[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.931161][ T26] audit: type=1800 audit(1568570041.274:25): pid=8671 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.962332][ T26] audit: type=1800 audit(1568570041.284:26): pid=8671 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.983772][ T26] audit: type=1800 audit(1568570041.284:27): pid=8671 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 '10.128.0.97' (ECDSA) to the list of known hosts. syzkaller login: [ 66.770543][ T8824] IPVS: ftp: loaded support on port[0] = 21 [ 66.828515][ T8824] chnl_net:caif_netlink_parms(): no params data found [ 66.857288][ T8824] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.865414][ T8824] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.873341][ T8824] device bridge_slave_0 entered promiscuous mode [ 66.881333][ T8824] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.888514][ T8824] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.896208][ T8824] device bridge_slave_1 entered promiscuous mode [ 66.913691][ T8824] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 66.923986][ T8824] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 66.942025][ T8824] team0: Port device team_slave_0 added [ 66.950828][ T8824] team0: Port device team_slave_1 added [ 67.024760][ T8824] device hsr_slave_0 entered promiscuous mode [ 67.092562][ T8824] device hsr_slave_1 entered promiscuous mode [ 67.171294][ T8824] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.178540][ T8824] bridge0: port 2(bridge_slave_1) entered forwarding state [ 67.186401][ T8824] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.193511][ T8824] bridge0: port 1(bridge_slave_0) entered forwarding state [ 67.226027][ T8824] 8021q: adding VLAN 0 to HW filter on device bond0 [ 67.237527][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 67.248153][ T2824] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.257082][ T2824] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.265034][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 67.277272][ T8824] 8021q: adding VLAN 0 to HW filter on device team0 [ 67.287511][ T8826] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 67.296314][ T8826] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.303382][ T8826] bridge0: port 1(bridge_slave_0) entered forwarding state [ 67.315004][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 67.325674][ T2824] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.332765][ T2824] bridge0: port 2(bridge_slave_1) entered forwarding state [ 67.353196][ T8826] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 67.361722][ T8826] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 67.373143][ T8829] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 67.380888][ T8829] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 67.392498][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 67.402135][ T8824] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 67.421260][ T8824] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 172.462191][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 172.468940][ C1] rcu: 1-...!: (10499 ticks this GP) idle=ffa/1/0x4000000000000002 softirq=9252/9252 fqs=37 [ 172.479305][ C1] (t=10501 jiffies g=6829 q=64) [ 172.484237][ C1] rcu: rcu_preempt kthread starved for 10428 jiffies! g6829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 172.495487][ C1] rcu: RCU grace-period kthread stack dump: [ 172.501358][ C1] rcu_preempt I29440 10 2 0x80004000 [ 172.507675][ C1] Call Trace: [ 172.510967][ C1] __schedule+0x755/0x1580 [ 172.515372][ C1] ? __sched_text_start+0x8/0x8 [ 172.520203][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 172.525992][ C1] ? schedule_timeout+0x47c/0xc50 [ 172.530998][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 172.536267][ C1] schedule+0xd9/0x260 [ 172.540321][ C1] schedule_timeout+0x486/0xc50 [ 172.545152][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 172.550942][ C1] ? usleep_range+0x170/0x170 [ 172.555597][ C1] ? trace_hardirqs_on+0x67/0x240 [ 172.560602][ C1] ? __kasan_check_read+0x11/0x20 [ 172.565607][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 172.571134][ C1] ? swake_up_one+0x60/0x60 [ 172.575625][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 172.580383][ C1] ? rcu_barrier+0x310/0x310 [ 172.584951][ C1] ? trace_hardirqs_on+0x67/0x240 [ 172.589959][ C1] ? __kasan_check_read+0x11/0x20 [ 172.594983][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 172.601204][ C1] ? __kthread_parkme+0x108/0x1c0 [ 172.606214][ C1] ? __kasan_check_read+0x11/0x20 [ 172.611220][ C1] kthread+0x361/0x430 [ 172.615271][ C1] ? rcu_barrier+0x310/0x310 [ 172.619841][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 172.626060][ C1] ret_from_fork+0x24/0x30 [ 172.631108][ C1] NMI backtrace for cpu 1 [ 172.635424][ C1] CPU: 1 PID: 8829 Comm: kworker/1:3 Not tainted 5.3.0-rc7+ #0 [ 172.642940][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 172.652991][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 172.658945][ C1] Call Trace: [ 172.662215][ C1] [ 172.665049][ C1] dump_stack+0x172/0x1f0 [ 172.669371][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 172.674645][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 172.680870][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 172.686482][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 172.692446][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 172.698332][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 172.703438][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 172.708965][ C1] ? raise_softirq+0x138/0x340 [ 172.713719][ C1] update_process_times+0x32/0x80 [ 172.718724][ C1] tick_sched_handle+0xa2/0x190 [ 172.723567][ C1] tick_sched_timer+0x53/0x140 [ 172.728315][ C1] __hrtimer_run_queues+0x364/0xe40 [ 172.733497][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 172.738767][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 172.744304][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 172.750011][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 172.756064][ C1] hrtimer_interrupt+0x314/0x770 [ 172.760999][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 172.766528][ C1] apic_timer_interrupt+0xf/0x20 [ 172.771450][ C1] [ 172.774372][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 172.780421][ C1] Code: 89 25 d4 8c 39 09 41 bc f4 ff ff ff e8 6d 9f e9 ff 48 c7 05 be 8c 39 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 a4 88 8f 7e 81 e2 [ 172.800023][ C1] RSP: 0018:ffff88808d4aed50 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 172.808436][ C1] RAX: 0000000000000000 RBX: ffff8880a6513df8 RCX: ffffffff85c7e431 [ 172.816390][ C1] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 172.824343][ C1] RBP: ffff88808d4aeda8 R08: ffff8880937a8580 R09: fffffbfff14e9755 [ 172.832295][ C1] R10: ffff8880937a8f78 R11: ffff8880937a8580 R12: dffffc0000000000 [ 172.840247][ C1] R13: ffff8880a6513b00 R14: 0000000000000001 R15: 0000000000000000 [ 172.848219][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 172.852796][ C1] ? hhf_dequeue+0x5db/0xa20 [ 172.857380][ C1] __qdisc_run+0x1e7/0x19d0 [ 172.861865][ C1] ? dev_queue_xmit+0x18/0x20 [ 172.866530][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 172.871630][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 172.876999][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 172.882359][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 172.888600][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 172.893866][ C1] ? br_forward_finish+0x235/0x400 [ 172.898987][ C1] ? find_held_lock+0x35/0x130 [ 172.903741][ C1] ? br_forward_finish+0x235/0x400 [ 172.908840][ C1] dev_queue_xmit+0x18/0x20 [ 172.913336][ C1] ? dev_queue_xmit+0x18/0x20 [ 172.917995][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 172.923348][ C1] ? __kasan_check_read+0x11/0x20 [ 172.928363][ C1] br_forward_finish+0xfa/0x400 [ 172.933204][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 172.938734][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 172.943487][ C1] ? __kasan_check_read+0x11/0x20 [ 172.948496][ C1] __br_forward+0x641/0xb00 [ 172.952982][ C1] ? br_forward_finish+0x400/0x400 [ 172.958077][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 172.963632][ C1] deliver_clone+0x61/0xc0 [ 172.968043][ C1] maybe_deliver+0x2c7/0x390 [ 172.972622][ C1] br_flood+0x13a/0x3d0 [ 172.976771][ C1] br_dev_xmit+0x98c/0x15a0 [ 172.981261][ C1] ? br_poll_controller+0x10/0x10 [ 172.986266][ C1] ? netif_skb_features+0x6c2/0xb90 [ 172.991468][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 172.997692][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 173.002790][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 173.007796][ C1] ? __kasan_check_read+0x11/0x20 [ 173.012803][ C1] ? __lock_acquire+0x1702/0x4c30 [ 173.017811][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 173.023090][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 173.028459][ C1] ? __kasan_check_read+0x11/0x20 [ 173.033476][ C1] ? mark_lock+0xc0/0x11e0 [ 173.037885][ C1] ? mark_held_locks+0xa4/0xf0 [ 173.042647][ C1] dev_queue_xmit+0x18/0x20 [ 173.047129][ C1] ? dev_queue_xmit+0x18/0x20 [ 173.051789][ C1] neigh_resolve_output+0x5a5/0x970 [ 173.056974][ C1] ip6_finish_output2+0x1034/0x2520 [ 173.062165][ C1] ? ip6_mtu+0x2e6/0x460 [ 173.066397][ C1] ? ip6_forward_finish+0x530/0x530 [ 173.071572][ C1] ? lock_downgrade+0x920/0x920 [ 173.076410][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 173.082633][ C1] ? __kasan_check_read+0x11/0x20 [ 173.087660][ C1] __ip6_finish_output+0x444/0xa50 [ 173.092756][ C1] ? __ip6_finish_output+0x444/0xa50 [ 173.098026][ C1] ip6_finish_output+0x38/0x1f0 [ 173.102858][ C1] ip6_output+0x235/0x7c0 [ 173.107170][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 173.112273][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 173.117544][ C1] ndisc_send_skb+0xf29/0x1450 [ 173.122303][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 173.127585][ C1] ? skb_set_owner_w+0x21b/0x320 [ 173.132526][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 173.138233][ C1] ndisc_send_ns+0x3a9/0x850 [ 173.142815][ C1] ? mark_held_locks+0xa4/0xf0 [ 173.147562][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 173.152741][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 173.158005][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 173.163183][ C1] ? trace_hardirqs_on+0x67/0x240 [ 173.168186][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 173.173378][ C1] addrconf_dad_work+0xb88/0x1150 [ 173.178386][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 173.183922][ C1] process_one_work+0x9af/0x1740 [ 173.188877][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 173.194226][ C1] ? lock_acquire+0x190/0x410 [ 173.198901][ C1] worker_thread+0x98/0xe40 [ 173.203384][ C1] ? trace_hardirqs_on+0x67/0x240 [ 173.208408][ C1] kthread+0x361/0x430 [ 173.212464][ C1] ? process_one_work+0x1740/0x1740 [ 173.217640][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 173.223866][ C1] ret_from_fork+0x24/0x30