[....] 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. [ 65.875393][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 65.875403][ T26] audit: type=1800 audit(1568276452.652:29): pid=9759 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 [ 65.907580][ T26] audit: type=1800 audit(1568276452.662:30): pid=9759 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 '10.128.0.139' (ECDSA) to the list of known hosts. syzkaller login: [ 109.594606][ T9915] IPVS: ftp: loaded support on port[0] = 21 [ 109.636170][ T9915] chnl_net:caif_netlink_parms(): no params data found [ 109.657697][ T9915] bridge0: port 1(bridge_slave_0) entered blocking state [ 109.665601][ T9915] bridge0: port 1(bridge_slave_0) entered disabled state [ 109.674217][ T9915] device bridge_slave_0 entered promiscuous mode [ 109.682274][ T9915] bridge0: port 2(bridge_slave_1) entered blocking state [ 109.691764][ T9915] bridge0: port 2(bridge_slave_1) entered disabled state [ 109.699288][ T9915] device bridge_slave_1 entered promiscuous mode [ 109.713790][ T9915] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 109.724090][ T9915] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 109.739956][ T9915] team0: Port device team_slave_0 added [ 109.746649][ T9915] team0: Port device team_slave_1 added [ 109.799897][ T9915] device hsr_slave_0 entered promiscuous mode [ 109.838581][ T9915] device hsr_slave_1 entered promiscuous mode [ 109.913281][ T9915] bridge0: port 2(bridge_slave_1) entered blocking state [ 109.920489][ T9915] bridge0: port 2(bridge_slave_1) entered forwarding state [ 109.928867][ T9915] bridge0: port 1(bridge_slave_0) entered blocking state [ 109.935988][ T9915] bridge0: port 1(bridge_slave_0) entered forwarding state [ 109.960781][ T9915] 8021q: adding VLAN 0 to HW filter on device bond0 [ 109.971687][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 109.979988][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 109.987845][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 109.995776][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 110.005429][ T9915] 8021q: adding VLAN 0 to HW filter on device team0 [ 110.015323][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 110.023783][ T3517] bridge0: port 1(bridge_slave_0) entered blocking state [ 110.030836][ T3517] bridge0: port 1(bridge_slave_0) entered forwarding state [ 110.040838][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 110.049248][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 110.056275][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 110.073688][ T9915] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 110.084120][ T9915] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 110.096350][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 110.105138][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 110.113662][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 110.121892][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 110.130035][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 110.137547][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 110.151553][ T9915] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 215.188197][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 215.194832][ C1] rcu: 1-...!: (1 GPs behind) idle=d86/1/0x4000000000000002 softirq=9049/9050 fqs=5 [ 215.204368][ C1] (t=10501 jiffies g=9337 q=87) [ 215.209287][ C1] rcu: rcu_preempt kthread starved for 10492 jiffies! g9337 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 215.220356][ C1] rcu: RCU grace-period kthread stack dump: [ 215.226238][ C1] rcu_preempt R running task 29320 10 2 0x80004000 [ 215.234131][ C1] Call Trace: [ 215.237426][ C1] __schedule+0x755/0x1580 [ 215.241844][ C1] ? __sched_text_start+0x8/0x8 [ 215.246682][ C1] schedule+0xd9/0x260 [ 215.250733][ C1] schedule_timeout+0x486/0xc50 [ 215.255563][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 215.261004][ C1] ? usleep_range+0x170/0x170 [ 215.265746][ C1] ? trace_hardirqs_on+0x67/0x240 [ 215.271028][ C1] ? __kasan_check_read+0x11/0x20 [ 215.276048][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 215.282271][ C1] ? swake_up_one+0x60/0x60 [ 215.286953][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 215.291698][ C1] ? rcu_barrier+0x310/0x310 [ 215.296279][ C1] ? trace_hardirqs_on+0x67/0x240 [ 215.301283][ C1] ? __kasan_check_read+0x11/0x20 [ 215.306305][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 215.312611][ C1] ? __kthread_parkme+0x108/0x1c0 [ 215.317614][ C1] ? __kasan_check_read+0x11/0x20 [ 215.322617][ C1] kthread+0x361/0x430 [ 215.326668][ C1] ? rcu_barrier+0x310/0x310 [ 215.331250][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 215.337471][ C1] ret_from_fork+0x24/0x30 [ 215.341961][ C1] NMI backtrace for cpu 1 [ 215.346271][ C1] CPU: 1 PID: 3517 Comm: kworker/1:2 Not tainted 5.3.0-rc8+ #0 [ 215.353788][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 215.363835][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 215.369805][ C1] Call Trace: [ 215.373068][ C1] [ 215.375913][ C1] dump_stack+0x172/0x1f0 [ 215.380240][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 215.386056][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 215.392284][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 215.397897][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 215.403860][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 215.409749][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 215.414842][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 215.420472][ C1] ? raise_softirq+0x138/0x340 [ 215.425219][ C1] update_process_times+0x32/0x80 [ 215.430228][ C1] tick_sched_handle+0xa2/0x190 [ 215.435074][ C1] tick_sched_timer+0x53/0x140 [ 215.439820][ C1] __hrtimer_run_queues+0x364/0xe40 [ 215.444999][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 215.450278][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 215.455806][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 215.461529][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 215.467575][ C1] hrtimer_interrupt+0x314/0x770 [ 215.472499][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 215.478036][ C1] apic_timer_interrupt+0xf/0x20 [ 215.482967][ C1] RIP: 0010:hhf_dequeue+0x501/0xa20 [ 215.488146][ C1] Code: 03 42 80 3c 20 00 0f 85 35 04 00 00 4c 89 f8 4c 89 7b 08 48 c1 e8 03 42 80 3c 20 00 0f 85 12 04 00 00 49 89 1f e9 4b fb ff ff 6a 15 ac fb 48 8b 45 b8 4c 8b 75 c8 42 80 3c 20 00 0f 85 3a 04 [ 215.507727][ C1] RSP: 0018:ffff8880ae908b48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 215.516116][ C1] RAX: ffff88809892fe80 RBX: ffff88809892fdf8 RCX: ffffffff85c660f9 [ 215.524088][ C1] RDX: 0000000000000100 RSI: ffff88809892fe80 RDI: ffff88809892fe00 [ 215.532040][ C1] RBP: ffff8880ae908b98 R08: ffff88809cbe8240 R09: 0000000000000000 [ 215.539994][ C1] R10: fffffbfff134afaf R11: ffff88809cbe8240 R12: dffffc0000000000 [ 215.547945][ C1] R13: ffff88809892fb00 R14: ffff88809892fe80 R15: ffff88809892fe90 [ 215.555918][ C1] ? apic_timer_interrupt+0xa/0x20 [ 215.561018][ C1] ? hhf_dequeue+0x679/0xa20 [ 215.565617][ C1] ? hhf_dequeue+0x51/0xa20 [ 215.570117][ C1] __qdisc_run+0x1e7/0x19d0 [ 215.574614][ C1] ? dev_queue_xmit+0x18/0x20 [ 215.579304][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 215.584318][ C1] ? process_backlog+0x206/0x750 [ 215.589237][ C1] ? net_rx_action+0x4d6/0x1030 [ 215.594073][ C1] ? __do_softirq+0x262/0x98c [ 215.598732][ C1] ? do_softirq_own_stack+0x2a/0x40 [ 215.603911][ C1] ? do_softirq.part.0+0x11a/0x170 [ 215.609006][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 215.614275][ C1] ? quarantine_put+0x11c/0x1c0 [ 215.619106][ C1] ? trace_hardirqs_on+0x67/0x240 [ 215.624124][ C1] ? __skb_ext_put+0xd9/0x210 [ 215.628783][ C1] dev_queue_xmit+0x18/0x20 [ 215.633266][ C1] ? dev_queue_xmit+0x18/0x20 [ 215.637922][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 215.643273][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 215.647931][ C1] ? lock_downgrade+0x920/0x920 [ 215.653123][ C1] br_nf_dev_queue_xmit+0x34e/0x1470 [ 215.658389][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 215.664086][ C1] br_nf_post_routing+0x1502/0x1d30 [ 215.669267][ C1] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 215.674968][ C1] ? mark_held_locks+0xf0/0xf0 [ 215.679734][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 215.685693][ C1] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 215.691482][ C1] nf_hook_slow+0xbc/0x1e0 [ 215.695880][ C1] br_forward_finish+0x215/0x400 [ 215.700810][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 215.706332][ C1] ? process_one_work+0x9af/0x1740 [ 215.711421][ C1] ? worker_thread+0x98/0xe40 [ 215.716074][ C1] ? kthread+0x361/0x430 [ 215.720308][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 215.725064][ C1] ? ip_vs_out+0x244/0x1700 [ 215.729549][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 215.735259][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 215.739829][ C1] ? should_fail+0x1de/0x852 [ 215.744399][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 215.749317][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 215.754841][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 215.759943][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 215.765639][ C1] ? br_nf_forward_finish+0x176/0xa90 [ 215.770992][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 215.778189][ C1] br_nf_forward_finish+0x66c/0xa90 [ 215.783728][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 215.789806][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 215.795764][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 215.801593][ C1] ? mark_held_locks+0xf0/0xf0 [ 215.806340][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 215.811453][ C1] ? __vlan_flush+0x120/0x120 [ 215.816113][ C1] nf_hook_slow+0xbc/0x1e0 [ 215.820508][ C1] __br_forward+0x393/0xb00 [ 215.824992][ C1] ? br_forward_finish+0x400/0x400 [ 215.830084][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 215.835627][ C1] deliver_clone+0x61/0xc0 [ 215.840025][ C1] br_flood+0x325/0x3d0 [ 215.844164][ C1] br_handle_frame_finish+0xb46/0x1670 [ 215.849604][ C1] ? br_handle_local_finish+0x20/0x20 [ 215.854959][ C1] ? audit_alloc_mark+0x430/0x500 [ 215.860073][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 215.865773][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 215.870341][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 215.875258][ C1] ? br_handle_local_finish+0x20/0x20 [ 215.880636][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 215.885730][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 215.891948][ C1] ? br_handle_local_finish+0x20/0x20 [ 215.897314][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 215.903187][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 215.909060][ C1] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 215.915014][ C1] ? br_handle_local_finish+0x20/0x20 [ 215.920366][ C1] br_nf_pre_routing_ipv6+0x456/0x832 [ 215.925716][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 215.930750][ C1] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 215.937113][ C1] ? br_nf_pre_routing+0x246/0x2355 [ 215.942482][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 215.948703][ C1] ? skb_pull_rcsum+0x155/0x300 [ 215.954432][ C1] br_nf_pre_routing+0x1743/0x2355 [ 215.959701][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 215.965665][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 215.971536][ C1] br_handle_frame+0x806/0x133e [ 215.976366][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 215.982063][ C1] ? br_handle_local_finish+0x20/0x20 [ 215.987411][ C1] ? try_to_wake_up+0xf3/0x1a90 [ 215.992239][ C1] ? __kasan_check_read+0x11/0x20 [ 215.997244][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 216.003462][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 216.009163][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 216.015124][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 216.020042][ C1] ? try_to_wake_up+0xb0/0x1a90 [ 216.024896][ C1] ? do_xdp_generic+0x50/0x50 [ 216.030352][ C1] ? swake_up_one+0x4d/0x60 [ 216.034835][ C1] ? __kasan_check_read+0x11/0x20 [ 216.039842][ C1] ? lock_downgrade+0x920/0x920 [ 216.044775][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 216.050734][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 216.056690][ C1] ? __kasan_check_write+0x14/0x20 [ 216.061782][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 216.067658][ C1] ? lock_acquire+0x190/0x410 [ 216.072315][ C1] ? process_backlog+0x195/0x750 [ 216.077231][ C1] __netif_receive_skb+0x2c/0x1d0 [ 216.082234][ C1] process_backlog+0x206/0x750 [ 216.086976][ C1] ? __kasan_check_read+0x11/0x20 [ 216.091995][ C1] net_rx_action+0x4d6/0x1030 [ 216.096653][ C1] ? napi_complete_done+0x4b0/0x4b0 [ 216.101829][ C1] ? sched_clock+0x2e/0x50 [ 216.106226][ C1] ? ip6_finish_output2+0x106d/0x2520 [ 216.111577][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 216.118255][ C1] __do_softirq+0x262/0x98c [ 216.122744][ C1] ? ip6_finish_output2+0x106d/0x2520 [ 216.128108][ C1] do_softirq_own_stack+0x2a/0x40 [ 216.133107][ C1] [ 216.136043][ C1] do_softirq.part.0+0x11a/0x170 [ 216.140965][ C1] __local_bh_enable_ip+0x211/0x270 [ 216.146154][ C1] ip6_finish_output2+0x10a0/0x2520 [ 216.151333][ C1] ? ip6_forward_finish+0x530/0x530 [ 216.156533][ C1] ? lock_downgrade+0x920/0x920 [ 216.161583][ C1] ? ip6_mtu+0x16f/0x460 [ 216.165894][ C1] __ip6_finish_output+0x444/0xa50 [ 216.170984][ C1] ? __ip6_finish_output+0x444/0xa50 [ 216.176247][ C1] ip6_finish_output+0x38/0x1f0 [ 216.181078][ C1] ip6_output+0x235/0x7c0 [ 216.185398][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 216.190490][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 216.195761][ C1] ? ndisc_send_skb+0x803/0x1450 [ 216.200680][ C1] ndisc_send_skb+0xf29/0x1450 [ 216.206567][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 216.211871][ C1] ? skb_set_owner_w+0x21b/0x320 [ 216.216802][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 216.222591][ C1] ndisc_send_ns+0x3a9/0x850 [ 216.227160][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 216.233381][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 216.238558][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 216.243762][ C1] ? trace_hardirqs_on+0x67/0x240 [ 216.248766][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 216.253947][ C1] addrconf_dad_work+0xb88/0x1150 [ 216.259386][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 216.264911][ C1] ? lock_acquire+0x190/0x410 [ 216.269566][ C1] ? trace_hardirqs_on+0x67/0x240 [ 216.274842][ C1] process_one_work+0x9af/0x1740 [ 216.279849][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 216.285198][ C1] ? lock_acquire+0x190/0x410 [ 216.289864][ C1] worker_thread+0x98/0xe40 [ 216.294342][ C1] ? trace_hardirqs_on+0x67/0x240 [ 216.299347][ C1] kthread+0x361/0x430 [ 216.303403][ C1] ? process_one_work+0x1740/0x1740 [ 216.308584][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 216.314800][ C1] ret_from_fork+0x24/0x30