[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.954157][ T26] audit: type=1800 audit(1568396119.896:25): pid=8523 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.999286][ T26] audit: type=1800 audit(1568396119.896:26): pid=8523 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.042965][ T26] audit: type=1800 audit(1568396119.896:27): pid=8523 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 '10.128.10.8' (ECDSA) to the list of known hosts. syzkaller login: [ 375.304810][ T8676] IPVS: ftp: loaded support on port[0] = 21 [ 375.367787][ T8676] chnl_net:caif_netlink_parms(): no params data found [ 375.395920][ T8676] bridge0: port 1(bridge_slave_0) entered blocking state [ 375.403656][ T8676] bridge0: port 1(bridge_slave_0) entered disabled state [ 375.411617][ T8676] device bridge_slave_0 entered promiscuous mode [ 375.420177][ T8676] bridge0: port 2(bridge_slave_1) entered blocking state [ 375.427292][ T8676] bridge0: port 2(bridge_slave_1) entered disabled state [ 375.435110][ T8676] device bridge_slave_1 entered promiscuous mode [ 375.451660][ T8676] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 375.462087][ T8676] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 375.480679][ T8676] team0: Port device team_slave_0 added [ 375.487894][ T8676] team0: Port device team_slave_1 added [ 375.570885][ T8676] device hsr_slave_0 entered promiscuous mode [ 375.639650][ T8676] device hsr_slave_1 entered promiscuous mode [ 375.717361][ T8676] bridge0: port 2(bridge_slave_1) entered blocking state [ 375.724565][ T8676] bridge0: port 2(bridge_slave_1) entered forwarding state [ 375.732437][ T8676] bridge0: port 1(bridge_slave_0) entered blocking state [ 375.739535][ T8676] bridge0: port 1(bridge_slave_0) entered forwarding state [ 375.774316][ T8676] 8021q: adding VLAN 0 to HW filter on device bond0 [ 375.785576][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 375.805850][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 375.814918][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 375.824003][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 375.835407][ T8676] 8021q: adding VLAN 0 to HW filter on device team0 [ 375.846580][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 375.855173][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 375.862370][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 375.873925][ T8682] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 375.882570][ T8682] bridge0: port 2(bridge_slave_1) entered blocking state [ 375.889722][ T8682] bridge0: port 2(bridge_slave_1) entered forwarding state [ 375.906667][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 375.916104][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 375.926687][ T8682] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 375.939582][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 375.951124][ T8676] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 375.963699][ T8676] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 375.972232][ T8682] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 375.990435][ T8676] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 481.208977][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 481.215717][ C1] rcu: 1-...!: (1 GPs behind) idle=116/1/0x4000000000000002 softirq=9146/9147 fqs=14 [ 481.225460][ C1] (t=10500 jiffies g=7073 q=35) [ 481.230385][ C1] rcu: rcu_preempt kthread starved for 10472 jiffies! g7073 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 481.241463][ C1] rcu: RCU grace-period kthread stack dump: [ 481.247354][ C1] rcu_preempt R running task 29552 10 2 0x80004000 [ 481.255236][ C1] Call Trace: [ 481.258612][ C1] __schedule+0x76e/0x17a0 [ 481.263028][ C1] ? __sched_text_start+0x8/0x8 [ 481.267862][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 481.273651][ C1] ? schedule_timeout+0x47c/0xc50 [ 481.278661][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 481.283932][ C1] schedule+0xd9/0x260 [ 481.287988][ C1] schedule_timeout+0x486/0xc50 [ 481.292823][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 481.298626][ C1] ? usleep_range+0x170/0x170 [ 481.303297][ C1] ? trace_hardirqs_on+0x67/0x240 [ 481.308312][ C1] ? __kasan_check_read+0x11/0x20 [ 481.313322][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 481.318852][ C1] ? swake_up_one+0x60/0x60 [ 481.323341][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 481.328094][ C1] ? invoke_rcu_core+0x230/0x230 [ 481.333020][ C1] ? trace_hardirqs_on+0x67/0x240 [ 481.338024][ C1] ? __kasan_check_read+0x11/0x20 [ 481.343036][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 481.349282][ C1] ? __kthread_parkme+0x108/0x1c0 [ 481.354300][ C1] ? __kasan_check_read+0x11/0x20 [ 481.359318][ C1] kthread+0x361/0x430 [ 481.363390][ C1] ? invoke_rcu_core+0x230/0x230 [ 481.368322][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 481.374547][ C1] ret_from_fork+0x24/0x30 [ 481.378971][ C1] NMI backtrace for cpu 1 [ 481.383286][ C1] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.3.0-rc6-next-20190830 #75 [ 481.391846][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 481.402004][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 481.407964][ C1] Call Trace: [ 481.411227][ C1] [ 481.414159][ C1] dump_stack+0x172/0x1f0 [ 481.418506][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 481.423697][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 481.429924][ C1] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 481.435538][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 481.441503][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 481.447378][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 481.452474][ C1] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 481.458016][ C1] ? raise_softirq+0x138/0x340 [ 481.462766][ C1] update_process_times+0x2d/0x70 [ 481.467771][ C1] tick_sched_handle+0xa2/0x190 [ 481.472603][ C1] tick_sched_timer+0x53/0x140 [ 481.477366][ C1] __hrtimer_run_queues+0x364/0xe40 [ 481.482549][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 481.487817][ C1] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 481.493778][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 481.499480][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 481.505531][ C1] hrtimer_interrupt+0x314/0x770 [ 481.510462][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 481.515990][ C1] apic_timer_interrupt+0xf/0x20 [ 481.520902][ C1] [ 481.523903][ C1] RIP: 0010:hhf_dequeue+0x5d1/0xa20 [ 481.529090][ C1] Code: d2 0f 85 3f 04 00 00 45 0f af b5 14 03 00 00 48 89 df 45 01 fe 44 89 73 10 e8 8b 56 77 fd 31 ff 41 89 c6 89 c6 e8 7f e8 a6 fb <45> 84 f6 74 63 e8 35 e7 a6 fb 48 89 d8 48 c1 e8 03 42 80 3c 20 00 [ 481.548674][ C1] RSP: 0018:ffff8880a9a6ed58 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 481.557068][ C1] RAX: 0000000000000000 RBX: ffff8880969b5af8 RCX: ffffffff85cb6ed1 [ 481.565038][ C1] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 481.572991][ C1] RBP: ffff8880a9a6eda8 R08: ffff8880a9a605c0 R09: fffffbfff14ed341 [ 481.580947][ C1] R10: ffff8880a9a60fc8 R11: ffff8880a9a605c0 R12: dffffc0000000000 [ 481.588902][ C1] R13: ffff8880969b5800 R14: 0000000000000001 R15: 0000000000000000 [ 481.596883][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 481.601472][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 481.606110][ C1] __qdisc_run+0x1e7/0x19d0 [ 481.610612][ C1] ? dev_queue_xmit+0x18/0x20 [ 481.615280][ C1] __dev_queue_xmit+0x16f1/0x37c0 [ 481.620292][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 481.626451][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 481.631733][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 481.638011][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 481.643316][ C1] ? br_forward_finish+0x235/0x400 [ 481.648420][ C1] ? find_held_lock+0x35/0x130 [ 481.653181][ C1] ? br_forward_finish+0x235/0x400 [ 481.658293][ C1] dev_queue_xmit+0x18/0x20 [ 481.662777][ C1] ? dev_queue_xmit+0x18/0x20 [ 481.667436][ C1] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 481.672808][ C1] ? __kasan_check_read+0x11/0x20 [ 481.677816][ C1] br_forward_finish+0xfa/0x400 [ 481.682649][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 481.688178][ C1] ? br_fdb_add.cold+0x83/0x83 [ 481.693010][ C1] ? __kasan_check_read+0x11/0x20 [ 481.698018][ C1] __br_forward+0x641/0xb00 [ 481.702518][ C1] ? br_forward_finish+0x400/0x400 [ 481.707700][ C1] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 481.713231][ C1] deliver_clone+0x61/0xc0 [ 481.717635][ C1] maybe_deliver+0x2c7/0x390 [ 481.722215][ C1] br_flood+0x13a/0x3d0 [ 481.726359][ C1] br_dev_xmit+0x98c/0x15a0 [ 481.730849][ C1] ? br_poll_controller+0x10/0x10 [ 481.735866][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 481.742004][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 481.747541][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 481.753506][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 481.759732][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 481.764838][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 481.771065][ C1] __dev_queue_xmit+0x2b82/0x37c0 [ 481.776078][ C1] ? __kasan_check_read+0x11/0x20 [ 481.781087][ C1] ? __lock_acquire+0x16f2/0x4a00 [ 481.786097][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 481.791364][ C1] ? ip6_finish_output2+0x1034/0x2550 [ 481.796718][ C1] ? __kasan_check_read+0x11/0x20 [ 481.801728][ C1] ? mark_lock+0xc2/0x1220 [ 481.806145][ C1] ? mark_held_locks+0xa4/0xf0 [ 481.810909][ C1] dev_queue_xmit+0x18/0x20 [ 481.815396][ C1] ? dev_queue_xmit+0x18/0x20 [ 481.820135][ C1] neigh_resolve_output+0x5a5/0x970 [ 481.825325][ C1] ip6_finish_output2+0x1034/0x2550 [ 481.830506][ C1] ? ip6_mtu+0x2e6/0x460 [ 481.834734][ C1] ? ip6_forward_finish+0x570/0x570 [ 481.839912][ C1] ? lock_downgrade+0x920/0x920 [ 481.844748][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 481.850986][ C1] ? __kasan_check_read+0x11/0x20 [ 481.855999][ C1] __ip6_finish_output+0x444/0xaa0 [ 481.861093][ C1] ? __ip6_finish_output+0x444/0xaa0 [ 481.866364][ C1] ip6_finish_output+0x38/0x1f0 [ 481.871198][ C1] ip6_output+0x235/0x7f0 [ 481.875512][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 481.880615][ C1] ? __ip6_finish_output+0xaa0/0xaa0 [ 481.885952][ C1] ndisc_send_skb+0xf29/0x14a0 [ 481.890707][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 481.896033][ C1] ? skb_set_owner_w+0x21b/0x320 [ 481.900957][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 481.906675][ C1] ndisc_send_ns+0x3a9/0x850 [ 481.911259][ C1] ? mark_held_locks+0xa4/0xf0 [ 481.916006][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 481.921186][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 481.926462][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 481.931640][ C1] ? trace_hardirqs_on+0x67/0x240 [ 481.936646][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 481.941852][ C1] addrconf_dad_work+0xb88/0x1150 [ 481.946865][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 481.952410][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 481.958382][ C1] ? trace_hardirqs_on+0x67/0x240 [ 481.963393][ C1] process_one_work+0x9af/0x1740 [ 481.968311][ C1] ? __schedule+0x776/0x17a0 [ 481.972888][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 481.978239][ C1] ? lock_acquire+0x190/0x410 [ 481.982908][ C1] worker_thread+0x98/0xe40 [ 481.987404][ C1] ? trace_hardirqs_on+0x67/0x240 [ 481.992418][ C1] kthread+0x361/0x430 [ 481.996480][ C1] ? process_one_work+0x1740/0x1740 [ 482.001662][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 482.007889][ C1] ret_from_fork+0x24/0x30