[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.882686][ T26] audit: type=1800 audit(1568469764.870:25): pid=8541 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.927976][ T26] audit: type=1800 audit(1568469764.870:26): pid=8541 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.952793][ T26] audit: type=1800 audit(1568469764.870:27): pid=8541 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 '10.128.1.31' (ECDSA) to the list of known hosts. syzkaller login: [ 380.936812][ T8693] IPVS: ftp: loaded support on port[0] = 21 [ 380.997107][ T8693] chnl_net:caif_netlink_parms(): no params data found [ 381.024864][ T8693] bridge0: port 1(bridge_slave_0) entered blocking state [ 381.032383][ T8693] bridge0: port 1(bridge_slave_0) entered disabled state [ 381.040341][ T8693] device bridge_slave_0 entered promiscuous mode [ 381.048086][ T8693] bridge0: port 2(bridge_slave_1) entered blocking state [ 381.055285][ T8693] bridge0: port 2(bridge_slave_1) entered disabled state [ 381.062941][ T8693] device bridge_slave_1 entered promiscuous mode [ 381.079587][ T8693] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 381.090741][ T8693] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 381.108665][ T8693] team0: Port device team_slave_0 added [ 381.116754][ T8693] team0: Port device team_slave_1 added [ 381.191187][ T8693] device hsr_slave_0 entered promiscuous mode [ 381.229325][ T8693] device hsr_slave_1 entered promiscuous mode [ 381.276986][ T8693] bridge0: port 2(bridge_slave_1) entered blocking state [ 381.284406][ T8693] bridge0: port 2(bridge_slave_1) entered forwarding state [ 381.292295][ T8693] bridge0: port 1(bridge_slave_0) entered blocking state [ 381.299507][ T8693] bridge0: port 1(bridge_slave_0) entered forwarding state [ 381.332264][ T8693] 8021q: adding VLAN 0 to HW filter on device bond0 [ 381.343565][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 381.363629][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 381.382225][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 381.390696][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 381.403473][ T8693] 8021q: adding VLAN 0 to HW filter on device team0 [ 381.413418][ T8697] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 381.422567][ T8697] bridge0: port 1(bridge_slave_0) entered blocking state [ 381.429696][ T8697] bridge0: port 1(bridge_slave_0) entered forwarding state [ 381.440348][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 381.450035][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 381.457101][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 381.479861][ T8697] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 381.489292][ T8697] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 381.497777][ T8697] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 381.506334][ T8697] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 381.515201][ T8697] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 381.524241][ T8693] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 381.541072][ T8693] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 486.698759][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 486.705637][ C0] rcu: 0-...!: (10499 ticks this GP) idle=e16/1/0x4000000000000002 softirq=9418/9419 fqs=15 [ 486.716042][ C0] (t=10501 jiffies g=7125 q=10) [ 486.720964][ C0] rcu: rcu_preempt kthread starved for 10472 jiffies! g7125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 486.732222][ C0] rcu: RCU grace-period kthread stack dump: [ 486.738099][ C0] rcu_preempt I29440 10 2 0x80004000 [ 486.744422][ C0] Call Trace: [ 486.747865][ C0] __schedule+0x76e/0x17a0 [ 486.752273][ C0] ? __sched_text_start+0x8/0x8 [ 486.757117][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 486.762919][ C0] ? schedule_timeout+0x47c/0xc50 [ 486.767934][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 486.773222][ C0] schedule+0xd9/0x260 [ 486.777278][ C0] schedule_timeout+0x486/0xc50 [ 486.782130][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 486.787925][ C0] ? usleep_range+0x170/0x170 [ 486.792599][ C0] ? trace_hardirqs_on+0x67/0x240 [ 486.797619][ C0] ? __kasan_check_read+0x11/0x20 [ 486.802640][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 486.808183][ C0] ? swake_up_one+0x60/0x60 [ 486.812687][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 486.817441][ C0] ? invoke_rcu_core+0x230/0x230 [ 486.822363][ C0] ? trace_hardirqs_on+0x67/0x240 [ 486.827373][ C0] ? __kasan_check_read+0x11/0x20 [ 486.832410][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 486.838659][ C0] ? __kthread_parkme+0x108/0x1c0 [ 486.843670][ C0] ? __kasan_check_read+0x11/0x20 [ 486.848681][ C0] kthread+0x361/0x430 [ 486.852737][ C0] ? invoke_rcu_core+0x230/0x230 [ 486.857656][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 486.863888][ C0] ret_from_fork+0x24/0x30 [ 486.868333][ C0] NMI backtrace for cpu 0 [ 486.872649][ C0] CPU: 0 PID: 8697 Comm: kworker/0:2 Not tainted 5.3.0-rc6-next-20190830 #75 [ 486.881384][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 486.891662][ C0] Workqueue: events iterate_cleanup_work [ 486.897276][ C0] Call Trace: [ 486.900541][ C0] [ 486.903428][ C0] dump_stack+0x172/0x1f0 [ 486.907750][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 486.912949][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 486.919176][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 486.924794][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 486.930819][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 486.936719][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 486.941823][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 486.947363][ C0] ? raise_softirq+0x138/0x340 [ 486.952119][ C0] update_process_times+0x2d/0x70 [ 486.957214][ C0] tick_sched_handle+0xa2/0x190 [ 486.962059][ C0] tick_sched_timer+0x53/0x140 [ 486.966810][ C0] __hrtimer_run_queues+0x364/0xe40 [ 486.972009][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 486.977306][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 486.983288][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 486.988994][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 486.995047][ C0] hrtimer_interrupt+0x314/0x770 [ 486.999981][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 487.005513][ C0] apic_timer_interrupt+0xf/0x20 [ 487.010443][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 [ 487.016590][ C0] Code: 25 34 8c 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 [ 487.036290][ C0] RSP: 0018:ffff8880ae808b38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 487.044691][ C0] RAX: 0000000000000302 RBX: ffff88809fb9faf8 RCX: ffffffff85cb6ed1 [ 487.052656][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 487.060619][ C0] RBP: ffff8880ae808b98 R08: ffff8880a5406100 R09: fffffbfff14ed341 [ 487.068575][ C0] R10: ffff8880a5406ab8 R11: ffff8880a5406100 R12: dffffc0000000000 [ 487.076527][ C0] R13: ffff88809fb9f800 R14: 0000000000000001 R15: 0000000000000000 [ 487.084492][ C0] ? apic_timer_interrupt+0xa/0x20 [ 487.089653][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 487.094234][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 487.100458][ C0] ? hhf_dequeue+0x5db/0xa20 [ 487.105090][ C0] __qdisc_run+0x1e7/0x19d0 [ 487.109600][ C0] ? dev_queue_xmit+0x18/0x20 [ 487.114266][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 487.119281][ C0] ? process_backlog+0x206/0x750 [ 487.124209][ C0] ? net_rx_action+0x50a/0x10d0 [ 487.129040][ C0] ? __do_softirq+0x262/0x98c [ 487.133698][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 487.138880][ C0] ? do_softirq.part.0+0x11a/0x170 [ 487.143980][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 487.149272][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 487.155518][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.161666][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 487.166674][ C0] dev_queue_xmit+0x18/0x20 [ 487.171172][ C0] ? dev_queue_xmit+0x18/0x20 [ 487.175898][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 487.181285][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 487.185958][ C0] ? lock_downgrade+0x920/0x920 [ 487.190847][ C0] br_nf_dev_queue_xmit+0x34e/0x14b0 [ 487.196126][ C0] br_nf_post_routing+0x1502/0x1d30 [ 487.201322][ C0] ? br_nf_dev_queue_xmit+0x14b0/0x14b0 [ 487.206864][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 487.212665][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.218854][ C0] nf_hook_slow+0xbc/0x1e0 [ 487.223264][ C0] br_forward_finish+0x215/0x400 [ 487.228195][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 487.233738][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.239981][ C0] ? br_fdb_add.cold+0x83/0x83 [ 487.244760][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 487.250477][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 487.255060][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 487.259997][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 487.265527][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 487.270637][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 487.276168][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 487.282407][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 487.288303][ C0] br_nf_forward_finish+0x66c/0xa90 [ 487.293489][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 487.299022][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 487.303949][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 487.309232][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 487.314330][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.320472][ C0] nf_hook_slow+0xbc/0x1e0 [ 487.324876][ C0] __br_forward+0x393/0xb00 [ 487.329365][ C0] ? br_forward_finish+0x400/0x400 [ 487.334462][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 487.339994][ C0] deliver_clone+0x61/0xc0 [ 487.344394][ C0] br_flood+0x325/0x3d0 [ 487.348541][ C0] br_handle_frame_finish+0xb46/0x1670 [ 487.354073][ C0] ? br_handle_local_finish+0x20/0x20 [ 487.359429][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.365831][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 487.370843][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 487.376543][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 487.381122][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 487.386045][ C0] ? br_handle_local_finish+0x20/0x20 [ 487.391402][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 487.396517][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.402680][ C0] ? br_handle_local_finish+0x20/0x20 [ 487.408059][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 487.413070][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 487.418859][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 487.424757][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 487.430668][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 487.436641][ C0] ? br_handle_local_finish+0x20/0x20 [ 487.441999][ C0] ? __kasan_check_read+0x11/0x20 [ 487.447012][ C0] br_nf_pre_routing_ipv6+0x456/0x840 [ 487.452372][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 487.457386][ C0] ? br_nf_pre_routing+0x2360/0x2360 [ 487.462655][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 487.468881][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 487.475109][ C0] ? skb_pull_rcsum+0x155/0x300 [ 487.479950][ C0] br_nf_pre_routing+0x1743/0x2360 [ 487.485051][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 487.490942][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 487.496819][ C0] br_handle_frame+0x806/0x1340 [ 487.501656][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 487.507359][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 487.513499][ C0] ? br_handle_local_finish+0x20/0x20 [ 487.518867][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 487.524661][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 487.530927][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 487.536633][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 487.542255][ C0] ? __kasan_check_read+0x11/0x20 [ 487.547265][ C0] ? do_xdp_generic+0x50/0x50 [ 487.551938][ C0] ? __kasan_check_read+0x11/0x20 [ 487.556962][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 487.561901][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 487.567693][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 487.573657][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 487.579535][ C0] ? lock_acquire+0x190/0x410 [ 487.584197][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 487.590441][ C0] __netif_receive_skb+0x2c/0x1d0 [ 487.595625][ C0] process_backlog+0x206/0x750 [ 487.600374][ C0] ? net_rx_action+0x27d/0x10d0 [ 487.605209][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 487.610482][ C0] net_rx_action+0x50a/0x10d0 [ 487.615150][ C0] ? napi_busy_loop+0x970/0x970 [ 487.619985][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 487.625530][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 487.631842][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 487.638070][ C0] __do_softirq+0x262/0x98c [ 487.642563][ C0] ? nf_ct_iterate_cleanup+0x1f1/0x4e0 [ 487.648005][ C0] do_softirq_own_stack+0x2a/0x40 [ 487.653008][ C0] [ 487.655935][ C0] do_softirq.part.0+0x11a/0x170 [ 487.660859][ C0] __local_bh_enable_ip+0x211/0x270 [ 487.666051][ C0] nf_ct_iterate_cleanup+0x217/0x4e0 [ 487.671322][ C0] ? nf_ct_alloc_hashtable+0x150/0x150 [ 487.676782][ C0] nf_ct_iterate_cleanup_net+0x133/0x190 [ 487.682456][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 487.689647][ C0] ? nf_ct_iterate_cleanup+0x4e0/0x4e0 [ 487.695093][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 487.702280][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 487.707809][ C0] iterate_cleanup_work+0x4a/0xd7 [ 487.712823][ C0] process_one_work+0x9af/0x1740 [ 487.717756][ C0] ? __schedule+0x776/0x17a0 [ 487.722337][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 487.727693][ C0] ? lock_acquire+0x190/0x410 [ 487.732363][ C0] worker_thread+0x98/0xe40 [ 487.736859][ C0] ? trace_hardirqs_on+0x67/0x240 [ 487.741934][ C0] kthread+0x361/0x430 [ 487.745990][ C0] ? process_one_work+0x1740/0x1740 [ 487.751170][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 487.757395][ C0] ret_from_fork+0x24/0x30