[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.300554][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 60.300564][ T26] audit: type=1800 audit(1568282907.339:29): pid=9627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 60.326831][ T26] audit: type=1800 audit(1568282907.339:30): pid=9627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.78' (ECDSA) to the list of known hosts. syzkaller login: [ 184.010104][ T9777] IPVS: ftp: loaded support on port[0] = 21 [ 184.051763][ T9777] chnl_net:caif_netlink_parms(): no params data found [ 184.073057][ T9777] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.080550][ T9777] bridge0: port 1(bridge_slave_0) entered disabled state [ 184.088022][ T9777] device bridge_slave_0 entered promiscuous mode [ 184.095102][ T9777] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.102223][ T9777] bridge0: port 2(bridge_slave_1) entered disabled state [ 184.109709][ T9777] device bridge_slave_1 entered promiscuous mode [ 184.123579][ T9777] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 184.134025][ T9777] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 184.149758][ T9777] team0: Port device team_slave_0 added [ 184.156380][ T9777] team0: Port device team_slave_1 added [ 184.207352][ T9777] device hsr_slave_0 entered promiscuous mode [ 184.275935][ T9777] device hsr_slave_1 entered promiscuous mode [ 184.350618][ T9777] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.357755][ T9777] bridge0: port 2(bridge_slave_1) entered forwarding state [ 184.365013][ T9777] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.372119][ T9777] bridge0: port 1(bridge_slave_0) entered forwarding state [ 184.396047][ T9777] 8021q: adding VLAN 0 to HW filter on device bond0 [ 184.407753][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 184.416048][ T2841] bridge0: port 1(bridge_slave_0) entered disabled state [ 184.423361][ T2841] bridge0: port 2(bridge_slave_1) entered disabled state [ 184.431188][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 184.440939][ T9777] 8021q: adding VLAN 0 to HW filter on device team0 [ 184.450679][ T2620] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 184.459121][ T2620] bridge0: port 1(bridge_slave_0) entered blocking state [ 184.466188][ T2620] bridge0: port 1(bridge_slave_0) entered forwarding state [ 184.484360][ T9777] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 184.494957][ T9777] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 184.507482][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 184.516285][ T2841] bridge0: port 2(bridge_slave_1) entered blocking state [ 184.523312][ T2841] bridge0: port 2(bridge_slave_1) entered forwarding state [ 184.531316][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 184.540801][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 184.549064][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 184.557177][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 184.565565][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 184.573205][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 184.587299][ T9777] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 289.605635][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 289.612421][ C0] rcu: 0-...!: (10499 ticks this GP) idle=90e/1/0x4000000000000002 softirq=9348/9348 fqs=8 [ 289.622547][ C0] (t=10501 jiffies g=9181 q=92) [ 289.627464][ C0] rcu: rcu_preempt kthread starved for 10486 jiffies! g9181 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 289.638535][ C0] rcu: RCU grace-period kthread stack dump: [ 289.644404][ C0] rcu_preempt R running task 29320 10 2 0x80004000 [ 289.652282][ C0] Call Trace: [ 289.655611][ C0] __schedule+0x755/0x1580 [ 289.660015][ C0] ? __sched_text_start+0x8/0x8 [ 289.664850][ C0] schedule+0xd9/0x260 [ 289.668899][ C0] schedule_timeout+0x486/0xc50 [ 289.673730][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 289.678645][ C0] ? usleep_range+0x170/0x170 [ 289.683296][ C0] ? trace_hardirqs_on+0x67/0x240 [ 289.688313][ C0] ? __kasan_check_read+0x11/0x20 [ 289.693318][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 289.698840][ C0] ? swake_up_one+0x60/0x60 [ 289.703322][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 289.708064][ C0] ? rcu_barrier+0x310/0x310 [ 289.712629][ C0] ? trace_hardirqs_on+0x67/0x240 [ 289.717642][ C0] ? __kasan_check_read+0x11/0x20 [ 289.722645][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 289.728864][ C0] ? __kthread_parkme+0x108/0x1c0 [ 289.733876][ C0] ? __kasan_check_read+0x11/0x20 [ 289.738880][ C0] kthread+0x361/0x430 [ 289.742927][ C0] ? rcu_barrier+0x310/0x310 [ 289.747496][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 289.753715][ C0] ret_from_fork+0x24/0x30 [ 289.758167][ C0] NMI backtrace for cpu 0 [ 289.762480][ C0] CPU: 0 PID: 2620 Comm: kworker/0:2 Not tainted 5.3.0-rc8+ #0 [ 289.769996][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 289.780093][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 289.786059][ C0] Call Trace: [ 289.789319][ C0] [ 289.792172][ C0] dump_stack+0x172/0x1f0 [ 289.796483][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 289.801746][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 289.807967][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 289.813578][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 289.819540][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 289.825423][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 289.830516][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 289.836039][ C0] ? raise_softirq+0x138/0x340 [ 289.840782][ C0] update_process_times+0x32/0x80 [ 289.845785][ C0] tick_sched_handle+0xa2/0x190 [ 289.850615][ C0] tick_sched_timer+0x53/0x140 [ 289.855359][ C0] __hrtimer_run_queues+0x364/0xe40 [ 289.860544][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 289.865822][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 289.871359][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 289.877061][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 289.883106][ C0] hrtimer_interrupt+0x314/0x770 [ 289.888066][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 289.893595][ C0] apic_timer_interrupt+0xf/0x20 [ 289.898543][ C0] RIP: 0010:hhf_dequeue+0x513/0xa20 [ 289.903739][ C0] Code: 08 48 c1 e8 03 42 80 3c 20 00 0f 85 12 04 00 00 49 89 1f e9 4b fb ff ff e8 6a 15 ac fb 48 8b 45 b8 4c 8b 75 c8 42 80 3c 20 00 <0f> 85 3a 04 00 00 49 8b 85 90 03 00 00 48 39 45 c8 0f 85 4b fb ff [ 289.923407][ C0] RSP: 0018:ffff8880ae808b48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 289.931796][ C0] RAX: 1ffff110117afd02 RBX: ffff88808bd7e778 RCX: ffffffff85c660f9 [ 289.939760][ C0] RDX: 0000000000000100 RSI: ffffffff85c65f86 RDI: ffff88808bd7e780 [ 289.947722][ C0] RBP: ffff8880ae808b98 R08: ffff8880a23ac2c0 R09: 0000000000000000 [ 289.955673][ C0] R10: fffffbfff134afaf R11: ffff8880a23ac2c0 R12: dffffc0000000000 [ 289.963622][ C0] R13: ffff88808bd7e480 R14: ffff88808bd7e810 R15: ffff88808bd7e810 [ 289.971579][ C0] ? apic_timer_interrupt+0xa/0x20 [ 289.976685][ C0] ? hhf_dequeue+0x679/0xa20 [ 289.981265][ C0] ? hhf_dequeue+0x506/0xa20 [ 289.985834][ C0] ? hhf_dequeue+0x506/0xa20 [ 289.990463][ C0] __qdisc_run+0x1e7/0x19d0 [ 289.994965][ C0] ? dev_queue_xmit+0x18/0x20 [ 289.999624][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 290.004629][ C0] ? process_backlog+0x206/0x750 [ 290.009544][ C0] ? net_rx_action+0x4d6/0x1030 [ 290.014377][ C0] ? __do_softirq+0x262/0x98c [ 290.019047][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 290.024224][ C0] ? do_softirq.part.0+0x11a/0x170 [ 290.029317][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 290.034582][ C0] ? quarantine_put+0x11c/0x1c0 [ 290.039413][ C0] ? trace_hardirqs_on+0x67/0x240 [ 290.044464][ C0] ? __skb_ext_put+0xd9/0x210 [ 290.049119][ C0] dev_queue_xmit+0x18/0x20 [ 290.053599][ C0] ? dev_queue_xmit+0x18/0x20 [ 290.058291][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 290.063644][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 290.068325][ C0] ? lock_downgrade+0x920/0x920 [ 290.073181][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 290.078459][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 290.084158][ C0] br_nf_post_routing+0x1502/0x1d30 [ 290.089341][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 290.094881][ C0] ? mark_held_locks+0xf0/0xf0 [ 290.099621][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 290.105406][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 290.111239][ C0] nf_hook_slow+0xbc/0x1e0 [ 290.115637][ C0] br_forward_finish+0x215/0x400 [ 290.120551][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 290.126076][ C0] ? process_one_work+0x9af/0x1740 [ 290.131170][ C0] ? worker_thread+0x98/0xe40 [ 290.135824][ C0] ? kthread+0x361/0x430 [ 290.140044][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 290.144836][ C0] ? ip_vs_out+0x244/0x1700 [ 290.149334][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 290.155050][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 290.159622][ C0] ? should_fail+0x1de/0x852 [ 290.164190][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 290.169105][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 290.174629][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 290.179716][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 290.185235][ C0] ? br_nf_forward_finish+0x176/0xa90 [ 290.190584][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 290.196454][ C0] br_nf_forward_finish+0x66c/0xa90 [ 290.201629][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 290.207274][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 290.212197][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 290.217466][ C0] ? mark_held_locks+0xf0/0xf0 [ 290.222213][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 290.227391][ C0] ? __vlan_flush+0x120/0x120 [ 290.232061][ C0] nf_hook_slow+0xbc/0x1e0 [ 290.236460][ C0] __br_forward+0x393/0xb00 [ 290.240946][ C0] ? br_forward_finish+0x400/0x400 [ 290.246034][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 290.251560][ C0] deliver_clone+0x61/0xc0 [ 290.255957][ C0] br_flood+0x325/0x3d0 [ 290.260093][ C0] br_handle_frame_finish+0xb46/0x1670 [ 290.265533][ C0] ? br_handle_local_finish+0x20/0x20 [ 290.270883][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 290.276235][ C0] ? audit_alloc_mark+0x430/0x500 [ 290.281240][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 290.286947][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 290.291516][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 290.296434][ C0] ? br_handle_local_finish+0x20/0x20 [ 290.301781][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 290.306976][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 290.313193][ C0] ? br_handle_local_finish+0x20/0x20 [ 290.318544][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 290.324413][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 290.330306][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 290.336277][ C0] ? br_handle_local_finish+0x20/0x20 [ 290.341633][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 290.346983][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 290.351991][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 290.358124][ C0] ? br_nf_pre_routing+0x246/0x2355 [ 290.363305][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 290.369543][ C0] ? skb_pull_rcsum+0x155/0x300 [ 290.374389][ C0] br_nf_pre_routing+0x1743/0x2355 [ 290.379499][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 290.385375][ C0] ? arch_stack_walk+0x81/0xf0 [ 290.390124][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 290.396003][ C0] br_handle_frame+0x806/0x133e [ 290.400839][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 290.406544][ C0] ? br_handle_local_finish+0x20/0x20 [ 290.411911][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 290.418128][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 290.423836][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 290.429447][ C0] ? irq_exit+0x19b/0x1e0 [ 290.433771][ C0] ? smp_apic_timer_interrupt+0x1a3/0x610 [ 290.439467][ C0] ? apic_timer_interrupt+0xf/0x20 [ 290.444556][ C0] ? native_safe_halt+0xe/0x10 [ 290.449300][ C0] ? arch_cpu_idle+0xa/0x10 [ 290.453782][ C0] ? rest_init+0x245/0x37b [ 290.458265][ C0] ? parse_early_param+0x5f/0x11a [ 290.463396][ C0] ? do_xdp_generic+0x50/0x50 [ 290.468058][ C0] ? __kasan_check_read+0x11/0x20 [ 290.473064][ C0] ? __kasan_check_write+0x14/0x20 [ 290.478155][ C0] ? lock_downgrade+0x920/0x920 [ 290.482987][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 290.487906][ C0] ? debug_check_no_obj_freed+0xc0/0x43f [ 290.493526][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 290.499309][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 290.505263][ C0] ? __kasan_check_write+0x14/0x20 [ 290.510350][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 290.516220][ C0] ? lock_acquire+0x190/0x410 [ 290.520874][ C0] ? process_backlog+0x195/0x750 [ 290.525791][ C0] __netif_receive_skb+0x2c/0x1d0 [ 290.530793][ C0] process_backlog+0x206/0x750 [ 290.535535][ C0] ? __kasan_check_read+0x11/0x20 [ 290.540540][ C0] net_rx_action+0x4d6/0x1030 [ 290.545200][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 290.550376][ C0] ? sched_clock+0x2e/0x50 [ 290.554770][ C0] ? ip6_finish_output2+0x106d/0x2520 [ 290.560121][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 290.566341][ C0] __do_softirq+0x262/0x98c [ 290.570823][ C0] ? ip6_finish_output2+0x106d/0x2520 [ 290.576173][ C0] do_softirq_own_stack+0x2a/0x40 [ 290.581170][ C0] [ 290.584089][ C0] do_softirq.part.0+0x11a/0x170 [ 290.589019][ C0] __local_bh_enable_ip+0x211/0x270 [ 290.594196][ C0] ip6_finish_output2+0x10a0/0x2520 [ 290.599375][ C0] ? ip6_mtu+0x2e6/0x460 [ 290.603610][ C0] ? ip6_forward_finish+0x530/0x530 [ 290.608800][ C0] ? lock_downgrade+0x920/0x920 [ 290.613629][ C0] ? ip6_mtu+0x16f/0x460 [ 290.617852][ C0] __ip6_finish_output+0x444/0xa50 [ 290.622941][ C0] ? __ip6_finish_output+0x444/0xa50 [ 290.628207][ C0] ip6_finish_output+0x38/0x1f0 [ 290.633049][ C0] ip6_output+0x235/0x7c0 [ 290.637372][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 290.642460][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 290.647789][ C0] ? ndisc_send_skb+0x803/0x1450 [ 290.652710][ C0] ndisc_send_skb+0xf29/0x1450 [ 290.657459][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 290.662724][ C0] ? skb_set_owner_w+0x21b/0x320 [ 290.667642][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 290.673340][ C0] ndisc_send_ns+0x3a9/0x850 [ 290.677923][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 290.684141][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 290.689328][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 290.694508][ C0] ? trace_hardirqs_on+0x67/0x240 [ 290.699514][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 290.704693][ C0] addrconf_dad_work+0xb88/0x1150 [ 290.709698][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 290.715221][ C0] ? lock_acquire+0x190/0x410 [ 290.719877][ C0] ? trace_hardirqs_on+0x67/0x240 [ 290.724880][ C0] process_one_work+0x9af/0x1740 [ 290.729801][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 290.735152][ C0] ? lock_acquire+0x190/0x410 [ 290.739811][ C0] worker_thread+0x98/0xe40 [ 290.744291][ C0] ? trace_hardirqs_on+0x67/0x240 [ 290.749658][ C0] kthread+0x361/0x430 [ 290.753705][ C0] ? process_one_work+0x1740/0x1740 [ 290.758882][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 290.765101][ C0] ret_from_fork+0x24/0x30