[ 70.724900][ T27] audit: type=1800 audit(1564254212.554:27): pid=10097 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 70.766361][ T27] audit: type=1800 audit(1564254212.554:28): pid=10097 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 71.286855][ T27] audit: type=1800 audit(1564254213.204:29): pid=10097 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 [ 71.307503][ T27] audit: type=1800 audit(1564254213.214:30): pid=10097 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 '10.128.0.77' (ECDSA) to the list of known hosts. syzkaller login: [ 200.768597][T10253] IPVS: ftp: loaded support on port[0] = 21 [ 200.811566][T10253] chnl_net:caif_netlink_parms(): no params data found [ 200.832829][T10253] bridge0: port 1(bridge_slave_0) entered blocking state [ 200.840284][T10253] bridge0: port 1(bridge_slave_0) entered disabled state [ 200.848440][T10253] device bridge_slave_0 entered promiscuous mode [ 200.855793][T10253] bridge0: port 2(bridge_slave_1) entered blocking state [ 200.863155][T10253] bridge0: port 2(bridge_slave_1) entered disabled state [ 200.870977][T10253] device bridge_slave_1 entered promiscuous mode [ 200.884498][T10253] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 200.894916][T10253] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 200.912423][T10253] team0: Port device team_slave_0 added [ 200.919515][T10253] team0: Port device team_slave_1 added [ 200.968423][T10253] device hsr_slave_0 entered promiscuous mode [ 201.036921][T10253] device hsr_slave_1 entered promiscuous mode [ 201.092043][T10253] bridge0: port 2(bridge_slave_1) entered blocking state [ 201.099244][T10253] bridge0: port 2(bridge_slave_1) entered forwarding state [ 201.106687][T10253] bridge0: port 1(bridge_slave_0) entered blocking state [ 201.114266][T10253] bridge0: port 1(bridge_slave_0) entered forwarding state [ 201.139816][T10253] 8021q: adding VLAN 0 to HW filter on device bond0 [ 201.150717][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 201.169426][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 201.177142][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 201.184726][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 201.194987][T10253] 8021q: adding VLAN 0 to HW filter on device team0 [ 201.204834][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 201.213413][ T3014] bridge0: port 1(bridge_slave_0) entered blocking state [ 201.220594][ T3014] bridge0: port 1(bridge_slave_0) entered forwarding state [ 201.237016][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 201.245394][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 201.252649][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 201.260584][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 201.268956][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 201.278412][T10255] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 201.288095][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 201.298922][T10253] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 201.311266][T10253] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 201.319491][T10255] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 201.334213][T10253] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 201.365753][ C0] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 306.526531][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 306.533527][ C0] rcu: 0-....: (10500 ticks this GP) idle=056/1/0x4000000000000002 softirq=10383/10383 fqs=5250 [ 306.544104][ C0] (t=10502 jiffies g=10425 q=62) [ 306.549299][ C0] NMI backtrace for cpu 0 [ 306.553743][ C0] CPU: 0 PID: 10253 Comm: syz-executor866 Not tainted 5.3.0-rc1-next-20190726 #53 [ 306.562919][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 306.572976][ C0] Call Trace: [ 306.576515][ C0] [ 306.579458][ C0] dump_stack+0x172/0x1f0 [ 306.583801][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 306.588996][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 306.595237][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 306.600870][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 306.606860][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 306.612755][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 306.617888][ C0] ? find_next_bit+0x107/0x130 [ 306.622654][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 306.628197][ C0] ? raise_softirq+0x138/0x340 [ 306.632961][ C0] update_process_times+0x32/0x80 [ 306.637985][ C0] tick_sched_handle+0xa2/0x190 [ 306.642831][ C0] tick_sched_timer+0x53/0x140 [ 306.647596][ C0] __hrtimer_run_queues+0x364/0xe40 [ 306.652798][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 306.658087][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 306.663636][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 306.669358][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 306.675423][ C0] hrtimer_interrupt+0x314/0x770 [ 306.680447][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 306.686022][ C0] apic_timer_interrupt+0xf/0x20 [ 306.690958][ C0] RIP: 0010:native_queued_spin_lock_slowpath+0xaa/0x9f0 [ 306.697902][ C0] Code: 0f 1f 44 00 00 49 89 fe 49 89 fd 41 bc 01 00 00 00 49 c1 ee 03 41 83 e5 07 48 b8 00 00 00 00 00 fc ff df 49 01 c6 41 83 c5 03 04 00 00 00 48 89 df e8 89 70 53 00 41 0f b6 06 41 38 c5 7c 08 [ 306.717685][ C0] RSP: 0018:ffff8880ae809210 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 306.726101][ C0] RAX: 0000000000000000 RBX: ffff8880a80c8d08 RCX: ffffffff8159a3d7 [ 306.734074][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880a80c8d08 [ 306.742049][ C0] RBP: ffff8880ae8092d0 R08: 1ffff110150191a1 R09: ffffed10150191a2 [ 306.750049][ C0] R10: ffffed10150191a1 R11: ffff8880a80c8d0b R12: 0000000000000001 [ 306.758023][ C0] R13: 0000000000000003 R14: ffffed10150191a1 R15: 0000000000000001 [ 306.766033][ C0] ? apic_timer_interrupt+0xa/0x20 [ 306.771178][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 306.777513][ C0] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 306.783775][ C0] ? mark_held_locks+0xf0/0xf0 [ 306.788567][ C0] do_raw_spin_lock+0x20e/0x2e0 [ 306.793420][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 306.798358][ C0] ? lock_acquire+0x190/0x410 [ 306.803098][ C0] ? release_sock+0x20/0x1c0 [ 306.807700][ C0] ? __kasan_check_read+0x11/0x20 [ 306.812763][ C0] _raw_spin_lock_bh+0x3b/0x50 [ 306.817542][ C0] ? release_sock+0x20/0x1c0 [ 306.822171][ C0] release_sock+0x20/0x1c0 [ 306.826786][ C0] wait_on_pending_writer+0x20f/0x420 [ 306.832225][ C0] ? ip6_rcv_finish+0x1de/0x2f0 [ 306.837081][ C0] ? tls_init+0x560/0x560 [ 306.841479][ C0] ? process_backlog+0x206/0x750 [ 306.846447][ C0] ? net_rx_action+0x508/0x10c0 [ 306.851297][ C0] ? __do_softirq+0x262/0x98c [ 306.855979][ C0] ? prepare_to_wait_exclusive+0x320/0x320 [ 306.861870][ C0] ? inet_release+0xed/0x200 [ 306.866499][ C0] ? inet6_release+0x53/0x80 [ 306.871138][ C0] ? __sock_release+0xce/0x280 [ 306.875910][ C0] ? sock_close+0x1e/0x30 [ 306.880237][ C0] ? __fput+0x2ff/0x890 [ 306.884397][ C0] ? ____fput+0x16/0x20 [ 306.888547][ C0] ? task_work_run+0x145/0x1c0 [ 306.893314][ C0] ? exit_to_usermode_loop+0x316/0x380 [ 306.900281][ C0] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 306.905567][ C0] ? wait_on_pending_writer+0x420/0x420 [ 306.911115][ C0] tls_sk_proto_unhash+0x90/0x3f0 [ 306.916210][ C0] tcp_set_state+0x5b9/0x7d0 [ 306.920807][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 306.927061][ C0] ? __sk_mem_reduce_allocated+0x1b0/0x560 [ 306.932882][ C0] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 306.938348][ C0] ? __sk_mem_reclaim+0x55/0x70 [ 306.943230][ C0] ? tcp_write_queue_purge+0x5d8/0x1310 [ 306.948951][ C0] ? inet6_sk_rx_dst_set+0x244/0x6f0 [ 306.954241][ C0] tcp_done+0xe2/0x320 [ 306.958308][ C0] tcp_reset+0x132/0x500 [ 306.962552][ C0] tcp_validate_incoming+0xa2d/0x1660 [ 306.967931][ C0] tcp_rcv_established+0x6b5/0x1e70 [ 306.973136][ C0] ? mark_held_locks+0xf0/0xf0 [ 306.978440][ C0] ? sk_filter_trim_cap+0x45f/0xb30 [ 306.983660][ C0] ? tcp_data_queue+0x4860/0x4860 [ 306.988685][ C0] ? do_raw_spin_lock+0x12a/0x2e0 [ 306.993701][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 306.998659][ C0] ? lock_acquire+0x190/0x410 [ 307.003356][ C0] tcp_v6_do_rcv+0x41e/0x12c0 [ 307.009309][ C0] tcp_v6_rcv+0x31f1/0x3500 [ 307.013835][ C0] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 307.019551][ C0] ? nf_confirm+0x360/0x4d0 [ 307.024058][ C0] ? mark_held_locks+0xf0/0xf0 [ 307.028848][ C0] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 307.034523][ C0] ip6_input_finish+0x84/0x170 [ 307.039350][ C0] ip6_input+0xe4/0x3f0 [ 307.043505][ C0] ? ip6_input_finish+0x170/0x170 [ 307.048542][ C0] ? __kasan_check_read+0x11/0x20 [ 307.053580][ C0] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 307.059472][ C0] ? lock_downgrade+0x920/0x920 [ 307.064318][ C0] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 307.070651][ C0] ip6_rcv_finish+0x1de/0x2f0 [ 307.075343][ C0] ipv6_rcv+0x10e/0x420 [ 307.079584][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 307.085125][ C0] ? lock_downgrade+0x920/0x920 [ 307.089966][ C0] ? lock_downgrade+0x920/0x920 [ 307.094817][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 307.100706][ C0] ? trace_hardirqs_off+0x62/0x240 [ 307.105823][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 307.111295][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 307.117190][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 307.123083][ C0] ? lock_acquire+0x190/0x410 [ 307.127756][ C0] ? process_backlog+0x195/0x750 [ 307.132696][ C0] __netif_receive_skb+0x2c/0x1d0 [ 307.137720][ C0] process_backlog+0x206/0x750 [ 307.142479][ C0] ? lock_acquire+0x190/0x410 [ 307.147151][ C0] ? clockevents_program_event+0x15a/0x370 [ 307.152959][ C0] net_rx_action+0x508/0x10c0 [ 307.157660][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 307.162854][ C0] ? sched_clock+0x2e/0x50 [ 307.167272][ C0] ? kvm_clock_read+0x18/0x30 [ 307.171957][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 307.177595][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 307.183835][ C0] __do_softirq+0x262/0x98c [ 307.188336][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 307.193709][ C0] do_softirq_own_stack+0x2a/0x40 [ 307.198738][ C0] [ 307.201678][ C0] do_softirq.part.0+0x11a/0x170 [ 307.206682][ C0] __local_bh_enable_ip+0x211/0x270 [ 307.211896][ C0] inet_csk_listen_stop+0x1e0/0x850 [ 307.217098][ C0] tcp_close+0xd5b/0x10e0 [ 307.221437][ C0] ? ip_mc_drop_socket+0x211/0x270 [ 307.226546][ C0] ? down_write+0xdf/0x150 [ 307.230955][ C0] inet_release+0xed/0x200 [ 307.235365][ C0] inet6_release+0x53/0x80 [ 307.239785][ C0] __sock_release+0xce/0x280 [ 307.244371][ C0] sock_close+0x1e/0x30 [ 307.248520][ C0] __fput+0x2ff/0x890 [ 307.252496][ C0] ? __sock_release+0x280/0x280 [ 307.257356][ C0] ____fput+0x16/0x20 [ 307.261333][ C0] task_work_run+0x145/0x1c0 [ 307.265923][ C0] exit_to_usermode_loop+0x316/0x380 [ 307.271216][ C0] do_syscall_64+0x65f/0x760 [ 307.275807][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 307.281690][ C0] RIP: 0033:0x406571 [ 307.285603][ 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 [ 307.305211][ C0] RSP: 002b:00007fff8a980ef0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 307.313621][ C0] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406571 [ 307.321591][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 307.329558][ C0] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 307.337533][ C0] R10: 00007fff8a980f20 R11: 0000000000000293 R12: 00007fff8a980f50 [ 307.345518][ C0] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007 [ 311.776620][ T3516] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 10997 jiffies s: 105 root: 0x1/. [ 311.788319][ T3516] rcu: blocking rcu_node structures: [ 311.793806][ T3516] Task dump for CPU 0: [ 311.798293][ T3516] syz-executor866 R running task 24264 10253 10252 0x8000000a [ 311.806209][ T3516] Call Trace: [ 311.809892][ T3516] ? __kasan_check_read+0x11/0x20 [ 311.814976][ T3516] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 311.821569][ T3516] ? lock_downgrade+0x920/0x920 [ 311.826435][ T3516] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 311.833007][ T3516] ? __this_cpu_preempt_check+0x3a/0x210 [ 311.838885][ T3516] ? inet_csk_listen_stop+0x1bc/0x850 [ 311.844271][ T3516] ? ksoftirqd_running+0x16/0x70 [ 311.849538][ T3516] ? inet_csk_listen_stop+0x1bc/0x850 [ 311.854923][ T3516] ? do_softirq.part.0+0x11a/0x170 [ 311.860461][ T3516] ? __local_bh_enable_ip+0x211/0x270 [ 311.865852][ T3516] ? inet_csk_listen_stop+0x1e0/0x850 [ 311.871622][ T3516] ? tcp_close+0xd5b/0x10e0 [ 311.876160][ T3516] ? ip_mc_drop_socket+0x211/0x270 [ 311.881723][ T3516] ? down_write+0xdf/0x150 [ 311.886181][ T3516] ? inet_release+0xed/0x200 [ 311.891157][ T3516] ? inet6_release+0x53/0x80 [ 311.895759][ T3516] ? __sock_release+0xce/0x280 [ 311.900903][ T3516] ? sock_close+0x1e/0x30 [ 311.905262][ T3516] ? __fput+0x2ff/0x890 [ 311.909819][ T3516] ? __sock_release+0x280/0x280 [ 311.914710][ T3516] ? ____fput+0x16/0x20 [ 311.919412][ T3516] ? task_work_run+0x145/0x1c0 [ 311.924203][ T3516] ? exit_to_usermode_loop+0x316/0x380 [ 311.930037][ T3516] ? do_syscall_64+0x65f/0x760 [ 311.934816][ T3516] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe