[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.846009][ T26] audit: type=1800 audit(1568307898.709:25): pid=8488 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 52.867716][ T26] audit: type=1800 audit(1568307898.719:26): pid=8488 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 52.889815][ T26] audit: type=1800 audit(1568307898.719:27): pid=8488 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 '10.128.0.71' (ECDSA) to the list of known hosts. syzkaller login: [ 62.065534][ T8642] IPVS: ftp: loaded support on port[0] = 21 [ 62.118045][ T8642] chnl_net:caif_netlink_parms(): no params data found [ 62.143822][ T8642] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.151631][ T8642] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.159366][ T8642] device bridge_slave_0 entered promiscuous mode [ 62.167404][ T8642] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.174485][ T8642] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.182267][ T8642] device bridge_slave_1 entered promiscuous mode [ 62.197618][ T8642] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 62.207816][ T8642] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 62.225657][ T8642] team0: Port device team_slave_0 added [ 62.232958][ T8642] team0: Port device team_slave_1 added [ 62.289189][ T8642] device hsr_slave_0 entered promiscuous mode [ 62.356927][ T8642] device hsr_slave_1 entered promiscuous mode [ 62.444121][ T8642] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.451437][ T8642] bridge0: port 2(bridge_slave_1) entered forwarding state [ 62.459143][ T8642] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.466314][ T8642] bridge0: port 1(bridge_slave_0) entered forwarding state [ 62.499849][ T8642] 8021q: adding VLAN 0 to HW filter on device bond0 [ 62.511244][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 62.520993][ T179] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.529404][ T179] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.537921][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 62.549611][ T8642] 8021q: adding VLAN 0 to HW filter on device team0 [ 62.559885][ T3766] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 62.568469][ T3766] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.575491][ T3766] bridge0: port 1(bridge_slave_0) entered forwarding state [ 62.598533][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 62.607258][ T179] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.614330][ T179] bridge0: port 2(bridge_slave_1) entered forwarding state [ 62.622392][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 62.630928][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 62.639305][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 62.647983][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 62.656517][ T179] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 62.665148][ T8642] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 62.682838][ T8642] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 167.736617][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 167.743347][ C0] rcu: 0-...!: (10499 ticks this GP) idle=fce/1/0x4000000000000002 softirq=9154/9154 fqs=5 [ 167.753603][ C0] (t=10501 jiffies g=6425 q=55) [ 167.758523][ C0] rcu: rcu_preempt kthread starved for 10492 jiffies! g6425 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 167.769771][ C0] rcu: RCU grace-period kthread stack dump: [ 167.775636][ C0] rcu_preempt I29656 10 2 0x80004000 [ 167.781958][ C0] Call Trace: [ 167.785246][ C0] __schedule+0x755/0x1580 [ 167.789645][ C0] ? __sched_text_start+0x8/0x8 [ 167.794471][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 167.800257][ C0] ? schedule_timeout+0x47c/0xc50 [ 167.805264][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 167.810530][ C0] schedule+0xd9/0x260 [ 167.814581][ C0] schedule_timeout+0x486/0xc50 [ 167.819406][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 167.825196][ C0] ? usleep_range+0x170/0x170 [ 167.829850][ C0] ? trace_hardirqs_on+0x67/0x240 [ 167.834853][ C0] ? __kasan_check_read+0x11/0x20 [ 167.839863][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 167.845392][ C0] ? swake_up_one+0x60/0x60 [ 167.849881][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 167.854640][ C0] ? rcu_barrier+0x310/0x310 [ 167.859210][ C0] ? trace_hardirqs_on+0x67/0x240 [ 167.864214][ C0] ? __kasan_check_read+0x11/0x20 [ 167.869222][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 167.875443][ C0] ? __kthread_parkme+0x108/0x1c0 [ 167.880444][ C0] ? __kasan_check_read+0x11/0x20 [ 167.885450][ C0] kthread+0x361/0x430 [ 167.889497][ C0] ? rcu_barrier+0x310/0x310 [ 167.894065][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 167.900293][ C0] ret_from_fork+0x24/0x30 [ 167.904723][ C0] NMI backtrace for cpu 0 [ 167.909035][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc7+ #0 [ 167.916288][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 167.926327][ C0] Call Trace: [ 167.929591][ C0] [ 167.932424][ C0] dump_stack+0x172/0x1f0 [ 167.936735][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 167.941915][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 167.948133][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 167.953743][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 167.959706][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 167.965578][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 167.970675][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 167.976200][ C0] ? raise_softirq+0x138/0x340 [ 167.980949][ C0] update_process_times+0x32/0x80 [ 167.985953][ C0] tick_sched_handle+0xa2/0x190 [ 167.990782][ C0] tick_sched_timer+0x53/0x140 [ 167.995527][ C0] __hrtimer_run_queues+0x364/0xe40 [ 168.000708][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 168.005972][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 168.011506][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 168.017202][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 168.023250][ C0] hrtimer_interrupt+0x314/0x770 [ 168.028187][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 168.033711][ C0] apic_timer_interrupt+0xf/0x20 [ 168.038624][ C0] [ 168.041544][ C0] RIP: 0010:write_comp_data+0x9/0x70 [ 168.046811][ C0] Code: 12 00 00 8b 80 f4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 <65> 8b 05 58 88 8f 7e a9 00 01 1f 00 75 51 41 8b 80 f0 12 00 00 83 [ 168.066394][ C0] RSP: 0018:ffff8880a98b6990 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 168.074783][ C0] RAX: 0000000000000001 RBX: ffff8880a143e7b8 RCX: ffffffff85c7e179 [ 168.082757][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 168.090708][ C0] RBP: ffff8880a98b6998 R08: ffff8880a98a4240 R09: fffffbfff14e9555 [ 168.098671][ C0] R10: ffff8880a98a4b98 R11: ffff8880a98a4240 R12: dffffc0000000000 [ 168.106623][ C0] R13: ffff8880a143e4c0 R14: ffff8880a143e858 R15: ffff8880a143e850 [ 168.114585][ C0] ? hhf_dequeue+0x679/0xa20 [ 168.119157][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 168.125377][ C0] hhf_dequeue+0x679/0xa20 [ 168.129778][ C0] __qdisc_run+0x1e7/0x19d0 [ 168.134271][ C0] ? dev_queue_xmit+0x18/0x20 [ 168.138941][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 168.143960][ C0] ? process_backlog+0x206/0x750 [ 168.148874][ C0] ? net_rx_action+0x4d6/0x1080 [ 168.153702][ C0] ? __do_softirq+0x262/0x98c [ 168.158372][ C0] ? run_ksoftirqd+0x8e/0x110 [ 168.163024][ C0] ? smpboot_thread_fn+0x6a3/0xa40 [ 168.168118][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 168.173390][ C0] ? __skb_ext_put+0xd9/0x210 [ 168.178060][ C0] dev_queue_xmit+0x18/0x20 [ 168.182550][ C0] ? dev_queue_xmit+0x18/0x20 [ 168.187208][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 168.192558][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 168.197223][ C0] ? lock_downgrade+0x920/0x920 [ 168.202057][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 168.207326][ C0] br_nf_post_routing+0x1502/0x1d30 [ 168.212507][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 168.218031][ C0] ? mark_held_locks+0xf0/0xf0 [ 168.222773][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 168.228557][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 168.234349][ C0] nf_hook_slow+0xbc/0x1e0 [ 168.238748][ C0] br_forward_finish+0x215/0x400 [ 168.243668][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 168.249216][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 168.253969][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 168.259672][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 168.264257][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 168.269198][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 168.274728][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 168.279832][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 168.285367][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 168.291696][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 168.297579][ C0] br_nf_forward_finish+0x66c/0xa90 [ 168.302757][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 168.308286][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 168.313209][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 168.318474][ C0] ? mark_held_locks+0xf0/0xf0 [ 168.323218][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 168.328306][ C0] ? __vlan_flush+0x120/0x120 [ 168.332973][ C0] nf_hook_slow+0xbc/0x1e0 [ 168.337373][ C0] __br_forward+0x393/0xb00 [ 168.341859][ C0] ? br_forward_finish+0x400/0x400 [ 168.346952][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 168.352482][ C0] deliver_clone+0x61/0xc0 [ 168.356887][ C0] br_flood+0x325/0x3d0 [ 168.361032][ C0] br_handle_frame_finish+0xb46/0x1670 [ 168.366475][ C0] ? br_handle_local_finish+0x20/0x20 [ 168.371826][ C0] ? audit_alloc_mark+0x3d0/0x500 [ 168.376842][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 168.382539][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 168.387110][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 168.392028][ C0] ? br_handle_local_finish+0x20/0x20 [ 168.397381][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 168.402480][ C0] ? find_held_lock+0x35/0x130 [ 168.407226][ C0] ? br_handle_local_finish+0x20/0x20 [ 168.412578][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 168.418464][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 168.424340][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 168.430296][ C0] ? br_handle_local_finish+0x20/0x20 [ 168.435650][ C0] ? __kasan_check_read+0x11/0x20 [ 168.440657][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 168.446006][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 168.451049][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 168.457200][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 168.463432][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 168.469659][ C0] ? skb_pull_rcsum+0x155/0x300 [ 168.474503][ C0] br_nf_pre_routing+0x1743/0x2355 [ 168.479599][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 168.485481][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 168.491450][ C0] br_handle_frame+0x806/0x133e [ 168.496286][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 168.501984][ C0] ? kfree_skb+0x10e/0x3c0 [ 168.506385][ C0] ? br_handle_local_finish+0x20/0x20 [ 168.511758][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 168.517469][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 168.523167][ C0] ? __kasan_check_read+0x11/0x20 [ 168.528170][ C0] ? __kasan_check_read+0x11/0x20 [ 168.533197][ C0] ? do_xdp_generic+0x50/0x50 [ 168.537885][ C0] ? __kasan_check_read+0x11/0x20 [ 168.542904][ C0] ? __lock_acquire+0x8a2/0x4c30 [ 168.547841][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 168.553641][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 168.559618][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 168.565493][ C0] ? lock_acquire+0x190/0x410 [ 168.570145][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 168.576365][ C0] __netif_receive_skb+0x2c/0x1d0 [ 168.581372][ C0] process_backlog+0x206/0x750 [ 168.586114][ C0] ? net_rx_action+0x249/0x1080 [ 168.590941][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 168.596207][ C0] net_rx_action+0x4d6/0x1080 [ 168.600871][ C0] ? napi_busy_loop+0x970/0x970 [ 168.605699][ C0] ? sched_clock+0x2e/0x50 [ 168.610097][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 168.616324][ C0] __do_softirq+0x262/0x98c [ 168.620811][ C0] ? takeover_tasklets+0x820/0x820 [ 168.625900][ C0] run_ksoftirqd+0x8e/0x110 [ 168.630384][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 168.635307][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 168.641527][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 168.647745][ C0] ? __kthread_parkme+0x108/0x1c0 [ 168.652747][ C0] ? __kasan_check_read+0x11/0x20 [ 168.657752][ C0] kthread+0x361/0x430 [ 168.661802][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 168.668019][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 168.674247][ C0] ret_from_fork+0x24/0x30