[....] 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. [ 61.619626][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 61.619637][ T26] audit: type=1800 audit(1568454868.939:29): pid=9590 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 [ 61.653077][ T26] audit: type=1800 audit(1568454868.939:30): pid=9590 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 '10.128.0.124' (ECDSA) to the list of known hosts. syzkaller login: [ 79.481110][ T9744] IPVS: ftp: loaded support on port[0] = 21 [ 79.526004][ T9744] chnl_net:caif_netlink_parms(): no params data found [ 79.548325][ T9744] bridge0: port 1(bridge_slave_0) entered blocking state [ 79.555742][ T9744] bridge0: port 1(bridge_slave_0) entered disabled state [ 79.563324][ T9744] device bridge_slave_0 entered promiscuous mode [ 79.570954][ T9744] bridge0: port 2(bridge_slave_1) entered blocking state [ 79.578057][ T9744] bridge0: port 2(bridge_slave_1) entered disabled state [ 79.585872][ T9744] device bridge_slave_1 entered promiscuous mode [ 79.599788][ T9744] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 79.610070][ T9744] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 79.625661][ T9744] team0: Port device team_slave_0 added [ 79.632605][ T9744] team0: Port device team_slave_1 added [ 79.710718][ T9744] device hsr_slave_0 entered promiscuous mode [ 79.759167][ T9744] device hsr_slave_1 entered promiscuous mode [ 79.834223][ T9744] bridge0: port 2(bridge_slave_1) entered blocking state [ 79.841488][ T9744] bridge0: port 2(bridge_slave_1) entered forwarding state [ 79.848887][ T9744] bridge0: port 1(bridge_slave_0) entered blocking state [ 79.855939][ T9744] bridge0: port 1(bridge_slave_0) entered forwarding state [ 79.882368][ T9744] 8021q: adding VLAN 0 to HW filter on device bond0 [ 79.893481][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 79.912331][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 79.920364][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 79.928255][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 79.938500][ T9744] 8021q: adding VLAN 0 to HW filter on device team0 [ 79.948791][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 79.957169][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 79.964256][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 79.980155][ T9746] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 79.988488][ T9746] bridge0: port 2(bridge_slave_1) entered blocking state [ 79.995582][ T9746] bridge0: port 2(bridge_slave_1) entered forwarding state [ 80.003487][ T9746] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 80.012037][ T9746] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 80.020681][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 80.030273][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 80.041436][ T9744] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 80.052626][ T9744] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 80.060780][ T3021] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 80.074492][ T9744] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 185.098663][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 185.105303][ C0] rcu: 0-...!: (10499 ticks this GP) idle=a2e/1/0x4000000000000002 softirq=9576/9576 fqs=3 [ 185.115442][ C0] (t=10501 jiffies g=8869 q=150) [ 185.120448][ C0] rcu: rcu_preempt kthread starved for 10496 jiffies! g8869 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 185.131520][ C0] rcu: RCU grace-period kthread stack dump: [ 185.137404][ C0] rcu_preempt R running task 29328 10 2 0x80004000 [ 185.145283][ C0] Call Trace: [ 185.148563][ C0] __schedule+0x755/0x1580 [ 185.152963][ C0] ? __sched_text_start+0x8/0x8 [ 185.157796][ C0] schedule+0xd9/0x260 [ 185.163150][ C0] schedule_timeout+0x486/0xc50 [ 185.167986][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 185.172922][ C0] ? usleep_range+0x170/0x170 [ 185.177577][ C0] ? trace_hardirqs_on+0x67/0x240 [ 185.182591][ C0] ? __kasan_check_read+0x11/0x20 [ 185.187596][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 185.193122][ C0] ? swake_up_one+0x60/0x60 [ 185.197694][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 185.202439][ C0] ? rcu_barrier+0x310/0x310 [ 185.207007][ C0] ? trace_hardirqs_on+0x67/0x240 [ 185.212019][ C0] ? __kasan_check_read+0x11/0x20 [ 185.217025][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 185.223249][ C0] ? __kthread_parkme+0x108/0x1c0 [ 185.228250][ C0] ? __kasan_check_read+0x11/0x20 [ 185.233257][ C0] kthread+0x361/0x430 [ 185.237303][ C0] ? rcu_barrier+0x310/0x310 [ 185.241869][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 185.248088][ C0] ret_from_fork+0x24/0x30 [ 185.252487][ C0] NMI backtrace for cpu 0 [ 185.256815][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc8+ #0 [ 185.264084][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 185.274115][ C0] Call Trace: [ 185.277376][ C0] [ 185.280221][ C0] dump_stack+0x172/0x1f0 [ 185.284532][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 185.289718][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 185.295952][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 185.301564][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 185.307523][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 185.313409][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 185.318544][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 185.324070][ C0] ? raise_softirq+0x138/0x340 [ 185.328826][ C0] update_process_times+0x32/0x80 [ 185.333915][ C0] tick_sched_handle+0xa2/0x190 [ 185.338762][ C0] tick_sched_timer+0x53/0x140 [ 185.343512][ C0] __hrtimer_run_queues+0x364/0xe40 [ 185.348702][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 185.353968][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 185.359491][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 185.365188][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 185.371238][ C0] hrtimer_interrupt+0x314/0x770 [ 185.376174][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 185.381701][ C0] apic_timer_interrupt+0xf/0x20 [ 185.386611][ C0] [ 185.389531][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 [ 185.395671][ C0] Code: 90 f0 12 00 00 83 fa 02 75 20 48 8b 88 f8 12 00 00 8b 80 f4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 <5d> c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 a8 88 8f 7e a9 [ 185.415257][ C0] RSP: 0018:ffff8880a98b6998 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 185.423739][ C0] RAX: ffff8880a98a2240 RBX: ffff888092c0c2f8 RCX: ffffffff85c66b39 [ 185.431693][ C0] RDX: 0000000000000100 RSI: ffffffff85c66fd2 RDI: 0000000000000005 [ 185.439658][ C0] RBP: ffff8880a98b6998 R08: ffff8880a98a2240 R09: 0000000000000000 [ 185.447609][ C0] R10: fffffbfff134afaf R11: ffff8880a98a2240 R12: dffffc0000000000 [ 185.455560][ C0] R13: ffff888092c0c000 R14: 0000000000000001 R15: 0000000000000000 [ 185.463524][ C0] ? hhf_dequeue+0xb9/0xa20 [ 185.468017][ C0] ? hhf_dequeue+0x552/0xa20 [ 185.472590][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 185.478808][ C0] hhf_dequeue+0x552/0xa20 [ 185.483218][ C0] __qdisc_run+0x1e7/0x19d0 [ 185.487703][ C0] ? dev_queue_xmit+0x18/0x20 [ 185.492359][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 185.497363][ C0] ? process_backlog+0x206/0x750 [ 185.502278][ C0] ? net_rx_action+0x4d6/0x1030 [ 185.507109][ C0] ? __do_softirq+0x262/0x98c [ 185.511764][ C0] ? run_ksoftirqd+0x8e/0x110 [ 185.516419][ C0] ? smpboot_thread_fn+0x6a3/0xa40 [ 185.521523][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 185.526791][ C0] ? quarantine_put+0x11c/0x1c0 [ 185.531621][ C0] ? trace_hardirqs_on+0x67/0x240 [ 185.536625][ C0] ? __skb_ext_put+0xd9/0x210 [ 185.541288][ C0] dev_queue_xmit+0x18/0x20 [ 185.545770][ C0] ? dev_queue_xmit+0x18/0x20 [ 185.550427][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 185.555778][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 185.560434][ C0] ? lock_downgrade+0x920/0x920 [ 185.565267][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 185.570546][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 185.576246][ C0] br_nf_post_routing+0x1502/0x1d30 [ 185.581425][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 185.586953][ C0] ? mark_held_locks+0xf0/0xf0 [ 185.591698][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 185.597492][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 185.603286][ C0] nf_hook_slow+0xbc/0x1e0 [ 185.607695][ C0] br_forward_finish+0x215/0x400 [ 185.612622][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 185.618150][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 185.622895][ C0] ? ip_vs_out+0x244/0x1700 [ 185.627377][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 185.633083][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 185.637654][ C0] ? should_fail+0x1de/0x852 [ 185.642225][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 185.647160][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 185.652706][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 185.657820][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 185.663365][ C0] ? br_nf_forward_finish+0x176/0xa90 [ 185.668718][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 185.674589][ C0] br_nf_forward_finish+0x66c/0xa90 [ 185.679778][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 185.685322][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 185.690237][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 185.695500][ C0] ? mark_held_locks+0xf0/0xf0 [ 185.700241][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 185.705329][ C0] ? __vlan_flush+0x120/0x120 [ 185.709990][ C0] nf_hook_slow+0xbc/0x1e0 [ 185.714473][ C0] __br_forward+0x393/0xb00 [ 185.719131][ C0] ? br_forward_finish+0x400/0x400 [ 185.724222][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 185.729749][ C0] deliver_clone+0x61/0xc0 [ 185.734150][ C0] br_flood+0x325/0x3d0 [ 185.738287][ C0] br_handle_frame_finish+0xb46/0x1670 [ 185.743724][ C0] ? br_handle_local_finish+0x20/0x20 [ 185.749083][ C0] ? audit_alloc_mark+0x420/0x500 [ 185.754087][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 185.759785][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 185.764355][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 185.769271][ C0] ? br_handle_local_finish+0x20/0x20 [ 185.774618][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 185.779711][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 185.785930][ C0] ? br_handle_local_finish+0x20/0x20 [ 185.791291][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 185.797161][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 185.803033][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 185.808993][ C0] ? br_handle_local_finish+0x20/0x20 [ 185.814343][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 185.819690][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 185.824694][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 185.830823][ C0] ? br_nf_pre_routing+0x246/0x2355 [ 185.836013][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 185.842233][ C0] ? skb_pull_rcsum+0x155/0x300 [ 185.847063][ C0] br_nf_pre_routing+0x1743/0x2355 [ 185.852152][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 185.858030][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 185.863992][ C0] br_handle_frame+0x806/0x133e [ 185.868860][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 185.874570][ C0] ? kfree_skb+0x10e/0x3c0 [ 185.878969][ C0] ? br_handle_local_finish+0x20/0x20 [ 185.884333][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 185.890551][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 185.896261][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 185.901877][ C0] ? do_xdp_generic+0x50/0x50 [ 185.906532][ C0] ? ipv6_rcv+0x116/0x420 [ 185.910852][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 185.916294][ C0] ? __kasan_check_read+0x11/0x20 [ 185.921309][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 185.927190][ C0] ? __kasan_check_read+0x11/0x20 [ 185.932194][ C0] ? __update_load_avg_se+0x726/0xbc0 [ 185.937548][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 185.943334][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 185.949295][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 185.955178][ C0] ? lock_acquire+0x190/0x410 [ 185.959836][ C0] ? process_backlog+0x195/0x750 [ 185.964751][ C0] __netif_receive_skb+0x2c/0x1d0 [ 185.969769][ C0] process_backlog+0x206/0x750 [ 185.974530][ C0] net_rx_action+0x4d6/0x1030 [ 185.979209][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 185.984391][ C0] ? sched_clock+0x2e/0x50 [ 185.988819][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 185.995045][ C0] __do_softirq+0x262/0x98c [ 185.999532][ C0] ? takeover_tasklets+0x820/0x820 [ 186.004620][ C0] run_ksoftirqd+0x8e/0x110 [ 186.009104][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 186.014021][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 186.020239][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 186.026457][ C0] ? __kthread_parkme+0x108/0x1c0 [ 186.031472][ C0] ? __kasan_check_read+0x11/0x20 [ 186.036474][ C0] kthread+0x361/0x430 [ 186.040523][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 186.046747][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 186.052965][ C0] ret_from_fork+0x24/0x30