[....] 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. [ 63.426851][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 63.426861][ T26] audit: type=1800 audit(1568124174.635:29): pid=9700 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 [ 63.458961][ T26] audit: type=1800 audit(1568124174.635:30): pid=9700 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 '10.128.1.2' (ECDSA) to the list of known hosts. syzkaller login: [ 70.275035][ T9857] IPVS: ftp: loaded support on port[0] = 21 [ 70.315355][ T9857] chnl_net:caif_netlink_parms(): no params data found [ 70.337863][ T9857] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.344995][ T9857] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.352768][ T9857] device bridge_slave_0 entered promiscuous mode [ 70.359985][ T9857] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.367109][ T9857] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.374597][ T9857] device bridge_slave_1 entered promiscuous mode [ 70.388845][ T9857] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 70.399023][ T9857] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 70.414061][ T9857] team0: Port device team_slave_0 added [ 70.420932][ T9857] team0: Port device team_slave_1 added [ 70.477497][ T9857] device hsr_slave_0 entered promiscuous mode [ 70.536015][ T9857] device hsr_slave_1 entered promiscuous mode [ 70.580593][ T9857] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.587670][ T9857] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.594928][ T9857] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.602007][ T9857] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.626192][ T9857] 8021q: adding VLAN 0 to HW filter on device bond0 [ 70.637286][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.645249][ T3013] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.653005][ T3013] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.660576][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 70.670486][ T9857] 8021q: adding VLAN 0 to HW filter on device team0 [ 70.679642][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 70.688080][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.695273][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.713308][ T9857] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 70.723754][ T9857] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 70.736053][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 70.744325][ T3013] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.751403][ T3013] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.759488][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 70.767842][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 70.776544][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 70.784626][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 70.793287][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 70.800752][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 70.814571][ T9857] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 175.845606][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 175.852258][ C0] rcu: 0-...!: (1 GPs behind) idle=60a/1/0x4000000000000002 softirq=10023/10024 fqs=31 [ 175.862036][ C0] (t=10501 jiffies g=9233 q=100) [ 175.867044][ C0] rcu: rcu_preempt kthread starved for 10440 jiffies! g9233 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 175.878290][ C0] rcu: RCU grace-period kthread stack dump: [ 175.884171][ C0] rcu_preempt I29392 10 2 0x80004000 [ 175.890491][ C0] Call Trace: [ 175.893773][ C0] __schedule+0x755/0x1580 [ 175.898174][ C0] ? __sched_text_start+0x8/0x8 [ 175.903020][ C0] schedule+0xd9/0x260 [ 175.907069][ C0] schedule_timeout+0x486/0xc50 [ 175.911903][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 175.916822][ C0] ? usleep_range+0x170/0x170 [ 175.921479][ C0] ? trace_hardirqs_on+0x67/0x240 [ 175.926485][ C0] ? __kasan_check_read+0x11/0x20 [ 175.931756][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 175.937281][ C0] ? swake_up_one+0x60/0x60 [ 175.941767][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 175.946513][ C0] ? rcu_barrier+0x310/0x310 [ 175.951084][ C0] ? trace_hardirqs_on+0x67/0x240 [ 175.956099][ C0] ? __kasan_check_read+0x11/0x20 [ 175.961105][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 175.967410][ C0] ? __kthread_parkme+0x108/0x1c0 [ 175.972424][ C0] ? __kasan_check_read+0x11/0x20 [ 175.977429][ C0] kthread+0x361/0x430 [ 175.981497][ C0] ? rcu_barrier+0x310/0x310 [ 175.986086][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 175.992314][ C0] ret_from_fork+0x24/0x30 [ 175.996740][ C0] NMI backtrace for cpu 0 [ 176.001069][ C0] CPU: 0 PID: 3013 Comm: kworker/0:2 Not tainted 5.3.0-rc7+ #0 [ 176.008599][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 176.018648][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 176.024609][ C0] Call Trace: [ 176.027872][ C0] [ 176.030707][ C0] dump_stack+0x172/0x1f0 [ 176.035021][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 176.040220][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.046443][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 176.052056][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 176.058016][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 176.063889][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 176.068986][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 176.074533][ C0] ? raise_softirq+0x138/0x340 [ 176.079285][ C0] update_process_times+0x32/0x80 [ 176.084296][ C0] tick_sched_handle+0xa2/0x190 [ 176.089139][ C0] tick_sched_timer+0x53/0x140 [ 176.093898][ C0] __hrtimer_run_queues+0x364/0xe40 [ 176.099079][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 176.104348][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 176.109874][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 176.115745][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 176.121795][ C0] hrtimer_interrupt+0x314/0x770 [ 176.126720][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 176.132268][ C0] apic_timer_interrupt+0xf/0x20 [ 176.137184][ C0] [ 176.140115][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x15/0x20 [ 176.146955][ C0] Code: 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 48 89 e5 48 8b 4d 08 f6 fe ff ff 5d c3 0f 1f 40 00 55 0f b7 d6 0f b7 f7 bf 03 00 00 [ 176.166540][ C0] RSP: 0018:ffff88809f8ded48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 176.174947][ C0] RAX: 0000000000000001 RBX: ffff888096caec38 RCX: ffffffff85c66361 [ 176.183014][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 176.191053][ C0] RBP: ffff88809f8ded48 R08: ffff88809f8d26c0 R09: 0000000000000000 [ 176.199024][ C0] R10: fffffbfff134af9f R11: ffff88809f8d26c0 R12: dffffc0000000000 [ 176.207000][ C0] R13: ffff888096cae940 R14: 0000000000000001 R15: 0000000000000000 [ 176.214977][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 176.220944][ C0] hhf_dequeue+0x5d1/0xa20 [ 176.225356][ C0] __qdisc_run+0x1e5/0x1a00 [ 176.229839][ C0] ? dev_queue_xmit+0x18/0x20 [ 176.234511][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 176.239515][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 176.244882][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 176.250164][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 176.256472][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 176.261740][ C0] ? br_forward_finish+0x235/0x400 [ 176.266831][ C0] ? __kasan_check_read+0x11/0x20 [ 176.271835][ C0] ? __dev_queue_xmit+0x2b15/0x3650 [ 176.277030][ C0] dev_queue_xmit+0x18/0x20 [ 176.281514][ C0] ? dev_queue_xmit+0x18/0x20 [ 176.286168][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 176.291519][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 176.296091][ C0] br_forward_finish+0xfa/0x400 [ 176.300935][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 176.306460][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 176.311203][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 176.316916][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 176.321504][ C0] __br_forward+0x641/0xb00 [ 176.325991][ C0] ? br_forward_finish+0x400/0x400 [ 176.331094][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 176.336621][ C0] deliver_clone+0x61/0xc0 [ 176.341018][ C0] maybe_deliver+0x2c7/0x390 [ 176.345604][ C0] br_flood+0x13a/0x3d0 [ 176.349744][ C0] br_dev_xmit+0x98c/0x15a0 [ 176.354229][ C0] ? br_poll_controller+0x10/0x10 [ 176.359236][ C0] ? netif_skb_features+0x6c2/0xb90 [ 176.364415][ C0] ? netdev_set_sb_channel+0xe0/0xe0 [ 176.369693][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 176.375917][ C0] ? validate_xmit_xfrm+0x43c/0xf10 [ 176.381095][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 176.386013][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.392233][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 176.397327][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.403556][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 176.408584][ C0] ? ndisc_constructor+0x1a5/0xb40 [ 176.413683][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 176.418955][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 176.424311][ C0] ? __kasan_check_read+0x11/0x20 [ 176.429320][ C0] ? lock_downgrade+0x920/0x920 [ 176.434154][ C0] dev_queue_xmit+0x18/0x20 [ 176.438640][ C0] ? dev_queue_xmit+0x18/0x20 [ 176.443300][ C0] neigh_resolve_output+0x5a5/0x970 [ 176.448481][ C0] ip6_finish_output2+0x1034/0x2520 [ 176.453672][ C0] ? ip6_forward_finish+0x530/0x530 [ 176.458856][ C0] ? lock_downgrade+0x920/0x920 [ 176.463697][ C0] ? ip6_mtu+0x16f/0x460 [ 176.467934][ C0] __ip6_finish_output+0x444/0xa50 [ 176.473028][ C0] ? __ip6_finish_output+0x444/0xa50 [ 176.478302][ C0] ip6_finish_output+0x38/0x1f0 [ 176.483132][ C0] ip6_output+0x235/0x7c0 [ 176.487455][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 176.492548][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 176.497813][ C0] ? ndisc_send_skb+0x803/0x1450 [ 176.502734][ C0] ndisc_send_skb+0xf29/0x1450 [ 176.507485][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 176.512794][ C0] ? skb_set_owner_w+0x21b/0x320 [ 176.517718][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 176.523432][ C0] ndisc_send_ns+0x3a9/0x850 [ 176.528005][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.534230][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 176.539410][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 176.544590][ C0] ? trace_hardirqs_on+0x67/0x240 [ 176.549598][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 176.554876][ C0] addrconf_dad_work+0xb88/0x1150 [ 176.559883][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 176.565421][ C0] ? lock_acquire+0x190/0x410 [ 176.570098][ C0] ? trace_hardirqs_on+0x67/0x240 [ 176.575103][ C0] process_one_work+0x9af/0x1740 [ 176.580034][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 176.585381][ C0] ? lock_acquire+0x190/0x410 [ 176.590044][ C0] worker_thread+0x98/0xe40 [ 176.594542][ C0] ? trace_hardirqs_on+0x67/0x240 [ 176.599568][ C0] kthread+0x361/0x430 [ 176.603624][ C0] ? process_one_work+0x1740/0x1740 [ 176.608801][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 176.615024][ C0] ret_from_fork+0x24/0x30