[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.929881][ T25] audit: type=1800 audit(1568501945.333:25): pid=8504 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.975597][ T25] audit: type=1800 audit(1568501945.333:26): pid=8504 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.005619][ T25] audit: type=1800 audit(1568501945.343:27): pid=8504 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 '10.128.0.252' (ECDSA) to the list of known hosts. syzkaller login: [ 250.183663][ T8657] IPVS: ftp: loaded support on port[0] = 21 [ 250.241313][ T8657] chnl_net:caif_netlink_parms(): no params data found [ 250.270825][ T8657] bridge0: port 1(bridge_slave_0) entered blocking state [ 250.278759][ T8657] bridge0: port 1(bridge_slave_0) entered disabled state [ 250.286776][ T8657] device bridge_slave_0 entered promiscuous mode [ 250.294934][ T8657] bridge0: port 2(bridge_slave_1) entered blocking state [ 250.302191][ T8657] bridge0: port 2(bridge_slave_1) entered disabled state [ 250.310455][ T8657] device bridge_slave_1 entered promiscuous mode [ 250.328537][ T8657] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 250.339159][ T8657] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 250.358075][ T8657] team0: Port device team_slave_0 added [ 250.365365][ T8657] team0: Port device team_slave_1 added [ 250.418120][ T8657] device hsr_slave_0 entered promiscuous mode [ 250.485902][ T8657] device hsr_slave_1 entered promiscuous mode [ 250.544441][ T8657] bridge0: port 2(bridge_slave_1) entered blocking state [ 250.551794][ T8657] bridge0: port 2(bridge_slave_1) entered forwarding state [ 250.559859][ T8657] bridge0: port 1(bridge_slave_0) entered blocking state [ 250.567106][ T8657] bridge0: port 1(bridge_slave_0) entered forwarding state [ 250.601308][ T8657] 8021q: adding VLAN 0 to HW filter on device bond0 [ 250.614946][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 250.637487][ T3014] bridge0: port 1(bridge_slave_0) entered disabled state [ 250.646949][ T3014] bridge0: port 2(bridge_slave_1) entered disabled state [ 250.654903][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 250.666424][ T8657] 8021q: adding VLAN 0 to HW filter on device team0 [ 250.677511][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 250.686245][ T3516] bridge0: port 1(bridge_slave_0) entered blocking state [ 250.693283][ T3516] bridge0: port 1(bridge_slave_0) entered forwarding state [ 250.707802][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 250.716320][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 250.723362][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 250.742777][ T8657] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 250.754300][ T8657] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 250.769661][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 250.778970][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 250.787491][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 250.796588][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program executing program executing program executing program [ 250.805307][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 250.813130][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 250.832878][ T8657] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 355.925487][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 355.932326][ C1] rcu: 1-...!: (1 GPs behind) idle=822/1/0x4000000000000002 softirq=9101/9102 fqs=2 [ 355.942001][ C1] (t=10500 jiffies g=7589 q=101) [ 355.947009][ C1] rcu: rcu_preempt kthread starved for 10495 jiffies! g7589 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 355.958259][ C1] rcu: RCU grace-period kthread stack dump: [ 355.964129][ C1] rcu_preempt I29112 10 2 0x80004000 [ 355.970442][ C1] Call Trace: [ 355.973814][ C1] __schedule+0x755/0x1580 [ 355.978218][ C1] ? __sched_text_start+0x8/0x8 [ 355.983070][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 355.989048][ C1] ? schedule_timeout+0x47c/0xc50 [ 355.994065][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 355.999341][ C1] schedule+0xd9/0x260 [ 356.003396][ C1] schedule_timeout+0x486/0xc50 [ 356.008229][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 356.014022][ C1] ? usleep_range+0x170/0x170 [ 356.018687][ C1] ? trace_hardirqs_on+0x67/0x240 [ 356.023702][ C1] ? __kasan_check_read+0x11/0x20 [ 356.028719][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 356.034245][ C1] ? swake_up_one+0x60/0x60 [ 356.038732][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 356.043479][ C1] ? rcu_barrier+0x310/0x310 [ 356.048050][ C1] ? trace_hardirqs_on+0x67/0x240 [ 356.053051][ C1] ? __kasan_check_read+0x11/0x20 [ 356.058061][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 356.064280][ C1] ? __kthread_parkme+0x108/0x1c0 [ 356.069293][ C1] ? __kasan_check_read+0x11/0x20 [ 356.074308][ C1] kthread+0x361/0x430 [ 356.078357][ C1] ? rcu_barrier+0x310/0x310 [ 356.082939][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 356.089160][ C1] ret_from_fork+0x24/0x30 [ 356.093611][ C1] NMI backtrace for cpu 1 [ 356.097951][ C1] CPU: 1 PID: 3516 Comm: kworker/1:2 Not tainted 5.3.0-rc7+ #0 [ 356.105527][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 356.115634][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 356.122923][ C1] Call Trace: [ 356.126212][ C1] [ 356.129098][ C1] dump_stack+0x172/0x1f0 [ 356.133426][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 356.138606][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.144832][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 356.150446][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 356.156409][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 356.162334][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 356.167712][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 356.173242][ C1] ? raise_softirq+0x138/0x340 [ 356.177997][ C1] update_process_times+0x32/0x80 [ 356.183006][ C1] tick_sched_handle+0xa2/0x190 [ 356.187860][ C1] tick_sched_timer+0x53/0x140 [ 356.192631][ C1] __hrtimer_run_queues+0x364/0xe40 [ 356.197902][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 356.203352][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 356.208886][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 356.214585][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 356.220637][ C1] hrtimer_interrupt+0x314/0x770 [ 356.225630][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 356.231163][ C1] apic_timer_interrupt+0xf/0x20 [ 356.236142][ C1] RIP: 0010:hhf_dequeue+0x6ba/0xa20 [ 356.241327][ C1] Code: e8 03 42 80 3c 20 00 0f 85 08 03 00 00 48 89 d8 49 89 9d 98 03 00 00 48 c1 e8 03 42 80 3c 20 00 0f 85 b4 02 00 00 48 8b 45 c8 <48> 8d 7b 08 48 89 03 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 8d [ 356.261007][ C1] RSP: 0018:ffff8880ae908b48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 356.269401][ C1] RAX: ffff88808c4b63d0 RBX: ffff88808c4b6338 RCX: ffffffff85c7e4d9 [ 356.277528][ C1] RDX: 0000000000000100 RSI: ffffffff85c7e4eb RDI: 0000000000000001 [ 356.285484][ C1] RBP: ffff8880ae908b98 R08: ffff88809cb66200 R09: fffffbfff14e9755 [ 356.293437][ C1] R10: ffff88809cb66bf8 R11: ffff88809cb66200 R12: dffffc0000000000 [ 356.301742][ C1] R13: ffff88808c4b6040 R14: ffff88808c4b63d8 R15: ffff88808c4b63d0 [ 356.310142][ C1] ? apic_timer_interrupt+0xa/0x20 [ 356.315239][ C1] ? hhf_dequeue+0x679/0xa20 [ 356.319808][ C1] ? hhf_dequeue+0x68b/0xa20 [ 356.324476][ C1] ? hhf_dequeue+0x68b/0xa20 [ 356.329098][ C1] __qdisc_run+0x1e7/0x19d0 [ 356.333625][ C1] ? dev_queue_xmit+0x18/0x20 [ 356.338301][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 356.343320][ C1] ? process_backlog+0x206/0x750 [ 356.348241][ C1] ? net_rx_action+0x4d6/0x1080 [ 356.353074][ C1] ? __do_softirq+0x262/0x98c [ 356.357820][ C1] ? do_softirq_own_stack+0x2a/0x40 [ 356.363003][ C1] ? do_softirq.part.0+0x11a/0x170 [ 356.368103][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 356.373449][ C1] ? __skb_ext_put+0xd9/0x210 [ 356.378122][ C1] dev_queue_xmit+0x18/0x20 [ 356.382611][ C1] ? dev_queue_xmit+0x18/0x20 [ 356.387319][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 356.392678][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 356.397353][ C1] ? lock_downgrade+0x920/0x920 [ 356.402246][ C1] br_nf_dev_queue_xmit+0x34e/0x1470 [ 356.407523][ C1] br_nf_post_routing+0x1502/0x1d30 [ 356.412723][ C1] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 356.418254][ C1] ? mark_held_locks+0xf0/0xf0 [ 356.423013][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 356.428803][ C1] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 356.434639][ C1] nf_hook_slow+0xbc/0x1e0 [ 356.439048][ C1] br_forward_finish+0x215/0x400 [ 356.444155][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 356.449688][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 356.454438][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 356.460152][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 356.464730][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 356.469655][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 356.475187][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 356.480284][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 356.485814][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.492038][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 356.497919][ C1] br_nf_forward_finish+0x66c/0xa90 [ 356.503100][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 356.508639][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 356.513586][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 356.518857][ C1] ? mark_held_locks+0xf0/0xf0 [ 356.523603][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 356.528715][ C1] ? __vlan_flush+0x120/0x120 [ 356.533380][ C1] nf_hook_slow+0xbc/0x1e0 [ 356.537783][ C1] __br_forward+0x393/0xb00 [ 356.542284][ C1] ? br_forward_finish+0x400/0x400 [ 356.547393][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 356.552927][ C1] deliver_clone+0x61/0xc0 [ 356.557326][ C1] br_flood+0x325/0x3d0 [ 356.561473][ C1] br_handle_frame_finish+0xb46/0x1670 [ 356.566917][ C1] ? br_handle_local_finish+0x20/0x20 [ 356.572619][ C1] ? audit_alloc_mark+0x3d0/0x500 [ 356.577630][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 356.583334][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 356.587911][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 356.592832][ C1] ? br_handle_local_finish+0x20/0x20 [ 356.598199][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 356.603295][ C1] ? find_held_lock+0x35/0x130 [ 356.608050][ C1] ? br_handle_local_finish+0x20/0x20 [ 356.613406][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 356.619280][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 356.625159][ C1] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 356.631122][ C1] ? br_handle_local_finish+0x20/0x20 [ 356.636477][ C1] ? __kasan_check_read+0x11/0x20 [ 356.641487][ C1] br_nf_pre_routing_ipv6+0x456/0x832 [ 356.646840][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 356.651850][ C1] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 356.657984][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.664207][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 356.670439][ C1] ? skb_pull_rcsum+0x155/0x300 [ 356.675277][ C1] br_nf_pre_routing+0x1743/0x2355 [ 356.680375][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 356.686249][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.692480][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 356.698356][ C1] br_handle_frame+0x806/0x133e [ 356.703199][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 356.708901][ C1] ? try_to_wake_up+0xf3/0x1aa0 [ 356.713734][ C1] ? br_handle_local_finish+0x20/0x20 [ 356.719098][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 356.724815][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 356.730435][ C1] ? __kasan_check_read+0x11/0x20 [ 356.735445][ C1] ? do_xdp_generic+0x50/0x50 [ 356.740113][ C1] ? __kasan_check_read+0x11/0x20 [ 356.745123][ C1] ? __lock_acquire+0x8a2/0x4c30 [ 356.750039][ C1] ? swake_up_one+0x4d/0x60 [ 356.754537][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 356.760325][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 356.766299][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 356.772182][ C1] ? lock_acquire+0x190/0x410 [ 356.776844][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.783071][ C1] __netif_receive_skb+0x2c/0x1d0 [ 356.788084][ C1] process_backlog+0x206/0x750 [ 356.792833][ C1] ? net_rx_action+0x249/0x1080 [ 356.797665][ C1] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 356.802941][ C1] net_rx_action+0x4d6/0x1080 [ 356.807608][ C1] ? napi_busy_loop+0x970/0x970 [ 356.812455][ C1] __do_softirq+0x262/0x98c [ 356.816950][ C1] ? ip6_finish_output2+0x106d/0x2520 [ 356.822306][ C1] do_softirq_own_stack+0x2a/0x40 [ 356.827308][ C1] [ 356.830233][ C1] do_softirq.part.0+0x11a/0x170 [ 356.835155][ C1] __local_bh_enable_ip+0x211/0x270 [ 356.840382][ C1] ip6_finish_output2+0x10a0/0x2520 [ 356.845579][ C1] ? ip6_mtu+0x2e6/0x460 [ 356.849815][ C1] ? ip6_forward_finish+0x530/0x530 [ 356.855002][ C1] ? lock_downgrade+0x920/0x920 [ 356.859844][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 356.866072][ C1] ? __kasan_check_read+0x11/0x20 [ 356.871096][ C1] __ip6_finish_output+0x444/0xa50 [ 356.876798][ C1] ? __ip6_finish_output+0x444/0xa50 [ 356.882069][ C1] ip6_finish_output+0x38/0x1f0 [ 356.886903][ C1] ip6_output+0x235/0x7c0 [ 356.891219][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 356.896315][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 356.901640][ C1] ndisc_send_skb+0xf29/0x1450 [ 356.906396][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 356.911683][ C1] ? skb_set_owner_w+0x21b/0x320 [ 356.916622][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 356.922329][ C1] ndisc_send_ns+0x3a9/0x850 [ 356.926906][ C1] ? mark_held_locks+0xa4/0xf0 [ 356.931749][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 356.936929][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 356.942215][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 356.947394][ C1] ? trace_hardirqs_on+0x67/0x240 [ 356.952403][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 356.957587][ C1] addrconf_dad_work+0xb88/0x1150 [ 356.962611][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 356.968149][ C1] process_one_work+0x9af/0x1740 [ 356.973077][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 356.978428][ C1] ? lock_acquire+0x190/0x410 [ 356.983132][ C1] worker_thread+0x98/0xe40 [ 356.987650][ C1] ? trace_hardirqs_on+0x67/0x240 [ 356.992681][ C1] kthread+0x361/0x430 [ 356.996745][ C1] ? process_one_work+0x1740/0x1740 [ 357.001941][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 357.008167][ C1] ret_from_fork+0x24/0x30