[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.067439] kauditd_printk_skb: 8 callbacks suppressed [ 28.067451] audit: type=1800 audit(1540929340.794:29): pid=5568 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 [ 28.093724] audit: type=1800 audit(1540929340.804:30): pid=5568 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 '10.128.0.75' (ECDSA) to the list of known hosts. syzkaller login: [ 38.715729] IPVS: ftp: loaded support on port[0] = 21 [ 38.881860] bridge0: port 1(bridge_slave_0) entered blocking state [ 38.888609] bridge0: port 1(bridge_slave_0) entered disabled state [ 38.896016] device bridge_slave_0 entered promiscuous mode [ 38.914581] bridge0: port 2(bridge_slave_1) entered blocking state [ 38.921024] bridge0: port 2(bridge_slave_1) entered disabled state [ 38.927983] device bridge_slave_1 entered promiscuous mode [ 38.945395] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 38.963472] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 39.013305] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.033755] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.109797] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 39.117257] team0: Port device team_slave_0 added [ 39.135731] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 39.143008] team0: Port device team_slave_1 added [ 39.159316] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 39.178366] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 39.197014] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 39.217029] 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 [ 39.361547] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.367969] bridge0: port 2(bridge_slave_1) entered forwarding state [ 39.374919] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.381282] 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 [ 39.897431] 8021q: adding VLAN 0 to HW filter on device bond0 [ 39.948859] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 40.001661] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 40.007796] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 40.015516] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 40.063573] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 40.390860] 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() [ 40.404202] CPU: 1 PID: 5965 Comm: syz-executor968 Not tainted 4.19.0+ #162 [ 40.411290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.420626] Call Trace: [ 40.423193] [ 40.425334] dump_stack+0x244/0x39d [ 40.428947] ? dump_stack_print_info.cold.1+0x20/0x20 [ 40.434127] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.439656] ? tfrc_rx_handle_loss+0x67b/0x1eb0 [ 40.444318] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 40.449499] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 40.454241] ? dccp_parse_options+0x4a1/0x12f0 [ 40.458810] ? ccid3_first_li+0x400/0x400 [ 40.462945] dccp_deliver_input_to_ccids+0xf0/0x280 [ 40.467964] dccp_rcv_established+0x87/0xb0 [ 40.472277] dccp_v4_do_rcv+0x153/0x180 [ 40.476238] __sk_receive_skb+0x3e5/0xec0 [ 40.480373] ? sk_free+0x50/0x50 [ 40.483745] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 40.488228] ? reqsk_fastopen_remove+0x660/0x660 [ 40.492973] ? lock_downgrade+0x900/0x900 [ 40.497109] ? check_preemption_disabled+0x48/0x280 [ 40.502112] ? dccp_invalid_packet+0x64/0x880 [ 40.506594] dccp_v4_rcv+0x10f9/0x1f58 [ 40.510471] ? dccp_v4_err+0x18a0/0x18a0 [ 40.514524] ? __lock_is_held+0xb5/0x140 [ 40.518575] ip_local_deliver_finish+0x2e9/0xda0 [ 40.523319] ? ip_sublist_rcv_finish+0x3a0/0x3a0 [ 40.528063] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.533067] ? nf_hook_slow+0x11e/0x1c0 [ 40.537026] ip_local_deliver+0x1e9/0x750 [ 40.541164] ? ip_call_ra_chain+0x730/0x730 [ 40.545473] ? ip_sublist_rcv_finish+0x3a0/0x3a0 [ 40.550212] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 40.555126] ? kasan_check_read+0x11/0x20 [ 40.559259] ? rcu_softirq_qs+0x20/0x20 [ 40.563220] ip_rcv_finish+0x1f9/0x300 [ 40.567093] ip_rcv+0xed/0x600 [ 40.570287] ? ip_local_deliver+0x750/0x750 [ 40.574605] ? ip_rcv_finish_core.isra.16+0x1f40/0x1f40 [ 40.579962] ? lock_acquire+0x1ed/0x520 [ 40.583926] ? process_backlog+0x1dd/0x7a0 [ 40.588149] __netif_receive_skb_one_core+0x14d/0x200 [ 40.593328] ? __netif_receive_skb_core+0x3b30/0x3b30 [ 40.598527] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 40.603787] ? rcu_softirq_qs+0x20/0x20 [ 40.607746] ? trace_hardirqs_off_caller+0x310/0x310 [ 40.612842] __netif_receive_skb+0x2c/0x1e0 [ 40.617338] process_backlog+0x24e/0x7a0 [ 40.621391] net_rx_action+0x7fa/0x19b0 [ 40.625358] ? napi_complete_done+0x7a0/0x7a0 [ 40.629838] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 40.635101] ? rcu_softirq_qs+0x20/0x20 [ 40.639064] ? rebalance_domains+0x375/0xdc0 [ 40.643465] ? load_balance+0x39a0/0x39a0 [ 40.647602] ? enqueue_hrtimer+0x1a5/0x560 [ 40.651849] ? find_held_lock+0x36/0x1c0 [ 40.655930] ? pvclock_read_flags+0x160/0x160 [ 40.660414] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.665938] ? check_preemption_disabled+0x48/0x280 [ 40.670947] ? print_usage_bug+0xc0/0xc0 [ 40.674995] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.680536] ? check_preemption_disabled+0x48/0x280 [ 40.685545] ? __local_bh_enable+0xf6/0x140 [ 40.689869] ? zap_class+0x640/0x640 [ 40.693581] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.699106] ? check_preemption_disabled+0x48/0x280 [ 40.704115] ? __lock_is_held+0xb5/0x140 [ 40.708172] __do_softirq+0x308/0xb7e [ 40.711980] ? __irqentry_text_end+0x1f9658/0x1f9658 [ 40.717066] ? irq_exit+0xbd/0x1c0 [ 40.720591] ? smp_apic_timer_interrupt+0x1cb/0x760 [ 40.725595] ? smp_reschedule_interrupt+0x109/0x650 [ 40.730601] ? smp_call_function_single_interrupt+0x650/0x650 [ 40.736472] ? ret_from_intr+0xb/0x1e [ 40.740261] ? trace_hardirqs_off_caller+0xbb/0x310 [ 40.745263] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.750093] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.755095] ? task_prio+0x50/0x50 [ 40.758624] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.764150] ? check_preemption_disabled+0x48/0x280 [ 40.769161] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.774008] ? ip_finish_output2+0xa83/0x1860 [ 40.778494] do_softirq_own_stack+0x2a/0x40 [ 40.782812] [ 40.785037] do_softirq.part.14+0x126/0x160 [ 40.789345] __local_bh_enable_ip+0x21d/0x260 [ 40.793830] ip_finish_output2+0xab6/0x1860 [ 40.798137] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 40.803072] ? ip_copy_metadata+0xe10/0xe10 [ 40.807380] ? zap_class+0x640/0x640 [ 40.811097] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.816635] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.822168] ? ipv4_mtu+0x39f/0x590 [ 40.825785] ? __lock_is_held+0xb5/0x140 [ 40.829839] ip_finish_output+0x7fd/0xfa0 [ 40.833975] ? ip_finish_output+0x7fd/0xfa0 [ 40.838284] ? ip_fragment.constprop.50+0x240/0x240 [ 40.843285] ? kasan_check_read+0x11/0x20 [ 40.847418] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 40.852678] ? rcu_softirq_qs+0x20/0x20 [ 40.856641] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.861647] ? nf_hook_slow+0x11e/0x1c0 [ 40.865614] ip_output+0x21d/0x8d0 [ 40.869142] ? ip_mc_output+0x15b0/0x15b0 [ 40.873278] ? ip_fragment.constprop.50+0x240/0x240 [ 40.878282] ? __lock_is_held+0xb5/0x140 [ 40.882336] ip_local_out+0xc5/0x1b0 [ 40.886037] __ip_queue_xmit+0x9af/0x1f30 [ 40.890174] ? ip_build_and_send_pkt+0xc90/0xc90 [ 40.894937] ? __skb_checksum+0x920/0x920 [ 40.899076] ? skb_send_sock+0x50/0x50 [ 40.902951] ? reqsk_fastopen_remove+0x660/0x660 [ 40.907694] ? dccp_insert_option_padding+0xbc/0xe0 [ 40.912704] ip_queue_xmit+0x56/0x70 [ 40.916404] dccp_transmit_skb+0x98c/0x12e0 [ 40.920732] dccp_xmit_packet+0x25e/0x7d0 [ 40.924881] ? _copy_from_iter_full+0x2b8/0xc20 [ 40.929541] ? dccp_send_sync+0x270/0x270 [ 40.933681] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.938683] ? ccid3_hc_tx_send_packet+0x358/0x876 [ 40.943608] dccp_write_xmit+0x190/0x1f0 [ 40.947682] dccp_sendmsg+0xdc8/0x1020 [ 40.951566] ? dccp_setsockopt_cscov.part.10+0x290/0x290 [ 40.957010] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 40.961927] ? aa_sk_perm+0x218/0x8b0 [ 40.965714] ? import_iovec+0x269/0x470 [ 40.969682] ? aa_af_perm+0x5a0/0x5a0 [ 40.973476] inet_sendmsg+0x1a1/0x690 [ 40.977280] ? ipip_gro_receive+0x100/0x100 [ 40.981592] ? apparmor_socket_sendmsg+0x29/0x30 [ 40.986376] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.991910] ? security_socket_sendmsg+0x94/0xc0 [ 40.996664] ? ipip_gro_receive+0x100/0x100 [ 41.000973] sock_sendmsg+0xd5/0x120 [ 41.004678] ___sys_sendmsg+0x7fd/0x930 [ 41.008640] ? copy_msghdr_from_user+0x580/0x580 [ 41.013401] ? _raw_spin_unlock_bh+0x30/0x40 [ 41.017813] ? check_preemption_disabled+0x48/0x280 [ 41.022823] ? __fget_light+0x2e9/0x430 [ 41.026784] ? fget_raw+0x20/0x20 [ 41.030225] ? release_sock+0x1ec/0x2c0 [ 41.034187] ? lock_sock_nested+0x9a/0x120 [ 41.038422] ? __release_sock+0x3a0/0x3a0 [ 41.042558] ? __local_bh_enable_ip+0x160/0x260 [ 41.047221] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.052747] ? sockfd_lookup_light+0xc5/0x160 [ 41.057232] __sys_sendmsg+0x11d/0x280 [ 41.061106] ? __ia32_sys_shutdown+0x80/0x80 [ 41.065501] ? __x64_sys_futex+0x47f/0x6a0 [ 41.069720] ? do_syscall_64+0x9a/0x820 [ 41.073682] ? do_syscall_64+0x9a/0x820 [ 41.077645] ? trace_hardirqs_off_caller+0x310/0x310 [ 41.082739] ? trace_hardirqs_off+0xb8/0x310 [ 41.087148] __x64_sys_sendmsg+0x78/0xb0 [ 41.091202] do_syscall_64+0x1b9/0x820 [ 41.095075] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 41.100427] ? syscall_return_slowpath+0x5e0/0x5e0 [ 41.105346] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.110350] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 41.115353] ? post_copy_siginfo_from_user.isra.25.part.26+0x250/0x250 [ 41.122008] ? __switch_to_asm+0x40/0x70 [ 41.126072] ? __switch_to_asm+0x34/0x70 [ 41.130121] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.134954] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.140127] RIP: 0033:0x446a69 [ 41.143307] 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 [ 41.162194] RSP: 002b:00007f2521ee0da8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e [ 41.169892] RAX: ffffffffffffffda RBX: 00000000006dcc68 RCX: 0000000000446a69 [ 41.177147] RDX: 0000000000000800 RSI: 00000000200004c0 RDI: 0000000000000005 [ 41.184403] RBP: 00000000006dcc60 R08: 0000000000000000 R09: 0000000000000000 [ 41.191660] R10: 0000000000000000 R11: 0000000000000293 R12: 00000000006dcc6c [ 41.198915] R13: b8f0db312c1fe558 R14: d6bf4eea9265b264 R15: 0000000000000005