[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.525167][ T26] audit: type=1800 audit(1568595626.529:25): pid=8525 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.546758][ T26] audit: type=1800 audit(1568595626.529:26): pid=8525 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.579475][ T26] audit: type=1800 audit(1568595626.529:27): pid=8525 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 '10.128.15.197' (ECDSA) to the list of known hosts. syzkaller login: [ 324.260029][ T8679] IPVS: ftp: loaded support on port[0] = 21 [ 324.321284][ T8679] chnl_net:caif_netlink_parms(): no params data found [ 324.347111][ T8679] bridge0: port 1(bridge_slave_0) entered blocking state [ 324.355094][ T8679] bridge0: port 1(bridge_slave_0) entered disabled state [ 324.362943][ T8679] device bridge_slave_0 entered promiscuous mode [ 324.371400][ T8679] bridge0: port 2(bridge_slave_1) entered blocking state [ 324.378516][ T8679] bridge0: port 2(bridge_slave_1) entered disabled state [ 324.386538][ T8679] device bridge_slave_1 entered promiscuous mode [ 324.403703][ T8679] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 324.414541][ T8679] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 324.434513][ T8679] team0: Port device team_slave_0 added [ 324.441487][ T8679] team0: Port device team_slave_1 added [ 324.501046][ T8679] device hsr_slave_0 entered promiscuous mode [ 324.569666][ T8679] device hsr_slave_1 entered promiscuous mode [ 324.646729][ T8679] bridge0: port 2(bridge_slave_1) entered blocking state [ 324.653922][ T8679] bridge0: port 2(bridge_slave_1) entered forwarding state [ 324.661780][ T8679] bridge0: port 1(bridge_slave_0) entered blocking state [ 324.668817][ T8679] bridge0: port 1(bridge_slave_0) entered forwarding state [ 324.703351][ T8679] 8021q: adding VLAN 0 to HW filter on device bond0 [ 324.714242][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 324.734058][ T8681] bridge0: port 1(bridge_slave_0) entered disabled state [ 324.742164][ T8681] bridge0: port 2(bridge_slave_1) entered disabled state [ 324.750982][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 324.762564][ T8679] 8021q: adding VLAN 0 to HW filter on device team0 [ 324.772360][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 324.781150][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 324.788375][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 324.809747][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 324.818094][ T8681] bridge0: port 2(bridge_slave_1) entered blocking state [ 324.825184][ T8681] bridge0: port 2(bridge_slave_1) entered forwarding state [ 324.833144][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 324.842617][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 324.851049][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 324.860412][ T8681] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 324.871691][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 324.882726][ T8679] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 324.901049][ T8679] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 429.979085][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 429.985946][ C0] rcu: 0-...!: (1 GPs behind) idle=c7a/1/0x4000000000000002 softirq=9118/9119 fqs=19 [ 429.995691][ C0] (t=10501 jiffies g=7233 q=64) [ 430.000613][ C0] rcu: rcu_preempt kthread starved for 10464 jiffies! g7233 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 430.011687][ C0] rcu: RCU grace-period kthread stack dump: [ 430.017561][ C0] rcu_preempt R running task 29360 10 2 0x80004000 [ 430.025439][ C0] Call Trace: [ 430.028799][ C0] __schedule+0x76e/0x17a0 [ 430.033203][ C0] ? __sched_text_start+0x8/0x8 [ 430.038034][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 430.043817][ C0] ? schedule_timeout+0x47c/0xc50 [ 430.048821][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 430.054091][ C0] schedule+0xd9/0x260 [ 430.058142][ C0] schedule_timeout+0x486/0xc50 [ 430.063007][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 430.068795][ C0] ? usleep_range+0x170/0x170 [ 430.073540][ C0] ? trace_hardirqs_on+0x67/0x240 [ 430.078555][ C0] ? __kasan_check_read+0x11/0x20 [ 430.083565][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 430.089097][ C0] ? swake_up_one+0x60/0x60 [ 430.093583][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 430.098328][ C0] ? invoke_rcu_core+0x230/0x230 [ 430.103247][ C0] ? trace_hardirqs_on+0x67/0x240 [ 430.108257][ C0] ? __kasan_check_read+0x11/0x20 [ 430.113266][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 430.119487][ C0] ? __kthread_parkme+0x108/0x1c0 [ 430.124488][ C0] ? __kasan_check_read+0x11/0x20 [ 430.129495][ C0] kthread+0x361/0x430 [ 430.133564][ C0] ? invoke_rcu_core+0x230/0x230 [ 430.138482][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 430.144713][ C0] ret_from_fork+0x24/0x30 [ 430.149135][ C0] NMI backtrace for cpu 0 [ 430.153450][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc6-next-20190830 #75 [ 430.161928][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 430.171966][ C0] Call Trace: [ 430.175230][ C0] [ 430.178120][ C0] dump_stack+0x172/0x1f0 [ 430.182434][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 430.187613][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.193835][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 430.199452][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 430.205413][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 430.211282][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 430.216375][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 430.221901][ C0] ? raise_softirq+0x138/0x340 [ 430.226780][ C0] update_process_times+0x2d/0x70 [ 430.231791][ C0] tick_sched_handle+0xa2/0x190 [ 430.236624][ C0] tick_sched_timer+0x53/0x140 [ 430.241370][ C0] __hrtimer_run_queues+0x364/0xe40 [ 430.246640][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 430.251910][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 430.257874][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 430.263582][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 430.269646][ C0] hrtimer_interrupt+0x314/0x770 [ 430.274575][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 430.280104][ C0] apic_timer_interrupt+0xf/0x20 [ 430.285016][ C0] [ 430.287991][ C0] RIP: 0010:hhf_dequeue+0x615/0xa20 [ 430.293177][ C0] Code: 00 00 48 8d 7b 08 4c 8b 3b 48 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 d0 03 00 00 49 8d 7f 08 4c 8b 73 08 48 89 fa 48 c1 ea 03 <42> 80 3c 22 00 0f 85 ac 03 00 00 4c 89 f2 4d 89 77 08 48 c1 ea 03 [ 430.312767][ C0] RSP: 0018:ffff8880a98ae9a8 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 [ 430.321162][ C0] RAX: 1ffff1101427e75f RBX: ffff8880a13f3af8 RCX: ffffffff85cb6ed1 [ 430.329123][ C0] RDX: 1ffff1101427e773 RSI: ffffffff85cb6edb RDI: ffff8880a13f3b98 [ 430.337081][ C0] RBP: ffff8880a98ae9f8 R08: ffff8880a989c240 R09: fffffbfff14ed341 [ 430.345040][ C0] R10: ffff8880a989cba8 R11: ffff8880a989c240 R12: dffffc0000000000 [ 430.353072][ C0] R13: ffff8880a13f3800 R14: ffff8880a13f3b90 R15: ffff8880a13f3b90 [ 430.361038][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 430.365645][ C0] ? hhf_dequeue+0x5db/0xa20 [ 430.370217][ C0] ? hhf_dequeue+0x5db/0xa20 [ 430.374838][ C0] __qdisc_run+0x1e7/0x19d0 [ 430.379336][ C0] ? dev_queue_xmit+0x18/0x20 [ 430.384027][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 430.389041][ C0] ? process_backlog+0x206/0x750 [ 430.393978][ C0] ? net_rx_action+0x50a/0x10d0 [ 430.398825][ C0] ? __do_softirq+0x262/0x98c [ 430.403486][ C0] ? run_ksoftirqd+0x8e/0x110 [ 430.408143][ C0] ? smpboot_thread_fn+0x6a3/0xa40 [ 430.413245][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 430.418520][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.424748][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.430884][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 430.435894][ C0] dev_queue_xmit+0x18/0x20 [ 430.440381][ C0] ? dev_queue_xmit+0x18/0x20 [ 430.445124][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 430.450494][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 430.455170][ C0] ? lock_downgrade+0x920/0x920 [ 430.460041][ C0] br_nf_dev_queue_xmit+0x34e/0x14b0 [ 430.465312][ C0] br_nf_post_routing+0x1502/0x1d30 [ 430.470493][ C0] ? br_nf_dev_queue_xmit+0x14b0/0x14b0 [ 430.476045][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 430.481849][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.488040][ C0] nf_hook_slow+0xbc/0x1e0 [ 430.492442][ C0] br_forward_finish+0x215/0x400 [ 430.497361][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 430.502889][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.509026][ C0] ? br_fdb_add.cold+0x83/0x83 [ 430.513779][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 430.519477][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 430.524063][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 430.528981][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 430.534508][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 430.539606][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 430.545132][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.551353][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 430.557238][ C0] br_nf_forward_finish+0x66c/0xa90 [ 430.562416][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 430.567964][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 430.572893][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 430.578168][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 430.583260][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.589407][ C0] nf_hook_slow+0xbc/0x1e0 [ 430.593807][ C0] __br_forward+0x393/0xb00 [ 430.598292][ C0] ? br_forward_finish+0x400/0x400 [ 430.603389][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 430.608919][ C0] deliver_clone+0x61/0xc0 [ 430.613320][ C0] br_flood+0x325/0x3d0 [ 430.617463][ C0] br_handle_frame_finish+0xb46/0x1670 [ 430.622904][ C0] ? br_handle_local_finish+0x20/0x20 [ 430.628255][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.634389][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 430.639395][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 430.645093][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 430.649673][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 430.654591][ C0] ? br_handle_local_finish+0x20/0x20 [ 430.659944][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 430.665035][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.671178][ C0] ? br_handle_local_finish+0x20/0x20 [ 430.676527][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 430.681533][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 430.687320][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 430.693191][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 430.699082][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 430.705049][ C0] ? br_handle_local_finish+0x20/0x20 [ 430.710400][ C0] ? __kasan_check_read+0x11/0x20 [ 430.715410][ C0] br_nf_pre_routing_ipv6+0x456/0x840 [ 430.720764][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 430.725772][ C0] ? br_nf_pre_routing+0x2360/0x2360 [ 430.731035][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.737258][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 430.743475][ C0] ? skb_pull_rcsum+0x155/0x300 [ 430.748396][ C0] br_nf_pre_routing+0x1743/0x2360 [ 430.753492][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 430.759377][ C0] ? br_nf_pre_routing_finish+0x17a0/0x17a0 [ 430.765254][ C0] br_handle_frame+0x806/0x1340 [ 430.770086][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 430.775793][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 430.781930][ C0] ? br_handle_local_finish+0x20/0x20 [ 430.787282][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 430.793069][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.799287][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 430.804990][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 430.810606][ C0] ? __kasan_check_read+0x11/0x20 [ 430.815612][ C0] ? do_xdp_generic+0x50/0x50 [ 430.820280][ C0] ? __kasan_check_read+0x11/0x20 [ 430.825284][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 430.830208][ C0] ? cpuacct_charge+0x1db/0x360 [ 430.835039][ C0] ? find_held_lock+0x35/0x130 [ 430.839794][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 430.845579][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 430.851538][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 430.857411][ C0] ? lock_acquire+0x190/0x410 [ 430.862070][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.868290][ C0] __netif_receive_skb+0x2c/0x1d0 [ 430.873298][ C0] process_backlog+0x206/0x750 [ 430.878145][ C0] ? net_rx_action+0x27d/0x10d0 [ 430.882984][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 430.888265][ C0] net_rx_action+0x50a/0x10d0 [ 430.892931][ C0] ? napi_busy_loop+0x970/0x970 [ 430.897763][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 430.903299][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 430.909269][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 430.915494][ C0] __do_softirq+0x262/0x98c [ 430.919983][ C0] ? takeover_tasklets+0x820/0x820 [ 430.925071][ C0] run_ksoftirqd+0x8e/0x110 [ 430.929556][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 430.934478][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 430.940706][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 430.946927][ C0] ? __kthread_parkme+0x108/0x1c0 [ 430.951932][ C0] ? __kasan_check_read+0x11/0x20 [ 430.956938][ C0] kthread+0x361/0x430 [ 430.960989][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 430.967212][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 430.973435][ C0] ret_from_fork+0x24/0x30