[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.164598][ T26] audit: type=1800 audit(1568422691.818:25): pid=8523 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.186138][ T26] audit: type=1800 audit(1568422691.818:26): pid=8523 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.207349][ T26] audit: type=1800 audit(1568422691.818:27): pid=8523 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 '10.128.0.57' (ECDSA) to the list of known hosts. syzkaller login: [ 237.952338][ T8676] IPVS: ftp: loaded support on port[0] = 21 [ 238.013223][ T8676] chnl_net:caif_netlink_parms(): no params data found [ 238.041171][ T8676] bridge0: port 1(bridge_slave_0) entered blocking state [ 238.048834][ T8676] bridge0: port 1(bridge_slave_0) entered disabled state [ 238.056750][ T8676] device bridge_slave_0 entered promiscuous mode [ 238.064606][ T8676] bridge0: port 2(bridge_slave_1) entered blocking state [ 238.071789][ T8676] bridge0: port 2(bridge_slave_1) entered disabled state [ 238.079418][ T8676] device bridge_slave_1 entered promiscuous mode [ 238.095183][ T8676] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 238.105913][ T8676] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 238.124424][ T8676] team0: Port device team_slave_0 added [ 238.131761][ T8676] team0: Port device team_slave_1 added [ 238.207623][ T8676] device hsr_slave_0 entered promiscuous mode [ 238.245540][ T8676] device hsr_slave_1 entered promiscuous mode [ 238.302586][ T8676] bridge0: port 2(bridge_slave_1) entered blocking state [ 238.309736][ T8676] bridge0: port 2(bridge_slave_1) entered forwarding state [ 238.317594][ T8676] bridge0: port 1(bridge_slave_0) entered blocking state [ 238.324633][ T8676] bridge0: port 1(bridge_slave_0) entered forwarding state [ 238.358204][ T8676] 8021q: adding VLAN 0 to HW filter on device bond0 [ 238.369611][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 238.380369][ T8678] bridge0: port 1(bridge_slave_0) entered disabled state [ 238.388697][ T8678] bridge0: port 2(bridge_slave_1) entered disabled state [ 238.396727][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 238.409312][ T8676] 8021q: adding VLAN 0 to HW filter on device team0 [ 238.419566][ T2993] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 238.428344][ T2993] bridge0: port 1(bridge_slave_0) entered blocking state [ 238.435459][ T2993] bridge0: port 1(bridge_slave_0) entered forwarding state [ 238.456378][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 238.464757][ T8678] bridge0: port 2(bridge_slave_1) entered blocking state [ 238.472158][ T8678] bridge0: port 2(bridge_slave_1) entered forwarding state [ 238.480254][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 238.489430][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 238.498675][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 238.507247][ T8678] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 238.518403][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 238.529519][ T8676] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 238.549047][ T8676] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 343.715105][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 343.721821][ C1] rcu: 1-...!: (10500 ticks this GP) idle=8ba/1/0x4000000000000002 softirq=8865/8865 fqs=0 [ 343.732146][ C1] (t=10500 jiffies g=7065 q=13) [ 343.737082][ C1] rcu: rcu_preempt kthread starved for 10500 jiffies! g7065 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 343.749472][ C1] rcu: RCU grace-period kthread stack dump: [ 343.755357][ C1] rcu_preempt I29032 10 2 0x80004000 [ 343.761681][ C1] Call Trace: [ 343.765308][ C1] __schedule+0x76e/0x17a0 [ 343.769721][ C1] ? __sched_text_start+0x8/0x8 [ 343.774562][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 343.780434][ C1] ? schedule_timeout+0x47c/0xc50 [ 343.785439][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 343.790766][ C1] schedule+0xd9/0x260 [ 343.794849][ C1] schedule_timeout+0x486/0xc50 [ 343.799696][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 343.807225][ C1] ? usleep_range+0x170/0x170 [ 343.811968][ C1] ? trace_hardirqs_on+0x67/0x240 [ 343.816975][ C1] ? __kasan_check_read+0x11/0x20 [ 343.821997][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 343.828058][ C1] ? swake_up_one+0x60/0x60 [ 343.832545][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 343.837302][ C1] ? invoke_rcu_core+0x230/0x230 [ 343.842405][ C1] ? trace_hardirqs_on+0x67/0x240 [ 343.847423][ C1] ? __kasan_check_read+0x11/0x20 [ 343.852450][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 343.858827][ C1] ? __kthread_parkme+0x108/0x1c0 [ 343.863863][ C1] ? __kasan_check_read+0x11/0x20 [ 343.870706][ C1] kthread+0x361/0x430 [ 343.874760][ C1] ? invoke_rcu_core+0x230/0x230 [ 343.879854][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 343.886079][ C1] ret_from_fork+0x24/0x30 [ 343.890522][ C1] NMI backtrace for cpu 1 [ 343.894836][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc6-next-20190830 #75 [ 343.903397][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 343.913437][ C1] Call Trace: [ 343.916700][ C1] [ 343.919605][ C1] dump_stack+0x172/0x1f0 [ 343.923934][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 343.929117][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 343.935341][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 343.940966][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 343.946928][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 343.952803][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 343.957900][ C1] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 343.963430][ C1] ? raise_softirq+0x138/0x340 [ 343.968176][ C1] update_process_times+0x2d/0x70 [ 343.973183][ C1] tick_sched_handle+0xa2/0x190 [ 343.978014][ C1] tick_sched_timer+0x53/0x140 [ 343.982759][ C1] __hrtimer_run_queues+0x364/0xe40 [ 343.987939][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 343.993206][ C1] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 343.999179][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 344.004878][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 344.010929][ C1] hrtimer_interrupt+0x314/0x770 [ 344.015855][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 344.021380][ C1] apic_timer_interrupt+0xf/0x20 [ 344.026293][ C1] [ 344.029239][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 [ 344.035289][ C1] Code: 3b 09 41 bc f4 ff ff ff e8 1d 8f e9 ff 48 c7 05 1e 8c 3b 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 <65> 48 8b 04 25 40 fe 01 00 65 8b 15 e4 a7 8f 7e 81 e2 00 01 1f 00 [ 344.054870][ C1] RSP: 0018:ffff8880a9906998 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 344.063261][ C1] RAX: 0000000000000301 RBX: ffff888097c2e2f8 RCX: ffffffff85cb6f79 [ 344.071222][ C1] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 [ 344.079184][ C1] RBP: ffff8880a9906998 R08: ffff8880a98f2440 R09: fffffbfff14ed341 [ 344.087148][ C1] R10: ffff8880a98f2da8 R11: ffff8880a98f2440 R12: dffffc0000000000 [ 344.095101][ C1] R13: ffff888097c2e000 R14: ffff888097c2e398 R15: ffff888097c2e390 [ 344.103125][ C1] ? hhf_dequeue+0x679/0xa20 [ 344.107715][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 344.113934][ C1] hhf_dequeue+0x68b/0xa20 [ 344.118393][ C1] __qdisc_run+0x1e7/0x19d0 [ 344.122898][ C1] ? dev_queue_xmit+0x18/0x20 [ 344.127574][ C1] __dev_queue_xmit+0x16f1/0x37c0 [ 344.132580][ C1] ? process_backlog+0x206/0x750 [ 344.137512][ C1] ? net_rx_action+0x50a/0x10d0 [ 344.142342][ C1] ? __do_softirq+0x262/0x98c [ 344.146998][ C1] ? run_ksoftirqd+0x8e/0x110 [ 344.151652][ C1] ? smpboot_thread_fn+0x6a3/0xa40 [ 344.156747][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 344.162025][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.168275][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.174412][ C1] ? rcu_read_lock_held+0x9c/0xb0 [ 344.179418][ C1] dev_queue_xmit+0x18/0x20 [ 344.183909][ C1] ? dev_queue_xmit+0x18/0x20 [ 344.188633][ C1] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 344.194036][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 344.198694][ C1] ? lock_downgrade+0x920/0x920 [ 344.203579][ C1] br_nf_dev_queue_xmit+0x34e/0x14b0 [ 344.208853][ C1] br_nf_post_routing+0x1502/0x1d30 [ 344.214044][ C1] ? br_nf_dev_queue_xmit+0x14b0/0x14b0 [ 344.219575][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 344.225369][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.231570][ C1] nf_hook_slow+0xbc/0x1e0 [ 344.235974][ C1] br_forward_finish+0x215/0x400 [ 344.240895][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 344.246435][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.252578][ C1] ? br_fdb_add.cold+0x83/0x83 [ 344.257328][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 344.263029][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 344.267605][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 344.272526][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 344.278053][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 344.283163][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 344.288687][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.294919][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 344.300795][ C1] br_nf_forward_finish+0x66c/0xa90 [ 344.305981][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 344.311511][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 344.316432][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 344.321711][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 344.326832][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.332971][ C1] nf_hook_slow+0xbc/0x1e0 [ 344.337380][ C1] __br_forward+0x393/0xb00 [ 344.341868][ C1] ? br_forward_finish+0x400/0x400 [ 344.346973][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 344.352505][ C1] deliver_clone+0x61/0xc0 [ 344.356905][ C1] br_flood+0x325/0x3d0 [ 344.361049][ C1] br_handle_frame_finish+0xb46/0x1670 [ 344.366495][ C1] ? br_handle_local_finish+0x20/0x20 [ 344.371849][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.377985][ C1] ? rcu_read_lock_held+0x9c/0xb0 [ 344.383167][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 344.388873][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 344.393458][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 344.398376][ C1] ? br_handle_local_finish+0x20/0x20 [ 344.403739][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 344.408832][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.414966][ C1] ? br_handle_local_finish+0x20/0x20 [ 344.420323][ C1] ? rcu_read_lock_held+0x9c/0xb0 [ 344.425328][ C1] ? rcu_read_lock_held_common+0x130/0x130 [ 344.431636][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 344.438117][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 344.444600][ C1] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 344.450904][ C1] ? br_handle_local_finish+0x20/0x20 [ 344.456258][ C1] ? __kasan_check_read+0x11/0x20 [ 344.461265][ C1] br_nf_pre_routing_ipv6+0x456/0x840 [ 344.466618][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 344.471634][ C1] ? br_nf_pre_routing+0x2360/0x2360 [ 344.476902][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.483123][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 344.489341][ C1] ? skb_pull_rcsum+0x155/0x300 [ 344.494177][ C1] br_nf_pre_routing+0x1743/0x2360 [ 344.499282][ C1] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 344.505167][ C1] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 344.511040][ C1] br_handle_frame+0x806/0x1340 [ 344.515878][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 344.521588][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 344.527724][ C1] ? br_handle_local_finish+0x20/0x20 [ 344.533089][ C1] ? rcu_read_lock_held_common+0x130/0x130 [ 344.538877][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.545104][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 344.550901][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 344.556521][ C1] ? mark_lock+0xc2/0x1220 [ 344.560948][ C1] ? __kasan_check_read+0x11/0x20 [ 344.565983][ C1] ? do_xdp_generic+0x50/0x50 [ 344.570651][ C1] ? __kasan_check_read+0x11/0x20 [ 344.575658][ C1] ? __lock_acquire+0x8a0/0x4a00 [ 344.580580][ C1] ? update_load_avg+0xb08/0x1b10 [ 344.585596][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 344.591391][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 344.597353][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 344.603228][ C1] ? lock_acquire+0x190/0x410 [ 344.607893][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.614121][ C1] __netif_receive_skb+0x2c/0x1d0 [ 344.619131][ C1] process_backlog+0x206/0x750 [ 344.623873][ C1] ? net_rx_action+0x27d/0x10d0 [ 344.628708][ C1] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 344.633978][ C1] net_rx_action+0x50a/0x10d0 [ 344.638641][ C1] ? napi_busy_loop+0x970/0x970 [ 344.643480][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 344.649016][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 344.654977][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 344.661200][ C1] __do_softirq+0x262/0x98c [ 344.665709][ C1] ? takeover_tasklets+0x820/0x820 [ 344.670803][ C1] run_ksoftirqd+0x8e/0x110 [ 344.675285][ C1] smpboot_thread_fn+0x6a3/0xa40 [ 344.680210][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 344.686436][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 344.692811][ C1] ? __kthread_parkme+0x108/0x1c0 [ 344.697835][ C1] ? __kasan_check_read+0x11/0x20 [ 344.702851][ C1] kthread+0x361/0x430 [ 344.706908][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 344.713129][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 344.719353][ C1] ret_from_fork+0x24/0x30