[....] 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. [ 68.252546][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 68.252557][ T26] audit: type=1800 audit(1568377094.567:29): pid=9724 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 [ 68.279265][ T26] audit: type=1800 audit(1568377094.567:30): pid=9724 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 '10.128.0.39' (ECDSA) to the list of known hosts. syzkaller login: [ 207.798082][ T9877] IPVS: ftp: loaded support on port[0] = 21 [ 207.844937][ T9877] chnl_net:caif_netlink_parms(): no params data found [ 207.867830][ T9877] bridge0: port 1(bridge_slave_0) entered blocking state [ 207.875040][ T9877] bridge0: port 1(bridge_slave_0) entered disabled state [ 207.882648][ T9877] device bridge_slave_0 entered promiscuous mode [ 207.889918][ T9877] bridge0: port 2(bridge_slave_1) entered blocking state [ 207.896992][ T9877] bridge0: port 2(bridge_slave_1) entered disabled state [ 207.904709][ T9877] device bridge_slave_1 entered promiscuous mode [ 207.918249][ T9877] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 207.928470][ T9877] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 207.944086][ T9877] team0: Port device team_slave_0 added [ 207.951023][ T9877] team0: Port device team_slave_1 added [ 207.998655][ T9877] device hsr_slave_0 entered promiscuous mode [ 208.047497][ T9877] device hsr_slave_1 entered promiscuous mode [ 208.102277][ T9877] bridge0: port 2(bridge_slave_1) entered blocking state [ 208.109409][ T9877] bridge0: port 2(bridge_slave_1) entered forwarding state [ 208.116688][ T9877] bridge0: port 1(bridge_slave_0) entered blocking state [ 208.123763][ T9877] bridge0: port 1(bridge_slave_0) entered forwarding state [ 208.148378][ T9877] 8021q: adding VLAN 0 to HW filter on device bond0 [ 208.158564][ T3519] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 208.176741][ T3519] bridge0: port 1(bridge_slave_0) entered disabled state [ 208.184977][ T3519] bridge0: port 2(bridge_slave_1) entered disabled state [ 208.193183][ T3519] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 208.203140][ T9877] 8021q: adding VLAN 0 to HW filter on device team0 [ 208.212171][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 208.220729][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 208.227812][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 208.237613][ T3519] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 208.246290][ T3519] bridge0: port 2(bridge_slave_1) entered blocking state [ 208.253388][ T3519] bridge0: port 2(bridge_slave_1) entered forwarding state [ 208.266516][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 208.275230][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 208.285414][ T3519] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 208.296131][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 208.308129][ T3519] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 208.317637][ T9877] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 208.332874][ T9877] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 313.357045][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 313.363818][ C1] rcu: 1-...!: (10499 ticks this GP) idle=8fa/1/0x4000000000000002 softirq=9084/9084 fqs=3 [ 313.373944][ C1] (t=10500 jiffies g=9845 q=88) [ 313.378879][ C1] rcu: rcu_preempt kthread starved for 10494 jiffies! g9845 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 313.389956][ C1] rcu: RCU grace-period kthread stack dump: [ 313.395917][ C1] rcu_preempt R running task 29328 10 2 0x80004000 [ 313.403978][ C1] Call Trace: [ 313.407314][ C1] __schedule+0x755/0x1580 [ 313.411715][ C1] ? __sched_text_start+0x8/0x8 [ 313.416550][ C1] schedule+0xd9/0x260 [ 313.420618][ C1] schedule_timeout+0x486/0xc50 [ 313.425544][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 313.430475][ C1] ? usleep_range+0x170/0x170 [ 313.435134][ C1] ? trace_hardirqs_on+0x67/0x240 [ 313.440138][ C1] ? __kasan_check_read+0x11/0x20 [ 313.445144][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 313.450678][ C1] ? swake_up_one+0x60/0x60 [ 313.455165][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 313.459916][ C1] ? rcu_barrier+0x310/0x310 [ 313.464488][ C1] ? trace_hardirqs_on+0x67/0x240 [ 313.469493][ C1] ? __kasan_check_read+0x11/0x20 [ 313.474501][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 313.480724][ C1] ? __kthread_parkme+0x108/0x1c0 [ 313.485725][ C1] ? __kasan_check_read+0x11/0x20 [ 313.490726][ C1] kthread+0x361/0x430 [ 313.494788][ C1] ? rcu_barrier+0x310/0x310 [ 313.499359][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 313.505665][ C1] ret_from_fork+0x24/0x30 [ 313.510120][ C1] NMI backtrace for cpu 1 [ 313.514443][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc8+ #0 [ 313.521788][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 313.531819][ C1] Call Trace: [ 313.535081][ C1] [ 313.537947][ C1] dump_stack+0x172/0x1f0 [ 313.542258][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 313.547494][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 313.553834][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 313.559457][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 313.565434][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 313.571396][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 313.576493][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 313.582033][ C1] ? raise_softirq+0x138/0x340 [ 313.586784][ C1] update_process_times+0x32/0x80 [ 313.591789][ C1] tick_sched_handle+0xa2/0x190 [ 313.596617][ C1] tick_sched_timer+0x53/0x140 [ 313.601389][ C1] __hrtimer_run_queues+0x364/0xe40 [ 313.606670][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 313.611934][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 313.617630][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 313.623329][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 313.629375][ C1] hrtimer_interrupt+0x314/0x770 [ 313.634371][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 313.639901][ C1] apic_timer_interrupt+0xf/0x20 [ 313.644808][ C1] [ 313.647729][ C1] RIP: 0010:__list_add_valid+0x70/0xa0 [ 313.653172][ 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 [ 313.672766][ C1] RSP: 0018:ffff8880a990e980 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 313.681159][ C1] RAX: dffffc0000000000 RBX: ffff8880925c02f8 RCX: ffffffff85c66051 [ 313.689110][ C1] RDX: ffff8880925c0390 RSI: ffff8880925c0390 RDI: ffff8880925c0398 [ 313.697061][ C1] RBP: ffff8880a990e998 R08: ffff8880a9900440 R09: 0000000000000000 [ 313.705012][ C1] R10: fffffbfff134afaf R11: ffff8880a9900440 R12: ffff8880925c0390 [ 313.712966][ C1] R13: ffff8880925c02f8 R14: ffff8880925c0398 R15: ffff8880925c0390 [ 313.720979][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 313.725568][ C1] hhf_dequeue+0x66d/0xa20 [ 313.731063][ C1] __qdisc_run+0x1e7/0x19d0 [ 313.735586][ C1] ? dev_queue_xmit+0x18/0x20 [ 313.740258][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 313.745263][ C1] ? process_backlog+0x206/0x750 [ 313.750202][ C1] ? net_rx_action+0x4d6/0x1030 [ 313.755054][ C1] ? __do_softirq+0x262/0x98c [ 313.759716][ C1] ? run_ksoftirqd+0x8e/0x110 [ 313.764376][ C1] ? smpboot_thread_fn+0x6a3/0xa40 [ 313.769487][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 313.774806][ C1] ? quarantine_put+0x11c/0x1c0 [ 313.779656][ C1] ? trace_hardirqs_on+0x67/0x240 [ 313.784771][ C1] ? __skb_ext_put+0xd9/0x210 [ 313.789441][ C1] dev_queue_xmit+0x18/0x20 [ 313.793930][ C1] ? dev_queue_xmit+0x18/0x20 [ 313.798661][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 313.804032][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 313.808702][ C1] ? lock_downgrade+0x920/0x920 [ 313.813604][ C1] br_nf_dev_queue_xmit+0x34e/0x1470 [ 313.818877][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 313.824579][ C1] br_nf_post_routing+0x1502/0x1d30 [ 313.829773][ C1] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 313.835312][ C1] ? mark_held_locks+0xf0/0xf0 [ 313.840061][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 313.845876][ C1] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 313.851728][ C1] nf_hook_slow+0xbc/0x1e0 [ 313.856131][ C1] br_forward_finish+0x215/0x400 [ 313.861146][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.866860][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 313.871691][ C1] ? ip_vs_out+0x244/0x1700 [ 313.876200][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 313.881921][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 313.886501][ C1] ? should_fail+0x1de/0x852 [ 313.891086][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 313.896036][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.901572][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 313.906674][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.912205][ C1] ? br_nf_forward_finish+0x176/0xa90 [ 313.917580][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 313.923470][ C1] br_nf_forward_finish+0x66c/0xa90 [ 313.928669][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.934208][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 313.939251][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 313.944525][ C1] ? mark_held_locks+0xf0/0xf0 [ 313.949298][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 313.954479][ C1] ? __vlan_flush+0x120/0x120 [ 313.959143][ C1] nf_hook_slow+0xbc/0x1e0 [ 313.963725][ C1] __br_forward+0x393/0xb00 [ 313.968209][ C1] ? br_forward_finish+0x400/0x400 [ 313.973317][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 313.978862][ C1] deliver_clone+0x61/0xc0 [ 313.983271][ C1] br_flood+0x325/0x3d0 [ 313.987416][ C1] br_handle_frame_finish+0xb46/0x1670 [ 313.992863][ C1] ? br_handle_local_finish+0x20/0x20 [ 313.998221][ C1] ? audit_alloc_mark+0x3f0/0x500 [ 314.003227][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 314.008927][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 314.013500][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 314.018422][ C1] ? br_handle_local_finish+0x20/0x20 [ 314.023791][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 314.028904][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 314.035126][ C1] ? br_handle_local_finish+0x20/0x20 [ 314.040498][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 314.046382][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 314.052258][ C1] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 314.058250][ C1] ? br_handle_local_finish+0x20/0x20 [ 314.063655][ C1] br_nf_pre_routing_ipv6+0x456/0x832 [ 314.069044][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 314.074076][ C1] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 314.080399][ C1] ? br_nf_pre_routing+0x246/0x2355 [ 314.085593][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 314.092273][ C1] ? skb_pull_rcsum+0x155/0x300 [ 314.097132][ C1] br_nf_pre_routing+0x1743/0x2355 [ 314.102245][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 314.108221][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 314.114094][ C1] br_handle_frame+0x806/0x133e [ 314.119131][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 314.124849][ C1] ? kfree_skb+0x10e/0x3c0 [ 314.129269][ C1] ? br_handle_local_finish+0x20/0x20 [ 314.134631][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 314.140851][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 314.146552][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 314.152180][ C1] ? do_xdp_generic+0x50/0x50 [ 314.156904][ C1] ? ipv6_rcv+0x116/0x420 [ 314.161217][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 314.166695][ C1] ? debug_check_no_obj_freed+0x20a/0x43f [ 314.172424][ C1] ? __kasan_check_read+0x11/0x20 [ 314.177445][ C1] ? __update_load_avg_se+0x726/0xbc0 [ 314.182916][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 314.188711][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 314.194759][ C1] ? __kasan_check_write+0x14/0x20 [ 314.199869][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 314.205772][ C1] ? lock_acquire+0x190/0x410 [ 314.210449][ C1] ? process_backlog+0x195/0x750 [ 314.215409][ C1] __netif_receive_skb+0x2c/0x1d0 [ 314.220440][ C1] process_backlog+0x206/0x750 [ 314.225199][ C1] net_rx_action+0x4d6/0x1030 [ 314.229865][ C1] ? napi_complete_done+0x4b0/0x4b0 [ 314.235063][ C1] ? sched_clock+0x2e/0x50 [ 314.239501][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 314.245735][ C1] __do_softirq+0x262/0x98c [ 314.250235][ C1] ? takeover_tasklets+0x820/0x820 [ 314.256467][ C1] run_ksoftirqd+0x8e/0x110 [ 314.260964][ C1] smpboot_thread_fn+0x6a3/0xa40 [ 314.265913][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 314.272157][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 314.278375][ C1] ? __kthread_parkme+0x108/0x1c0 [ 314.283399][ C1] ? __kasan_check_read+0x11/0x20 [ 314.288418][ C1] kthread+0x361/0x430 [ 314.292495][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 314.298993][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 314.305316][ C1] ret_from_fork+0x24/0x30