[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 55.241377][ T26] audit: type=1800 audit(1568251272.578:25): pid=8516 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 55.280780][ T26] audit: type=1800 audit(1568251272.578:26): pid=8516 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 55.326036][ T26] audit: type=1800 audit(1568251272.578:27): pid=8516 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts.
syzkaller login: [ 298.845613][ T8669] IPVS: ftp: loaded support on port[0] = 21
[ 298.906643][ T8669] chnl_net:caif_netlink_parms(): no params data found
[ 298.935497][ T8669] bridge0: port 1(bridge_slave_0) entered blocking state
[ 298.943454][ T8669] bridge0: port 1(bridge_slave_0) entered disabled state
[ 298.951928][ T8669] device bridge_slave_0 entered promiscuous mode
[ 298.960266][ T8669] bridge0: port 2(bridge_slave_1) entered blocking state
[ 298.967598][ T8669] bridge0: port 2(bridge_slave_1) entered disabled state
[ 298.975312][ T8669] device bridge_slave_1 entered promiscuous mode
[ 298.991215][ T8669] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 299.002134][ T8669] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 299.019740][ T8669] team0: Port device team_slave_0 added
[ 299.027386][ T8669] team0: Port device team_slave_1 added
[ 299.103023][ T8669] device hsr_slave_0 entered promiscuous mode
[ 299.141071][ T8669] device hsr_slave_1 entered promiscuous mode
[ 299.188243][ T8669] bridge0: port 2(bridge_slave_1) entered blocking state
[ 299.195430][ T8669] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 299.203474][ T8669] bridge0: port 1(bridge_slave_0) entered blocking state
[ 299.210529][ T8669] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 299.244433][ T8669] 8021q: adding VLAN 0 to HW filter on device bond0
[ 299.255717][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 299.275971][ T17] bridge0: port 1(bridge_slave_0) entered disabled state
[ 299.285386][ T17] bridge0: port 2(bridge_slave_1) entered disabled state
[ 299.295068][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[ 299.306186][ T8669] 8021q: adding VLAN 0 to HW filter on device team0
[ 299.316554][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 299.325239][ T12] bridge0: port 1(bridge_slave_0) entered blocking state
[ 299.332753][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 299.343080][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 299.351892][ T17] bridge0: port 2(bridge_slave_1) entered blocking state
[ 299.359275][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 299.379892][ T8669] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[ 299.391046][ T8669] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[ 299.405143][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 299.414376][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 299.423210][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 299.432047][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
executing program
[ 299.440412][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[ 299.448092][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 299.466074][ T8669] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 404.530630][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU
[ 404.537873][ C1] rcu: 1-...!: (1 GPs behind) idle=a96/1/0x4000000000000002 softirq=9381/9382 fqs=28
[ 404.547788][ C1] (t=10500 jiffies g=7241 q=53)
[ 404.552867][ C1] rcu: rcu_preempt kthread starved for 10444 jiffies! g7241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
[ 404.564292][ C1] rcu: RCU grace-period kthread stack dump:
[ 404.570186][ C1] rcu_preempt R running task 29112 10 2 0x80004000
[ 404.578297][ C1] Call Trace:
[ 404.581678][ C1] __schedule+0x755/0x1580
[ 404.586831][ C1] ? __sched_text_start+0x8/0x8
[ 404.591679][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0
[ 404.597532][ C1] ? schedule_timeout+0x47c/0xc50
[ 404.602557][ C1] ? lockdep_hardirqs_on+0x418/0x5d0
[ 404.607969][ C1] schedule+0xd9/0x260
[ 404.612038][ C1] schedule_timeout+0x486/0xc50
[ 404.616886][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0
[ 404.622698][ C1] ? usleep_range+0x170/0x170
[ 404.627644][ C1] ? trace_hardirqs_on+0x67/0x240
[ 404.633870][ C1] ? __kasan_check_read+0x11/0x20
[ 404.638993][ C1] ? __next_timer_interrupt+0x1a0/0x1a0
[ 404.644732][ C1] ? swake_up_one+0x60/0x60
[ 404.649561][ C1] rcu_gp_kthread+0x9b2/0x18c0
[ 404.654544][ C1] ? rcu_barrier+0x310/0x310
[ 404.659307][ C1] ? trace_hardirqs_on+0x67/0x240
[ 404.664464][ C1] ? __kasan_check_read+0x11/0x20
[ 404.669561][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[ 404.675979][ C1] ? __kthread_parkme+0x108/0x1c0
[ 404.681264][ C1] ? __kasan_check_read+0x11/0x20
[ 404.686467][ C1] kthread+0x361/0x430
[ 404.690629][ C1] ? rcu_barrier+0x310/0x310
[ 404.695369][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20
[ 404.701704][ C1] ret_from_fork+0x24/0x30
[ 404.706132][ C1] NMI backtrace for cpu 1
[ 404.710550][ C1] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.3.0-rc7+ #0
[ 404.718128][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 404.728507][ C1] Workqueue: ipv6_addrconf addrconf_dad_work
[ 404.734788][ C1] Call Trace:
[ 404.738397][ C1]
[ 404.741312][ C1] dump_stack+0x172/0x1f0
[ 404.745653][ C1] nmi_cpu_backtrace.cold+0x70/0xb2
[ 404.751027][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 404.757287][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45
[ 404.763017][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b
[ 404.769313][ C1] arch_trigger_cpumask_backtrace+0x14/0x20
[ 404.775215][ C1] rcu_dump_cpu_stacks+0x183/0x1cf
[ 404.780476][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13
[ 404.786343][ C1] ? raise_softirq+0x138/0x340
[ 404.791302][ C1] update_process_times+0x32/0x80
[ 404.796478][ C1] tick_sched_handle+0xa2/0x190
[ 404.801333][ C1] tick_sched_timer+0x53/0x140
[ 404.806145][ C1] __hrtimer_run_queues+0x364/0xe40
[ 404.811554][ C1] ? tick_sched_do_timer+0x1b0/0x1b0
[ 404.816936][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0
[ 404.822705][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20
[ 404.828430][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440
[ 404.834589][ C1] hrtimer_interrupt+0x314/0x770
[ 404.839636][ C1] smp_apic_timer_interrupt+0x160/0x610
[ 404.845200][ C1] apic_timer_interrupt+0xf/0x20
[ 404.850137][ C1]
[ 404.853232][ C1] RIP: 0010:hhf_dequeue+0x532/0xa20
[ 404.858519][ C1] Code: 45 b8 4c 8b 75 c8 42 80 3c 20 00 0f 85 3a 04 00 00 49 8b 85 90 03 00 00 48 39 45 c8 0f 85 4b fb ff ff 45 31 ff e9 b0 02 00 00 19 95 aa fb 48 8d 43 f0 41 be 01 00 00 00 49 8d 95 c0 02 00 00
[ 404.878471][ C1] RSP: 0018:ffff8880a991f3f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[ 404.887007][ C1] RAX: 0000000000000000 RBX: ffff8880a10aa338 RCX: ffffffff85c7dbb9
[ 404.894986][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
[ 404.903168][ C1] RBP: ffff8880a991f448 R08: ffff8880a9910480 R09: fffffbfff14e9555
[ 404.911136][ C1] R10: ffff8880a9910e28 R11: ffff8880a9910480 R12: dffffc0000000000
[ 404.919357][ C1] R13: ffff8880a10aa040 R14: ffff8880a10aa3d0 R15: 0000000000000000
[ 404.927569][ C1] ? hhf_dequeue+0xb9/0xa20
[ 404.932429][ C1] ? hhf_dequeue+0xb9/0xa20
[ 404.937016][ C1] __qdisc_run+0x1e7/0x19d0
[ 404.941755][ C1] ? dev_queue_xmit+0x18/0x20
[ 404.946552][ C1] __dev_queue_xmit+0x16f1/0x3650
[ 404.951990][ C1] ? __kasan_check_read+0x11/0x20
[ 404.957192][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0
[ 404.962910][ C1] ? ip6_finish_output2+0x1034/0x2520
[ 404.968429][ C1] ? __kasan_check_read+0x11/0x20
[ 404.973649][ C1] ? mark_held_locks+0xa4/0xf0
[ 404.978420][ C1] dev_queue_xmit+0x18/0x20
[ 404.982932][ C1] ? dev_queue_xmit+0x18/0x20
[ 404.987990][ C1] neigh_resolve_output+0x5a5/0x970
[ 404.993452][ C1] ip6_finish_output2+0x1034/0x2520
[ 404.998830][ C1] ? ip6_forward_finish+0x530/0x530
[ 405.004345][ C1] ? lock_downgrade+0x920/0x920
[ 405.009193][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 405.015528][ C1] ? __kasan_check_read+0x11/0x20
[ 405.020862][ C1] __ip6_finish_output+0x444/0xa50
[ 405.026057][ C1] ? __ip6_finish_output+0x444/0xa50
[ 405.031576][ C1] ip6_finish_output+0x38/0x1f0
[ 405.036559][ C1] ip6_output+0x235/0x7c0
[ 405.040988][ C1] ? ip6_finish_output+0x1f0/0x1f0
[ 405.046302][ C1] ? __ip6_finish_output+0xa50/0xa50
[ 405.051650][ C1] ndisc_send_skb+0xf29/0x1450
[ 405.056420][ C1] ? nf_hook.constprop.0+0x560/0x560
[ 405.061804][ C1] ? skb_set_owner_w+0x21b/0x320
[ 405.066899][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20
[ 405.072928][ C1] ndisc_send_ns+0x3a9/0x850
[ 405.077575][ C1] ? mark_held_locks+0xa4/0xf0
[ 405.082665][ C1] ? ndisc_netdev_event+0x4e0/0x4e0
[ 405.087870][ C1] ? lockdep_hardirqs_on+0x418/0x5d0
[ 405.093168][ C1] ? addrconf_dad_work+0xac4/0x1150
[ 405.098454][ C1] ? trace_hardirqs_on+0x67/0x240
[ 405.103476][ C1] ? addrconf_dad_work+0xac4/0x1150
[ 405.108779][ C1] addrconf_dad_work+0xb88/0x1150
[ 405.113905][ C1] ? addrconf_dad_completed+0xbb0/0xbb0
[ 405.119547][ C1] process_one_work+0x9af/0x1740
[ 405.124591][ C1] ? pwq_dec_nr_in_flight+0x320/0x320
[ 405.130119][ C1] ? lock_acquire+0x190/0x410
[ 405.135216][ C1] worker_thread+0x98/0xe40
[ 405.139834][ C1] kthread+0x361/0x430
[ 405.143988][ C1] ? process_one_work+0x1740/0x1740
[ 405.149501][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20
[ 405.156133][ C1] ret_from_fork+0x24/0x30