[....] 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. [ 64.593002][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.593012][ T26] audit: type=1800 audit(1568385854.365:29): pid=9645 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 [ 64.619354][ T26] audit: type=1800 audit(1568385854.365:30): pid=9645 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 '10.128.0.37' (ECDSA) to the list of known hosts. syzkaller login: [ 140.436063][ T9798] IPVS: ftp: loaded support on port[0] = 21 [ 140.480147][ T9798] chnl_net:caif_netlink_parms(): no params data found [ 140.502918][ T9798] bridge0: port 1(bridge_slave_0) entered blocking state [ 140.510455][ T9798] bridge0: port 1(bridge_slave_0) entered disabled state [ 140.518305][ T9798] device bridge_slave_0 entered promiscuous mode [ 140.525873][ T9798] bridge0: port 2(bridge_slave_1) entered blocking state [ 140.532990][ T9798] bridge0: port 2(bridge_slave_1) entered disabled state [ 140.540832][ T9798] device bridge_slave_1 entered promiscuous mode [ 140.555062][ T9798] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 140.565257][ T9798] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 140.581448][ T9798] team0: Port device team_slave_0 added [ 140.588568][ T9798] team0: Port device team_slave_1 added [ 140.666603][ T9798] device hsr_slave_0 entered promiscuous mode [ 140.725185][ T9798] device hsr_slave_1 entered promiscuous mode [ 140.770490][ T9798] bridge0: port 2(bridge_slave_1) entered blocking state [ 140.777609][ T9798] bridge0: port 2(bridge_slave_1) entered forwarding state [ 140.785004][ T9798] bridge0: port 1(bridge_slave_0) entered blocking state [ 140.792091][ T9798] bridge0: port 1(bridge_slave_0) entered forwarding state [ 140.817096][ T9798] 8021q: adding VLAN 0 to HW filter on device bond0 [ 140.828236][ T9800] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 140.846672][ T9800] bridge0: port 1(bridge_slave_0) entered disabled state [ 140.854354][ T9800] bridge0: port 2(bridge_slave_1) entered disabled state [ 140.862262][ T9800] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 140.872392][ T9798] 8021q: adding VLAN 0 to HW filter on device team0 [ 140.881775][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 140.891572][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 140.898694][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 140.915905][ T9800] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 140.924323][ T9800] bridge0: port 2(bridge_slave_1) entered blocking state [ 140.931411][ T9800] bridge0: port 2(bridge_slave_1) entered forwarding state [ 140.939720][ T9800] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 140.948175][ T9800] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 140.957260][ T9800] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 140.965866][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 140.975433][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 140.985203][ T9798] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 141.000206][ T9798] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 246.024810][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 246.031583][ C1] rcu: 1-...!: (10499 ticks this GP) idle=26e/1/0x4000000000000002 softirq=9911/9911 fqs=41 [ 246.041803][ C1] (t=10500 jiffies g=8985 q=88) [ 246.046722][ C1] rcu: rcu_preempt kthread starved for 10418 jiffies! g8985 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 246.058292][ C1] rcu: RCU grace-period kthread stack dump: [ 246.064167][ C1] rcu_preempt I29392 10 2 0x80004000 [ 246.070574][ C1] Call Trace: [ 246.073861][ C1] __schedule+0x755/0x1580 [ 246.078263][ C1] ? __sched_text_start+0x8/0x8 [ 246.083094][ C1] schedule+0xd9/0x260 [ 246.087142][ C1] schedule_timeout+0x486/0xc50 [ 246.091971][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 246.096897][ C1] ? usleep_range+0x170/0x170 [ 246.101565][ C1] ? trace_hardirqs_on+0x67/0x240 [ 246.106572][ C1] ? __kasan_check_read+0x11/0x20 [ 246.111579][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 246.117103][ C1] ? swake_up_one+0x60/0x60 [ 246.121587][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 246.126331][ C1] ? rcu_barrier+0x310/0x310 [ 246.130896][ C1] ? trace_hardirqs_on+0x67/0x240 [ 246.135908][ C1] ? __kasan_check_read+0x11/0x20 [ 246.140942][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 246.147178][ C1] ? __kthread_parkme+0x108/0x1c0 [ 246.152191][ C1] ? __kasan_check_read+0x11/0x20 [ 246.157194][ C1] kthread+0x361/0x430 [ 246.161243][ C1] ? rcu_barrier+0x310/0x310 [ 246.165820][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 246.172301][ C1] ret_from_fork+0x24/0x30 [ 246.176896][ C1] NMI backtrace for cpu 1 [ 246.181228][ C1] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.3.0-rc8+ #0 [ 246.188570][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 246.198632][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 246.204597][ C1] Call Trace: [ 246.207865][ C1] [ 246.210717][ C1] dump_stack+0x172/0x1f0 [ 246.215027][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 246.220206][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 246.226429][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 246.232051][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 246.238013][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 246.243884][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 246.248981][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 246.254509][ C1] ? raise_softirq+0x138/0x340 [ 246.259342][ C1] update_process_times+0x32/0x80 [ 246.264350][ C1] tick_sched_handle+0xa2/0x190 [ 246.269190][ C1] tick_sched_timer+0x53/0x140 [ 246.273939][ C1] __hrtimer_run_queues+0x364/0xe40 [ 246.279335][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 246.284602][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 246.290127][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 246.295834][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 246.301880][ C1] hrtimer_interrupt+0x314/0x770 [ 246.306802][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 246.312328][ C1] apic_timer_interrupt+0xf/0x20 [ 246.317238][ C1] [ 246.320175][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 [ 246.326232][ C1] Code: 19 09 41 bc f4 ff ff ff e8 6d 9f e9 ff 48 c7 05 de 4c 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 c4 88 8f 7e 81 e2 00 01 1f 00 [ 246.345898][ C1] RSP: 0018:ffff8880a9a46d48 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 [ 246.354293][ C1] RAX: ffff8880921de768 RBX: ffff8880921de778 RCX: ffffffff85c65b39 [ 246.362251][ C1] RDX: ffff8880921de740 RSI: ffffffff85c65fb7 RDI: 0000000000000005 [ 246.370209][ C1] RBP: ffff8880a9a46d48 R08: ffff8880a9a3a5c0 R09: 0000000000000000 [ 246.378163][ C1] R10: fffffbfff134afaf R11: ffff8880a9a3a5c0 R12: dffffc0000000000 [ 246.386167][ C1] R13: ffff8880921de480 R14: 0000000000000001 R15: 0000000000000000 [ 246.394580][ C1] ? hhf_dequeue+0xb9/0xa20 [ 246.399061][ C1] ? hhf_dequeue+0x537/0xa20 [ 246.403645][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 246.409868][ C1] hhf_dequeue+0x552/0xa20 [ 246.414269][ C1] __qdisc_run+0x1e7/0x19d0 [ 246.418754][ C1] ? dev_queue_xmit+0x18/0x20 [ 246.423416][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 246.428423][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 246.433777][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 246.439057][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 246.445277][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 246.450545][ C1] ? br_forward_finish+0x235/0x400 [ 246.455633][ C1] ? __kasan_check_read+0x11/0x20 [ 246.460637][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 246.465832][ C1] dev_queue_xmit+0x18/0x20 [ 246.470335][ C1] ? dev_queue_xmit+0x18/0x20 [ 246.475031][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 246.480597][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 246.485172][ C1] br_forward_finish+0xfa/0x400 [ 246.490006][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 246.495539][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 246.500291][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 246.506003][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 246.510572][ C1] __br_forward+0x641/0xb00 [ 246.515053][ C1] ? br_forward_finish+0x400/0x400 [ 246.520143][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 246.525670][ C1] deliver_clone+0x61/0xc0 [ 246.530064][ C1] maybe_deliver+0x2c7/0x390 [ 246.534632][ C1] br_flood+0x13a/0x3d0 [ 246.538770][ C1] br_dev_xmit+0x98c/0x15a0 [ 246.543277][ C1] ? br_poll_controller+0x10/0x10 [ 246.548290][ C1] ? netif_skb_features+0x6c2/0xb90 [ 246.553479][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 246.558763][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 246.564996][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 246.570184][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 246.575112][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 246.581434][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 246.587049][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 246.593268][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 246.598283][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 246.603375][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 246.608646][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 246.613995][ C1] ? __kasan_check_read+0x11/0x20 [ 246.619002][ C1] ? lock_downgrade+0x920/0x920 [ 246.623841][ C1] dev_queue_xmit+0x18/0x20 [ 246.628329][ C1] ? dev_queue_xmit+0x18/0x20 [ 246.632995][ C1] neigh_resolve_output+0x5a5/0x970 [ 246.638174][ C1] ip6_finish_output2+0x1034/0x2520 [ 246.643358][ C1] ? ip6_forward_finish+0x530/0x530 [ 246.648536][ C1] ? lock_downgrade+0x920/0x920 [ 246.653365][ C1] ? ip6_mtu+0x16f/0x460 [ 246.657685][ C1] __ip6_finish_output+0x444/0xa50 [ 246.662788][ C1] ? __ip6_finish_output+0x444/0xa50 [ 246.668057][ C1] ip6_finish_output+0x38/0x1f0 [ 246.672892][ C1] ip6_output+0x235/0x7c0 [ 246.677203][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 246.682291][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 246.687555][ C1] ? ndisc_send_skb+0x803/0x1450 [ 246.692471][ C1] ndisc_send_skb+0xf29/0x1450 [ 246.697213][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 246.702480][ C1] ? skb_set_owner_w+0x21b/0x320 [ 246.707398][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 246.713136][ C1] ndisc_send_ns+0x3a9/0x850 [ 246.717705][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 246.723926][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 246.729101][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 246.734392][ C1] ? trace_hardirqs_on+0x67/0x240 [ 246.739412][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 246.744592][ C1] addrconf_dad_work+0xb88/0x1150 [ 246.749614][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 246.755150][ C1] ? lock_acquire+0x190/0x410 [ 246.759817][ C1] ? trace_hardirqs_on+0x67/0x240 [ 246.764830][ C1] process_one_work+0x9af/0x1740 [ 246.769754][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 246.775103][ C1] ? lock_acquire+0x190/0x410 [ 246.779935][ C1] worker_thread+0x98/0xe40 [ 246.784424][ C1] kthread+0x361/0x430 [ 246.788470][ C1] ? process_one_work+0x1740/0x1740 [ 246.793647][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 246.799871][ C1] ret_from_fork+0x24/0x30