[....] 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. [ 65.660861][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 65.660871][ T26] audit: type=1800 audit(1568274429.840:29): pid=9760 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 [ 65.697323][ T26] audit: type=1800 audit(1568274429.840:30): pid=9760 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 '10.128.0.255' (ECDSA) to the list of known hosts. syzkaller login: [ 195.941418][ T9916] IPVS: ftp: loaded support on port[0] = 21 [ 195.986487][ T9916] chnl_net:caif_netlink_parms(): no params data found [ 196.012036][ T9916] bridge0: port 1(bridge_slave_0) entered blocking state [ 196.019399][ T9916] bridge0: port 1(bridge_slave_0) entered disabled state [ 196.027331][ T9916] device bridge_slave_0 entered promiscuous mode [ 196.035084][ T9916] bridge0: port 2(bridge_slave_1) entered blocking state [ 196.042740][ T9916] bridge0: port 2(bridge_slave_1) entered disabled state [ 196.050805][ T9916] device bridge_slave_1 entered promiscuous mode [ 196.064504][ T9916] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 196.074968][ T9916] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 196.091104][ T9916] team0: Port device team_slave_0 added [ 196.097774][ T9916] team0: Port device team_slave_1 added [ 196.169547][ T9916] device hsr_slave_0 entered promiscuous mode [ 196.208075][ T9916] device hsr_slave_1 entered promiscuous mode [ 196.283494][ T9916] bridge0: port 2(bridge_slave_1) entered blocking state [ 196.290595][ T9916] bridge0: port 2(bridge_slave_1) entered forwarding state [ 196.297945][ T9916] bridge0: port 1(bridge_slave_0) entered blocking state [ 196.305004][ T9916] bridge0: port 1(bridge_slave_0) entered forwarding state [ 196.329254][ T9916] 8021q: adding VLAN 0 to HW filter on device bond0 [ 196.340711][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 196.349319][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 196.356818][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 196.365358][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 196.375156][ T9916] 8021q: adding VLAN 0 to HW filter on device team0 [ 196.384553][ T2834] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 196.393090][ T2834] bridge0: port 1(bridge_slave_0) entered blocking state [ 196.400398][ T2834] bridge0: port 1(bridge_slave_0) entered forwarding state [ 196.418340][ T9918] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 196.426830][ T9918] bridge0: port 2(bridge_slave_1) entered blocking state [ 196.434364][ T9918] bridge0: port 2(bridge_slave_1) entered forwarding state [ 196.442294][ T9918] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 196.450773][ T9918] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 196.459350][ T9918] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 196.468654][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 196.478144][ T2834] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 196.487759][ T9916] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 196.503237][ T9916] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 301.527640][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 301.534810][ C1] rcu: 1-...!: (1 GPs behind) idle=ec6/1/0x4000000000000002 softirq=10450/10451 fqs=45 [ 301.544776][ C1] (t=10500 jiffies g=9513 q=47) [ 301.549819][ C1] rcu: rcu_preempt kthread starved for 10410 jiffies! g9513 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 301.564116][ C1] rcu: RCU grace-period kthread stack dump: [ 301.570337][ C1] rcu_preempt I29320 10 2 0x80004000 [ 301.576818][ C1] Call Trace: [ 301.580243][ C1] __schedule+0x755/0x1580 [ 301.584666][ C1] ? __sched_text_start+0x8/0x8 [ 301.589663][ C1] schedule+0xd9/0x260 [ 301.594108][ C1] schedule_timeout+0x486/0xc50 [ 301.599100][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 301.604326][ C1] ? usleep_range+0x170/0x170 [ 301.609166][ C1] ? trace_hardirqs_on+0x67/0x240 [ 301.614384][ C1] ? __kasan_check_read+0x11/0x20 [ 301.619733][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 301.625473][ C1] ? swake_up_one+0x60/0x60 [ 301.630625][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 301.636556][ C1] ? rcu_barrier+0x310/0x310 [ 301.641686][ C1] ? trace_hardirqs_on+0x67/0x240 [ 301.646835][ C1] ? __kasan_check_read+0x11/0x20 [ 301.651860][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 301.658096][ C1] ? __kthread_parkme+0x108/0x1c0 [ 301.663465][ C1] ? __kasan_check_read+0x11/0x20 [ 301.668546][ C1] kthread+0x361/0x430 [ 301.672787][ C1] ? rcu_barrier+0x310/0x310 [ 301.677390][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 301.683937][ C1] ret_from_fork+0x24/0x30 [ 301.688678][ C1] NMI backtrace for cpu 1 [ 301.693119][ C1] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.3.0-rc8+ #0 [ 301.700593][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 301.710809][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 301.716951][ C1] Call Trace: [ 301.720308][ C1] [ 301.723159][ C1] dump_stack+0x172/0x1f0 [ 301.727842][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 301.733233][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 301.739711][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 301.745652][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 301.751764][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 301.757738][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 301.763237][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 301.769071][ C1] ? raise_softirq+0x138/0x340 [ 301.774175][ C1] update_process_times+0x32/0x80 [ 301.779378][ C1] tick_sched_handle+0xa2/0x190 [ 301.784221][ C1] tick_sched_timer+0x53/0x140 [ 301.789151][ C1] __hrtimer_run_queues+0x364/0xe40 [ 301.794621][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 301.799899][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 301.805644][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 301.811439][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 301.817499][ C1] hrtimer_interrupt+0x314/0x770 [ 301.822734][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 301.828554][ C1] apic_timer_interrupt+0xf/0x20 [ 301.834012][ C1] [ 301.837397][ C1] RIP: 0010:hhf_dequeue+0x6ba/0xa20 [ 301.843239][ 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 [ 301.865492][ C1] RSP: 0018:ffff8880a9a4f3f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 301.874315][ C1] RAX: ffff888090e76850 RBX: ffff888090e767b8 RCX: ffffffff85c660f9 [ 301.883347][ C1] RDX: 0000000000000000 RSI: ffffffff85c6610b RDI: 0000000000000001 [ 301.892217][ C1] RBP: ffff8880a9a4f448 R08: ffff8880a9a3a5c0 R09: 0000000000000000 [ 301.901174][ C1] R10: fffffbfff134afaf R11: ffff8880a9a3a5c0 R12: dffffc0000000000 [ 301.911194][ C1] R13: ffff888090e764c0 R14: ffff888090e76858 R15: ffff888090e76850 [ 301.920732][ C1] ? hhf_dequeue+0x679/0xa20 [ 301.925580][ C1] ? hhf_dequeue+0x68b/0xa20 [ 301.931268][ C1] ? hhf_dequeue+0x68b/0xa20 [ 301.936402][ C1] __qdisc_run+0x1e7/0x19d0 [ 301.941173][ C1] ? dev_queue_xmit+0x18/0x20 [ 301.946348][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 301.952087][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 301.957916][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 301.963415][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 301.968871][ C1] ? __kasan_check_read+0x11/0x20 [ 301.974200][ C1] ? lock_downgrade+0x920/0x920 [ 301.980439][ C1] dev_queue_xmit+0x18/0x20 [ 301.985242][ C1] ? dev_queue_xmit+0x18/0x20 [ 301.990123][ C1] neigh_resolve_output+0x5a5/0x970 [ 301.995322][ C1] ip6_finish_output2+0x1034/0x2520 [ 302.000951][ C1] ? ip6_forward_finish+0x530/0x530 [ 302.006148][ C1] ? lock_downgrade+0x920/0x920 [ 302.010996][ C1] ? ip6_mtu+0x16f/0x460 [ 302.015609][ C1] __ip6_finish_output+0x444/0xa50 [ 302.021018][ C1] ? __ip6_finish_output+0x444/0xa50 [ 302.026858][ C1] ip6_finish_output+0x38/0x1f0 [ 302.031969][ C1] ip6_output+0x235/0x7c0 [ 302.037132][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 302.043194][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 302.048726][ C1] ? ndisc_send_skb+0x803/0x1450 [ 302.054810][ C1] ndisc_send_skb+0xf29/0x1450 [ 302.060079][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 302.067063][ C1] ? skb_set_owner_w+0x21b/0x320 [ 302.075139][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 302.081032][ C1] ndisc_send_ns+0x3a9/0x850 [ 302.085882][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 302.092256][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 302.098650][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 302.104006][ C1] ? trace_hardirqs_on+0x67/0x240 [ 302.109370][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 302.114784][ C1] addrconf_dad_work+0xb88/0x1150 [ 302.120688][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 302.126322][ C1] ? lock_acquire+0x190/0x410 [ 302.133625][ C1] ? trace_hardirqs_on+0x67/0x240 [ 302.139030][ C1] process_one_work+0x9af/0x1740 [ 302.144402][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 302.149896][ C1] ? lock_acquire+0x190/0x410 [ 302.154572][ C1] worker_thread+0x98/0xe40 [ 302.159201][ C1] ? trace_hardirqs_on+0x67/0x240 [ 302.164384][ C1] kthread+0x361/0x430 [ 302.168587][ C1] ? process_one_work+0x1740/0x1740 [ 302.173864][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 302.180520][ C1] ret_from_fork+0x24/0x30