[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.724058][ T26] audit: type=1800 audit(1568260745.844:25): pid=8670 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.762534][ T26] audit: type=1800 audit(1568260745.844:26): pid=8670 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.817527][ T26] audit: type=1800 audit(1568260745.854:27): pid=8670 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 '10.128.0.83' (ECDSA) to the list of known hosts. syzkaller login: [ 332.596029][ T8824] IPVS: ftp: loaded support on port[0] = 21 [ 332.659286][ T8824] chnl_net:caif_netlink_parms(): no params data found [ 332.686393][ T8824] bridge0: port 1(bridge_slave_0) entered blocking state [ 332.694860][ T8824] bridge0: port 1(bridge_slave_0) entered disabled state [ 332.703409][ T8824] device bridge_slave_0 entered promiscuous mode [ 332.711394][ T8824] bridge0: port 2(bridge_slave_1) entered blocking state [ 332.718950][ T8824] bridge0: port 2(bridge_slave_1) entered disabled state [ 332.727411][ T8824] device bridge_slave_1 entered promiscuous mode [ 332.745205][ T8824] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 332.755837][ T8824] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 332.775089][ T8824] team0: Port device team_slave_0 added [ 332.782019][ T8824] team0: Port device team_slave_1 added [ 332.835471][ T8824] device hsr_slave_0 entered promiscuous mode [ 332.872767][ T8824] device hsr_slave_1 entered promiscuous mode [ 332.920382][ T8824] bridge0: port 2(bridge_slave_1) entered blocking state [ 332.927641][ T8824] bridge0: port 2(bridge_slave_1) entered forwarding state [ 332.935530][ T8824] bridge0: port 1(bridge_slave_0) entered blocking state [ 332.942622][ T8824] bridge0: port 1(bridge_slave_0) entered forwarding state [ 332.976504][ T8824] 8021q: adding VLAN 0 to HW filter on device bond0 [ 332.989985][ T8826] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 333.011062][ T8826] bridge0: port 1(bridge_slave_0) entered disabled state [ 333.019688][ T8826] bridge0: port 2(bridge_slave_1) entered disabled state [ 333.028801][ T8826] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 333.040060][ T8824] 8021q: adding VLAN 0 to HW filter on device team0 [ 333.050743][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 333.059617][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 333.066858][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 333.083619][ T8826] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 333.093554][ T8826] bridge0: port 2(bridge_slave_1) entered blocking state [ 333.100615][ T8826] bridge0: port 2(bridge_slave_1) entered forwarding state [ 333.118192][ T8824] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 333.129843][ T8824] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 333.144756][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 333.153608][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 333.163242][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 333.171856][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 333.180600][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 333.188876][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 333.206007][ T8824] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 438.482262][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 438.489289][ C1] rcu: 1-...!: (1 GPs behind) idle=462/1/0x4000000000000002 softirq=10014/10015 fqs=20 [ 438.499225][ C1] (t=10501 jiffies g=7357 q=41) [ 438.504155][ C1] rcu: rcu_preempt kthread starved for 10462 jiffies! g7357 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 438.515407][ C1] rcu: RCU grace-period kthread stack dump: [ 438.521279][ C1] rcu_preempt I29320 10 2 0x80004000 [ 438.527620][ C1] Call Trace: [ 438.531020][ C1] __schedule+0x755/0x1580 [ 438.535625][ C1] ? __sched_text_start+0x8/0x8 [ 438.540490][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 438.546293][ C1] ? schedule_timeout+0x47c/0xc50 [ 438.551330][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 438.557603][ C1] schedule+0xd9/0x260 [ 438.561678][ C1] schedule_timeout+0x486/0xc50 [ 438.566785][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 438.572617][ C1] ? usleep_range+0x170/0x170 [ 438.577446][ C1] ? trace_hardirqs_on+0x67/0x240 [ 438.582676][ C1] ? __kasan_check_read+0x11/0x20 [ 438.587763][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 438.593307][ C1] ? swake_up_one+0x60/0x60 [ 438.597899][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 438.602673][ C1] ? rcu_barrier+0x310/0x310 [ 438.607289][ C1] ? trace_hardirqs_on+0x67/0x240 [ 438.612322][ C1] ? __kasan_check_read+0x11/0x20 [ 438.617344][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 438.623736][ C1] ? __kthread_parkme+0x108/0x1c0 [ 438.628814][ C1] ? __kasan_check_read+0x11/0x20 [ 438.633878][ C1] kthread+0x361/0x430 [ 438.637941][ C1] ? rcu_barrier+0x310/0x310 [ 438.642633][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 438.649120][ C1] ret_from_fork+0x24/0x30 [ 438.653584][ C1] NMI backtrace for cpu 1 [ 438.657904][ C1] CPU: 1 PID: 8826 Comm: kworker/1:0 Not tainted 5.3.0-rc7+ #0 [ 438.665506][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 438.675686][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 438.681662][ C1] Call Trace: [ 438.684929][ C1] [ 438.687818][ C1] dump_stack+0x172/0x1f0 [ 438.692137][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 438.697333][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 438.703563][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 438.709197][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 438.715170][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 438.721095][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 438.726456][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 438.732116][ C1] ? raise_softirq+0x138/0x340 [ 438.737073][ C1] update_process_times+0x32/0x80 [ 438.742116][ C1] tick_sched_handle+0xa2/0x190 [ 438.746979][ C1] tick_sched_timer+0x53/0x140 [ 438.751756][ C1] __hrtimer_run_queues+0x364/0xe40 [ 438.757031][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 438.762443][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 438.768013][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 438.773744][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 438.779825][ C1] hrtimer_interrupt+0x314/0x770 [ 438.784761][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 438.790296][ C1] apic_timer_interrupt+0xf/0x20 [ 438.795214][ C1] [ 438.798256][ C1] RIP: 0010:hhf_dequeue+0x66d/0xa20 [ 438.803456][ C1] Code: 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 0f 85 5b 03 00 00 4d 8b bd 98 03 00 00 48 89 df 48 8b 55 c8 4c 89 fe e8 13 70 76 fd <31> ff 89 c6 88 45 b0 e8 17 95 aa fb 0f b6 75 b0 40 84 f6 0f 84 c6 [ 438.823245][ C1] RSP: 0018:ffff8880a0e56d58 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 438.831675][ C1] RAX: 0000000000000001 RBX: ffff88808b879538 RCX: ffffffff85c7e0d1 [ 438.839738][ C1] RDX: ffff88808b8795d0 RSI: ffff88808b8795d0 RDI: ffff88808b8795d8 [ 438.847778][ C1] RBP: ffff8880a0e56da8 R08: ffff8880994e03c0 R09: fffffbfff14e9555 [ 438.855747][ C1] R10: ffff8880994e0db8 R11: ffff8880994e03c0 R12: dffffc0000000000 [ 438.863857][ C1] R13: ffff88808b879240 R14: ffff88808b8795d8 R15: ffff88808b8795d0 [ 438.871870][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 438.876483][ C1] ? hhf_dequeue+0x66d/0xa20 [ 438.881284][ C1] __qdisc_run+0x1e7/0x19d0 [ 438.885885][ C1] ? dev_queue_xmit+0x18/0x20 [ 438.890661][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 438.895687][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 438.901192][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 438.906486][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 438.912797][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 438.918130][ C1] ? br_forward_finish+0x235/0x400 [ 438.923244][ C1] ? find_held_lock+0x35/0x130 [ 438.927998][ C1] ? br_forward_finish+0x235/0x400 [ 438.933103][ C1] dev_queue_xmit+0x18/0x20 [ 438.937688][ C1] ? dev_queue_xmit+0x18/0x20 [ 438.942372][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 438.947736][ C1] ? __kasan_check_read+0x11/0x20 [ 438.952749][ C1] br_forward_finish+0xfa/0x400 [ 438.957587][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 438.963392][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 438.968243][ C1] ? __kasan_check_read+0x11/0x20 [ 438.973284][ C1] __br_forward+0x641/0xb00 [ 438.977787][ C1] ? br_forward_finish+0x400/0x400 [ 438.982890][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 438.988462][ C1] deliver_clone+0x61/0xc0 [ 438.992929][ C1] maybe_deliver+0x2c7/0x390 [ 438.997718][ C1] br_flood+0x13a/0x3d0 [ 439.001877][ C1] br_dev_xmit+0x98c/0x15a0 [ 439.006416][ C1] ? br_poll_controller+0x10/0x10 [ 439.011463][ C1] ? netif_skb_features+0x6c2/0xb90 [ 439.016693][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 439.022957][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 439.028254][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 439.033294][ C1] ? __kasan_check_read+0x11/0x20 [ 439.038306][ C1] ? __lock_acquire+0x1702/0x4c30 [ 439.043322][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 439.048687][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 439.054069][ C1] ? __kasan_check_read+0x11/0x20 [ 439.059265][ C1] ? mark_lock+0xc0/0x11e0 [ 439.063817][ C1] ? mark_held_locks+0xa4/0xf0 [ 439.068733][ C1] dev_queue_xmit+0x18/0x20 [ 439.073269][ C1] ? dev_queue_xmit+0x18/0x20 [ 439.078156][ C1] neigh_resolve_output+0x5a5/0x970 [ 439.083472][ C1] ip6_finish_output2+0x1034/0x2520 [ 439.088690][ C1] ? ip6_forward_finish+0x530/0x530 [ 439.093903][ C1] ? lock_downgrade+0x920/0x920 [ 439.098749][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 439.105142][ C1] ? __kasan_check_read+0x11/0x20 [ 439.110228][ C1] __ip6_finish_output+0x444/0xa50 [ 439.115339][ C1] ? __ip6_finish_output+0x444/0xa50 [ 439.120616][ C1] ip6_finish_output+0x38/0x1f0 [ 439.125486][ C1] ip6_output+0x235/0x7c0 [ 439.129847][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 439.134967][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 439.140950][ C1] ndisc_send_skb+0xf29/0x1450 [ 439.145728][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 439.151055][ C1] ? skb_set_owner_w+0x21b/0x320 [ 439.155988][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 439.161700][ C1] ndisc_send_ns+0x3a9/0x850 [ 439.166276][ C1] ? mark_held_locks+0xa4/0xf0 [ 439.171049][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 439.176229][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 439.181501][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 439.186704][ C1] ? trace_hardirqs_on+0x67/0x240 [ 439.191752][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 439.196947][ C1] addrconf_dad_work+0xb88/0x1150 [ 439.201976][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 439.207811][ C1] process_one_work+0x9af/0x1740 [ 439.212946][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 439.218428][ C1] ? lock_acquire+0x190/0x410 [ 439.223105][ C1] worker_thread+0x98/0xe40 [ 439.227597][ C1] ? trace_hardirqs_on+0x67/0x240 [ 439.232617][ C1] kthread+0x361/0x430 [ 439.236681][ C1] ? process_one_work+0x1740/0x1740 [ 439.241891][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 439.248320][ C1] ret_from_fork+0x24/0x30