[....] 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. [ 62.075667][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 62.075676][ T26] audit: type=1800 audit(1568498364.233:29): pid=9537 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 [ 62.108872][ T26] audit: type=1800 audit(1568498364.233:30): pid=9537 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 '10.128.0.147' (ECDSA) to the list of known hosts. syzkaller login: [ 330.965734][ T9690] IPVS: ftp: loaded support on port[0] = 21 [ 331.015035][ T9690] chnl_net:caif_netlink_parms(): no params data found [ 331.036445][ T9690] bridge0: port 1(bridge_slave_0) entered blocking state [ 331.043626][ T9690] bridge0: port 1(bridge_slave_0) entered disabled state [ 331.051119][ T9690] device bridge_slave_0 entered promiscuous mode [ 331.058338][ T9690] bridge0: port 2(bridge_slave_1) entered blocking state [ 331.065459][ T9690] bridge0: port 2(bridge_slave_1) entered disabled state [ 331.072948][ T9690] device bridge_slave_1 entered promiscuous mode [ 331.086854][ T9690] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 331.096915][ T9690] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 331.112542][ T9690] team0: Port device team_slave_0 added [ 331.119505][ T9690] team0: Port device team_slave_1 added [ 331.185165][ T9690] device hsr_slave_0 entered promiscuous mode [ 331.253811][ T9690] device hsr_slave_1 entered promiscuous mode [ 331.329335][ T9690] bridge0: port 2(bridge_slave_1) entered blocking state [ 331.336537][ T9690] bridge0: port 2(bridge_slave_1) entered forwarding state [ 331.343981][ T9690] bridge0: port 1(bridge_slave_0) entered blocking state [ 331.351020][ T9690] bridge0: port 1(bridge_slave_0) entered forwarding state [ 331.373028][ T9690] 8021q: adding VLAN 0 to HW filter on device bond0 [ 331.384910][ T9695] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 331.392875][ T9695] bridge0: port 1(bridge_slave_0) entered disabled state [ 331.400451][ T9695] bridge0: port 2(bridge_slave_1) entered disabled state [ 331.408940][ T9695] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 331.419507][ T9690] 8021q: adding VLAN 0 to HW filter on device team0 [ 331.428504][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 331.436823][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 331.443880][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 331.453654][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 331.461906][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 331.468970][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 331.484538][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 331.492933][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 331.501253][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 331.510281][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 331.519677][ T9695] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 331.529160][ T9690] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 331.542943][ T9690] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 436.573410][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 436.580059][ C1] rcu: 1-...!: (1 GPs behind) idle=ffe/1/0x4000000000000002 softirq=8783/8784 fqs=43 [ 436.589666][ C1] (t=10500 jiffies g=8945 q=99) [ 436.594588][ C1] rcu: rcu_preempt kthread starved for 10414 jiffies! g8945 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 436.605834][ C1] rcu: RCU grace-period kthread stack dump: [ 436.611706][ C1] rcu_preempt I29520 10 2 0x80004000 [ 436.618026][ C1] Call Trace: [ 436.621386][ C1] __schedule+0x755/0x1580 [ 436.625794][ C1] ? __sched_text_start+0x8/0x8 [ 436.630625][ C1] schedule+0xd9/0x260 [ 436.634673][ C1] schedule_timeout+0x486/0xc50 [ 436.639501][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 436.644419][ C1] ? usleep_range+0x170/0x170 [ 436.649160][ C1] ? trace_hardirqs_on+0x67/0x240 [ 436.654160][ C1] ? __kasan_check_read+0x11/0x20 [ 436.659162][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 436.664695][ C1] ? swake_up_one+0x60/0x60 [ 436.669180][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 436.673926][ C1] ? rcu_barrier+0x310/0x310 [ 436.678506][ C1] ? trace_hardirqs_on+0x67/0x240 [ 436.683510][ C1] ? __kasan_check_read+0x11/0x20 [ 436.688516][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 436.694733][ C1] ? __kthread_parkme+0x108/0x1c0 [ 436.699741][ C1] ? __kasan_check_read+0x11/0x20 [ 436.704744][ C1] kthread+0x361/0x430 [ 436.708792][ C1] ? rcu_barrier+0x310/0x310 [ 436.713363][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 436.719584][ C1] ret_from_fork+0x24/0x30 [ 436.724010][ C1] NMI backtrace for cpu 1 [ 436.728320][ C1] CPU: 1 PID: 9695 Comm: kworker/1:1 Not tainted 5.3.0-rc8+ #0 [ 436.735843][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 436.745963][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 436.751938][ C1] Call Trace: [ 436.755199][ C1] [ 436.758059][ C1] dump_stack+0x172/0x1f0 [ 436.762374][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 436.767556][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 436.773783][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 436.779397][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 436.785442][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 436.791320][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 436.796410][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 436.801937][ C1] ? raise_softirq+0x138/0x340 [ 436.806683][ C1] update_process_times+0x32/0x80 [ 436.811686][ C1] tick_sched_handle+0xa2/0x190 [ 436.816515][ C1] tick_sched_timer+0x53/0x140 [ 436.821257][ C1] __hrtimer_run_queues+0x364/0xe40 [ 436.826444][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 436.831711][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 436.837668][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 436.843377][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 436.849434][ C1] hrtimer_interrupt+0x314/0x770 [ 436.854399][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 436.859933][ C1] apic_timer_interrupt+0xf/0x20 [ 436.864853][ C1] [ 436.867775][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 [ 436.873843][ C1] Code: 19 09 41 bc f4 ff ff ff e8 9d 9f e9 ff 48 c7 05 0e 4d 19 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 <65> 48 8b 04 25 40 fe 01 00 65 8b 15 f4 88 8f 7e 81 e2 00 01 1f 00 [ 436.893422][ C1] RSP: 0018:ffff88809036ed48 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 [ 436.901809][ C1] RAX: ffff8880995d5068 RBX: ffff8880995d5078 RCX: ffffffff85c66b39 [ 436.909760][ C1] RDX: ffff8880995d5040 RSI: ffffffff85c66fb7 RDI: 0000000000000005 [ 436.917723][ C1] RBP: ffff88809036ed48 R08: ffff8880989f65c0 R09: 0000000000000000 [ 436.925673][ C1] R10: fffffbfff134afaf R11: ffff8880989f65c0 R12: dffffc0000000000 [ 436.933627][ C1] R13: ffff8880995d4d80 R14: 0000000000000001 R15: 0000000000000000 [ 436.941627][ C1] ? hhf_dequeue+0xb9/0xa20 [ 436.946111][ C1] ? hhf_dequeue+0x537/0xa20 [ 436.950693][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 436.956914][ C1] hhf_dequeue+0x552/0xa20 [ 436.961354][ C1] __qdisc_run+0x1e7/0x19d0 [ 436.965858][ C1] ? dev_queue_xmit+0x18/0x20 [ 436.970528][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 436.975534][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 436.980886][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 436.986154][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 436.992403][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 436.997689][ C1] ? br_forward_finish+0x235/0x400 [ 437.002798][ C1] ? __kasan_check_read+0x11/0x20 [ 437.007810][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 437.012993][ C1] dev_queue_xmit+0x18/0x20 [ 437.017485][ C1] ? dev_queue_xmit+0x18/0x20 [ 437.022144][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 437.027565][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 437.032139][ C1] br_forward_finish+0xfa/0x400 [ 437.036972][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 437.042495][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 437.047237][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 437.052932][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 437.057496][ C1] __br_forward+0x641/0xb00 [ 437.061979][ C1] ? br_forward_finish+0x400/0x400 [ 437.067154][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 437.072687][ C1] deliver_clone+0x61/0xc0 [ 437.077081][ C1] maybe_deliver+0x2c7/0x390 [ 437.081650][ C1] br_flood+0x13a/0x3d0 [ 437.085830][ C1] br_dev_xmit+0x98c/0x15a0 [ 437.090317][ C1] ? br_poll_controller+0x10/0x10 [ 437.095346][ C1] ? netif_skb_features+0x6c2/0xb90 [ 437.100583][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 437.105870][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 437.112126][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 437.117304][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 437.122340][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 437.128574][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 437.133671][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 437.139902][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 437.144963][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 437.150057][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 437.155407][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 437.160776][ C1] ? __kasan_check_read+0x11/0x20 [ 437.165786][ C1] ? lock_downgrade+0x920/0x920 [ 437.170631][ C1] dev_queue_xmit+0x18/0x20 [ 437.175122][ C1] ? dev_queue_xmit+0x18/0x20 [ 437.179831][ C1] neigh_resolve_output+0x5a5/0x970 [ 437.185021][ C1] ip6_finish_output2+0x1034/0x2520 [ 437.190197][ C1] ? ip6_mtu+0x2e6/0x460 [ 437.194419][ C1] ? ip6_forward_finish+0x530/0x530 [ 437.199594][ C1] ? lock_downgrade+0x920/0x920 [ 437.204420][ C1] ? ip6_mtu+0x16f/0x460 [ 437.208646][ C1] __ip6_finish_output+0x444/0xa50 [ 437.213731][ C1] ? __ip6_finish_output+0x444/0xa50 [ 437.218994][ C1] ip6_finish_output+0x38/0x1f0 [ 437.223839][ C1] ip6_output+0x235/0x7c0 [ 437.228146][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 437.233232][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 437.238495][ C1] ? ndisc_send_skb+0x803/0x1450 [ 437.243415][ C1] ndisc_send_skb+0xf29/0x1450 [ 437.248161][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 437.253469][ C1] ? skb_set_owner_w+0x21b/0x320 [ 437.258389][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 437.264268][ C1] ndisc_send_ns+0x3a9/0x850 [ 437.268846][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 437.275065][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 437.280239][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 437.285412][ C1] ? trace_hardirqs_on+0x67/0x240 [ 437.290415][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 437.295598][ C1] addrconf_dad_work+0xb88/0x1150 [ 437.300608][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 437.306132][ C1] ? lock_acquire+0x190/0x410 [ 437.310807][ C1] ? trace_hardirqs_on+0x67/0x240 [ 437.315815][ C1] process_one_work+0x9af/0x1740 [ 437.320738][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 437.326090][ C1] ? lock_acquire+0x190/0x410 [ 437.330768][ C1] worker_thread+0x98/0xe40 [ 437.335252][ C1] ? trace_hardirqs_on+0x67/0x240 [ 437.340260][ C1] kthread+0x361/0x430 [ 437.344308][ C1] ? process_one_work+0x1740/0x1740 [ 437.349479][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 437.355718][ C1] ret_from_fork+0x24/0x30