[ 51.177719][ T26] audit: type=1800 audit(1568392790.877:22): pid=8939 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2447 res=0 [ 51.209149][ T26] audit: type=1800 audit(1568392790.877:23): pid=8939 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2442 res=0 [....] Starting enhanced syslogd: rsyslogd[ 51.584905][ T8964] rsyslogd (8964) used greatest stack depth: 24168 bytes left [?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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. syzkaller login: [ 221.027133][ T9090] IPVS: ftp: loaded support on port[0] = 21 [ 221.064300][ T9090] chnl_net:caif_netlink_parms(): no params data found [ 221.083612][ T9090] bridge0: port 1(bridge_slave_0) entered blocking state [ 221.090897][ T9090] bridge0: port 1(bridge_slave_0) entered disabled state [ 221.098293][ T9090] device bridge_slave_0 entered promiscuous mode [ 221.105221][ T9090] bridge0: port 2(bridge_slave_1) entered blocking state [ 221.112539][ T9090] bridge0: port 2(bridge_slave_1) entered disabled state [ 221.120066][ T9090] device bridge_slave_1 entered promiscuous mode [ 221.131675][ T9090] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 221.141769][ T9090] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 221.156208][ T9090] team0: Port device team_slave_0 added [ 221.162458][ T9090] team0: Port device team_slave_1 added [ 221.217635][ T9090] device hsr_slave_0 entered promiscuous mode [ 221.276497][ T9090] device hsr_slave_1 entered promiscuous mode [ 221.340426][ T9090] bridge0: port 2(bridge_slave_1) entered blocking state [ 221.347590][ T9090] bridge0: port 2(bridge_slave_1) entered forwarding state [ 221.354834][ T9090] bridge0: port 1(bridge_slave_0) entered blocking state [ 221.361895][ T9090] bridge0: port 1(bridge_slave_0) entered forwarding state [ 221.382463][ T9090] 8021q: adding VLAN 0 to HW filter on device bond0 [ 221.391653][ T3614] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 221.410519][ T3614] bridge0: port 1(bridge_slave_0) entered disabled state [ 221.418405][ T3614] bridge0: port 2(bridge_slave_1) entered disabled state [ 221.425818][ T3614] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 221.436057][ T9090] 8021q: adding VLAN 0 to HW filter on device team0 [ 221.444519][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 221.452840][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 221.459874][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 221.468993][ T3614] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 221.477602][ T3614] bridge0: port 2(bridge_slave_1) entered blocking state [ 221.484625][ T3614] bridge0: port 2(bridge_slave_1) entered forwarding state [ 221.499744][ T9090] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 221.510374][ T9090] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 221.522618][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 221.531068][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 221.539255][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 221.547829][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 221.555764][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 221.563273][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 221.576188][ T9090] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 326.786291][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 326.792953][ C1] rcu: 1-...!: (1 GPs behind) idle=38a/1/0x4000000000000002 softirq=9356/9357 fqs=16 [ 326.802550][ C1] (t=10500 jiffies g=6609 q=236) [ 326.807562][ C1] rcu: rcu_preempt kthread starved for 10468 jiffies! g6609 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 326.818641][ C1] rcu: RCU grace-period kthread stack dump: [ 326.824529][ C1] rcu_preempt R running task 29128 10 2 0x80004000 [ 326.832446][ C1] Call Trace: [ 326.835817][ C1] __schedule+0x877/0xc50 [ 326.840126][ C1] schedule+0x131/0x1e0 [ 326.844263][ C1] schedule_timeout+0x14f/0x240 [ 326.849139][ C1] ? run_local_timers+0x120/0x120 [ 326.854155][ C1] rcu_gp_kthread+0xef8/0x1790 [ 326.858915][ C1] kthread+0x332/0x350 [ 326.862960][ C1] ? rcu_report_qs_rsp+0x150/0x150 [ 326.868043][ C1] ? kthread_blkcg+0xe0/0xe0 [ 326.872663][ C1] ret_from_fork+0x24/0x30 [ 326.877064][ C1] NMI backtrace for cpu 1 [ 326.881393][ C1] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.3.0-rc8+ #0 [ 326.889859][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 326.899968][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 326.905935][ C1] Call Trace: [ 326.909195][ C1] [ 326.912069][ C1] dump_stack+0x1d8/0x2f8 [ 326.916376][ C1] nmi_cpu_backtrace+0xaf/0x1a0 [ 326.921198][ C1] ? nmi_trigger_cpumask_backtrace+0x16d/0x290 [ 326.927369][ C1] ? arch_trigger_cpumask_backtrace+0x20/0x20 [ 326.933409][ C1] nmi_trigger_cpumask_backtrace+0x174/0x290 [ 326.939369][ C1] arch_trigger_cpumask_backtrace+0x10/0x20 [ 326.945930][ C1] rcu_dump_cpu_stacks+0x15a/0x220 [ 326.951015][ C1] rcu_sched_clock_irq+0xb95/0x16d0 [ 326.956222][ C1] ? trace_hardirqs_off+0x74/0x80 [ 326.961222][ C1] update_process_times+0x134/0x190 [ 326.966417][ C1] tick_sched_timer+0x263/0x420 [ 326.971253][ C1] ? tick_setup_sched_timer+0x2c0/0x2c0 [ 326.976782][ C1] __hrtimer_run_queues+0x403/0x850 [ 326.981969][ C1] hrtimer_interrupt+0x38c/0xda0 [ 326.986888][ C1] smp_apic_timer_interrupt+0x109/0x280 [ 326.992407][ C1] apic_timer_interrupt+0xf/0x20 [ 326.997314][ C1] [ 327.000269][ C1] RIP: 0010:__list_add_valid+0x6/0xc0 [ 327.005621][ C1] Code: 1f fe 0f 0b 55 48 89 e5 53 48 89 fb e8 23 ca 1f fe 48 c7 c7 e6 4d 3f 88 48 89 de e8 44 fd ff ff 5b 5d c3 90 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 49 89 d6 49 89 f4 49 89 ff 49 bd 00 00 00 00 [ 327.025197][ C1] RSP: 0018:ffff8880a98ff1c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 327.034362][ C1] RAX: 1ffff1101305c90a RBX: 1ffff1101305c90b RCX: ffff8880a98f4480 [ 327.042394][ C1] RDX: ffff8880982e4850 RSI: ffff8880982e4850 RDI: ffff8880982e47b8 [ 327.050425][ C1] RBP: ffff8880a98ff1c8 R08: ffffffff860c5d6a R09: 0000000000000000 [ 327.058369][ C1] R10: fffffbfff117be8d R11: 0000000000000000 R12: dffffc0000000000 [ 327.066328][ C1] R13: ffff8880982e44c0 R14: ffff8880982e4850 R15: ffff8880982e4840 [ 327.074351][ C1] ? hhf_dequeue+0x15a/0xaa0 [ 327.078929][ C1] hhf_dequeue+0x535/0xaa0 [ 327.083320][ C1] ? hhf_enqueue+0x19dc/0x2110 [ 327.088166][ C1] __qdisc_run+0x217/0x1b30 [ 327.092668][ C1] ? dev_queue_xmit+0x17/0x20 [ 327.097327][ C1] __dev_queue_xmit+0x1161/0x3020 [ 327.102335][ C1] dev_queue_xmit+0x17/0x20 [ 327.106842][ C1] br_dev_queue_push_xmit+0x551/0x650 [ 327.112187][ C1] ? fdb_add_hw_addr+0x220/0x220 [ 327.117101][ C1] __br_forward+0x439/0x720 [ 327.121587][ C1] br_flood+0x52e/0x840 [ 327.126012][ C1] br_dev_xmit+0xcb6/0x1100 [ 327.130493][ C1] dev_hard_start_xmit+0x1c1/0x3f0 [ 327.135617][ C1] __dev_queue_xmit+0x1e86/0x3020 [ 327.140891][ C1] dev_queue_xmit+0x17/0x20 [ 327.145389][ C1] neigh_resolve_output+0x60c/0x6b0 [ 327.150564][ C1] ip6_finish_output2+0x102c/0x13d0 [ 327.155737][ C1] __ip6_finish_output+0x693/0x910 [ 327.160823][ C1] ip6_finish_output+0x52/0x1e0 [ 327.165644][ C1] ? ip6_output+0x25a/0x390 [ 327.170121][ C1] ip6_output+0x26f/0x390 [ 327.174455][ C1] ndisc_send_skb+0xa35/0xe40 [ 327.179112][ C1] ndisc_send_ns+0x5ce/0x7b0 [ 327.183678][ C1] addrconf_dad_work+0xe40/0x1c20 [ 327.188679][ C1] process_one_work+0x7ef/0x10e0 [ 327.193595][ C1] worker_thread+0xc01/0x1630 [ 327.198265][ C1] kthread+0x332/0x350 [ 327.202333][ C1] ? rcu_lock_release+0x30/0x30 [ 327.207158][ C1] ? kthread_blkcg+0xe0/0xe0 [ 327.211737][ C1] ret_from_fork+0x24/0x30