[....] 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. [ 64.047177][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.047187][ T26] audit: type=1800 audit(1568246227.334:29): pid=9642 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 [ 64.081086][ T26] audit: type=1800 audit(1568246227.334:30): pid=9642 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 '10.128.10.57' (ECDSA) to the list of known hosts. syzkaller login: [ 337.503842][ T9795] IPVS: ftp: loaded support on port[0] = 21 [ 337.550984][ T9795] chnl_net:caif_netlink_parms(): no params data found [ 337.572265][ T9795] bridge0: port 1(bridge_slave_0) entered blocking state [ 337.579900][ T9795] bridge0: port 1(bridge_slave_0) entered disabled state [ 337.587523][ T9795] device bridge_slave_0 entered promiscuous mode [ 337.594732][ T9795] bridge0: port 2(bridge_slave_1) entered blocking state [ 337.602022][ T9795] bridge0: port 2(bridge_slave_1) entered disabled state [ 337.609593][ T9795] device bridge_slave_1 entered promiscuous mode [ 337.622933][ T9795] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 337.633794][ T9795] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 337.650056][ T9795] team0: Port device team_slave_0 added [ 337.656619][ T9795] team0: Port device team_slave_1 added [ 337.708178][ T9795] device hsr_slave_0 entered promiscuous mode [ 337.776539][ T9795] device hsr_slave_1 entered promiscuous mode [ 337.831627][ T9795] bridge0: port 2(bridge_slave_1) entered blocking state [ 337.838751][ T9795] bridge0: port 2(bridge_slave_1) entered forwarding state [ 337.846057][ T9795] bridge0: port 1(bridge_slave_0) entered blocking state [ 337.853159][ T9795] bridge0: port 1(bridge_slave_0) entered forwarding state [ 337.878095][ T9795] 8021q: adding VLAN 0 to HW filter on device bond0 [ 337.889726][ T9798] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 337.898093][ T9798] bridge0: port 1(bridge_slave_0) entered disabled state [ 337.905582][ T9798] bridge0: port 2(bridge_slave_1) entered disabled state [ 337.913520][ T9798] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 337.923231][ T9795] 8021q: adding VLAN 0 to HW filter on device team0 [ 337.932962][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 337.941407][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 337.948463][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 337.958082][ T9798] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 337.966965][ T9798] bridge0: port 2(bridge_slave_1) entered blocking state [ 337.974093][ T9798] bridge0: port 2(bridge_slave_1) entered forwarding state [ 337.991581][ T9795] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 338.002062][ T9795] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 338.014281][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 338.022975][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 338.031310][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 338.040152][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 338.048366][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 338.055850][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 338.070241][ T9795] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 443.136247][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 443.142907][ C1] rcu: 1-...!: (1 GPs behind) idle=5c2/1/0x4000000000000002 softirq=9873/9879 fqs=30 [ 443.152511][ C1] (t=10500 jiffies g=9409 q=64) [ 443.157430][ C1] rcu: rcu_preempt kthread starved for 10440 jiffies! g9409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 443.168681][ C1] rcu: RCU grace-period kthread stack dump: [ 443.174557][ C1] rcu_preempt I29392 10 2 0x80004000 [ 443.180876][ C1] Call Trace: [ 443.184228][ C1] __schedule+0x755/0x1580 [ 443.188632][ C1] ? __sched_text_start+0x8/0x8 [ 443.193463][ C1] schedule+0xd9/0x260 [ 443.197523][ C1] schedule_timeout+0x486/0xc50 [ 443.202351][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 443.207275][ C1] ? usleep_range+0x170/0x170 [ 443.211929][ C1] ? trace_hardirqs_on+0x67/0x240 [ 443.216944][ C1] ? __kasan_check_read+0x11/0x20 [ 443.221964][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 443.227502][ C1] ? swake_up_one+0x60/0x60 [ 443.231995][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 443.236758][ C1] ? rcu_barrier+0x310/0x310 [ 443.241325][ C1] ? trace_hardirqs_on+0x67/0x240 [ 443.246327][ C1] ? __kasan_check_read+0x11/0x20 [ 443.251340][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 443.257562][ C1] ? __kthread_parkme+0x108/0x1c0 [ 443.262562][ C1] ? __kasan_check_read+0x11/0x20 [ 443.267575][ C1] kthread+0x361/0x430 [ 443.271638][ C1] ? rcu_barrier+0x310/0x310 [ 443.276203][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 443.282429][ C1] ret_from_fork+0x24/0x30 [ 443.286849][ C1] NMI backtrace for cpu 1 [ 443.291169][ C1] CPU: 1 PID: 9798 Comm: kworker/1:0 Not tainted 5.3.0-rc8+ #0 [ 443.298683][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 443.308818][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 443.314778][ C1] Call Trace: [ 443.318045][ C1] [ 443.320916][ C1] dump_stack+0x172/0x1f0 [ 443.325233][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 443.330419][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 443.336645][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 443.342259][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 443.348227][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 443.354100][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 443.359197][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 443.364722][ C1] ? raise_softirq+0x138/0x340 [ 443.369477][ C1] update_process_times+0x32/0x80 [ 443.374483][ C1] tick_sched_handle+0xa2/0x190 [ 443.379317][ C1] tick_sched_timer+0x53/0x140 [ 443.384074][ C1] __hrtimer_run_queues+0x364/0xe40 [ 443.389252][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 443.394515][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 443.400053][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 443.405753][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 443.411805][ C1] hrtimer_interrupt+0x314/0x770 [ 443.416764][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 443.422298][ C1] apic_timer_interrupt+0xf/0x20 [ 443.427209][ C1] [ 443.430130][ C1] RIP: 0010:__list_del_entry_valid+0x26/0xf5 [ 443.436089][ C1] Code: 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 <0f> 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 48 b8 00 00 00 00 00 fc ff [ 443.455671][ C1] RSP: 0018:ffff8880960b6d30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 443.464063][ C1] RAX: dffffc0000000000 RBX: ffff8880982b30b8 RCX: ffffffff85c65b39 [ 443.472013][ C1] RDX: 1ffff11013056618 RSI: ffffffff85c66006 RDI: ffff8880982b30c0 [ 443.479971][ C1] RBP: ffff8880960b6d48 R08: ffff8880a350e6c0 R09: 0000000000000000 [ 443.487921][ C1] R10: fffffbfff134afaf R11: ffff8880a350e6c0 R12: dffffc0000000000 [ 443.495870][ C1] R13: ffff8880982b2dc0 R14: ffff8880982b30b8 R15: 0000000000000000 [ 443.503892][ C1] ? hhf_dequeue+0xb9/0xa20 [ 443.508385][ C1] ? hhf_dequeue+0x586/0xa20 [ 443.512965][ C1] hhf_dequeue+0x5c5/0xa20 [ 443.517402][ C1] __qdisc_run+0x1e7/0x19d0 [ 443.521909][ C1] ? dev_queue_xmit+0x18/0x20 [ 443.526701][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 443.531730][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 443.537096][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 443.542373][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 443.548659][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 443.553945][ C1] ? br_forward_finish+0x235/0x400 [ 443.559036][ C1] ? __kasan_check_read+0x11/0x20 [ 443.564037][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 443.569216][ C1] dev_queue_xmit+0x18/0x20 [ 443.573696][ C1] ? dev_queue_xmit+0x18/0x20 [ 443.578354][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 443.583753][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 443.588325][ C1] br_forward_finish+0xfa/0x400 [ 443.593155][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 443.598695][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 443.603450][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 443.609252][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 443.613820][ C1] __br_forward+0x641/0xb00 [ 443.618300][ C1] ? br_forward_finish+0x400/0x400 [ 443.623911][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 443.629436][ C1] deliver_clone+0x61/0xc0 [ 443.633828][ C1] maybe_deliver+0x2c7/0x390 [ 443.638406][ C1] br_flood+0x13a/0x3d0 [ 443.642590][ C1] br_dev_xmit+0x98c/0x15a0 [ 443.647076][ C1] ? br_poll_controller+0x10/0x10 [ 443.652080][ C1] ? netif_skb_features+0x6c2/0xb90 [ 443.657328][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 443.662595][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 443.668844][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 443.674027][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 443.678944][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 443.685178][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 443.690267][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 443.696487][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 443.701536][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 443.706631][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 443.713456][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 443.718805][ C1] ? __kasan_check_read+0x11/0x20 [ 443.723808][ C1] ? lock_downgrade+0x920/0x920 [ 443.728640][ C1] dev_queue_xmit+0x18/0x20 [ 443.733121][ C1] ? dev_queue_xmit+0x18/0x20 [ 443.737816][ C1] neigh_resolve_output+0x5a5/0x970 [ 443.742995][ C1] ip6_finish_output2+0x1034/0x2520 [ 443.748173][ C1] ? ip6_forward_finish+0x530/0x530 [ 443.753348][ C1] ? lock_downgrade+0x920/0x920 [ 443.758177][ C1] ? ip6_mtu+0x16f/0x460 [ 443.762399][ C1] __ip6_finish_output+0x444/0xa50 [ 443.767487][ C1] ? __ip6_finish_output+0x444/0xa50 [ 443.772751][ C1] ip6_finish_output+0x38/0x1f0 [ 443.777577][ C1] ip6_output+0x235/0x7c0 [ 443.781882][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 443.786969][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 443.792229][ C1] ? ndisc_send_skb+0x803/0x1450 [ 443.797148][ C1] ndisc_send_skb+0xf29/0x1450 [ 443.801902][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 443.807218][ C1] ? skb_set_owner_w+0x21b/0x320 [ 443.812135][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 443.817833][ C1] ndisc_send_ns+0x3a9/0x850 [ 443.822401][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 443.828622][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 443.833808][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 443.838984][ C1] ? trace_hardirqs_on+0x67/0x240 [ 443.843985][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 443.849168][ C1] addrconf_dad_work+0xb88/0x1150 [ 443.854172][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 443.859715][ C1] ? lock_acquire+0x190/0x410 [ 443.864370][ C1] ? trace_hardirqs_on+0x67/0x240 [ 443.869373][ C1] process_one_work+0x9af/0x1740 [ 443.874291][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 443.879658][ C1] ? lock_acquire+0x190/0x410 [ 443.884337][ C1] worker_thread+0x98/0xe40 [ 443.888834][ C1] ? trace_hardirqs_on+0x67/0x240 [ 443.893845][ C1] kthread+0x361/0x430 [ 443.897894][ C1] ? process_one_work+0x1740/0x1740 [ 443.903069][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 443.909291][ C1] ret_from_fork+0x24/0x30