[....] 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. [ 62.361889][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 62.361900][ T26] audit: type=1800 audit(1568391898.171:29): pid=9691 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 [ 62.388511][ T26] audit: type=1800 audit(1568391898.181:30): pid=9691 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 '10.128.0.171' (ECDSA) to the list of known hosts. syzkaller login: [ 76.173024][ T9842] IPVS: ftp: loaded support on port[0] = 21 [ 76.213523][ T9842] chnl_net:caif_netlink_parms(): no params data found [ 76.235828][ T9842] bridge0: port 1(bridge_slave_0) entered blocking state [ 76.243335][ T9842] bridge0: port 1(bridge_slave_0) entered disabled state [ 76.251321][ T9842] device bridge_slave_0 entered promiscuous mode [ 76.258903][ T9842] bridge0: port 2(bridge_slave_1) entered blocking state [ 76.266216][ T9842] bridge0: port 2(bridge_slave_1) entered disabled state [ 76.273806][ T9842] device bridge_slave_1 entered promiscuous mode [ 76.287787][ T9842] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 76.298194][ T9842] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 76.313684][ T9842] team0: Port device team_slave_0 added [ 76.320561][ T9842] team0: Port device team_slave_1 added [ 76.375656][ T9842] device hsr_slave_0 entered promiscuous mode [ 76.414259][ T9842] device hsr_slave_1 entered promiscuous mode [ 76.458999][ T9842] bridge0: port 2(bridge_slave_1) entered blocking state [ 76.466308][ T9842] bridge0: port 2(bridge_slave_1) entered forwarding state [ 76.473766][ T9842] bridge0: port 1(bridge_slave_0) entered blocking state [ 76.480888][ T9842] bridge0: port 1(bridge_slave_0) entered forwarding state [ 76.505271][ T9842] 8021q: adding VLAN 0 to HW filter on device bond0 [ 76.517392][ T9844] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 76.526160][ T9844] bridge0: port 1(bridge_slave_0) entered disabled state [ 76.533713][ T9844] bridge0: port 2(bridge_slave_1) entered disabled state [ 76.541553][ T9844] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 76.551319][ T9842] 8021q: adding VLAN 0 to HW filter on device team0 [ 76.560763][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 76.569504][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 76.576577][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 76.594563][ T9845] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 76.603323][ T9845] bridge0: port 2(bridge_slave_1) entered blocking state [ 76.610414][ T9845] bridge0: port 2(bridge_slave_1) entered forwarding state [ 76.618371][ T9845] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 76.627576][ T9845] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 76.636228][ T9845] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 76.646313][ T9845] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 76.654090][ T9845] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 76.664090][ T9842] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 76.678762][ T9842] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 181.693846][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 181.700487][ C1] rcu: 1-...!: (10499 ticks this GP) idle=eaa/1/0x4000000000000002 softirq=10456/10456 fqs=24 [ 181.710896][ C1] (t=10500 jiffies g=8913 q=106) [ 181.715903][ C1] rcu: rcu_preempt kthread starved for 10452 jiffies! g8913 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 181.726975][ C1] rcu: RCU grace-period kthread stack dump: [ 181.732851][ C1] rcu_preempt R running task 29328 10 2 0x80004000 [ 181.740735][ C1] Call Trace: [ 181.744015][ C1] __schedule+0x755/0x1580 [ 181.748414][ C1] ? __sched_text_start+0x8/0x8 [ 181.753249][ C1] schedule+0xd9/0x260 [ 181.757298][ C1] schedule_timeout+0x486/0xc50 [ 181.762143][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 181.767062][ C1] ? usleep_range+0x170/0x170 [ 181.771822][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.776835][ C1] ? __kasan_check_read+0x11/0x20 [ 181.781840][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 181.787367][ C1] ? swake_up_one+0x60/0x60 [ 181.791854][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 181.796599][ C1] ? rcu_barrier+0x310/0x310 [ 181.801166][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.806171][ C1] ? __kasan_check_read+0x11/0x20 [ 181.811195][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 181.817417][ C1] ? __kthread_parkme+0x108/0x1c0 [ 181.822418][ C1] ? __kasan_check_read+0x11/0x20 [ 181.827422][ C1] kthread+0x361/0x430 [ 181.831566][ C1] ? rcu_barrier+0x310/0x310 [ 181.836134][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 181.842355][ C1] ret_from_fork+0x24/0x30 [ 181.846757][ C1] NMI backtrace for cpu 1 [ 181.851070][ C1] CPU: 1 PID: 9845 Comm: kworker/1:3 Not tainted 5.3.0-rc8+ #0 [ 181.858587][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 181.868635][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 181.874589][ C1] Call Trace: [ 181.877864][ C1] [ 181.880710][ C1] dump_stack+0x172/0x1f0 [ 181.885021][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 181.890201][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 181.896422][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 181.902032][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 181.908005][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 181.913880][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 181.918980][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 181.924516][ C1] ? raise_softirq+0x138/0x340 [ 181.929262][ C1] update_process_times+0x32/0x80 [ 181.934705][ C1] tick_sched_handle+0xa2/0x190 [ 181.939541][ C1] tick_sched_timer+0x53/0x140 [ 181.944283][ C1] __hrtimer_run_queues+0x364/0xe40 [ 181.949462][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 181.954727][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 181.960250][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 181.965953][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 181.971995][ C1] hrtimer_interrupt+0x314/0x770 [ 181.976926][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 181.982459][ C1] apic_timer_interrupt+0xf/0x20 [ 181.987370][ C1] [ 181.990295][ C1] RIP: 0010:__list_del_entry_valid+0x10/0xf5 [ 181.996254][ C1] Code: 6e fe 48 8b 75 e8 eb 9f 48 89 f7 48 89 75 e8 e8 e6 47 6e fe 48 8b 75 e8 eb b2 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 <49> 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 80 3c 02 00 [ 182.015830][ C1] RSP: 0018:ffff8880873bed40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 182.024227][ C1] RAX: dffffc0000000000 RBX: ffff8880943f0778 RCX: ffffffff85c65b39 [ 182.032181][ C1] RDX: 0000000000000000 RSI: ffffffff85c66006 RDI: ffff8880943f0778 [ 182.040129][ C1] RBP: ffff8880873bed48 R08: ffff88809acf84c0 R09: 0000000000000000 [ 182.048076][ C1] R10: fffffbfff134afaf R11: ffff88809acf84c0 R12: dffffc0000000000 [ 182.056026][ C1] R13: ffff8880943f0480 R14: 0000000000000000 R15: 0000000000000000 [ 182.063983][ C1] ? hhf_dequeue+0xb9/0xa20 [ 182.068474][ C1] ? hhf_dequeue+0x586/0xa20 [ 182.073044][ C1] hhf_dequeue+0x5c5/0xa20 [ 182.077443][ C1] __qdisc_run+0x1e7/0x19d0 [ 182.081936][ C1] ? dev_queue_xmit+0x18/0x20 [ 182.086604][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 182.091603][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 182.096954][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 182.102217][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 182.108432][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 182.113697][ C1] ? br_forward_finish+0x235/0x400 [ 182.118787][ C1] ? __kasan_check_read+0x11/0x20 [ 182.123787][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 182.128966][ C1] dev_queue_xmit+0x18/0x20 [ 182.133447][ C1] ? dev_queue_xmit+0x18/0x20 [ 182.138100][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 182.143450][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 182.148016][ C1] br_forward_finish+0xfa/0x400 [ 182.152844][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 182.158368][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 182.163109][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 182.168815][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 182.173384][ C1] __br_forward+0x641/0xb00 [ 182.177868][ C1] ? br_forward_finish+0x400/0x400 [ 182.182977][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 182.188511][ C1] deliver_clone+0x61/0xc0 [ 182.192905][ C1] maybe_deliver+0x2c7/0x390 [ 182.197480][ C1] br_flood+0x13a/0x3d0 [ 182.201617][ C1] br_dev_xmit+0x98c/0x15a0 [ 182.206101][ C1] ? br_poll_controller+0x10/0x10 [ 182.211103][ C1] ? netif_skb_features+0x6c2/0xb90 [ 182.216284][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 182.221548][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 182.227763][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 182.232937][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 182.237854][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 182.244070][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 182.249162][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 182.255379][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 182.260381][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 182.265470][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 182.270731][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 182.276077][ C1] ? __kasan_check_read+0x11/0x20 [ 182.281081][ C1] ? lock_downgrade+0x920/0x920 [ 182.285914][ C1] dev_queue_xmit+0x18/0x20 [ 182.290392][ C1] ? dev_queue_xmit+0x18/0x20 [ 182.295046][ C1] neigh_resolve_output+0x5a5/0x970 [ 182.300232][ C1] ip6_finish_output2+0x1034/0x2520 [ 182.305408][ C1] ? ip6_forward_finish+0x530/0x530 [ 182.310583][ C1] ? lock_downgrade+0x920/0x920 [ 182.315422][ C1] ? ip6_mtu+0x16f/0x460 [ 182.319643][ C1] __ip6_finish_output+0x444/0xa50 [ 182.324733][ C1] ? __ip6_finish_output+0x444/0xa50 [ 182.329996][ C1] ip6_finish_output+0x38/0x1f0 [ 182.334820][ C1] ip6_output+0x235/0x7c0 [ 182.339128][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 182.344218][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 182.349478][ C1] ? ndisc_send_skb+0x803/0x1450 [ 182.354395][ C1] ndisc_send_skb+0xf29/0x1450 [ 182.359138][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 182.364415][ C1] ? skb_set_owner_w+0x21b/0x320 [ 182.369332][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 182.375029][ C1] ndisc_send_ns+0x3a9/0x850 [ 182.379594][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 182.385812][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 182.390987][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 182.396164][ C1] ? trace_hardirqs_on+0x67/0x240 [ 182.401164][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 182.406340][ C1] addrconf_dad_work+0xb88/0x1150 [ 182.411343][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 182.416866][ C1] ? lock_acquire+0x190/0x410 [ 182.421516][ C1] ? trace_hardirqs_on+0x67/0x240 [ 182.426531][ C1] process_one_work+0x9af/0x1740 [ 182.431476][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 182.436832][ C1] ? lock_acquire+0x190/0x410 [ 182.441493][ C1] worker_thread+0x98/0xe40 [ 182.445980][ C1] ? trace_hardirqs_on+0x67/0x240 [ 182.450991][ C1] kthread+0x361/0x430 [ 182.455040][ C1] ? process_one_work+0x1740/0x1740 [ 182.460216][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 182.466437][ C1] ret_from_fork+0x24/0x30