[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 67.309338][ T9871] sshd (9871) used greatest stack depth: 23704 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 67.517705][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 67.517715][ T26] audit: type=1800 audit(1568377840.743:29): pid=9805 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 [ 67.545019][ T26] audit: type=1800 audit(1568377840.743:30): pid=9805 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 '10.128.1.11' (ECDSA) to the list of known hosts. syzkaller login: [ 76.966169][ T9959] IPVS: ftp: loaded support on port[0] = 21 [ 77.020157][ T9959] chnl_net:caif_netlink_parms(): no params data found [ 77.042400][ T9959] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.050158][ T9959] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.057890][ T9959] device bridge_slave_0 entered promiscuous mode [ 77.065325][ T9959] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.072561][ T9959] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.082269][ T9959] device bridge_slave_1 entered promiscuous mode [ 77.096682][ T9959] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 77.107990][ T9959] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 77.124059][ T9959] team0: Port device team_slave_0 added [ 77.130975][ T9959] team0: Port device team_slave_1 added [ 77.214362][ T9959] device hsr_slave_0 entered promiscuous mode [ 77.263131][ T9959] device hsr_slave_1 entered promiscuous mode [ 77.318120][ T9959] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.325467][ T9959] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.332942][ T9959] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.340257][ T9959] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.365294][ T9959] 8021q: adding VLAN 0 to HW filter on device bond0 [ 77.376117][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 77.388797][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.396678][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.404409][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 77.414583][ T9959] 8021q: adding VLAN 0 to HW filter on device team0 [ 77.423417][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 77.432013][ T3014] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.439121][ T3014] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.448819][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 77.457804][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.465180][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.478973][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 77.487474][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 77.497199][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 77.508399][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 77.518772][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 77.528619][ T9959] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 77.543915][ T9959] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 182.592719][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 182.599386][ C0] rcu: 0-...!: (1 GPs behind) idle=9c6/1/0x4000000000000002 softirq=8936/8943 fqs=35 [ 182.609002][ C0] (t=10500 jiffies g=9297 q=73) [ 182.613924][ C0] rcu: rcu_preempt kthread starved for 10430 jiffies! g9297 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 182.625170][ C0] rcu: RCU grace-period kthread stack dump: [ 182.631043][ C0] rcu_preempt I29448 10 2 0x80004000 [ 182.637375][ C0] Call Trace: [ 182.640675][ C0] __schedule+0x755/0x1580 [ 182.645089][ C0] ? __sched_text_start+0x8/0x8 [ 182.649938][ C0] schedule+0xd9/0x260 [ 182.654076][ C0] schedule_timeout+0x486/0xc50 [ 182.658909][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 182.663849][ C0] ? usleep_range+0x170/0x170 [ 182.668506][ C0] ? trace_hardirqs_on+0x67/0x240 [ 182.673511][ C0] ? __kasan_check_read+0x11/0x20 [ 182.678520][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 182.684064][ C0] ? swake_up_one+0x60/0x60 [ 182.688564][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 182.693396][ C0] ? rcu_barrier+0x310/0x310 [ 182.697984][ C0] ? trace_hardirqs_on+0x67/0x240 [ 182.703010][ C0] ? __kasan_check_read+0x11/0x20 [ 182.708112][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 182.714332][ C0] ? __kthread_parkme+0x108/0x1c0 [ 182.719358][ C0] ? __kasan_check_read+0x11/0x20 [ 182.724371][ C0] kthread+0x361/0x430 [ 182.728421][ C0] ? rcu_barrier+0x310/0x310 [ 182.733079][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 182.739393][ C0] ret_from_fork+0x24/0x30 [ 182.743822][ C0] NMI backtrace for cpu 0 [ 182.748138][ C0] CPU: 0 PID: 3014 Comm: kworker/0:2 Not tainted 5.3.0-rc8+ #0 [ 182.755660][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 182.765813][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 182.771790][ C0] Call Trace: [ 182.775060][ C0] [ 182.777899][ C0] dump_stack+0x172/0x1f0 [ 182.782225][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 182.787410][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 182.793637][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 182.799253][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 182.805231][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 182.811191][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 182.816286][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 182.821815][ C0] ? raise_softirq+0x138/0x340 [ 182.826564][ C0] update_process_times+0x32/0x80 [ 182.831571][ C0] tick_sched_handle+0xa2/0x190 [ 182.836408][ C0] tick_sched_timer+0x53/0x140 [ 182.841164][ C0] __hrtimer_run_queues+0x364/0xe40 [ 182.846381][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 182.851658][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 182.857257][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 182.862962][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 182.869471][ C0] hrtimer_interrupt+0x314/0x770 [ 182.874402][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 182.879931][ C0] apic_timer_interrupt+0xf/0x20 [ 182.884852][ C0] [ 182.887792][ C0] RIP: 0010:write_comp_data+0x0/0x70 [ 182.893095][ C0] Code: 83 fa 02 75 20 48 8b 88 f8 12 00 00 8b 80 f4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 <65> 4c 8b 04 25 40 fe 01 00 65 8b 05 78 88 8f 7e a9 00 01 1f 00 75 [ 182.912797][ C0] RSP: 0018:ffff88809fa2ed40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 182.921363][ C0] RAX: 0000000000000001 RBX: ffff88808ad8c7b8 RCX: ffffffff85c66051 [ 182.929421][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 182.937389][ C0] RBP: ffff88809fa2ed48 R08: ffff88809f9c4700 R09: 0000000000000000 [ 182.945343][ C0] R10: fffffbfff134afaf R11: ffff88809f9c4700 R12: dffffc0000000000 [ 182.953478][ C0] R13: ffff88808ad8c4c0 R14: 0000000000000001 R15: 0000000000000000 [ 182.961592][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 182.966178][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 182.972411][ C0] hhf_dequeue+0x5d1/0xa20 [ 182.976824][ C0] __qdisc_run+0x1e7/0x19d0 [ 182.981307][ C0] ? dev_queue_xmit+0x18/0x20 [ 182.985991][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 182.991109][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 182.996657][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 183.001929][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 183.008162][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 183.013895][ C0] ? br_forward_finish+0x235/0x400 [ 183.019008][ C0] ? __kasan_check_read+0x11/0x20 [ 183.024044][ C0] ? __dev_queue_xmit+0x2b15/0x3650 [ 183.029241][ C0] dev_queue_xmit+0x18/0x20 [ 183.033728][ C0] ? dev_queue_xmit+0x18/0x20 [ 183.038483][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 183.043844][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 183.048421][ C0] br_forward_finish+0xfa/0x400 [ 183.053274][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 183.058823][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 183.063577][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 183.069280][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 183.074293][ C0] __br_forward+0x641/0xb00 [ 183.078792][ C0] ? br_forward_finish+0x400/0x400 [ 183.083893][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 183.089421][ C0] deliver_clone+0x61/0xc0 [ 183.093817][ C0] maybe_deliver+0x2c7/0x390 [ 183.098385][ C0] br_flood+0x13a/0x3d0 [ 183.102528][ C0] br_dev_xmit+0x98c/0x15a0 [ 183.107547][ C0] ? br_poll_controller+0x10/0x10 [ 183.112569][ C0] ? netif_skb_features+0x6c2/0xb90 [ 183.117757][ C0] ? netdev_set_sb_channel+0xe0/0xe0 [ 183.123040][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 183.129374][ C0] ? validate_xmit_xfrm+0x43c/0xf10 [ 183.134564][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 183.139490][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 183.145749][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 183.150842][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 183.157072][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 183.162079][ C0] ? ndisc_constructor+0x1a5/0xb40 [ 183.167464][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 183.173142][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 183.178698][ C0] ? __kasan_check_read+0x11/0x20 [ 183.183726][ C0] ? lock_downgrade+0x920/0x920 [ 183.188582][ C0] dev_queue_xmit+0x18/0x20 [ 183.193687][ C0] ? dev_queue_xmit+0x18/0x20 [ 183.198434][ C0] neigh_resolve_output+0x5a5/0x970 [ 183.203701][ C0] ip6_finish_output2+0x1034/0x2520 [ 183.208901][ C0] ? ip6_forward_finish+0x530/0x530 [ 183.214091][ C0] ? lock_downgrade+0x920/0x920 [ 183.218922][ C0] ? ip6_mtu+0x16f/0x460 [ 183.223157][ C0] __ip6_finish_output+0x444/0xa50 [ 183.228332][ C0] ? __ip6_finish_output+0x444/0xa50 [ 183.233612][ C0] ip6_finish_output+0x38/0x1f0 [ 183.238440][ C0] ip6_output+0x235/0x7c0 [ 183.242755][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 183.247844][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 183.253116][ C0] ? ndisc_send_skb+0x803/0x1450 [ 183.258034][ C0] ndisc_send_skb+0xf29/0x1450 [ 183.262795][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 183.268063][ C0] ? skb_set_owner_w+0x21b/0x320 [ 183.273509][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 183.279209][ C0] ndisc_send_ns+0x3a9/0x850 [ 183.283779][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 183.290000][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 183.295178][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 183.300806][ C0] ? trace_hardirqs_on+0x67/0x240 [ 183.306429][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 183.311630][ C0] addrconf_dad_work+0xb88/0x1150 [ 183.316641][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 183.322170][ C0] ? lock_acquire+0x190/0x410 [ 183.326921][ C0] ? trace_hardirqs_on+0x67/0x240 [ 183.331930][ C0] process_one_work+0x9af/0x1740 [ 183.336874][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 183.342243][ C0] ? lock_acquire+0x190/0x410 [ 183.346904][ C0] worker_thread+0x98/0xe40 [ 183.351399][ C0] ? trace_hardirqs_on+0x67/0x240 [ 183.356408][ C0] kthread+0x361/0x430 [ 183.361199][ C0] ? process_one_work+0x1740/0x1740 [ 183.366380][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 183.372603][ C0] ret_from_fork+0x24/0x30