[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.196308][ T23] audit: type=1800 audit(1568558501.206:25): pid=8539 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.237752][ T23] audit: type=1800 audit(1568558501.206:26): pid=8539 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.275004][ T23] audit: type=1800 audit(1568558501.206:27): pid=8539 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 '10.128.0.35' (ECDSA) to the list of known hosts. syzkaller login: [ 270.906683][ T8690] IPVS: ftp: loaded support on port[0] = 21 [ 270.972114][ T8690] chnl_net:caif_netlink_parms(): no params data found [ 270.998222][ T8690] bridge0: port 1(bridge_slave_0) entered blocking state [ 271.005695][ T8690] bridge0: port 1(bridge_slave_0) entered disabled state [ 271.013615][ T8690] device bridge_slave_0 entered promiscuous mode [ 271.021660][ T8690] bridge0: port 2(bridge_slave_1) entered blocking state [ 271.029208][ T8690] bridge0: port 2(bridge_slave_1) entered disabled state [ 271.036841][ T8690] device bridge_slave_1 entered promiscuous mode [ 271.053839][ T8690] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 271.064844][ T8690] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 271.084263][ T8690] team0: Port device team_slave_0 added [ 271.092045][ T8690] team0: Port device team_slave_1 added [ 271.150191][ T8690] device hsr_slave_0 entered promiscuous mode [ 271.217920][ T8690] device hsr_slave_1 entered promiscuous mode [ 271.305318][ T8690] bridge0: port 2(bridge_slave_1) entered blocking state [ 271.312736][ T8690] bridge0: port 2(bridge_slave_1) entered forwarding state [ 271.320606][ T8690] bridge0: port 1(bridge_slave_0) entered blocking state [ 271.327820][ T8690] bridge0: port 1(bridge_slave_0) entered forwarding state [ 271.362740][ T8690] 8021q: adding VLAN 0 to HW filter on device bond0 [ 271.374059][ T108] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 271.394091][ T108] bridge0: port 1(bridge_slave_0) entered disabled state [ 271.402938][ T108] bridge0: port 2(bridge_slave_1) entered disabled state [ 271.412189][ T108] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 271.423787][ T8690] 8021q: adding VLAN 0 to HW filter on device team0 [ 271.434508][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 271.443130][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 271.450329][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 271.468359][ T8693] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 271.476846][ T8693] bridge0: port 2(bridge_slave_1) entered blocking state [ 271.483952][ T8693] bridge0: port 2(bridge_slave_1) entered forwarding state [ 271.493547][ T8693] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 271.504234][ T108] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 271.512237][ T108] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 271.524732][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 271.537263][ T8692] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 271.546471][ T8690] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 271.563737][ T8690] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 376.667531][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 376.674276][ C0] rcu: 0-...!: (10499 ticks this GP) idle=372/1/0x4000000000000002 softirq=10618/10618 fqs=14 [ 376.684846][ C0] (t=10501 jiffies g=7789 q=49) [ 376.689784][ C0] rcu: rcu_preempt kthread starved for 10474 jiffies! g7789 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 376.701033][ C0] rcu: RCU grace-period kthread stack dump: [ 376.706903][ C0] rcu_preempt I29688 10 2 0x80004000 [ 376.713361][ C0] Call Trace: [ 376.716736][ C0] __schedule+0x755/0x1580 [ 376.721152][ C0] ? __sched_text_start+0x8/0x8 [ 376.725999][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 376.731793][ C0] ? schedule_timeout+0x47c/0xc50 [ 376.736803][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 376.742077][ C0] schedule+0xd9/0x260 [ 376.746161][ C0] schedule_timeout+0x486/0xc50 [ 376.751008][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 376.756816][ C0] ? usleep_range+0x170/0x170 [ 376.761487][ C0] ? trace_hardirqs_on+0x67/0x240 [ 376.766513][ C0] ? __kasan_check_read+0x11/0x20 [ 376.771537][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 376.777176][ C0] ? swake_up_one+0x60/0x60 [ 376.781674][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 376.786425][ C0] ? rcu_barrier+0x310/0x310 [ 376.791778][ C0] ? trace_hardirqs_on+0x67/0x240 [ 376.796785][ C0] ? __kasan_check_read+0x11/0x20 [ 376.801795][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 376.808279][ C0] ? __kthread_parkme+0x108/0x1c0 [ 376.813285][ C0] ? __kasan_check_read+0x11/0x20 [ 376.818294][ C0] kthread+0x361/0x430 [ 376.822347][ C0] ? rcu_barrier+0x310/0x310 [ 376.827012][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 376.833236][ C0] ret_from_fork+0x24/0x30 [ 376.837671][ C0] NMI backtrace for cpu 0 [ 376.842014][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc7+ #0 [ 376.849344][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 376.859384][ C0] Call Trace: [ 376.862658][ C0] [ 376.865540][ C0] dump_stack+0x172/0x1f0 [ 376.869873][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 376.875056][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 376.881286][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 376.886901][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 376.892864][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 376.898743][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 376.903858][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 376.909395][ C0] ? raise_softirq+0x138/0x340 [ 376.914153][ C0] update_process_times+0x32/0x80 [ 376.919164][ C0] tick_sched_handle+0xa2/0x190 [ 376.924004][ C0] tick_sched_timer+0x53/0x140 [ 376.928757][ C0] __hrtimer_run_queues+0x364/0xe40 [ 376.933940][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 376.939225][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 376.944754][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 376.950458][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 376.956512][ C0] hrtimer_interrupt+0x314/0x770 [ 376.961497][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 376.967042][ C0] apic_timer_interrupt+0xf/0x20 [ 376.971959][ C0] [ 376.974913][ C0] RIP: 0010:hhf_dequeue+0x5a6/0xa20 [ 376.980099][ C0] Code: b5 ac 03 00 00 e8 6a 91 aa fb 49 8d bd 14 03 00 00 48 89 f8 48 c1 e8 03 42 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 <84> d2 0f 85 3f 04 00 00 45 0f af b5 14 03 00 00 48 89 df 45 01 fe [ 376.999696][ C0] RSP: 0018:ffff8880a98b69a8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 377.008088][ C0] RAX: 0000000000000007 RBX: ffff88808f999538 RCX: ffffffff85c7df19 [ 377.016043][ C0] RDX: 0000000000000000 RSI: ffffffff85c7e3e6 RDI: ffff88808f999554 [ 377.023998][ C0] RBP: ffff8880a98b69f8 R08: ffff8880a98a4240 R09: fffffbfff14e9755 [ 377.031965][ C0] R10: ffff8880a98a4b98 R11: ffff8880a98a4240 R12: dffffc0000000000 [ 377.039944][ C0] R13: ffff88808f999240 R14: 0000000000000002 R15: 0000000000000000 [ 377.047913][ C0] ? hhf_dequeue+0xb9/0xa20 [ 377.052410][ C0] ? hhf_dequeue+0x586/0xa20 [ 377.056988][ C0] ? hhf_dequeue+0x586/0xa20 [ 377.061618][ C0] __qdisc_run+0x1e7/0x19d0 [ 377.066142][ C0] ? dev_queue_xmit+0x18/0x20 [ 377.070806][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 377.075812][ C0] ? process_backlog+0x206/0x750 [ 377.080745][ C0] ? net_rx_action+0x4d6/0x1080 [ 377.085578][ C0] ? __do_softirq+0x262/0x98c [ 377.090247][ C0] ? run_ksoftirqd+0x8e/0x110 [ 377.094914][ C0] ? smpboot_thread_fn+0x6a3/0xa40 [ 377.100014][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 377.105341][ C0] ? __skb_ext_put+0xd9/0x210 [ 377.110008][ C0] dev_queue_xmit+0x18/0x20 [ 377.114493][ C0] ? dev_queue_xmit+0x18/0x20 [ 377.119710][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 377.125105][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 377.129773][ C0] ? lock_downgrade+0x920/0x920 [ 377.134675][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 377.139957][ C0] br_nf_post_routing+0x1502/0x1d30 [ 377.145157][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 377.150685][ C0] ? mark_held_locks+0xf0/0xf0 [ 377.155447][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 377.161248][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 377.167083][ C0] nf_hook_slow+0xbc/0x1e0 [ 377.171489][ C0] br_forward_finish+0x215/0x400 [ 377.176675][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 377.182205][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 377.186960][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 377.192662][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 377.197244][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 377.202173][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 377.207701][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 377.212799][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 377.218325][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 377.224561][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 377.230439][ C0] br_nf_forward_finish+0x66c/0xa90 [ 377.235620][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 377.241178][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 377.246101][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 377.251372][ C0] ? mark_held_locks+0xf0/0xf0 [ 377.256215][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 377.261306][ C0] ? __vlan_flush+0x120/0x120 [ 377.267883][ C0] nf_hook_slow+0xbc/0x1e0 [ 377.272287][ C0] __br_forward+0x393/0xb00 [ 377.276787][ C0] ? br_forward_finish+0x400/0x400 [ 377.281887][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 377.287449][ C0] deliver_clone+0x61/0xc0 [ 377.291861][ C0] br_flood+0x325/0x3d0 [ 377.296019][ C0] br_handle_frame_finish+0xb46/0x1670 [ 377.301472][ C0] ? br_handle_local_finish+0x20/0x20 [ 377.306831][ C0] ? audit_alloc_mark+0x3d0/0x500 [ 377.311862][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 377.317563][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 377.322153][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 377.327086][ C0] ? br_handle_local_finish+0x20/0x20 [ 377.332444][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 377.337545][ C0] ? find_held_lock+0x35/0x130 [ 377.342303][ C0] ? br_handle_local_finish+0x20/0x20 [ 377.347668][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 377.353543][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 377.363940][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 377.369988][ C0] ? br_handle_local_finish+0x20/0x20 [ 377.375346][ C0] ? __kasan_check_read+0x11/0x20 [ 377.380372][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 377.385726][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 377.390745][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 377.396980][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 377.403292][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 377.409519][ C0] ? skb_pull_rcsum+0x155/0x300 [ 377.414359][ C0] br_nf_pre_routing+0x1743/0x2355 [ 377.419463][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 377.425349][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 377.431221][ C0] br_handle_frame+0x806/0x133e [ 377.436055][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 377.441752][ C0] ? kfree_skb+0x10e/0x3c0 [ 377.446157][ C0] ? br_handle_local_finish+0x20/0x20 [ 377.451516][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 377.457218][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 377.462834][ C0] ? __kasan_check_read+0x11/0x20 [ 377.467852][ C0] ? do_xdp_generic+0x50/0x50 [ 377.472509][ C0] ? __kasan_check_read+0x11/0x20 [ 377.477519][ C0] ? __lock_acquire+0x8a2/0x4c30 [ 377.482512][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 377.488269][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 377.494059][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 377.500029][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 377.505903][ C0] ? lock_acquire+0x190/0x410 [ 377.510578][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 377.516802][ C0] __netif_receive_skb+0x2c/0x1d0 [ 377.521812][ C0] process_backlog+0x206/0x750 [ 377.526563][ C0] ? net_rx_action+0x249/0x1080 [ 377.531397][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 377.536679][ C0] net_rx_action+0x4d6/0x1080 [ 377.541344][ C0] ? napi_busy_loop+0x970/0x970 [ 377.546188][ C0] ? sched_clock+0x2e/0x50 [ 377.550589][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 377.556826][ C0] __do_softirq+0x262/0x98c [ 377.561318][ C0] ? takeover_tasklets+0x820/0x820 [ 377.566408][ C0] run_ksoftirqd+0x8e/0x110 [ 377.570899][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 377.575822][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 377.582041][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 377.588260][ C0] ? __kthread_parkme+0x108/0x1c0 [ 377.593277][ C0] ? __kasan_check_read+0x11/0x20 [ 377.598282][ C0] kthread+0x361/0x430 [ 377.602335][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 377.608559][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 377.614780][ C0] ret_from_fork+0x24/0x30