_sendmsg+0xd5/0x120 [ 37.827041] ___sys_sendmsg+0x7fd/0x930 [ 37.831003] ? copy_msghdr_from_user+0x580/0x580 [ 37.835747] ? _raw_spin_unlock_bh+0x30/0x40 [ 37.840143] ? check_preemption_disabled+0x48/0x200 [ 37.845144] ? __fget_light+0x2e9/0x430 [ 37.849103] ? fget_raw+0x20/0x20 [ 37.852542] ? release_sock+0x1ec/0x2c0 [ 37.856514] ? lock_sock_nested+0x9a/0x120 [ 37.860732] ? __release_sock+0x3a0/0x3a0 [ 37.864879] ? __local_bh_enable_ip+0x160/0x260 [ 37.869539] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 37.875062] ? sockfd_lookup_light+0xc5/0x160 [ 37.879541] __sys_sendmsg+0x11d/0x280 [ 37.883412] ? __ia32_sys_shutdown+0x80/0x80 [ 37.887810] ? __x64_sys_futex+0x47f/0x6a0 [ 37.892830] ? do_syscall_64+0x9a/0x820 [ 37.896786] ? do_syscall_64+0x9a/0x820 [ 37.900750] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 37.906183] ? trace_hardirqs_off+0xb8/0x310 [ 37.910574] __x64_sys_sendmsg+0x78/0xb0 [ 37.914621] do_syscall_64+0x1b9/0x820 [ 37.918493] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.923844] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.928758] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.933778] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.938782] ? recalc_sigpending_tsk+0x180/0x180 [ 37.943525] ? kasan_check_write+0x14/0x20 [ 37.947746] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.952579] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.957750] RIP: 0033:0x446a49 [ 37.960924] 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 [ 37.979807] RSP: 002b:00007efe9b163da8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 37.987516] RAX: ffffffffffffffda RBX: 00000000006dec68 RCX: 0000000000446a49 [ 37.994781] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000005 [ 38.002031] RBP: 00000000006dec60 R08: 0000000000000000 R09: 0000000000000000 [ 38.009293] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dec6c [ 38.016558] R13: 00000000004b01c8 R14: 0000000020001f80 R15: 0000000000000005