[....] 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. [ 67.145826][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 67.145836][ T26] audit: type=1800 audit(1568258673.092:29): pid=9728 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 [ 67.183496][ T26] audit: type=1800 audit(1568258673.092:30): pid=9728 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 '10.128.0.183' (ECDSA) to the list of known hosts. syzkaller login: [ 174.532958][ T9879] IPVS: ftp: loaded support on port[0] = 21 [ 174.581547][ T9879] chnl_net:caif_netlink_parms(): no params data found [ 174.603601][ T9879] bridge0: port 1(bridge_slave_0) entered blocking state [ 174.610804][ T9879] bridge0: port 1(bridge_slave_0) entered disabled state [ 174.618344][ T9879] device bridge_slave_0 entered promiscuous mode [ 174.625457][ T9879] bridge0: port 2(bridge_slave_1) entered blocking state [ 174.632639][ T9879] bridge0: port 2(bridge_slave_1) entered disabled state [ 174.640161][ T9879] device bridge_slave_1 entered promiscuous mode [ 174.654117][ T9879] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 174.664515][ T9879] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 174.680550][ T9879] team0: Port device team_slave_0 added [ 174.686928][ T9879] team0: Port device team_slave_1 added [ 174.758741][ T9879] device hsr_slave_0 entered promiscuous mode [ 174.817348][ T9879] device hsr_slave_1 entered promiscuous mode [ 174.862194][ T9879] bridge0: port 2(bridge_slave_1) entered blocking state [ 174.869285][ T9879] bridge0: port 2(bridge_slave_1) entered forwarding state [ 174.876568][ T9879] bridge0: port 1(bridge_slave_0) entered blocking state [ 174.883654][ T9879] bridge0: port 1(bridge_slave_0) entered forwarding state [ 174.907564][ T9879] 8021q: adding VLAN 0 to HW filter on device bond0 [ 174.917644][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 174.936298][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 174.944365][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 174.952534][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 174.962327][ T9879] 8021q: adding VLAN 0 to HW filter on device team0 [ 174.971056][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 174.979674][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 174.986696][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 174.996006][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 175.004610][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 175.011703][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 175.024907][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 175.033324][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 175.042941][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 175.053508][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 175.063817][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 175.073414][ T9879] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 175.088212][ T9879] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 280.146975][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 280.153641][ C1] rcu: 1-....: (1 GPs behind) idle=9ae/1/0x4000000000000002 softirq=9075/9076 fqs=5250 [ 280.163422][ C1] (t=10502 jiffies g=9665 q=91) [ 280.168332][ C1] NMI backtrace for cpu 1 [ 280.172637][ C1] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.3.0-rc8+ #0 [ 280.179974][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 280.190117][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 280.196075][ C1] Call Trace: [ 280.199336][ C1] [ 280.202215][ C1] dump_stack+0x172/0x1f0 [ 280.206544][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 280.211722][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 280.217951][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 280.223562][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 280.229520][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 280.235417][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 280.240507][ C1] ? find_next_bit+0x107/0x130 [ 280.245255][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 280.250779][ C1] ? raise_softirq+0x138/0x340 [ 280.255522][ C1] update_process_times+0x32/0x80 [ 280.260537][ C1] tick_sched_handle+0xa2/0x190 [ 280.265378][ C1] tick_sched_timer+0x53/0x140 [ 280.270122][ C1] __hrtimer_run_queues+0x364/0xe40 [ 280.275301][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 280.280566][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 280.286101][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 280.291799][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 280.297847][ C1] hrtimer_interrupt+0x314/0x770 [ 280.302826][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 280.308391][ C1] apic_timer_interrupt+0xf/0x20 [ 280.313312][ C1] [ 280.316244][ C1] RIP: 0010:__list_add_valid+0x70/0xa0 [ 280.321701][ C1] Code: 89 f2 48 c1 ea 03 80 3c 02 00 75 3c 48 8b 16 4c 39 e2 0f 85 5f 01 00 00 49 39 f5 0f 84 3f 01 00 00 4d 39 e5 0f 84 36 01 00 00 <48> 83 c4 08 b8 01 00 00 00 41 5c 41 5d 5d c3 48 89 75 e8 e8 f8 47 [ 280.341284][ C1] RSP: 0018:ffff8880a99173d0 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 280.349672][ C1] RAX: dffffc0000000000 RBX: ffff88809249f078 RCX: ffffffff85c66051 [ 280.357622][ C1] RDX: ffff88809249f110 RSI: ffff88809249f110 RDI: ffff88809249f118 [ 280.365573][ C1] RBP: ffff8880a99173e8 R08: ffff8880a9906480 R09: 0000000000000000 [ 280.373522][ C1] R10: fffffbfff134afaf R11: ffff8880a9906480 R12: ffff88809249f110 [ 280.381472][ C1] R13: ffff88809249f078 R14: ffff88809249f118 R15: ffff88809249f110 [ 280.389503][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 280.394076][ C1] hhf_dequeue+0x66d/0xa20 [ 280.398515][ C1] __qdisc_run+0x1e7/0x19d0 [ 280.403022][ C1] ? dev_queue_xmit+0x18/0x20 [ 280.407681][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 280.412721][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 280.417816][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 280.423081][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 280.428432][ C1] ? __kasan_check_read+0x11/0x20 [ 280.433439][ C1] ? lock_downgrade+0x920/0x920 [ 280.438303][ C1] dev_queue_xmit+0x18/0x20 [ 280.442797][ C1] ? dev_queue_xmit+0x18/0x20 [ 280.447534][ C1] neigh_resolve_output+0x5a5/0x970 [ 280.452724][ C1] ip6_finish_output2+0x1034/0x2520 [ 280.457903][ C1] ? ip6_forward_finish+0x530/0x530 [ 280.463082][ C1] ? lock_downgrade+0x920/0x920 [ 280.467912][ C1] ? ip6_mtu+0x16f/0x460 [ 280.472163][ C1] __ip6_finish_output+0x444/0xa50 [ 280.477269][ C1] ? __ip6_finish_output+0x444/0xa50 [ 280.482556][ C1] ip6_finish_output+0x38/0x1f0 [ 280.487389][ C1] ip6_output+0x235/0x7c0 [ 280.491697][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 280.496790][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 280.502052][ C1] ? ndisc_send_skb+0x803/0x1450 [ 280.506971][ C1] ndisc_send_skb+0xf29/0x1450 [ 280.511720][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 280.517061][ C1] ? skb_set_owner_w+0x21b/0x320 [ 280.521983][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 280.527685][ C1] ndisc_send_ns+0x3a9/0x850 [ 280.532260][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 280.538493][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 280.543673][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 280.548850][ C1] ? trace_hardirqs_on+0x67/0x240 [ 280.553851][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 280.559030][ C1] addrconf_dad_work+0xb88/0x1150 [ 280.564036][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 280.569563][ C1] ? lock_acquire+0x190/0x410 [ 280.574239][ C1] ? trace_hardirqs_on+0x67/0x240 [ 280.579386][ C1] process_one_work+0x9af/0x1740 [ 280.584315][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 280.589671][ C1] ? lock_acquire+0x190/0x410 [ 280.594338][ C1] worker_thread+0x98/0xe40 [ 280.598829][ C1] kthread+0x361/0x430 [ 280.602888][ C1] ? process_one_work+0x1740/0x1740 [ 280.608063][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 280.614284][ C1] ret_from_fork+0x24/0x30