[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.042214][ T26] audit: type=1800 audit(1568390407.746:25): pid=8491 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.083635][ T26] audit: type=1800 audit(1568390407.746:26): pid=8491 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.117716][ T26] audit: type=1800 audit(1568390407.746:27): pid=8491 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.196' (ECDSA) to the list of known hosts. syzkaller login: [ 364.353842][ T8644] IPVS: ftp: loaded support on port[0] = 21 [ 364.413776][ T8644] chnl_net:caif_netlink_parms(): no params data found [ 364.440259][ T8644] bridge0: port 1(bridge_slave_0) entered blocking state [ 364.447715][ T8644] bridge0: port 1(bridge_slave_0) entered disabled state [ 364.455468][ T8644] device bridge_slave_0 entered promiscuous mode [ 364.463038][ T8644] bridge0: port 2(bridge_slave_1) entered blocking state [ 364.470269][ T8644] bridge0: port 2(bridge_slave_1) entered disabled state [ 364.477876][ T8644] device bridge_slave_1 entered promiscuous mode [ 364.492896][ T8644] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 364.504535][ T8644] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 364.522176][ T8644] team0: Port device team_slave_0 added [ 364.530319][ T8644] team0: Port device team_slave_1 added [ 364.585349][ T8644] device hsr_slave_0 entered promiscuous mode [ 364.633746][ T8644] device hsr_slave_1 entered promiscuous mode [ 364.690685][ T8644] bridge0: port 2(bridge_slave_1) entered blocking state [ 364.697917][ T8644] bridge0: port 2(bridge_slave_1) entered forwarding state [ 364.705656][ T8644] bridge0: port 1(bridge_slave_0) entered blocking state [ 364.712729][ T8644] bridge0: port 1(bridge_slave_0) entered forwarding state [ 364.744186][ T8644] 8021q: adding VLAN 0 to HW filter on device bond0 [ 364.756866][ T2408] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 364.777062][ T2408] bridge0: port 1(bridge_slave_0) entered disabled state [ 364.785348][ T2408] bridge0: port 2(bridge_slave_1) entered disabled state [ 364.793105][ T2408] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 364.804919][ T8644] 8021q: adding VLAN 0 to HW filter on device team0 [ 364.815092][ T8647] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 364.823608][ T8647] bridge0: port 1(bridge_slave_0) entered blocking state [ 364.830648][ T8647] bridge0: port 1(bridge_slave_0) entered forwarding state [ 364.840946][ T2408] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 364.850003][ T2408] bridge0: port 2(bridge_slave_1) entered blocking state [ 364.857125][ T2408] bridge0: port 2(bridge_slave_1) entered forwarding state [ 364.875977][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 364.884796][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 364.893019][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 364.902124][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 364.912373][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 364.922748][ T8644] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 364.939570][ T8644] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 469.983302][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 469.990094][ C0] rcu: 0-...!: (1 GPs behind) idle=7ae/1/0x4000000000000002 softirq=8835/8836 fqs=11 [ 469.999844][ C0] (t=10500 jiffies g=7041 q=66) [ 470.004765][ C0] rcu: rcu_preempt kthread starved for 10478 jiffies! g7041 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 470.015839][ C0] rcu: RCU grace-period kthread stack dump: [ 470.021705][ C0] rcu_preempt R running task 29552 10 2 0x80004000 [ 470.029583][ C0] Call Trace: [ 470.032927][ C0] __schedule+0x76e/0x17a0 [ 470.037332][ C0] ? __sched_text_start+0x8/0x8 [ 470.042167][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 470.047950][ C0] ? schedule_timeout+0x47c/0xc50 [ 470.052958][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 470.058224][ C0] schedule+0xd9/0x260 [ 470.062276][ C0] schedule_timeout+0x486/0xc50 [ 470.067108][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 470.072896][ C0] ? usleep_range+0x170/0x170 [ 470.077555][ C0] ? trace_hardirqs_on+0x67/0x240 [ 470.082562][ C0] ? __kasan_check_read+0x11/0x20 [ 470.091564][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 470.097094][ C0] ? swake_up_one+0x60/0x60 [ 470.101592][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 470.106340][ C0] ? invoke_rcu_core+0x230/0x230 [ 470.111390][ C0] ? trace_hardirqs_on+0x67/0x240 [ 470.116407][ C0] ? __kasan_check_read+0x11/0x20 [ 470.121425][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 470.127651][ C0] ? __kthread_parkme+0x108/0x1c0 [ 470.132665][ C0] ? __kasan_check_read+0x11/0x20 [ 470.137689][ C0] kthread+0x361/0x430 [ 470.141741][ C0] ? invoke_rcu_core+0x230/0x230 [ 470.146663][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 470.152894][ C0] ret_from_fork+0x24/0x30 [ 470.157311][ C0] NMI backtrace for cpu 0 [ 470.161625][ C0] CPU: 0 PID: 2808 Comm: kworker/0:2 Not tainted 5.3.0-rc6-next-20190830 #75 [ 470.170356][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 470.180473][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 470.186430][ C0] Call Trace: [ 470.189692][ C0] [ 470.192550][ C0] dump_stack+0x172/0x1f0 [ 470.196867][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 470.202045][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.208269][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 470.213883][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 470.219847][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 470.225718][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 470.230814][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 470.236348][ C0] ? raise_softirq+0x138/0x340 [ 470.241096][ C0] update_process_times+0x2d/0x70 [ 470.246104][ C0] tick_sched_handle+0xa2/0x190 [ 470.250935][ C0] tick_sched_timer+0x53/0x140 [ 470.255685][ C0] __hrtimer_run_queues+0x364/0xe40 [ 470.260868][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 470.266139][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 470.272097][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 470.277796][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 470.283851][ C0] hrtimer_interrupt+0x314/0x770 [ 470.288790][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 470.294330][ C0] apic_timer_interrupt+0xf/0x20 [ 470.299249][ C0] RIP: 0010:__list_del_entry_valid+0x85/0xf5 [ 470.305211][ C0] Code: 0f 84 e1 00 00 00 48 b8 22 01 00 00 00 00 ad de 49 39 c4 0f 84 e2 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 53 49 8b 14 24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d [ 470.324798][ C0] RSP: 0018:ffff8880ae808b20 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 [ 470.333188][ C0] RAX: dffffc0000000000 RBX: ffff88809b3c6af8 RCX: ffffffff85cb69b9 [ 470.341142][ C0] RDX: 1ffff11013678d72 RSI: ffffffff85cb6e86 RDI: ffff88809b3c6b00 [ 470.349094][ C0] RBP: ffff8880ae808b38 R08: ffff8880a05d2240 R09: fffffbfff14ed341 [ 470.357043][ C0] R10: ffff8880a05d2c48 R11: ffff8880a05d2240 R12: ffff88809b3c6b90 [ 470.364994][ C0] R13: ffff88809b3c6b90 R14: ffff88809b3c6af8 R15: 0000000000000000 [ 470.372950][ C0] ? apic_timer_interrupt+0xa/0x20 [ 470.378079][ C0] ? hhf_dequeue+0xb9/0xa20 [ 470.382562][ C0] ? hhf_dequeue+0x586/0xa20 [ 470.387137][ C0] hhf_dequeue+0x5c5/0xa20 [ 470.391571][ C0] __qdisc_run+0x1e7/0x19d0 [ 470.396063][ C0] ? dev_queue_xmit+0x18/0x20 [ 470.400729][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 470.405733][ C0] ? process_backlog+0x206/0x750 [ 470.410653][ C0] ? net_rx_action+0x50a/0x10d0 [ 470.415481][ C0] ? __do_softirq+0x262/0x98c [ 470.420137][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 470.425317][ C0] ? do_softirq.part.0+0x11a/0x170 [ 470.430425][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 470.435698][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.441922][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.448057][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 470.453078][ C0] dev_queue_xmit+0x18/0x20 [ 470.457562][ C0] ? dev_queue_xmit+0x18/0x20 [ 470.462263][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 470.467639][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 470.472301][ C0] ? lock_downgrade+0x920/0x920 [ 470.477175][ C0] br_nf_dev_queue_xmit+0x34e/0x14b0 [ 470.482543][ C0] br_nf_post_routing+0x1502/0x1d30 [ 470.487727][ C0] ? br_nf_dev_queue_xmit+0x14b0/0x14b0 [ 470.493277][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 470.499085][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.505286][ C0] nf_hook_slow+0xbc/0x1e0 [ 470.509695][ C0] br_forward_finish+0x215/0x400 [ 470.514621][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 470.520166][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.526309][ C0] ? br_fdb_add.cold+0x83/0x83 [ 470.531059][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 470.536759][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 470.541339][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 470.546268][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 470.551812][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 470.556924][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 470.562455][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.568682][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 470.574570][ C0] br_nf_forward_finish+0x66c/0xa90 [ 470.579758][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 470.585306][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 470.590229][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 470.595501][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 470.600597][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.606735][ C0] nf_hook_slow+0xbc/0x1e0 [ 470.611141][ C0] __br_forward+0x393/0xb00 [ 470.615627][ C0] ? br_forward_finish+0x400/0x400 [ 470.620723][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 470.626253][ C0] deliver_clone+0x61/0xc0 [ 470.630653][ C0] br_flood+0x325/0x3d0 [ 470.634794][ C0] br_handle_frame_finish+0xb46/0x1670 [ 470.640238][ C0] ? br_handle_local_finish+0x20/0x20 [ 470.645605][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.651741][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 470.656755][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 470.662464][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 470.667038][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 470.671958][ C0] ? br_handle_local_finish+0x20/0x20 [ 470.677314][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 470.682425][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.688564][ C0] ? br_handle_local_finish+0x20/0x20 [ 470.693917][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 470.698929][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 470.704732][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 470.710613][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 470.716492][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 470.722453][ C0] ? br_handle_local_finish+0x20/0x20 [ 470.727810][ C0] ? __kasan_check_read+0x11/0x20 [ 470.732820][ C0] br_nf_pre_routing_ipv6+0x456/0x840 [ 470.738262][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 470.743276][ C0] ? br_nf_pre_routing+0x2360/0x2360 [ 470.748545][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.754765][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 470.760985][ C0] ? skb_pull_rcsum+0x155/0x300 [ 470.765821][ C0] br_nf_pre_routing+0x1743/0x2360 [ 470.770918][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 470.776910][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 470.782781][ C0] br_handle_frame+0x806/0x1340 [ 470.787617][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 470.793321][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 470.799457][ C0] ? br_handle_local_finish+0x20/0x20 [ 470.804809][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 470.810599][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.816820][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 470.822521][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 470.828143][ C0] ? __kasan_check_read+0x11/0x20 [ 470.833150][ C0] ? do_xdp_generic+0x50/0x50 [ 470.837809][ C0] ? __kasan_check_read+0x11/0x20 [ 470.842824][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 470.847743][ C0] ? swake_up_one+0x4d/0x60 [ 470.852237][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 470.858020][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 470.863981][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 470.869854][ C0] ? lock_acquire+0x190/0x410 [ 470.874511][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.880732][ C0] __netif_receive_skb+0x2c/0x1d0 [ 470.885739][ C0] process_backlog+0x206/0x750 [ 470.890480][ C0] ? net_rx_action+0x27d/0x10d0 [ 470.895311][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 470.900590][ C0] net_rx_action+0x50a/0x10d0 [ 470.905256][ C0] ? napi_busy_loop+0x970/0x970 [ 470.910090][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 470.915615][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 470.921573][ C0] ? ip6_finish_output2+0x106d/0x2550 [ 470.926927][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.933159][ C0] __do_softirq+0x262/0x98c [ 470.937648][ C0] ? ip6_finish_output2+0x106d/0x2550 [ 470.943001][ C0] do_softirq_own_stack+0x2a/0x40 [ 470.948001][ C0] [ 470.950924][ C0] do_softirq.part.0+0x11a/0x170 [ 470.955841][ C0] __local_bh_enable_ip+0x211/0x270 [ 470.961020][ C0] ip6_finish_output2+0x10a0/0x2550 [ 470.966202][ C0] ? ip6_forward_finish+0x570/0x570 [ 470.971386][ C0] ? lock_downgrade+0x920/0x920 [ 470.976231][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 470.982453][ C0] ? __kasan_check_read+0x11/0x20 [ 470.987463][ C0] __ip6_finish_output+0x444/0xaa0 [ 470.992551][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 470.997820][ C0] ip6_finish_output+0x38/0x1f0 [ 471.002650][ C0] ip6_output+0x235/0x7f0 [ 471.006961][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 471.012057][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 471.017379][ C0] ndisc_send_skb+0xf29/0x14a0 [ 471.022129][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 471.027421][ C0] ? skb_set_owner_w+0x21b/0x320 [ 471.032342][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 471.038043][ C0] ndisc_send_ns+0x3a9/0x850 [ 471.042615][ C0] ? mark_held_locks+0xa4/0xf0 [ 471.047359][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 471.052535][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 471.057811][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 471.062990][ C0] ? trace_hardirqs_on+0x67/0x240 [ 471.067995][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 471.073187][ C0] addrconf_dad_work+0xb88/0x1150 [ 471.078195][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 471.083723][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 471.089681][ C0] ? trace_hardirqs_on+0x67/0x240 [ 471.094693][ C0] process_one_work+0x9af/0x1740 [ 471.099608][ C0] ? __schedule+0x776/0x17a0 [ 471.104185][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 471.109546][ C0] ? lock_acquire+0x190/0x410 [ 471.114214][ C0] worker_thread+0x98/0xe40 [ 471.118698][ C0] ? trace_hardirqs_on+0x67/0x240 [ 471.123712][ C0] kthread+0x361/0x430 [ 471.127761][ C0] ? process_one_work+0x1740/0x1740 [ 471.132947][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 471.139168][ C0] ret_from_fork+0x24/0x30