[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.364808][ T26] audit: type=1800 audit(1568494012.940:25): pid=8719 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.406665][ T26] audit: type=1800 audit(1568494012.950:26): pid=8719 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.440390][ T26] audit: type=1800 audit(1568494012.950:27): pid=8719 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[ 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 '10.128.0.197' (ECDSA) to the list of known hosts. syzkaller login: [ 209.765047][ T8875] IPVS: ftp: loaded support on port[0] = 21 [ 209.833750][ T8875] chnl_net:caif_netlink_parms(): no params data found [ 209.862176][ T8875] bridge0: port 1(bridge_slave_0) entered blocking state [ 209.870012][ T8875] bridge0: port 1(bridge_slave_0) entered disabled state [ 209.877964][ T8875] device bridge_slave_0 entered promiscuous mode [ 209.886080][ T8875] bridge0: port 2(bridge_slave_1) entered blocking state [ 209.893282][ T8875] bridge0: port 2(bridge_slave_1) entered disabled state [ 209.900986][ T8875] device bridge_slave_1 entered promiscuous mode [ 209.918428][ T8875] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 209.929121][ T8875] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 209.948076][ T8875] team0: Port device team_slave_0 added [ 209.955369][ T8875] team0: Port device team_slave_1 added [ 210.009823][ T8875] device hsr_slave_0 entered promiscuous mode [ 210.077310][ T8875] device hsr_slave_1 entered promiscuous mode [ 210.134734][ T8875] bridge0: port 2(bridge_slave_1) entered blocking state [ 210.142962][ T8875] bridge0: port 2(bridge_slave_1) entered forwarding state [ 210.150973][ T8875] bridge0: port 1(bridge_slave_0) entered blocking state [ 210.158225][ T8875] bridge0: port 1(bridge_slave_0) entered forwarding state [ 210.193144][ T8875] 8021q: adding VLAN 0 to HW filter on device bond0 [ 210.206108][ T3578] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 210.217865][ T3578] bridge0: port 1(bridge_slave_0) entered disabled state [ 210.238096][ T3578] bridge0: port 2(bridge_slave_1) entered disabled state [ 210.247015][ T3578] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 210.259244][ T8875] 8021q: adding VLAN 0 to HW filter on device team0 [ 210.269630][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 210.278810][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 210.286052][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 210.308867][ T8878] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 210.319589][ T8878] bridge0: port 2(bridge_slave_1) entered blocking state [ 210.326929][ T8878] bridge0: port 2(bridge_slave_1) entered forwarding state [ 210.335384][ T8878] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 210.345573][ T8878] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 210.354941][ T8878] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 210.366350][ T8879] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 210.374269][ T8879] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 210.384788][ T8875] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 210.403365][ T8875] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 315.636542][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 315.644656][ C0] rcu: 0-...!: (1 GPs behind) idle=04a/1/0x4000000000000002 softirq=10191/10192 fqs=4 [ 315.654684][ C0] (t=10501 jiffies g=7725 q=37) [ 315.659616][ C0] rcu: rcu_preempt kthread starved for 10494 jiffies! g7725 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 315.670872][ C0] rcu: RCU grace-period kthread stack dump: [ 315.676746][ C0] rcu_preempt R running task 29440 10 2 0x80004000 [ 315.684630][ C0] Call Trace: [ 315.688046][ C0] __schedule+0x755/0x1580 [ 315.692450][ C0] ? __sched_text_start+0x8/0x8 [ 315.697294][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 315.703086][ C0] ? schedule_timeout+0x47c/0xc50 [ 315.708253][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 315.713526][ C0] schedule+0xd9/0x260 [ 315.718452][ C0] schedule_timeout+0x486/0xc50 [ 315.723285][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 315.729164][ C0] ? usleep_range+0x170/0x170 [ 315.733893][ C0] ? trace_hardirqs_on+0x67/0x240 [ 315.738951][ C0] ? __kasan_check_read+0x11/0x20 [ 315.744001][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 315.749559][ C0] ? swake_up_one+0x60/0x60 [ 315.754075][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 315.758831][ C0] ? rcu_barrier+0x310/0x310 [ 315.763408][ C0] ? trace_hardirqs_on+0x67/0x240 [ 315.768424][ C0] ? __kasan_check_read+0x11/0x20 [ 315.773502][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 315.779753][ C0] ? __kthread_parkme+0x108/0x1c0 [ 315.784761][ C0] ? __kasan_check_read+0x11/0x20 [ 315.789768][ C0] kthread+0x361/0x430 [ 315.793824][ C0] ? rcu_barrier+0x310/0x310 [ 315.798577][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 315.804823][ C0] ret_from_fork+0x24/0x30 [ 315.809315][ C0] NMI backtrace for cpu 0 [ 315.813675][ C0] CPU: 0 PID: 3014 Comm: kworker/0:2 Not tainted 5.3.0-rc7+ #0 [ 315.821205][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 315.832396][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 315.838358][ C0] Call Trace: [ 315.841626][ C0] [ 315.844499][ C0] dump_stack+0x172/0x1f0 [ 315.848816][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 315.854100][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 315.860397][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 315.866017][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 315.871985][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 315.877876][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 315.883846][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 315.889422][ C0] ? raise_softirq+0x138/0x340 [ 315.894177][ C0] update_process_times+0x32/0x80 [ 315.899212][ C0] tick_sched_handle+0xa2/0x190 [ 315.904054][ C0] tick_sched_timer+0x53/0x140 [ 315.908819][ C0] __hrtimer_run_queues+0x364/0xe40 [ 315.914005][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 315.919290][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 315.924830][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 315.930531][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 315.936586][ C0] hrtimer_interrupt+0x314/0x770 [ 315.941572][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 315.947101][ C0] apic_timer_interrupt+0xf/0x20 [ 315.952019][ C0] [ 315.954948][ C0] RIP: 0010:write_comp_data+0x1e/0x70 [ 315.960325][ C0] Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 58 88 8f 7e a9 00 01 1f 00 75 51 41 8b 80 f0 12 00 00 <83> f8 03 75 45 49 8b 80 f8 12 00 00 45 8b 80 f4 12 00 00 4c 8b 08 [ 315.979914][ C0] RSP: 0018:ffff88809f93f3e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 315.988312][ C0] RAX: 0000000000000000 RBX: ffff8880956bb4f8 RCX: ffffffff85c7df19 [ 315.996264][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 316.004217][ C0] RBP: ffff88809f93f3e8 R08: ffff88809f90a700 R09: fffffbfff14e9755 [ 316.012171][ C0] R10: ffff88809f90b0a8 R11: ffff88809f90a700 R12: dffffc0000000000 [ 316.020128][ C0] R13: ffff8880956bb200 R14: ffff8880956bb590 R15: 0000000000000000 [ 316.028167][ C0] ? hhf_dequeue+0xb9/0xa20 [ 316.032667][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 316.038890][ C0] hhf_dequeue+0xb9/0xa20 [ 316.043247][ C0] __qdisc_run+0x1e7/0x19d0 [ 316.047801][ C0] ? dev_queue_xmit+0x18/0x20 [ 316.052469][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 316.057492][ C0] ? __kasan_check_read+0x11/0x20 [ 316.062519][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 316.067802][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 316.073505][ C0] ? __kasan_check_read+0x11/0x20 [ 316.078522][ C0] ? mark_held_locks+0xa4/0xf0 [ 316.083276][ C0] dev_queue_xmit+0x18/0x20 [ 316.087760][ C0] ? dev_queue_xmit+0x18/0x20 [ 316.092482][ C0] neigh_resolve_output+0x5a5/0x970 [ 316.097682][ C0] ip6_finish_output2+0x1034/0x2520 [ 316.102917][ C0] ? ip6_forward_finish+0x530/0x530 [ 316.108124][ C0] ? lock_downgrade+0x920/0x920 [ 316.114717][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 316.120963][ C0] ? __kasan_check_read+0x11/0x20 [ 316.125990][ C0] __ip6_finish_output+0x444/0xa50 [ 316.131189][ C0] ? __ip6_finish_output+0x444/0xa50 [ 316.136487][ C0] ip6_finish_output+0x38/0x1f0 [ 316.141327][ C0] ip6_output+0x235/0x7c0 [ 316.145899][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 316.150996][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 316.156334][ C0] ndisc_send_skb+0xf29/0x1450 [ 316.161104][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 316.166418][ C0] ? skb_set_owner_w+0x21b/0x320 [ 316.171431][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 316.177488][ C0] ndisc_send_ns+0x3a9/0x850 [ 316.182066][ C0] ? mark_held_locks+0xa4/0xf0 [ 316.186815][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 316.192000][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 316.197270][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 316.202447][ C0] ? trace_hardirqs_on+0x67/0x240 [ 316.207453][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 316.212640][ C0] addrconf_dad_work+0xb88/0x1150 [ 316.217650][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 316.223233][ C0] process_one_work+0x9af/0x1740 [ 316.228179][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 316.233531][ C0] ? lock_acquire+0x190/0x410 [ 316.238216][ C0] worker_thread+0x98/0xe40 [ 316.242701][ C0] ? trace_hardirqs_on+0x67/0x240 [ 316.247717][ C0] kthread+0x361/0x430 [ 316.251768][ C0] ? process_one_work+0x1740/0x1740 [ 316.256957][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 316.263201][ C0] ret_from_fork+0x24/0x30