[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.108294][ T26] audit: type=1800 audit(1568206372.232:25): pid=8585 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.157677][ T26] audit: type=1800 audit(1568206372.232:26): pid=8585 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.196774][ T26] audit: type=1800 audit(1568206372.232:27): pid=8585 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 '10.128.0.217' (ECDSA) to the list of known hosts. syzkaller login: [ 327.641427][ T8739] IPVS: ftp: loaded support on port[0] = 21 [ 327.702981][ T8739] chnl_net:caif_netlink_parms(): no params data found [ 327.729749][ T8739] bridge0: port 1(bridge_slave_0) entered blocking state [ 327.737161][ T8739] bridge0: port 1(bridge_slave_0) entered disabled state [ 327.745038][ T8739] device bridge_slave_0 entered promiscuous mode [ 327.753097][ T8739] bridge0: port 2(bridge_slave_1) entered blocking state [ 327.760364][ T8739] bridge0: port 2(bridge_slave_1) entered disabled state [ 327.768279][ T8739] device bridge_slave_1 entered promiscuous mode [ 327.784807][ T8739] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 327.795572][ T8739] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 327.813831][ T8739] team0: Port device team_slave_0 added [ 327.821039][ T8739] team0: Port device team_slave_1 added [ 327.869873][ T8739] device hsr_slave_0 entered promiscuous mode [ 327.917863][ T8739] device hsr_slave_1 entered promiscuous mode [ 327.975358][ T8739] bridge0: port 2(bridge_slave_1) entered blocking state [ 327.982526][ T8739] bridge0: port 2(bridge_slave_1) entered forwarding state [ 327.990345][ T8739] bridge0: port 1(bridge_slave_0) entered blocking state [ 327.997385][ T8739] bridge0: port 1(bridge_slave_0) entered forwarding state [ 328.028056][ T8739] 8021q: adding VLAN 0 to HW filter on device bond0 [ 328.039911][ T2409] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 328.050072][ T2409] bridge0: port 1(bridge_slave_0) entered disabled state [ 328.068804][ T2409] bridge0: port 2(bridge_slave_1) entered disabled state [ 328.076653][ T2409] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 328.087955][ T8739] 8021q: adding VLAN 0 to HW filter on device team0 [ 328.099820][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 328.108305][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 328.115353][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 328.125236][ T2409] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 328.134158][ T2409] bridge0: port 2(bridge_slave_1) entered blocking state [ 328.141255][ T2409] bridge0: port 2(bridge_slave_1) entered forwarding state [ 328.159561][ T8746] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 328.168734][ T8746] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 328.176977][ T8746] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 328.191703][ T8746] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 328.202823][ T2409] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 328.213541][ T8739] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 328.231618][ T8739] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 433.267516][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 433.274280][ C1] rcu: 1-...!: (1 GPs behind) idle=232/1/0x4000000000000002 softirq=9055/9056 fqs=14 [ 433.284015][ C1] (t=10501 jiffies g=7037 q=82) [ 433.288951][ C1] rcu: rcu_preempt kthread starved for 10473 jiffies! g7037 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 433.300024][ C1] rcu: RCU grace-period kthread stack dump: [ 433.305893][ C1] rcu_preempt R running task 29032 10 2 0x80004000 [ 433.313772][ C1] Call Trace: [ 433.317125][ C1] __schedule+0x76e/0x17a0 [ 433.321528][ C1] ? __sched_text_start+0x8/0x8 [ 433.326375][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 433.332161][ C1] ? schedule_timeout+0x47c/0xc50 [ 433.337167][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 433.342436][ C1] schedule+0xd9/0x260 [ 433.346489][ C1] schedule_timeout+0x486/0xc50 [ 433.351336][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 433.357123][ C1] ? usleep_range+0x170/0x170 [ 433.361782][ C1] ? trace_hardirqs_on+0x67/0x240 [ 433.366787][ C1] ? __kasan_check_read+0x11/0x20 [ 433.371801][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 433.377346][ C1] ? swake_up_one+0x60/0x60 [ 433.381843][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 433.386608][ C1] ? invoke_rcu_core+0x230/0x230 [ 433.391526][ C1] ? trace_hardirqs_on+0x67/0x240 [ 433.396559][ C1] ? __kasan_check_read+0x11/0x20 [ 433.401573][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 433.407797][ C1] ? __kthread_parkme+0x108/0x1c0 [ 433.412816][ C1] ? __kasan_check_read+0x11/0x20 [ 433.417856][ C1] kthread+0x361/0x430 [ 433.422014][ C1] ? invoke_rcu_core+0x230/0x230 [ 433.426945][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 433.433186][ C1] ret_from_fork+0x24/0x30 [ 433.437599][ C1] NMI backtrace for cpu 1 [ 433.441928][ C1] CPU: 1 PID: 2409 Comm: kworker/1:2 Not tainted 5.3.0-rc6-next-20190830 #75 [ 433.450663][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 433.460805][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 433.466770][ C1] Call Trace: [ 433.470049][ C1] [ 433.472937][ C1] dump_stack+0x172/0x1f0 [ 433.477254][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 433.482439][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 433.488664][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 433.494281][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 433.500246][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 433.506206][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 433.511303][ C1] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 433.516833][ C1] ? raise_softirq+0x138/0x340 [ 433.521588][ C1] update_process_times+0x2d/0x70 [ 433.526606][ C1] tick_sched_handle+0xa2/0x190 [ 433.531438][ C1] tick_sched_timer+0x53/0x140 [ 433.536186][ C1] __hrtimer_run_queues+0x364/0xe40 [ 433.541380][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 433.546740][ C1] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 433.552704][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 433.558423][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 433.564476][ C1] hrtimer_interrupt+0x314/0x770 [ 433.569427][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 433.574954][ C1] apic_timer_interrupt+0xf/0x20 [ 433.579866][ C1] [ 433.582808][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 [ 433.588949][ C1] Code: 90 00 13 00 00 83 fa 02 75 20 48 8b 88 08 13 00 00 8b 80 04 13 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 98 a7 8f 7e a9 [ 433.608532][ C1] RSP: 0018:ffff8880a342f3e8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 433.617631][ C1] RAX: ffff8880a3420080 RBX: ffff8880a48082f8 RCX: ffffffff85cb6f79 [ 433.625582][ C1] RDX: 0000000000000000 RSI: ffffffff85cb6951 RDI: ffff8880a4808300 [ 433.633534][ C1] RBP: ffff8880a342f3e8 R08: ffff8880a3420080 R09: fffffbfff14ed341 [ 433.641502][ C1] R10: ffff8880a3420a38 R11: ffff8880a3420080 R12: dffffc0000000000 [ 433.649468][ C1] R13: ffff8880a4808000 R14: ffff8880a4808398 R15: ffff8880a4808390 [ 433.657501][ C1] ? hhf_dequeue+0x679/0xa20 [ 433.662077][ C1] ? hhf_dequeue+0x51/0xa20 [ 433.666579][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 433.672797][ C1] hhf_dequeue+0x51/0xa20 [ 433.677157][ C1] __qdisc_run+0x1e7/0x19d0 [ 433.681650][ C1] ? dev_queue_xmit+0x18/0x20 [ 433.686316][ C1] __dev_queue_xmit+0x16f1/0x37c0 [ 433.691326][ C1] ? __kasan_check_read+0x11/0x20 [ 433.696338][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 433.701618][ C1] ? ip6_finish_output2+0x1034/0x2550 [ 433.706972][ C1] ? __kasan_check_read+0x11/0x20 [ 433.711995][ C1] ? mark_held_locks+0xa4/0xf0 [ 433.716758][ C1] dev_queue_xmit+0x18/0x20 [ 433.721243][ C1] ? dev_queue_xmit+0x18/0x20 [ 433.725951][ C1] neigh_resolve_output+0x5a5/0x970 [ 433.731149][ C1] ip6_finish_output2+0x1034/0x2550 [ 433.736334][ C1] ? ip6_forward_finish+0x570/0x570 [ 433.741514][ C1] ? lock_downgrade+0x920/0x920 [ 433.746361][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 433.752584][ C1] ? __kasan_check_read+0x11/0x20 [ 433.757607][ C1] __ip6_finish_output+0x444/0xaa0 [ 433.762727][ C1] ? __ip6_finish_output+0x444/0xaa0 [ 433.768013][ C1] ip6_finish_output+0x38/0x1f0 [ 433.772848][ C1] ip6_output+0x235/0x7f0 [ 433.777163][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 433.782259][ C1] ? __ip6_finish_output+0xaa0/0xaa0 [ 433.787573][ C1] ndisc_send_skb+0xf29/0x14a0 [ 433.792324][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 433.797634][ C1] ? skb_set_owner_w+0x21b/0x320 [ 433.802611][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 433.808316][ C1] ndisc_send_ns+0x3a9/0x850 [ 433.812902][ C1] ? mark_held_locks+0xa4/0xf0 [ 433.818001][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 433.823179][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 433.828458][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 433.833636][ C1] ? trace_hardirqs_on+0x67/0x240 [ 433.838640][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 433.843824][ C1] addrconf_dad_work+0xb88/0x1150 [ 433.848834][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 433.854364][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 433.860323][ C1] ? trace_hardirqs_on+0x67/0x240 [ 433.865335][ C1] process_one_work+0x9af/0x1740 [ 433.870252][ C1] ? __schedule+0x776/0x17a0 [ 433.874831][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 433.880182][ C1] ? lock_acquire+0x190/0x410 [ 433.884849][ C1] worker_thread+0x98/0xe40 [ 433.889332][ C1] ? trace_hardirqs_on+0x67/0x240 [ 433.894345][ C1] kthread+0x361/0x430 [ 433.898396][ C1] ? process_one_work+0x1740/0x1740 [ 433.903594][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 433.909827][ C1] ret_from_fork+0x24/0x30