[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 53.417036][ T26] audit: type=1800 audit(1568489152.183:25): pid=8492 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 53.439059][ T26] audit: type=1800 audit(1568489152.183:26): pid=8492 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 53.487448][ T26] audit: type=1800 audit(1568489152.183:27): pid=8492 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 '10.128.0.192' (ECDSA) to the list of known hosts. syzkaller login: [ 64.865378][ T8644] IPVS: ftp: loaded support on port[0] = 21 [ 64.918354][ T8644] chnl_net:caif_netlink_parms(): no params data found [ 64.944645][ T8644] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.952021][ T8644] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.959794][ T8644] device bridge_slave_0 entered promiscuous mode [ 64.967554][ T8644] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.974730][ T8644] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.982240][ T8644] device bridge_slave_1 entered promiscuous mode [ 64.998597][ T8644] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 65.009016][ T8644] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 65.027697][ T8644] team0: Port device team_slave_0 added [ 65.034602][ T8644] team0: Port device team_slave_1 added [ 65.106243][ T8644] device hsr_slave_0 entered promiscuous mode [ 65.144625][ T8644] device hsr_slave_1 entered promiscuous mode [ 65.191939][ T8644] bridge0: port 2(bridge_slave_1) entered blocking state [ 65.199111][ T8644] bridge0: port 2(bridge_slave_1) entered forwarding state [ 65.206815][ T8644] bridge0: port 1(bridge_slave_0) entered blocking state [ 65.213902][ T8644] bridge0: port 1(bridge_slave_0) entered forwarding state [ 65.246470][ T8644] 8021q: adding VLAN 0 to HW filter on device bond0 [ 65.258828][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 65.279009][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 65.287388][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 65.296245][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 65.307963][ T8644] 8021q: adding VLAN 0 to HW filter on device team0 [ 65.318017][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 65.326624][ T3771] bridge0: port 1(bridge_slave_0) entered blocking state [ 65.333661][ T3771] bridge0: port 1(bridge_slave_0) entered forwarding state [ 65.343596][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 65.352771][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 65.359861][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 65.376087][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 65.391014][ T8644] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 65.401964][ T8644] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 65.413775][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 65.421938][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 65.430393][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 65.439283][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 65.447750][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 65.465065][ T8644] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 170.523955][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 170.530696][ C0] rcu: 0-...!: (1 GPs behind) idle=57a/1/0x4000000000000002 softirq=8180/8181 fqs=20 [ 170.540436][ C0] (t=10501 jiffies g=6733 q=63) [ 170.545361][ C0] rcu: rcu_preempt kthread starved for 10460 jiffies! g6733 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 170.556609][ C0] rcu: RCU grace-period kthread stack dump: [ 170.562481][ C0] rcu_preempt I29368 10 2 0x80004000 [ 170.568810][ C0] Call Trace: [ 170.572100][ C0] __schedule+0x76e/0x17a0 [ 170.576503][ C0] ? __sched_text_start+0x8/0x8 [ 170.581337][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 170.587128][ C0] ? schedule_timeout+0x47c/0xc50 [ 170.592139][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 170.597411][ C0] schedule+0xd9/0x260 [ 170.601464][ C0] schedule_timeout+0x486/0xc50 [ 170.606306][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 170.612102][ C0] ? usleep_range+0x170/0x170 [ 170.616761][ C0] ? trace_hardirqs_on+0x67/0x240 [ 170.621762][ C0] ? __kasan_check_read+0x11/0x20 [ 170.626786][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 170.632316][ C0] ? swake_up_one+0x60/0x60 [ 170.636918][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 170.641665][ C0] ? invoke_rcu_core+0x230/0x230 [ 170.646582][ C0] ? trace_hardirqs_on+0x67/0x240 [ 170.651587][ C0] ? __kasan_check_read+0x11/0x20 [ 170.656597][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 170.662816][ C0] ? __kthread_parkme+0x108/0x1c0 [ 170.667821][ C0] ? __kasan_check_read+0x11/0x20 [ 170.672829][ C0] kthread+0x361/0x430 [ 170.676880][ C0] ? invoke_rcu_core+0x230/0x230 [ 170.681812][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 170.688036][ C0] ret_from_fork+0x24/0x30 [ 170.692493][ C0] NMI backtrace for cpu 0 [ 170.696807][ C0] CPU: 0 PID: 8646 Comm: kworker/0:3 Not tainted 5.3.0-rc6-next-20190830 #75 [ 170.705540][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 170.715590][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 170.721545][ C0] Call Trace: [ 170.724808][ C0] [ 170.727643][ C0] dump_stack+0x172/0x1f0 [ 170.731956][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 170.737136][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 170.743360][ C0] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 170.748973][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 170.754935][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 170.760807][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 170.765917][ C0] rcu_sched_clock_irq.cold+0x4fd/0xc12 [ 170.771447][ C0] ? raise_softirq+0x138/0x340 [ 170.776199][ C0] update_process_times+0x2d/0x70 [ 170.781204][ C0] tick_sched_handle+0xa2/0x190 [ 170.786055][ C0] tick_sched_timer+0x53/0x140 [ 170.790800][ C0] __hrtimer_run_queues+0x364/0xe40 [ 170.795982][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 170.801264][ C0] ? hrtimer_sleeper_start_expires+0x90/0x90 [ 170.807240][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 170.812939][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 170.818988][ C0] hrtimer_interrupt+0x314/0x770 [ 170.823916][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 170.829459][ C0] apic_timer_interrupt+0xf/0x20 [ 170.834372][ C0] [ 170.837294][ C0] RIP: 0010:hhf_dequeue+0x5a6/0xa20 [ 170.842473][ C0] Code: b5 ac 03 00 00 e8 8a e7 a6 fb 49 8d bd 14 03 00 00 48 89 f8 48 c1 e8 03 42 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 3f 04 00 00 45 0f af b5 14 03 00 00 48 89 df 45 01 fe [ 170.862055][ C0] RSP: 0018:ffff888099ec6d58 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 170.870474][ C0] RAX: 0000000000000007 RBX: ffff88809eaa22f8 RCX: ffffffff85cb69b9 [ 170.878425][ C0] RDX: 0000000000000000 RSI: ffffffff85cb6e86 RDI: ffff88809eaa2314 [ 170.886385][ C0] RBP: ffff888099ec6da8 R08: ffff8880a2e88340 R09: fffffbfff14ed341 [ 170.894342][ C0] R10: ffff8880a2e88d48 R11: ffff8880a2e88340 R12: dffffc0000000000 [ 170.902304][ C0] R13: ffff88809eaa2000 R14: 0000000000000002 R15: 0000000000000000 [ 170.910281][ C0] ? hhf_dequeue+0xb9/0xa20 [ 170.914765][ C0] ? hhf_dequeue+0x586/0xa20 [ 170.919350][ C0] ? hhf_dequeue+0x586/0xa20 [ 170.923929][ C0] __qdisc_run+0x1e7/0x19d0 [ 170.928419][ C0] ? dev_queue_xmit+0x18/0x20 [ 170.933083][ C0] __dev_queue_xmit+0x16f1/0x37c0 [ 170.938094][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 170.944231][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 170.949505][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 170.955726][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 170.960996][ C0] ? br_forward_finish+0x235/0x400 [ 170.966088][ C0] ? find_held_lock+0x35/0x130 [ 170.970834][ C0] ? br_forward_finish+0x235/0x400 [ 170.975933][ C0] dev_queue_xmit+0x18/0x20 [ 170.980417][ C0] ? dev_queue_xmit+0x18/0x20 [ 170.985078][ C0] br_dev_queue_push_xmit+0x3f3/0x5e0 [ 170.990431][ C0] ? __kasan_check_read+0x11/0x20 [ 170.995437][ C0] br_forward_finish+0xfa/0x400 [ 171.000281][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 171.005825][ C0] ? br_fdb_add.cold+0x83/0x83 [ 171.010584][ C0] ? __kasan_check_read+0x11/0x20 [ 171.015603][ C0] __br_forward+0x641/0xb00 [ 171.020104][ C0] ? br_forward_finish+0x400/0x400 [ 171.025224][ C0] ? br_dev_queue_push_xmit+0x5e0/0x5e0 [ 171.030754][ C0] deliver_clone+0x61/0xc0 [ 171.035154][ C0] maybe_deliver+0x2c7/0x390 [ 171.039727][ C0] br_flood+0x13a/0x3d0 [ 171.043870][ C0] br_dev_xmit+0x98c/0x15a0 [ 171.048370][ C0] ? br_poll_controller+0x10/0x10 [ 171.053374][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 171.059511][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 171.065040][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 171.071178][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 171.077400][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 171.082496][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 171.088738][ C0] __dev_queue_xmit+0x2b82/0x37c0 [ 171.093744][ C0] ? __kasan_check_read+0x11/0x20 [ 171.098751][ C0] ? __lock_acquire+0x16f2/0x4a00 [ 171.103761][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 171.109041][ C0] ? ip6_finish_output2+0x1034/0x2550 [ 171.114408][ C0] ? __kasan_check_read+0x11/0x20 [ 171.119413][ C0] ? mark_lock+0xc2/0x1220 [ 171.123815][ C0] ? mark_held_locks+0xa4/0xf0 [ 171.128568][ C0] dev_queue_xmit+0x18/0x20 [ 171.133069][ C0] ? dev_queue_xmit+0x18/0x20 [ 171.137729][ C0] neigh_resolve_output+0x5a5/0x970 [ 171.142915][ C0] ip6_finish_output2+0x1034/0x2550 [ 171.148099][ C0] ? ip6_forward_finish+0x570/0x570 [ 171.153292][ C0] ? lock_downgrade+0x920/0x920 [ 171.158128][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 171.164352][ C0] ? __kasan_check_read+0x11/0x20 [ 171.169362][ C0] __ip6_finish_output+0x444/0xaa0 [ 171.174453][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 171.179721][ C0] ip6_finish_output+0x38/0x1f0 [ 171.184570][ C0] ip6_output+0x235/0x7f0 [ 171.188880][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 171.193975][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 171.199245][ C0] ndisc_send_skb+0xf29/0x14a0 [ 171.203995][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 171.209267][ C0] ? skb_set_owner_w+0x21b/0x320 [ 171.214189][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 171.219888][ C0] ndisc_send_ns+0x3a9/0x850 [ 171.224460][ C0] ? mark_held_locks+0xa4/0xf0 [ 171.229206][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 171.234384][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 171.239651][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 171.244844][ C0] ? trace_hardirqs_on+0x67/0x240 [ 171.249863][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 171.255048][ C0] addrconf_dad_work+0xb88/0x1150 [ 171.260059][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 171.265589][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 171.271576][ C0] ? trace_hardirqs_on+0x67/0x240 [ 171.276587][ C0] process_one_work+0x9af/0x1740 [ 171.281505][ C0] ? __schedule+0x776/0x17a0 [ 171.286086][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 171.291436][ C0] ? lock_acquire+0x190/0x410 [ 171.296115][ C0] worker_thread+0x98/0xe40 [ 171.300600][ C0] ? trace_hardirqs_on+0x67/0x240 [ 171.305613][ C0] kthread+0x361/0x430 [ 171.309663][ C0] ? process_one_work+0x1740/0x1740 [ 171.314840][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 171.321075][ C0] ret_from_fork+0x24/0x30