[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.276305][ T26] audit: type=1800 audit(1568531533.850:25): pid=8633 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.319717][ T26] audit: type=1800 audit(1568531533.850:26): pid=8633 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.353030][ T26] audit: type=1800 audit(1568531533.850:27): pid=8633 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 '10.128.1.53' (ECDSA) to the list of known hosts. syzkaller login: [ 295.147793][ T8786] IPVS: ftp: loaded support on port[0] = 21 [ 295.209109][ T8786] chnl_net:caif_netlink_parms(): no params data found [ 295.237223][ T8786] bridge0: port 1(bridge_slave_0) entered blocking state [ 295.245386][ T8786] bridge0: port 1(bridge_slave_0) entered disabled state [ 295.253398][ T8786] device bridge_slave_0 entered promiscuous mode [ 295.261540][ T8786] bridge0: port 2(bridge_slave_1) entered blocking state [ 295.268655][ T8786] bridge0: port 2(bridge_slave_1) entered disabled state [ 295.276517][ T8786] device bridge_slave_1 entered promiscuous mode [ 295.293354][ T8786] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 295.304970][ T8786] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 295.324285][ T8786] team0: Port device team_slave_0 added [ 295.331263][ T8786] team0: Port device team_slave_1 added [ 295.411621][ T8786] device hsr_slave_0 entered promiscuous mode [ 295.490008][ T8786] device hsr_slave_1 entered promiscuous mode [ 295.537105][ T8786] bridge0: port 2(bridge_slave_1) entered blocking state [ 295.544292][ T8786] bridge0: port 2(bridge_slave_1) entered forwarding state [ 295.552153][ T8786] bridge0: port 1(bridge_slave_0) entered blocking state [ 295.559384][ T8786] bridge0: port 1(bridge_slave_0) entered forwarding state [ 295.591890][ T8786] 8021q: adding VLAN 0 to HW filter on device bond0 [ 295.607601][ T8786] 8021q: adding VLAN 0 to HW filter on device team0 [ 295.616521][ T8789] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 295.625694][ T8789] bridge0: port 1(bridge_slave_0) entered disabled state [ 295.633810][ T8789] bridge0: port 2(bridge_slave_1) entered disabled state [ 295.642385][ T8789] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 295.661874][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 295.670937][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 295.678136][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 295.686048][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 295.695163][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 295.702273][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 295.713541][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 295.722330][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 295.734607][ T8788] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 295.749457][ T8786] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 295.761060][ T8786] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 295.773143][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 295.782048][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 295.790659][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 295.808227][ T8786] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 401.119647][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 401.126552][ C0] rcu: 0-...!: (1 GPs behind) idle=ede/1/0x4000000000000002 softirq=9216/9217 fqs=3 [ 401.136308][ C0] (t=10501 jiffies g=7401 q=2) [ 401.141158][ C0] rcu: rcu_preempt kthread starved for 10496 jiffies! g7401 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 401.152239][ C0] rcu: RCU grace-period kthread stack dump: [ 401.158131][ C0] rcu_preempt R running task 29688 10 2 0x80004000 [ 401.166036][ C0] Call Trace: [ 401.169409][ C0] __schedule+0x755/0x1580 [ 401.173913][ C0] ? __sched_text_start+0x8/0x8 [ 401.178833][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 401.184625][ C0] ? schedule_timeout+0x47c/0xc50 [ 401.189646][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 401.194925][ C0] schedule+0xd9/0x260 [ 401.198985][ C0] schedule_timeout+0x486/0xc50 [ 401.203905][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 401.209698][ C0] ? usleep_range+0x170/0x170 [ 401.216270][ C0] ? trace_hardirqs_on+0x67/0x240 [ 401.221357][ C0] ? __kasan_check_read+0x11/0x20 [ 401.226367][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 401.231897][ C0] ? swake_up_one+0x60/0x60 [ 401.236407][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 401.241185][ C0] ? rcu_barrier+0x310/0x310 [ 401.245782][ C0] ? trace_hardirqs_on+0x67/0x240 [ 401.250804][ C0] ? __kasan_check_read+0x11/0x20 [ 401.255825][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 401.262069][ C0] ? __kthread_parkme+0x108/0x1c0 [ 401.267096][ C0] ? __kasan_check_read+0x11/0x20 [ 401.272108][ C0] kthread+0x361/0x430 [ 401.276165][ C0] ? rcu_barrier+0x310/0x310 [ 401.280738][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 401.286964][ C0] ret_from_fork+0x24/0x30 [ 401.291387][ C0] NMI backtrace for cpu 0 [ 401.295701][ C0] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.3.0-rc7+ #0 [ 401.303019][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 401.313128][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 401.319244][ C0] Call Trace: [ 401.322701][ C0] [ 401.325613][ C0] dump_stack+0x172/0x1f0 [ 401.329943][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 401.335128][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 401.341366][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 401.347004][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 401.352996][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 401.358875][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 401.363992][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 401.369522][ C0] ? raise_softirq+0x138/0x340 [ 401.374279][ C0] update_process_times+0x32/0x80 [ 401.379288][ C0] tick_sched_handle+0xa2/0x190 [ 401.384124][ C0] tick_sched_timer+0x53/0x140 [ 401.389240][ C0] __hrtimer_run_queues+0x364/0xe40 [ 401.394428][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 401.399717][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 401.405287][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 401.411012][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 401.417076][ C0] hrtimer_interrupt+0x314/0x770 [ 401.422265][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 401.427806][ C0] apic_timer_interrupt+0xf/0x20 [ 401.432726][ C0] [ 401.435699][ C0] RIP: 0010:hhf_dequeue+0x5e7/0xa20 [ 401.440947][ C0] Code: 89 73 10 e8 fb 6d 76 fd 31 ff 41 89 c6 89 c6 e8 5f 92 aa fb 45 84 f6 74 63 e8 15 91 aa fb 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <0f> 85 f3 03 00 00 48 8d 7b 08 4c 8b 3b 48 89 fa 48 c1 ea 03 42 80 [ 401.460554][ C0] RSP: 0018:ffff8880a988ed58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 401.468972][ C0] RAX: 1ffff11014981e17 RBX: ffff8880a4c0f0b8 RCX: ffffffff85c7e431 [ 401.476940][ C0] RDX: 0000000000000000 RSI: ffffffff85c7e43b RDI: 0000000000000001 [ 401.484903][ C0] RBP: ffff8880a988eda8 R08: ffff8880a9880140 R09: fffffbfff14e9755 [ 401.492873][ C0] R10: ffff8880a9880b38 R11: ffff8880a9880140 R12: dffffc0000000000 [ 401.500830][ C0] R13: ffff8880a4c0edc0 R14: 0000000000000001 R15: 0000000000000000 [ 401.508804][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 401.513402][ C0] ? hhf_dequeue+0x5db/0xa20 [ 401.517979][ C0] ? hhf_dequeue+0x5db/0xa20 [ 401.522633][ C0] __qdisc_run+0x1e7/0x19d0 [ 401.529246][ C0] ? dev_queue_xmit+0x18/0x20 [ 401.533915][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 401.538925][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 401.544288][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 401.549565][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 401.555863][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 401.561174][ C0] ? br_forward_finish+0x235/0x400 [ 401.566290][ C0] ? find_held_lock+0x35/0x130 [ 401.571042][ C0] ? br_forward_finish+0x235/0x400 [ 401.576146][ C0] dev_queue_xmit+0x18/0x20 [ 401.580634][ C0] ? dev_queue_xmit+0x18/0x20 [ 401.585308][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 401.590678][ C0] ? __kasan_check_read+0x11/0x20 [ 401.595688][ C0] br_forward_finish+0xfa/0x400 [ 401.600527][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 401.606087][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 401.610873][ C0] ? __kasan_check_read+0x11/0x20 [ 401.615893][ C0] __br_forward+0x641/0xb00 [ 401.620392][ C0] ? br_forward_finish+0x400/0x400 [ 401.625497][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 401.631034][ C0] deliver_clone+0x61/0xc0 [ 401.635440][ C0] maybe_deliver+0x2c7/0x390 [ 401.640109][ C0] br_flood+0x13a/0x3d0 [ 401.644274][ C0] br_dev_xmit+0x98c/0x15a0 [ 401.648787][ C0] ? br_poll_controller+0x10/0x10 [ 401.653817][ C0] ? netif_skb_features+0x6c2/0xb90 [ 401.659017][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 401.665282][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 401.670419][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 401.675454][ C0] ? __kasan_check_read+0x11/0x20 [ 401.680558][ C0] ? __lock_acquire+0x1702/0x4c30 [ 401.685680][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 401.690961][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 401.696321][ C0] ? __kasan_check_read+0x11/0x20 [ 401.701330][ C0] ? mark_lock+0xc0/0x11e0 [ 401.705738][ C0] ? mark_held_locks+0xa4/0xf0 [ 401.710493][ C0] dev_queue_xmit+0x18/0x20 [ 401.714981][ C0] ? dev_queue_xmit+0x18/0x20 [ 401.719713][ C0] neigh_resolve_output+0x5a5/0x970 [ 401.724931][ C0] ip6_finish_output2+0x1034/0x2520 [ 401.730141][ C0] ? ip6_forward_finish+0x530/0x530 [ 401.735332][ C0] ? lock_downgrade+0x920/0x920 [ 401.740461][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 401.746872][ C0] ? __kasan_check_read+0x11/0x20 [ 401.751895][ C0] __ip6_finish_output+0x444/0xa50 [ 401.757145][ C0] ? __ip6_finish_output+0x444/0xa50 [ 401.762448][ C0] ip6_finish_output+0x38/0x1f0 [ 401.767316][ C0] ip6_output+0x235/0x7c0 [ 401.771638][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 401.776779][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 401.782152][ C0] ndisc_send_skb+0xf29/0x1450 [ 401.787206][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 401.792545][ C0] ? skb_set_owner_w+0x21b/0x320 [ 401.797493][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 401.803214][ C0] ndisc_send_ns+0x3a9/0x850 [ 401.807795][ C0] ? mark_held_locks+0xa4/0xf0 [ 401.812742][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 401.817940][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 401.823233][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 401.828431][ C0] ? trace_hardirqs_on+0x67/0x240 [ 401.833446][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 401.838749][ C0] addrconf_dad_work+0xb88/0x1150 [ 401.843919][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 401.849470][ C0] process_one_work+0x9af/0x1740 [ 401.854417][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 401.859773][ C0] ? lock_acquire+0x190/0x410 [ 401.864439][ C0] worker_thread+0x98/0xe40 [ 401.868936][ C0] kthread+0x361/0x430 [ 401.872990][ C0] ? process_one_work+0x1740/0x1740 [ 401.878173][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 401.884401][ C0] ret_from_fork+0x24/0x30