[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.067562][ T26] audit: type=1800 audit(1568522488.129:25): pid=8597 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.089607][ T26] audit: type=1800 audit(1568522488.129:26): pid=8597 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.110571][ T26] audit: type=1800 audit(1568522488.129:27): pid=8597 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 '10.128.10.2' (ECDSA) to the list of known hosts. syzkaller login: [ 98.891575][ T8753] IPVS: ftp: loaded support on port[0] = 21 [ 98.948087][ T8753] chnl_net:caif_netlink_parms(): no params data found [ 98.975147][ T8753] bridge0: port 1(bridge_slave_0) entered blocking state [ 98.983229][ T8753] bridge0: port 1(bridge_slave_0) entered disabled state [ 98.991096][ T8753] device bridge_slave_0 entered promiscuous mode [ 98.999629][ T8753] bridge0: port 2(bridge_slave_1) entered blocking state [ 99.006912][ T8753] bridge0: port 2(bridge_slave_1) entered disabled state [ 99.014722][ T8753] device bridge_slave_1 entered promiscuous mode [ 99.031475][ T8753] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 99.041937][ T8753] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 99.060591][ T8753] team0: Port device team_slave_0 added [ 99.067472][ T8753] team0: Port device team_slave_1 added [ 99.141040][ T8753] device hsr_slave_0 entered promiscuous mode [ 99.199038][ T8753] device hsr_slave_1 entered promiscuous mode [ 99.247094][ T8753] bridge0: port 2(bridge_slave_1) entered blocking state [ 99.254556][ T8753] bridge0: port 2(bridge_slave_1) entered forwarding state [ 99.262582][ T8753] bridge0: port 1(bridge_slave_0) entered blocking state [ 99.269686][ T8753] bridge0: port 1(bridge_slave_0) entered forwarding state [ 99.303863][ T8753] 8021q: adding VLAN 0 to HW filter on device bond0 [ 99.316596][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 99.337932][ T2998] bridge0: port 1(bridge_slave_0) entered disabled state [ 99.346739][ T2998] bridge0: port 2(bridge_slave_1) entered disabled state [ 99.356000][ T2998] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 99.368243][ T8753] 8021q: adding VLAN 0 to HW filter on device team0 [ 99.389820][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 99.399056][ T3504] bridge0: port 1(bridge_slave_0) entered blocking state [ 99.406165][ T3504] bridge0: port 1(bridge_slave_0) entered forwarding state [ 99.422952][ T8755] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 99.431382][ T8755] bridge0: port 2(bridge_slave_1) entered blocking state [ 99.438593][ T8755] bridge0: port 2(bridge_slave_1) entered forwarding state [ 99.456738][ T8753] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 99.468081][ T8753] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 99.480571][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 99.490440][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 99.499268][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 99.508294][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 99.517414][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 99.525287][ T3504] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 99.543393][ T8753] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 204.578391][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 204.585177][ C1] rcu: 1-...!: (10499 ticks this GP) idle=5a2/1/0x4000000000000002 softirq=9015/9015 fqs=11 [ 204.595572][ C1] (t=10501 jiffies g=7069 q=96) [ 204.600523][ C1] rcu: rcu_preempt kthread starved for 10479 jiffies! g7069 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 204.611781][ C1] rcu: RCU grace-period kthread stack dump: [ 204.617655][ C1] rcu_preempt I29440 10 2 0x80004000 [ 204.623979][ C1] Call Trace: [ 204.627268][ C1] __schedule+0x76e/0x17a0 [ 204.631681][ C1] ? __sched_text_start+0x8/0x8 [ 204.636517][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 204.642309][ C1] ? schedule_timeout+0x47c/0xc50 [ 204.647333][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 204.652621][ C1] schedule+0xd9/0x260 [ 204.656680][ C1] schedule_timeout+0x486/0xc50 [ 204.661517][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 204.667336][ C1] ? usleep_range+0x170/0x170 [ 204.672083][ C1] ? trace_hardirqs_on+0x67/0x240 [ 204.677109][ C1] ? __kasan_check_read+0x11/0x20 [ 204.682124][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 204.687667][ C1] ? swake_up_one+0x60/0x60 [ 204.692160][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 204.696922][ C1] ? invoke_rcu_core+0x230/0x230 [ 204.701842][ C1] ? trace_hardirqs_on+0x67/0x240 [ 204.706850][ C1] ? __kasan_check_read+0x11/0x20 [ 204.711874][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 204.718096][ C1] ? __kthread_parkme+0x108/0x1c0 [ 204.723136][ C1] ? __kasan_check_read+0x11/0x20 [ 204.728148][ C1] kthread+0x361/0x430 [ 204.732201][ C1] ? invoke_rcu_core+0x230/0x230 [ 204.737210][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 204.743439][ C1] ret_from_fork+0x24/0x30 [ 204.747880][ C1] NMI backtrace for cpu 1 [ 204.752212][ C1] CPU: 1 PID: 8755 Comm: kworker/1:3 Not tainted 5.3.0-rc6-next-20190830 #75 [ 204.760950][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 204.771112][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 204.777069][ C1] Call Trace: [ 204.780337][ C1] [ 204.783274][ C1] dump_stack+0x172/0x1f0 [ 204.787681][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 204.792877][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 204.799366][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 204.804983][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 204.810960][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 204.816838][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 204.821944][ C1] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 204.827487][ C1] ? raise_softirq+0x138/0x340 [ 204.832240][ C1] update_process_times+0x2d/0x70 [ 204.837253][ C1] tick_sched_handle+0xa2/0x190 [ 204.842091][ C1] tick_sched_timer+0x53/0x140 [ 204.846849][ C1] __hrtimer_run_queues+0x364/0xe40 [ 204.852033][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 204.857316][ C1] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 204.863295][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 204.869171][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 204.875227][ C1] hrtimer_interrupt+0x314/0x770 [ 204.880163][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 204.885693][ C1] apic_timer_interrupt+0xf/0x20 [ 204.890625][ C1] [ 204.893566][ C1] RIP: 0010:hhf_dequeue+0x630/0xa20 [ 204.898751][ C1] Code: 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 42 80 3c 22 00 <0f> 85 89 03 00 00 4d 89 3e e8 d2 e6 a6 fb 4d 8d b5 98 03 00 00 4c [ 204.918340][ C1] RSP: 0018:ffff88809095ed58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 204.926737][ C1] RAX: 1ffff1101247265f RBX: ffff8880923932f8 RCX: ffffffff85cb6ed1 [ 204.934701][ C1] RDX: 1ffff11012472672 RSI: ffffffff85cb6edb RDI: ffff888092393398 [ 204.942755][ C1] RBP: ffff88809095eda8 R08: ffff8880964ee240 R09: fffffbfff14ed341 [ 204.950835][ C1] R10: ffff8880964eec48 R11: ffff8880964ee240 R12: dffffc0000000000 [ 204.958805][ C1] R13: ffff888092393000 R14: ffff888092393390 R15: ffff888092393390 [ 204.967598][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 204.972198][ C1] ? hhf_dequeue+0x5db/0xa20 [ 204.976776][ C1] ? hhf_dequeue+0x5db/0xa20 [ 204.981359][ C1] __qdisc_run+0x1e7/0x19d0 [ 204.985862][ C1] ? dev_queue_xmit+0x18/0x20 [ 204.990529][ C1] __dev_queue_xmit+0x16f1/0x37c0 [ 204.995543][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 205.001683][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 205.006987][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 205.013219][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 205.018489][ C1] ? br_forward_finish+0x235/0x400 [ 205.023584][ C1] ? find_held_lock+0x35/0x130 [ 205.028353][ C1] ? br_forward_finish+0x235/0x400 [ 205.033463][ C1] dev_queue_xmit+0x18/0x20 [ 205.037978][ C1] ? dev_queue_xmit+0x18/0x20 [ 205.042642][ C1] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 205.047999][ C1] ? __kasan_check_read+0x11/0x20 [ 205.053010][ C1] br_forward_finish+0xfa/0x400 [ 205.057847][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 205.063390][ C1] ? br_fdb_add.cold+0x83/0x83 [ 205.068139][ C1] ? __kasan_check_read+0x11/0x20 [ 205.073172][ C1] __br_forward+0x641/0xb00 [ 205.077669][ C1] ? br_forward_finish+0x400/0x400 [ 205.082812][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 205.088447][ C1] deliver_clone+0x61/0xc0 [ 205.092860][ C1] maybe_deliver+0x2c7/0x390 [ 205.097455][ C1] br_flood+0x13a/0x3d0 [ 205.101604][ C1] br_dev_xmit+0x98c/0x15a0 [ 205.106265][ C1] ? br_poll_controller+0x10/0x10 [ 205.111429][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 205.117589][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 205.123133][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 205.129141][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 205.135375][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 205.140495][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 205.146984][ C1] __dev_queue_xmit+0x2b82/0x37c0 [ 205.151995][ C1] ? __kasan_check_read+0x11/0x20 [ 205.157016][ C1] ? __lock_acquire+0x16f2/0x4a00 [ 205.162031][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 205.167500][ C1] ? ip6_finish_output2+0x1034/0x2550 [ 205.172881][ C1] ? __kasan_check_read+0x11/0x20 [ 205.177898][ C1] ? mark_lock+0xc2/0x1220 [ 205.182310][ C1] ? mark_held_locks+0xa4/0xf0 [ 205.187072][ C1] dev_queue_xmit+0x18/0x20 [ 205.191578][ C1] ? dev_queue_xmit+0x18/0x20 [ 205.196242][ C1] neigh_resolve_output+0x5a5/0x970 [ 205.201434][ C1] ip6_finish_output2+0x1034/0x2550 [ 205.206629][ C1] ? ip6_forward_finish+0x570/0x570 [ 205.211811][ C1] ? lock_downgrade+0x920/0x920 [ 205.216648][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 205.222894][ C1] ? __kasan_check_read+0x11/0x20 [ 205.228302][ C1] __ip6_finish_output+0x444/0xaa0 [ 205.233396][ C1] ? __ip6_finish_output+0x444/0xaa0 [ 205.238669][ C1] ip6_finish_output+0x38/0x1f0 [ 205.243506][ C1] ip6_output+0x235/0x7f0 [ 205.247858][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 205.253050][ C1] ? __ip6_finish_output+0xaa0/0xaa0 [ 205.258337][ C1] ndisc_send_skb+0xf29/0x14a0 [ 205.263958][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 205.269247][ C1] ? skb_set_owner_w+0x21b/0x320 [ 205.274611][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 205.280317][ C1] ndisc_send_ns+0x3a9/0x850 [ 205.285095][ C1] ? mark_held_locks+0xa4/0xf0 [ 205.289844][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 205.295034][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 205.300313][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 205.305492][ C1] ? trace_hardirqs_on+0x67/0x240 [ 205.310502][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 205.315690][ C1] addrconf_dad_work+0xb88/0x1150 [ 205.320703][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 205.326248][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 205.332231][ C1] ? trace_hardirqs_on+0x67/0x240 [ 205.337257][ C1] process_one_work+0x9af/0x1740 [ 205.342272][ C1] ? __schedule+0x776/0x17a0 [ 205.346870][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 205.352235][ C1] ? lock_acquire+0x190/0x410 [ 205.356971][ C1] worker_thread+0x98/0xe40 [ 205.361477][ C1] ? trace_hardirqs_on+0x67/0x240 [ 205.366499][ C1] kthread+0x361/0x430 [ 205.370554][ C1] ? process_one_work+0x1740/0x1740 [ 205.375740][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 205.381967][ C1] ret_from_fork+0x24/0x30