[ 70.339067][ T26] audit: type=1800 audit(1564367417.476:27): pid=10178 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 70.394009][ T26] audit: type=1800 audit(1564367417.586:28): pid=10178 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. [ 71.320994][ T26] audit: type=1800 audit(1564367418.516:29): pid=10178 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 [ 71.344271][ T26] audit: type=1800 audit(1564367418.516:30): pid=10178 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 '10.128.0.115' (ECDSA) to the list of known hosts. syzkaller login: [ 184.536818][T10331] IPVS: ftp: loaded support on port[0] = 21 [ 184.579866][T10331] chnl_net:caif_netlink_parms(): no params data found [ 184.600779][T10331] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.607892][T10331] bridge0: port 1(bridge_slave_0) entered disabled state [ 184.615892][T10331] device bridge_slave_0 entered promiscuous mode [ 184.623250][T10331] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.630381][T10331] bridge0: port 2(bridge_slave_1) entered disabled state [ 184.638053][T10331] device bridge_slave_1 entered promiscuous mode [ 184.652027][T10331] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 184.662124][T10331] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 184.677781][T10331] team0: Port device team_slave_0 added [ 184.684197][T10331] team0: Port device team_slave_1 added [ 184.730439][T10331] device hsr_slave_0 entered promiscuous mode [ 184.789113][T10331] device hsr_slave_1 entered promiscuous mode [ 184.864305][T10331] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.871382][T10331] bridge0: port 2(bridge_slave_1) entered forwarding state [ 184.878649][T10331] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.885707][T10331] bridge0: port 1(bridge_slave_0) entered forwarding state [ 184.910425][T10331] 8021q: adding VLAN 0 to HW filter on device bond0 [ 184.921062][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 184.939241][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 184.946833][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 184.954675][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 184.965264][T10331] 8021q: adding VLAN 0 to HW filter on device team0 [ 184.974882][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 184.983295][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.990371][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 185.009403][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 185.017617][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 185.024674][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 185.032507][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 185.040820][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 185.049059][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 185.057233][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 185.065789][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 185.074367][T10331] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 185.088930][T10331] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 185.121021][ C1] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 290.278821][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 290.285475][ C1] rcu: 1-...!: (10500 ticks this GP) idle=3c6/1/0x4000000000000002 softirq=10256/10256 fqs=0 [ 290.295794][ C1] (t=10502 jiffies g=10401 q=57) [ 290.300804][ C1] rcu: rcu_preempt kthread starved for 10503 jiffies! g10401 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 290.312137][ C1] rcu: RCU grace-period kthread stack dump: [ 290.318008][ C1] rcu_preempt I29392 10 2 0x80004000 [ 290.324320][ C1] Call Trace: [ 290.327594][ C1] __schedule+0x755/0x15b0 [ 290.331995][ C1] ? __sched_text_start+0x8/0x8 [ 290.336826][ C1] schedule+0xa8/0x270 [ 290.340874][ C1] schedule_timeout+0x486/0xc50 [ 290.345704][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 290.350810][ C1] ? usleep_range+0x170/0x170 [ 290.355463][ C1] ? trace_hardirqs_on+0x67/0x240 [ 290.360464][ C1] ? __kasan_check_read+0x11/0x20 [ 290.365482][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 290.371016][ C1] ? swake_up_one+0x60/0x60 [ 290.375495][ C1] ? trace_hardirqs_on+0x67/0x240 [ 290.380500][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 290.385251][ C1] ? rcu_barrier+0x310/0x310 [ 290.389818][ C1] ? trace_hardirqs_on+0x67/0x240 [ 290.394821][ C1] ? __kasan_check_read+0x11/0x20 [ 290.399830][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 290.406050][ C1] ? __kthread_parkme+0x108/0x1c0 [ 290.411054][ C1] ? __kasan_check_read+0x11/0x20 [ 290.416052][ C1] kthread+0x361/0x430 [ 290.420101][ C1] ? rcu_barrier+0x310/0x310 [ 290.424678][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 290.430906][ C1] ret_from_fork+0x24/0x30 [ 290.435345][ C1] NMI backtrace for cpu 1 [ 290.439686][ C1] CPU: 1 PID: 10331 Comm: syz-executor292 Not tainted 5.3.0-rc1-next-20190726 #53 [ 290.448868][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 290.458921][ C1] Call Trace: [ 290.462198][ C1] [ 290.465054][ C1] dump_stack+0x172/0x1f0 [ 290.469388][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 290.474582][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 290.480821][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 290.486475][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 290.492458][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 290.498350][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 290.503465][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 290.509538][ C1] ? raise_softirq+0x138/0x340 [ 290.514311][ C1] update_process_times+0x32/0x80 [ 290.519340][ C1] tick_sched_handle+0xa2/0x190 [ 290.524193][ C1] tick_sched_timer+0x53/0x140 [ 290.528983][ C1] __hrtimer_run_queues+0x364/0xe40 [ 290.534186][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 290.539477][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 290.545034][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 290.550746][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 290.556813][ C1] hrtimer_interrupt+0x314/0x770 [ 290.561755][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 290.567300][ C1] apic_timer_interrupt+0xf/0x20 [ 290.572240][ C1] RIP: 0010:native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 290.579171][ C1] Code: 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 be 04 00 00 00 48 89 df e8 89 70 53 00 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 4e 07 00 00 44 8b 3b 45 85 [ 290.598780][ C1] RSP: 0018:ffff8880ae909210 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 290.607199][ C1] RAX: 0000000000000001 RBX: ffff88808e6e8d48 RCX: ffffffff8159a3d7 [ 290.615668][ C1] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88808e6e8d48 [ 290.623637][ C1] RBP: ffff8880ae9092d0 R08: 1ffff11011cdd1a9 R09: ffffed1011cdd1aa [ 290.631608][ C1] R10: ffffed1011cdd1a9 R11: ffff88808e6e8d4b R12: 0000000000000001 [ 290.639594][ C1] R13: 0000000000000003 R14: ffffed1011cdd1a9 R15: 0000000000000001 [ 290.647609][ C1] ? apic_timer_interrupt+0xa/0x20 [ 290.652733][ C1] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 290.659066][ C1] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 290.665304][ C1] ? mark_held_locks+0xf0/0xf0 [ 290.670065][ C1] do_raw_spin_lock+0x20e/0x2e0 [ 290.674920][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 290.679858][ C1] ? lock_acquire+0x190/0x410 [ 290.684530][ C1] ? release_sock+0x20/0x1c0 [ 290.689118][ C1] ? __kasan_check_read+0x11/0x20 [ 290.694148][ C1] _raw_spin_lock_bh+0x3b/0x50 [ 290.698917][ C1] ? release_sock+0x20/0x1c0 [ 290.703517][ C1] release_sock+0x20/0x1c0 [ 290.707934][ C1] wait_on_pending_writer+0x20f/0x420 [ 290.713304][ C1] ? ip6_rcv_finish+0x1de/0x2f0 [ 290.718150][ C1] ? tls_init+0x560/0x560 [ 290.722473][ C1] ? process_backlog+0x206/0x750 [ 290.727404][ C1] ? net_rx_action+0x508/0x10c0 [ 290.732258][ C1] ? __do_softirq+0x262/0x98c [ 290.736991][ C1] ? prepare_to_wait_exclusive+0x320/0x320 [ 290.742801][ C1] ? inet_release+0xed/0x200 [ 290.747400][ C1] ? inet6_release+0x53/0x80 [ 290.751995][ C1] ? __sock_release+0xce/0x280 [ 290.756754][ C1] ? sock_close+0x1e/0x30 [ 290.761078][ C1] ? __fput+0x2ff/0x890 [ 290.765230][ C1] ? ____fput+0x16/0x20 [ 290.769387][ C1] ? task_work_run+0x145/0x1c0 [ 290.774143][ C1] ? exit_to_usermode_loop+0x316/0x380 [ 290.779633][ C1] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 290.784829][ C1] ? wait_on_pending_writer+0x420/0x420 [ 290.790376][ C1] tls_sk_proto_unhash+0x90/0x3f0 [ 290.795401][ C1] tcp_set_state+0x5b9/0x7d0 [ 290.799992][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 290.806237][ C1] ? __sk_mem_reduce_allocated+0x1b0/0x560 [ 290.812037][ C1] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 290.817489][ C1] ? __sk_mem_reclaim+0x55/0x70 [ 290.822341][ C1] ? tcp_write_queue_purge+0x5d8/0x1310 [ 290.827898][ C1] ? inet6_sk_rx_dst_set+0x244/0x6f0 [ 290.833176][ C1] tcp_done+0xe2/0x320 [ 290.837260][ C1] tcp_reset+0x132/0x500 [ 290.841524][ C1] tcp_validate_incoming+0xa2d/0x1660 [ 290.846910][ C1] tcp_rcv_established+0x6b5/0x1e70 [ 290.852108][ C1] ? mark_held_locks+0xf0/0xf0 [ 290.856876][ C1] ? sk_filter_trim_cap+0x45f/0xb30 [ 290.862080][ C1] ? tcp_data_queue+0x4860/0x4860 [ 290.867102][ C1] ? do_raw_spin_lock+0x12a/0x2e0 [ 290.872119][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 290.877048][ C1] ? lock_acquire+0x190/0x410 [ 290.881724][ C1] tcp_v6_do_rcv+0x41e/0x12c0 [ 290.886398][ C1] tcp_v6_rcv+0x31f1/0x3500 [ 290.890905][ C1] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 290.896450][ C1] ? nf_confirm+0x360/0x4d0 [ 290.900954][ C1] ? mark_held_locks+0xf0/0xf0 [ 290.905713][ C1] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 290.911358][ C1] ip6_input_finish+0x84/0x170 [ 290.916123][ C1] ip6_input+0xe4/0x3f0 [ 290.920278][ C1] ? ip6_input_finish+0x170/0x170 [ 290.925302][ C1] ? __kasan_check_read+0x11/0x20 [ 290.930330][ C1] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 290.936229][ C1] ? lock_downgrade+0x920/0x920 [ 290.941083][ C1] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 290.947324][ C1] ip6_rcv_finish+0x1de/0x2f0 [ 290.952010][ C1] ipv6_rcv+0x10e/0x420 [ 290.956166][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 290.961623][ C1] ? lock_downgrade+0x920/0x920 [ 290.966471][ C1] ? lock_downgrade+0x920/0x920 [ 290.971324][ C1] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 290.977242][ C1] ? trace_hardirqs_off+0x62/0x240 [ 290.982355][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 290.987813][ C1] __netif_receive_skb_one_core+0x113/0x1a0 [ 290.993729][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 290.999620][ C1] ? lock_acquire+0x190/0x410 [ 291.004291][ C1] ? process_backlog+0x195/0x750 [ 291.009245][ C1] __netif_receive_skb+0x2c/0x1d0 [ 291.014264][ C1] process_backlog+0x206/0x750 [ 291.019023][ C1] ? lock_acquire+0x190/0x410 [ 291.023700][ C1] ? clockevents_program_event+0x15a/0x370 [ 291.029511][ C1] net_rx_action+0x508/0x10c0 [ 291.034185][ C1] ? napi_complete_done+0x4b0/0x4b0 [ 291.039377][ C1] ? sched_clock+0x2e/0x50 [ 291.043802][ C1] ? kvm_clock_read+0x18/0x30 [ 291.048502][ C1] ? inet_csk_listen_stop+0x1bc/0x850 [ 291.053889][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 291.060132][ C1] __do_softirq+0x262/0x98c [ 291.064639][ C1] ? inet_csk_listen_stop+0x1bc/0x850 [ 291.070010][ C1] do_softirq_own_stack+0x2a/0x40 [ 291.075030][ C1] [ 291.077964][ C1] do_softirq.part.0+0x11a/0x170 [ 291.082899][ C1] __local_bh_enable_ip+0x211/0x270 [ 291.088095][ C1] inet_csk_listen_stop+0x1e0/0x850 [ 291.093301][ C1] tcp_close+0xd5b/0x10e0 [ 291.097632][ C1] ? ip_mc_drop_socket+0x211/0x270 [ 291.102737][ C1] ? down_write+0xdf/0x150 [ 291.107153][ C1] inet_release+0xed/0x200 [ 291.111580][ C1] inet6_release+0x53/0x80 [ 291.116015][ C1] __sock_release+0xce/0x280 [ 291.120604][ C1] sock_close+0x1e/0x30 [ 291.124758][ C1] __fput+0x2ff/0x890 [ 291.128740][ C1] ? __sock_release+0x280/0x280 [ 291.133595][ C1] ____fput+0x16/0x20 [ 291.137593][ C1] task_work_run+0x145/0x1c0 [ 291.142202][ C1] exit_to_usermode_loop+0x316/0x380 [ 291.147492][ C1] do_syscall_64+0x65f/0x760 [ 291.152081][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 291.157970][ C1] RIP: 0033:0x406581 [ 291.161873][ C1] 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 [ 291.181478][ C1] RSP: 002b:00007fff2ee4d560 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 291.189885][ C1] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406581 [ 291.197854][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 291.205816][ C1] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 291.213781][ C1] R10: 00007fff2ee4d590 R11: 0000000000000293 R12: 00007fff2ee4d5c0 [ 291.221746][ C1] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007 [ 291.249178][ T2886] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-... } 10567 jiffies s: 105 root: 0x2/. [ 291.261363][ T2886] rcu: blocking rcu_node structures: [ 291.266660][ T2886] Task dump for CPU 1: [ 291.271110][ T2886] syz-executor292 R running task 24184 10331 10330 0x8000000a [ 291.279807][ T2886] Call Trace: [ 291.283111][ T2886] ? __kasan_check_read+0x11/0x20 [ 291.288141][ T2886] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 291.294712][ T2886] ? lock_downgrade+0x920/0x920 [ 291.300295][ T2886] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 291.306545][ T2886] ? __this_cpu_preempt_check+0x3a/0x210 [ 291.312464][ T2886] ? inet_csk_listen_stop+0x1bc/0x850 [ 291.317844][ T2886] ? ksoftirqd_running+0x16/0x70 [ 291.323578][ T2886] ? inet_csk_listen_stop+0x1bc/0x850 [ 291.329216][ T2886] ? do_softirq.part.0+0x11a/0x170 [ 291.334334][ T2886] ? __local_bh_enable_ip+0x211/0x270 [ 291.340581][ T2886] ? inet_csk_listen_stop+0x1e0/0x850 [ 291.345971][ T2886] ? tcp_close+0xd5b/0x10e0 [ 291.350754][ T2886] ? ip_mc_drop_socket+0x211/0x270 [ 291.355920][ T2886] ? down_write+0xdf/0x150 [ 291.361160][ T2886] ? inet_release+0xed/0x200 [ 291.365769][ T2886] ? inet6_release+0x53/0x80 [ 291.370622][ T2886] ? __sock_release+0xce/0x280 [ 291.375395][ T2886] ? sock_close+0x1e/0x30 [ 291.380519][ T2886] ? __fput+0x2ff/0x890 [ 291.384688][ T2886] ? __sock_release+0x280/0x280 [ 291.389823][ T2886] ? ____fput+0x16/0x20 [ 291.394006][ T2886] ? task_work_run+0x145/0x1c0 [ 291.398778][ T2886] ? exit_to_usermode_loop+0x316/0x380 [ 291.405092][ T2886] ? do_syscall_64+0x65f/0x760 [ 291.410083][ T2886] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe