[....] 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. [ 64.476585][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.476595][ T26] audit: type=1800 audit(1564498154.582:29): pid=9654 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 [ 64.502781][ T26] audit: type=1800 audit(1564498154.582:30): pid=9654 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 '10.128.0.199' (ECDSA) to the list of known hosts. syzkaller login: [ 183.773612][ T9808] IPVS: ftp: loaded support on port[0] = 21 [ 183.814461][ T9808] chnl_net:caif_netlink_parms(): no params data found [ 183.840209][ T9808] bridge0: port 1(bridge_slave_0) entered blocking state [ 183.847583][ T9808] bridge0: port 1(bridge_slave_0) entered disabled state [ 183.855205][ T9808] device bridge_slave_0 entered promiscuous mode [ 183.862739][ T9808] bridge0: port 2(bridge_slave_1) entered blocking state [ 183.870236][ T9808] bridge0: port 2(bridge_slave_1) entered disabled state [ 183.877878][ T9808] device bridge_slave_1 entered promiscuous mode [ 183.892517][ T9808] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 183.903134][ T9808] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 183.919318][ T9808] team0: Port device team_slave_0 added [ 183.925775][ T9808] team0: Port device team_slave_1 added [ 184.008336][ T9808] device hsr_slave_0 entered promiscuous mode [ 184.077169][ T9808] device hsr_slave_1 entered promiscuous mode [ 184.152079][ T9808] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.159210][ T9808] bridge0: port 2(bridge_slave_1) entered forwarding state [ 184.166632][ T9808] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.173826][ T9808] bridge0: port 1(bridge_slave_0) entered forwarding state [ 184.199055][ T9808] 8021q: adding VLAN 0 to HW filter on device bond0 [ 184.210029][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 184.228471][ T2984] bridge0: port 1(bridge_slave_0) entered disabled state [ 184.236170][ T2984] bridge0: port 2(bridge_slave_1) entered disabled state [ 184.243953][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 184.254002][ T9808] 8021q: adding VLAN 0 to HW filter on device team0 [ 184.263117][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 184.271928][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.279009][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 184.298481][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 184.306995][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.314050][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 184.322116][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 184.331446][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 184.339871][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 184.348017][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 184.356884][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 184.365631][ T9808] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 184.379777][ T9808] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 184.406909][ C1] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 289.606751][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 289.613509][ C0] rcu: 0-...!: (1 GPs behind) idle=442/1/0x4000000000000002 softirq=9450/9451 fqs=0 [ 289.623115][ C0] (t=10501 jiffies g=9217 q=2) [ 289.627945][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g9217 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 289.639016][ C0] rcu: RCU grace-period kthread stack dump: [ 289.644883][ C0] rcu_preempt R running task 29528 10 2 0x80004000 [ 289.652774][ C0] Call Trace: [ 289.656097][ C0] __schedule+0x755/0x15b0 [ 289.660501][ C0] ? __sched_text_start+0x8/0x8 [ 289.665348][ C0] schedule+0xa8/0x270 [ 289.669441][ C0] schedule_timeout+0x486/0xc50 [ 289.674285][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 289.679209][ C0] ? usleep_range+0x170/0x170 [ 289.684859][ C0] ? trace_hardirqs_on+0x67/0x240 [ 289.689858][ C0] ? __kasan_check_read+0x11/0x20 [ 289.694862][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 289.700391][ C0] ? swake_up_one+0x60/0x60 [ 289.704874][ C0] ? trace_hardirqs_on+0x67/0x240 [ 289.709883][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 289.714639][ C0] ? rcu_barrier+0x310/0x310 [ 289.719230][ C0] ? trace_hardirqs_on+0x67/0x240 [ 289.724405][ C0] ? __kasan_check_read+0x11/0x20 [ 289.729425][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 289.735642][ C0] ? __kthread_parkme+0x108/0x1c0 [ 289.740641][ C0] ? __kasan_check_read+0x11/0x20 [ 289.745654][ C0] kthread+0x361/0x430 [ 289.749703][ C0] ? rcu_barrier+0x310/0x310 [ 289.754284][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 289.760506][ C0] ret_from_fork+0x24/0x30 [ 289.764960][ C0] NMI backtrace for cpu 0 [ 289.769272][ C0] CPU: 0 PID: 9808 Comm: syz-executor790 Not tainted 5.3.0-rc2-next-20190730 #55 [ 289.778381][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 289.788426][ C0] Call Trace: [ 289.791727][ C0] [ 289.794624][ C0] dump_stack+0x172/0x1f0 [ 289.798935][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 289.804113][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 289.810346][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 289.815957][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 289.821916][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 289.827961][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 289.833054][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 289.838579][ C0] ? raise_softirq+0x138/0x340 [ 289.843331][ C0] update_process_times+0x32/0x80 [ 289.848336][ C0] tick_sched_handle+0xa2/0x190 [ 289.853164][ C0] tick_sched_timer+0x53/0x140 [ 289.857911][ C0] __hrtimer_run_queues+0x364/0xe40 [ 289.863097][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 289.868376][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 289.873903][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 289.879606][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 289.885653][ C0] hrtimer_interrupt+0x314/0x770 [ 289.890579][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 289.896102][ C0] apic_timer_interrupt+0xf/0x20 [ 289.901024][ C0] RIP: 0010:native_queued_spin_lock_slowpath+0x132/0x9f0 [ 289.908030][ C0] Code: 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 37 07 00 00 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f3 90 73 ff ff ff 8b 45 98 4c 8d 65 d8 3d 00 01 00 00 0f 84 e5 00 00 [ 289.927614][ C0] RSP: 0018:ffff8880ae809210 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 289.936001][ C0] RAX: 0000000000000000 RBX: ffff88809590cd08 RCX: ffffffff8158f237 [ 289.943951][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88809590cd08 [ 289.951990][ C0] RBP: ffff8880ae8092d0 R08: 1ffff11012b219a1 R09: ffffed1012b219a2 [ 289.959956][ C0] R10: ffffed1012b219a1 R11: ffff88809590cd0b R12: 0000000000000001 [ 289.967906][ C0] R13: 0000000000000003 R14: ffffed1012b219a1 R15: 0000000000000001 [ 289.975887][ C0] ? apic_timer_interrupt+0xa/0x20 [ 289.980985][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 289.987300][ C0] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 289.993583][ C0] ? mark_held_locks+0xf0/0xf0 [ 289.998510][ C0] do_raw_spin_lock+0x20e/0x2e0 [ 290.003344][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 290.008267][ C0] ? lock_acquire+0x190/0x410 [ 290.012982][ C0] ? release_sock+0x20/0x1c0 [ 290.017554][ C0] ? __kasan_check_read+0x11/0x20 [ 290.022564][ C0] _raw_spin_lock_bh+0x3b/0x50 [ 290.027305][ C0] ? release_sock+0x20/0x1c0 [ 290.031871][ C0] release_sock+0x20/0x1c0 [ 290.036325][ C0] wait_on_pending_writer+0x20f/0x420 [ 290.041707][ C0] ? ip6_rcv_finish+0x1de/0x2f0 [ 290.046544][ C0] ? tls_init+0x560/0x560 [ 290.050873][ C0] ? process_backlog+0x206/0x750 [ 290.055787][ C0] ? net_rx_action+0x508/0x10c0 [ 290.060634][ C0] ? __do_softirq+0x262/0x98c [ 290.066836][ C0] ? prepare_to_wait_exclusive+0x320/0x320 [ 290.072708][ C0] ? inet_release+0xed/0x200 [ 290.077281][ C0] ? inet6_release+0x53/0x80 [ 290.081894][ C0] ? __sock_release+0xce/0x280 [ 290.086671][ C0] ? sock_close+0x1e/0x30 [ 290.090978][ C0] ? __fput+0x2ff/0x890 [ 290.095109][ C0] ? ____fput+0x16/0x20 [ 290.099252][ C0] ? task_work_run+0x145/0x1c0 [ 290.104001][ C0] ? exit_to_usermode_loop+0x316/0x380 [ 290.109440][ C0] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 290.114642][ C0] ? wait_on_pending_writer+0x420/0x420 [ 290.120173][ C0] tls_sk_proto_unhash+0x90/0x3f0 [ 290.125406][ C0] tcp_set_state+0x5b9/0x7d0 [ 290.129990][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 290.136211][ C0] ? __sk_mem_reduce_allocated+0x1b0/0x560 [ 290.141997][ C0] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 290.147435][ C0] ? __sk_mem_reclaim+0x55/0x70 [ 290.152265][ C0] ? tcp_write_queue_purge+0x5d8/0x1310 [ 290.157925][ C0] ? inet6_sk_rx_dst_set+0x244/0x6f0 [ 290.163193][ C0] tcp_done+0xe2/0x320 [ 290.167260][ C0] tcp_reset+0x132/0x500 [ 290.171489][ C0] tcp_validate_incoming+0xa2d/0x1660 [ 290.176844][ C0] tcp_rcv_established+0x6b5/0x1e70 [ 290.182036][ C0] ? mark_held_locks+0xf0/0xf0 [ 290.186836][ C0] ? sk_filter_trim_cap+0x45f/0xb30 [ 290.192021][ C0] ? tcp_data_queue+0x4860/0x4860 [ 290.197022][ C0] ? do_raw_spin_lock+0x12a/0x2e0 [ 290.202027][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 290.206950][ C0] ? lock_acquire+0x190/0x410 [ 290.211614][ C0] tcp_v6_do_rcv+0x41e/0x12c0 [ 290.216271][ C0] tcp_v6_rcv+0x31f1/0x3500 [ 290.221251][ C0] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 290.226813][ C0] ? nf_confirm+0x360/0x4d0 [ 290.231661][ C0] ? mark_held_locks+0xf0/0xf0 [ 290.236505][ C0] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 290.242294][ C0] ip6_input_finish+0x84/0x170 [ 290.247048][ C0] ip6_input+0xe4/0x3f0 [ 290.251183][ C0] ? ip6_input_finish+0x170/0x170 [ 290.256275][ C0] ? __kasan_check_read+0x11/0x20 [ 290.261286][ C0] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 290.267164][ C0] ? lock_downgrade+0x920/0x920 [ 290.272000][ C0] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 290.278225][ C0] ip6_rcv_finish+0x1de/0x2f0 [ 290.282883][ C0] ipv6_rcv+0x10e/0x420 [ 290.287020][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 290.292547][ C0] ? lock_downgrade+0x920/0x920 [ 290.297380][ C0] ? lock_downgrade+0x920/0x920 [ 290.302238][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 290.308287][ C0] ? trace_hardirqs_off+0x62/0x240 [ 290.313553][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 290.318991][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 290.324912][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 290.330789][ C0] ? lock_acquire+0x190/0x410 [ 290.335445][ C0] ? process_backlog+0x195/0x750 [ 290.340364][ C0] __netif_receive_skb+0x2c/0x1d0 [ 290.345364][ C0] process_backlog+0x206/0x750 [ 290.350107][ C0] ? lock_acquire+0x190/0x410 [ 290.354769][ C0] ? clockevents_program_event+0x15a/0x370 [ 290.360554][ C0] net_rx_action+0x508/0x10c0 [ 290.365217][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 290.370395][ C0] ? sched_clock+0x2e/0x50 [ 290.374803][ C0] ? kvm_clock_read+0x18/0x30 [ 290.379461][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 290.384899][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 290.391127][ C0] __do_softirq+0x262/0x98c [ 290.395618][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 290.400977][ C0] do_softirq_own_stack+0x2a/0x40 [ 290.405975][ C0] [ 290.408892][ C0] do_softirq.part.0+0x11a/0x170 [ 290.413807][ C0] __local_bh_enable_ip+0x211/0x270 [ 290.419079][ C0] inet_csk_listen_stop+0x1e0/0x850 [ 290.424259][ C0] tcp_close+0xd5b/0x10e0 [ 290.428569][ C0] ? ip_mc_drop_socket+0x211/0x270 [ 290.433657][ C0] ? down_write+0xdf/0x150 [ 290.438053][ C0] inet_release+0xed/0x200 [ 290.442451][ C0] inet6_release+0x53/0x80 [ 290.446845][ C0] __sock_release+0xce/0x280 [ 290.451414][ C0] sock_close+0x1e/0x30 [ 290.455549][ C0] __fput+0x2ff/0x890 [ 290.459513][ C0] ? __sock_release+0x280/0x280 [ 290.464346][ C0] ____fput+0x16/0x20 [ 290.468305][ C0] task_work_run+0x145/0x1c0 [ 290.472876][ C0] exit_to_usermode_loop+0x316/0x380 [ 290.478144][ C0] do_syscall_64+0x65f/0x760 [ 290.482717][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 290.488589][ C0] RIP: 0033:0x406571 [ 290.492470][ C0] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 290.512069][ C0] RSP: 002b:00007fff25b33790 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 290.520459][ C0] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406571 [ 290.528410][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 290.536360][ C0] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 290.544321][ C0] R10: 00007fff25b337c0 R11: 0000000000000293 R12: 00007fff25b337f0 [ 290.552288][ C0] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007