[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.592712][ T26] audit: type=1800 audit(1568398794.594:25): pid=8591 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.635665][ T26] audit: type=1800 audit(1568398794.594:26): pid=8591 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.692115][ T26] audit: type=1800 audit(1568398794.594:27): pid=8591 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 '10.128.1.46' (ECDSA) to the list of known hosts. syzkaller login: [ 322.879078][ T8746] IPVS: ftp: loaded support on port[0] = 21 [ 322.941382][ T8746] chnl_net:caif_netlink_parms(): no params data found [ 322.968456][ T8746] bridge0: port 1(bridge_slave_0) entered blocking state [ 322.975688][ T8746] bridge0: port 1(bridge_slave_0) entered disabled state [ 322.983846][ T8746] device bridge_slave_0 entered promiscuous mode [ 322.992636][ T8746] bridge0: port 2(bridge_slave_1) entered blocking state [ 323.000110][ T8746] bridge0: port 2(bridge_slave_1) entered disabled state [ 323.008869][ T8746] device bridge_slave_1 entered promiscuous mode [ 323.025610][ T8746] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 323.036160][ T8746] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 323.054771][ T8746] team0: Port device team_slave_0 added [ 323.062302][ T8746] team0: Port device team_slave_1 added [ 323.137898][ T8746] device hsr_slave_0 entered promiscuous mode [ 323.175834][ T8746] device hsr_slave_1 entered promiscuous mode [ 323.242990][ T8746] bridge0: port 2(bridge_slave_1) entered blocking state [ 323.250159][ T8746] bridge0: port 2(bridge_slave_1) entered forwarding state [ 323.258155][ T8746] bridge0: port 1(bridge_slave_0) entered blocking state [ 323.265209][ T8746] bridge0: port 1(bridge_slave_0) entered forwarding state [ 323.298253][ T8746] 8021q: adding VLAN 0 to HW filter on device bond0 [ 323.310953][ T8749] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 323.320441][ T8749] bridge0: port 1(bridge_slave_0) entered disabled state [ 323.339122][ T8749] bridge0: port 2(bridge_slave_1) entered disabled state [ 323.347779][ T8749] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 323.359979][ T8746] 8021q: adding VLAN 0 to HW filter on device team0 [ 323.369782][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 323.378818][ T8750] bridge0: port 1(bridge_slave_0) entered blocking state [ 323.385924][ T8750] bridge0: port 1(bridge_slave_0) entered forwarding state [ 323.396976][ T8749] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 323.405319][ T8749] bridge0: port 2(bridge_slave_1) entered blocking state [ 323.412432][ T8749] bridge0: port 2(bridge_slave_1) entered forwarding state [ 323.434215][ T8746] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 323.445175][ T8746] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 323.459214][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 323.468078][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 323.477139][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 323.485795][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 323.495133][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 323.502798][ T8750] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 323.518514][ T8746] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 428.555359][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 428.562093][ C1] rcu: 1-...!: (10499 ticks this GP) idle=79a/1/0x4000000000000002 softirq=9471/9471 fqs=8 [ 428.572367][ C1] (t=10500 jiffies g=7321 q=70) [ 428.577296][ C1] rcu: rcu_preempt kthread starved for 10484 jiffies! g7321 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 428.588552][ C1] rcu: RCU grace-period kthread stack dump: [ 428.594422][ C1] rcu_preempt I29320 10 2 0x80004000 [ 428.600738][ C1] Call Trace: [ 428.604096][ C1] __schedule+0x755/0x1580 [ 428.608501][ C1] ? __sched_text_start+0x8/0x8 [ 428.613335][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 428.619122][ C1] ? schedule_timeout+0x47c/0xc50 [ 428.624135][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 428.629411][ C1] schedule+0xd9/0x260 [ 428.633464][ C1] schedule_timeout+0x486/0xc50 [ 428.638293][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 428.644095][ C1] ? usleep_range+0x170/0x170 [ 428.648752][ C1] ? trace_hardirqs_on+0x67/0x240 [ 428.653770][ C1] ? __kasan_check_read+0x11/0x20 [ 428.658800][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 428.664331][ C1] ? swake_up_one+0x60/0x60 [ 428.668833][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 428.673594][ C1] ? rcu_barrier+0x310/0x310 [ 428.678167][ C1] ? trace_hardirqs_on+0x67/0x240 [ 428.683177][ C1] ? __kasan_check_read+0x11/0x20 [ 428.688194][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 428.694600][ C1] ? __kthread_parkme+0x108/0x1c0 [ 428.699604][ C1] ? __kasan_check_read+0x11/0x20 [ 428.704610][ C1] kthread+0x361/0x430 [ 428.708663][ C1] ? rcu_barrier+0x310/0x310 [ 428.713234][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 428.719458][ C1] ret_from_fork+0x24/0x30 [ 428.723898][ C1] NMI backtrace for cpu 1 [ 428.728223][ C1] CPU: 1 PID: 8749 Comm: kworker/1:0 Not tainted 5.3.0-rc7+ #0 [ 428.735777][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 428.745865][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 428.751823][ C1] Call Trace: [ 428.755087][ C1] [ 428.757949][ C1] dump_stack+0x172/0x1f0 [ 428.762266][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 428.767445][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 428.773668][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 428.779281][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 428.785243][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 428.791118][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 428.796215][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 428.801742][ C1] ? raise_softirq+0x138/0x340 [ 428.806505][ C1] update_process_times+0x32/0x80 [ 428.811525][ C1] tick_sched_handle+0xa2/0x190 [ 428.816358][ C1] tick_sched_timer+0x53/0x140 [ 428.821104][ C1] __hrtimer_run_queues+0x364/0xe40 [ 428.826285][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 428.831555][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 428.837082][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 428.842788][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 428.848837][ C1] hrtimer_interrupt+0x314/0x770 [ 428.853796][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 428.859323][ C1] apic_timer_interrupt+0xf/0x20 [ 428.864243][ C1] [ 428.867166][ C1] RIP: 0010:__list_add_valid+0x3b/0xa0 [ 428.872607][ C1] Code: 89 fd 48 8d 7a 08 41 54 49 89 d4 48 89 fa 48 83 ec 08 48 c1 ea 03 80 3c 02 00 75 52 49 8b 54 24 08 48 39 f2 0f 85 5a 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 80 3c 02 00 75 [ 428.892189][ C1] RSP: 0018:ffff8880873cf3d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 428.900591][ C1] RAX: dffffc0000000000 RBX: ffff88808c9ac338 RCX: ffffffff85c7e0d1 [ 428.908541][ C1] RDX: ffff88808c9ac3d0 RSI: ffff88808c9ac3d0 RDI: ffff88808c9ac3d8 [ 428.916499][ C1] RBP: ffff8880873cf3e8 R08: ffff88808ec624c0 R09: fffffbfff14e9755 [ 428.924452][ C1] R10: ffff88808ec62e68 R11: ffff88808ec624c0 R12: ffff88808c9ac3d0 [ 428.932402][ C1] R13: ffff88808c9ac338 R14: ffff88808c9ac3d8 R15: ffff88808c9ac3d0 [ 428.940401][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 428.944989][ C1] hhf_dequeue+0x66d/0xa20 [ 428.949428][ C1] __qdisc_run+0x1e7/0x19d0 [ 428.953940][ C1] ? dev_queue_xmit+0x18/0x20 [ 428.958605][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 428.963611][ C1] ? __kasan_check_read+0x11/0x20 [ 428.968621][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 428.973888][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 428.979243][ C1] ? __kasan_check_read+0x11/0x20 [ 428.984257][ C1] ? mark_held_locks+0xa4/0xf0 [ 428.989010][ C1] dev_queue_xmit+0x18/0x20 [ 428.993500][ C1] ? dev_queue_xmit+0x18/0x20 [ 428.998189][ C1] neigh_resolve_output+0x5a5/0x970 [ 429.003376][ C1] ip6_finish_output2+0x1034/0x2520 [ 429.008583][ C1] ? ip6_mtu+0x2e6/0x460 [ 429.012811][ C1] ? ip6_forward_finish+0x530/0x530 [ 429.018080][ C1] ? lock_downgrade+0x920/0x920 [ 429.023792][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 429.030014][ C1] ? __kasan_check_read+0x11/0x20 [ 429.035025][ C1] __ip6_finish_output+0x444/0xa50 [ 429.040121][ C1] ? __ip6_finish_output+0x444/0xa50 [ 429.045387][ C1] ip6_finish_output+0x38/0x1f0 [ 429.050222][ C1] ip6_output+0x235/0x7c0 [ 429.054531][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 429.059627][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 429.064928][ C1] ndisc_send_skb+0xf29/0x1450 [ 429.069678][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 429.074982][ C1] ? skb_set_owner_w+0x21b/0x320 [ 429.079902][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 429.085604][ C1] ndisc_send_ns+0x3a9/0x850 [ 429.090174][ C1] ? mark_held_locks+0xa4/0xf0 [ 429.094919][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 429.100094][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 429.105380][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 429.110589][ C1] ? trace_hardirqs_on+0x67/0x240 [ 429.115605][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 429.120796][ C1] addrconf_dad_work+0xb88/0x1150 [ 429.125814][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 429.131353][ C1] process_one_work+0x9af/0x1740 [ 429.136281][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 429.141660][ C1] ? lock_acquire+0x190/0x410 [ 429.146339][ C1] worker_thread+0x98/0xe40 [ 429.150837][ C1] ? trace_hardirqs_on+0x67/0x240 [ 429.155864][ C1] kthread+0x361/0x430 [ 429.159916][ C1] ? process_one_work+0x1740/0x1740 [ 429.165102][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 429.171324][ C1] ret_from_fork+0x24/0x30