[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.608612][ T26] audit: type=1800 audit(1568460028.066:25): pid=8573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.656997][ T26] audit: type=1800 audit(1568460028.066:26): pid=8573 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.692711][ T26] audit: type=1800 audit(1568460028.066:27): pid=8573 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 '10.128.0.38' (ECDSA) to the list of known hosts. syzkaller login: [ 321.657446][ T8726] IPVS: ftp: loaded support on port[0] = 21 [ 321.719646][ T8726] chnl_net:caif_netlink_parms(): no params data found [ 321.744978][ T8726] bridge0: port 1(bridge_slave_0) entered blocking state [ 321.752896][ T8726] bridge0: port 1(bridge_slave_0) entered disabled state [ 321.760656][ T8726] device bridge_slave_0 entered promiscuous mode [ 321.768926][ T8726] bridge0: port 2(bridge_slave_1) entered blocking state [ 321.776076][ T8726] bridge0: port 2(bridge_slave_1) entered disabled state [ 321.784023][ T8726] device bridge_slave_1 entered promiscuous mode [ 321.801038][ T8726] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 321.811337][ T8726] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 321.830260][ T8726] team0: Port device team_slave_0 added [ 321.837901][ T8726] team0: Port device team_slave_1 added [ 321.889241][ T8726] device hsr_slave_0 entered promiscuous mode [ 321.937520][ T8726] device hsr_slave_1 entered promiscuous mode [ 321.984181][ T8726] bridge0: port 2(bridge_slave_1) entered blocking state [ 321.991366][ T8726] bridge0: port 2(bridge_slave_1) entered forwarding state [ 321.999243][ T8726] bridge0: port 1(bridge_slave_0) entered blocking state [ 322.006290][ T8726] bridge0: port 1(bridge_slave_0) entered forwarding state [ 322.039093][ T8726] 8021q: adding VLAN 0 to HW filter on device bond0 [ 322.052136][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 322.072225][ T8729] bridge0: port 1(bridge_slave_0) entered disabled state [ 322.080655][ T8729] bridge0: port 2(bridge_slave_1) entered disabled state [ 322.089664][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 322.101066][ T8726] 8021q: adding VLAN 0 to HW filter on device team0 [ 322.111239][ T3515] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 322.119890][ T3515] bridge0: port 1(bridge_slave_0) entered blocking state [ 322.127022][ T3515] bridge0: port 1(bridge_slave_0) entered forwarding state [ 322.138388][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 322.146728][ T8729] bridge0: port 2(bridge_slave_1) entered blocking state [ 322.153805][ T8729] bridge0: port 2(bridge_slave_1) entered forwarding state [ 322.168189][ T3515] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 322.177507][ T3515] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 322.187225][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 322.198865][ T3515] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 322.210837][ T8726] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 322.223354][ T8726] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 322.231233][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 322.247788][ T8726] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 427.496913][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 427.503724][ C0] rcu: 0-...!: (10500 ticks this GP) idle=6da/1/0x4000000000000002 softirq=9292/9292 fqs=0 [ 427.514025][ C0] (t=10501 jiffies g=7101 q=42) [ 427.518954][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g7101 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 427.530293][ C0] rcu: RCU grace-period kthread stack dump: [ 427.536172][ C0] rcu_preempt I29688 10 2 0x80004000 [ 427.542486][ C0] Call Trace: [ 427.545846][ C0] __schedule+0x755/0x1580 [ 427.550249][ C0] ? __sched_text_start+0x8/0x8 [ 427.555083][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 427.560866][ C0] ? schedule_timeout+0x47c/0xc50 [ 427.565871][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 427.571139][ C0] schedule+0xd9/0x260 [ 427.575213][ C0] schedule_timeout+0x486/0xc50 [ 427.580043][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 427.585832][ C0] ? usleep_range+0x170/0x170 [ 427.590490][ C0] ? trace_hardirqs_on+0x67/0x240 [ 427.595493][ C0] ? __kasan_check_read+0x11/0x20 [ 427.600504][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 427.606031][ C0] ? swake_up_one+0x60/0x60 [ 427.610524][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 427.615271][ C0] ? rcu_barrier+0x310/0x310 [ 427.619840][ C0] ? trace_hardirqs_on+0x67/0x240 [ 427.624844][ C0] ? __kasan_check_read+0x11/0x20 [ 427.629852][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 427.636074][ C0] ? __kthread_parkme+0x108/0x1c0 [ 427.641077][ C0] ? __kasan_check_read+0x11/0x20 [ 427.646084][ C0] kthread+0x361/0x430 [ 427.650136][ C0] ? rcu_barrier+0x310/0x310 [ 427.654706][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 427.660926][ C0] ret_from_fork+0x24/0x30 [ 427.665426][ C0] NMI backtrace for cpu 0 [ 427.669769][ C0] CPU: 0 PID: 3515 Comm: kworker/0:2 Not tainted 5.3.0-rc7+ #0 [ 427.677436][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 427.687543][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 427.693498][ C0] Call Trace: [ 427.696764][ C0] [ 427.699628][ C0] dump_stack+0x172/0x1f0 [ 427.703941][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 427.709124][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 427.715411][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 427.721047][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 427.727033][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 427.732918][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 427.738028][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 427.743559][ C0] ? raise_softirq+0x138/0x340 [ 427.748310][ C0] update_process_times+0x32/0x80 [ 427.753324][ C0] tick_sched_handle+0xa2/0x190 [ 427.758158][ C0] tick_sched_timer+0x53/0x140 [ 427.762914][ C0] __hrtimer_run_queues+0x364/0xe40 [ 427.768095][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 427.773363][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 427.778891][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 427.784589][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 427.790639][ C0] hrtimer_interrupt+0x314/0x770 [ 427.795636][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 427.801174][ C0] apic_timer_interrupt+0xf/0x20 [ 427.806103][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x50 [ 427.812237][ C0] Code: 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 a4 88 8f 7e 81 e2 00 01 1f 00 <48> 8b 75 08 75 2b 8b 90 f0 12 00 00 83 fa 02 75 20 48 8b 88 f8 12 [ 427.831906][ C0] RSP: 0018:ffff8880ae808b38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 427.840307][ C0] RAX: ffff88809c5001c0 RBX: ffff8880a76b27b8 RCX: ffffffff85c7e431 [ 427.848276][ C0] RDX: 0000000000000100 RSI: ffffffff85c7e43b RDI: ffff8880a76b2858 [ 427.856227][ C0] RBP: ffff8880ae808b38 R08: ffff88809c5001c0 R09: fffffbfff14e9755 [ 427.864176][ C0] R10: ffff88809c500bb8 R11: ffff88809c5001c0 R12: dffffc0000000000 [ 427.872131][ C0] R13: ffff8880a76b24c0 R14: ffff8880a76b2850 R15: ffff8880a76b2850 [ 427.880111][ C0] ? apic_timer_interrupt+0xa/0x20 [ 427.885267][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 427.889866][ C0] ? hhf_dequeue+0x5db/0xa20 [ 427.894452][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 427.900675][ C0] hhf_dequeue+0x63e/0xa20 [ 427.905138][ C0] __qdisc_run+0x1e7/0x19d0 [ 427.909656][ C0] ? dev_queue_xmit+0x18/0x20 [ 427.914324][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 427.919340][ C0] ? process_backlog+0x206/0x750 [ 427.924270][ C0] ? net_rx_action+0x4d6/0x1080 [ 427.929107][ C0] ? __do_softirq+0x262/0x98c [ 427.933763][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 427.938944][ C0] ? do_softirq.part.0+0x11a/0x170 [ 427.944039][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 427.949358][ C0] ? __skb_ext_put+0xd9/0x210 [ 427.954022][ C0] dev_queue_xmit+0x18/0x20 [ 427.958521][ C0] ? dev_queue_xmit+0x18/0x20 [ 427.963272][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 427.968637][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 427.973306][ C0] ? lock_downgrade+0x920/0x920 [ 427.978188][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 427.983474][ C0] br_nf_post_routing+0x1502/0x1d30 [ 427.988661][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 427.994210][ C0] ? mark_held_locks+0xf0/0xf0 [ 427.998957][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 428.004746][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 428.010581][ C0] nf_hook_slow+0xbc/0x1e0 [ 428.014985][ C0] br_forward_finish+0x215/0x400 [ 428.019907][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 428.025436][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 428.030183][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.035883][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 428.040472][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 428.045400][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 428.050930][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 428.056023][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 428.061549][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.067769][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 428.073645][ C0] br_nf_forward_finish+0x66c/0xa90 [ 428.078833][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 428.084367][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 428.089293][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 428.094557][ C0] ? mark_held_locks+0xf0/0xf0 [ 428.099315][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 428.104404][ C0] ? __vlan_flush+0x120/0x120 [ 428.109771][ C0] nf_hook_slow+0xbc/0x1e0 [ 428.114173][ C0] __br_forward+0x393/0xb00 [ 428.118659][ C0] ? br_forward_finish+0x400/0x400 [ 428.123755][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 428.129290][ C0] deliver_clone+0x61/0xc0 [ 428.133695][ C0] br_flood+0x325/0x3d0 [ 428.137842][ C0] br_handle_frame_finish+0xb46/0x1670 [ 428.143285][ C0] ? br_handle_local_finish+0x20/0x20 [ 428.148641][ C0] ? audit_alloc_mark+0x3d0/0x500 [ 428.153647][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.159343][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 428.163915][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 428.168833][ C0] ? br_handle_local_finish+0x20/0x20 [ 428.174188][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 428.179284][ C0] ? find_held_lock+0x35/0x130 [ 428.184032][ C0] ? br_handle_local_finish+0x20/0x20 [ 428.189388][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 428.195258][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 428.201136][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 428.207101][ C0] ? br_handle_local_finish+0x20/0x20 [ 428.212458][ C0] ? __kasan_check_read+0x11/0x20 [ 428.217466][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 428.222816][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 428.227823][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 428.233954][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.240183][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 428.246404][ C0] ? skb_pull_rcsum+0x155/0x300 [ 428.251239][ C0] br_nf_pre_routing+0x1743/0x2355 [ 428.256336][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 428.262219][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 428.268092][ C0] br_handle_frame+0x806/0x133e [ 428.272927][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 428.278621][ C0] ? kfree_skb+0x10e/0x3c0 [ 428.283030][ C0] ? br_handle_local_finish+0x20/0x20 [ 428.288390][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 428.294088][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 428.299703][ C0] ? __kasan_check_read+0x11/0x20 [ 428.304710][ C0] ? do_xdp_generic+0x50/0x50 [ 428.309370][ C0] ? __kasan_check_read+0x11/0x20 [ 428.314377][ C0] ? __lock_acquire+0x8a2/0x4c30 [ 428.319311][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 428.324749][ C0] ? __kasan_check_read+0x11/0x20 [ 428.329755][ C0] ? __lock_acquire+0x1702/0x4c30 [ 428.334778][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 428.340562][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 428.346520][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 428.352395][ C0] ? lock_acquire+0x190/0x410 [ 428.357055][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.363279][ C0] __netif_receive_skb+0x2c/0x1d0 [ 428.368285][ C0] process_backlog+0x206/0x750 [ 428.373028][ C0] ? net_rx_action+0x249/0x1080 [ 428.377858][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 428.383134][ C0] net_rx_action+0x4d6/0x1080 [ 428.388062][ C0] ? napi_busy_loop+0x970/0x970 [ 428.392911][ C0] __do_softirq+0x262/0x98c [ 428.397399][ C0] ? ip6_finish_output2+0x106d/0x2520 [ 428.402751][ C0] do_softirq_own_stack+0x2a/0x40 [ 428.407750][ C0] [ 428.410669][ C0] do_softirq.part.0+0x11a/0x170 [ 428.415595][ C0] __local_bh_enable_ip+0x211/0x270 [ 428.420774][ C0] ip6_finish_output2+0x10a0/0x2520 [ 428.425952][ C0] ? ip6_mtu+0x2e6/0x460 [ 428.430185][ C0] ? ip6_forward_finish+0x530/0x530 [ 428.435362][ C0] ? lock_downgrade+0x920/0x920 [ 428.440192][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.446411][ C0] ? __kasan_check_read+0x11/0x20 [ 428.451417][ C0] __ip6_finish_output+0x444/0xa50 [ 428.456506][ C0] ? __ip6_finish_output+0x444/0xa50 [ 428.461779][ C0] ip6_finish_output+0x38/0x1f0 [ 428.466621][ C0] ip6_output+0x235/0x7c0 [ 428.470941][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 428.476045][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 428.481372][ C0] ndisc_send_skb+0xf29/0x1450 [ 428.486142][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 428.491428][ C0] ? skb_set_owner_w+0x21b/0x320 [ 428.496441][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.502142][ C0] ndisc_send_ns+0x3a9/0x850 [ 428.506711][ C0] ? mark_held_locks+0xa4/0xf0 [ 428.511467][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 428.516640][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 428.521905][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 428.527082][ C0] ? trace_hardirqs_on+0x67/0x240 [ 428.532084][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 428.537268][ C0] addrconf_dad_work+0xb88/0x1150 [ 428.542280][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 428.547812][ C0] process_one_work+0x9af/0x1740 [ 428.552738][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 428.558176][ C0] ? lock_acquire+0x190/0x410 [ 428.562840][ C0] worker_thread+0x98/0xe40 [ 428.567321][ C0] ? trace_hardirqs_on+0x67/0x240 [ 428.572331][ C0] kthread+0x361/0x430 [ 428.576381][ C0] ? process_one_work+0x1740/0x1740 [ 428.581559][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 428.587780][ C0] ret_from_fork+0x24/0x30