[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.166122][ T26] audit: type=1800 audit(1568285407.727:25): pid=8563 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.204273][ T26] audit: type=1800 audit(1568285407.727:26): pid=8563 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.254490][ T26] audit: type=1800 audit(1568285407.727:27): pid=8563 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 '10.128.0.56' (ECDSA) to the list of known hosts. syzkaller login: [ 304.410900][ T8718] IPVS: ftp: loaded support on port[0] = 21 [ 304.476276][ T8718] chnl_net:caif_netlink_parms(): no params data found [ 304.503417][ T8718] bridge0: port 1(bridge_slave_0) entered blocking state [ 304.511401][ T8718] bridge0: port 1(bridge_slave_0) entered disabled state [ 304.519492][ T8718] device bridge_slave_0 entered promiscuous mode [ 304.527587][ T8718] bridge0: port 2(bridge_slave_1) entered blocking state [ 304.534751][ T8718] bridge0: port 2(bridge_slave_1) entered disabled state [ 304.542441][ T8718] device bridge_slave_1 entered promiscuous mode [ 304.559047][ T8718] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 304.570095][ T8718] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 304.592346][ T8718] team0: Port device team_slave_0 added [ 304.600475][ T8718] team0: Port device team_slave_1 added [ 304.666707][ T8718] device hsr_slave_0 entered promiscuous mode [ 304.734362][ T8718] device hsr_slave_1 entered promiscuous mode [ 304.821203][ T8718] bridge0: port 2(bridge_slave_1) entered blocking state [ 304.828569][ T8718] bridge0: port 2(bridge_slave_1) entered forwarding state [ 304.836434][ T8718] bridge0: port 1(bridge_slave_0) entered blocking state [ 304.843482][ T8718] bridge0: port 1(bridge_slave_0) entered forwarding state [ 304.878715][ T8718] 8021q: adding VLAN 0 to HW filter on device bond0 [ 304.889869][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 304.910346][ T3014] bridge0: port 1(bridge_slave_0) entered disabled state [ 304.918896][ T3014] bridge0: port 2(bridge_slave_1) entered disabled state [ 304.928052][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 304.939469][ T8718] 8021q: adding VLAN 0 to HW filter on device team0 [ 304.949877][ T3517] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 304.958709][ T3517] bridge0: port 1(bridge_slave_0) entered blocking state [ 304.965795][ T3517] bridge0: port 1(bridge_slave_0) entered forwarding state [ 304.986387][ T8722] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 304.996365][ T8722] bridge0: port 2(bridge_slave_1) entered blocking state [ 305.003412][ T8722] bridge0: port 2(bridge_slave_1) entered forwarding state [ 305.011743][ T8722] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 305.021909][ T8722] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready executing program [ 305.031638][ T8722] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 305.040968][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 305.051773][ T8722] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 305.061999][ T8718] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 305.079937][ T8718] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 410.453988][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 410.460844][ C1] rcu: 1-...!: (10521 ticks this GP) idle=ac6/1/0x4000000000000004 softirq=9495/9496 fqs=7 [ 410.471141][ C1] (t=10500 jiffies g=7137 q=5) [ 410.475978][ C1] rcu: rcu_preempt kthread starved for 10486 jiffies! g7137 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 410.487227][ C1] rcu: RCU grace-period kthread stack dump: [ 410.493098][ C1] rcu_preempt I29112 10 2 0x80004000 [ 410.499421][ C1] Call Trace: [ 410.502782][ C1] __schedule+0x755/0x1580 [ 410.507237][ C1] ? __sched_text_start+0x8/0x8 [ 410.512086][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 410.517873][ C1] ? schedule_timeout+0x47c/0xc50 [ 410.522884][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 410.528155][ C1] schedule+0xd9/0x260 [ 410.532208][ C1] schedule_timeout+0x486/0xc50 [ 410.537060][ C1] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 410.542855][ C1] ? usleep_range+0x170/0x170 [ 410.547528][ C1] ? trace_hardirqs_on+0x67/0x240 [ 410.552546][ C1] ? __kasan_check_read+0x11/0x20 [ 410.557578][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 410.563119][ C1] ? swake_up_one+0x60/0x60 [ 410.567610][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 410.572389][ C1] ? rcu_barrier+0x310/0x310 [ 410.577056][ C1] ? trace_hardirqs_on+0x67/0x240 [ 410.582080][ C1] ? __kasan_check_read+0x11/0x20 [ 410.587137][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 410.593540][ C1] ? __kthread_parkme+0x108/0x1c0 [ 410.598564][ C1] ? __kasan_check_read+0x11/0x20 [ 410.603583][ C1] kthread+0x361/0x430 [ 410.607653][ C1] ? rcu_barrier+0x310/0x310 [ 410.612250][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 410.618484][ C1] ret_from_fork+0x24/0x30 [ 410.622949][ C1] NMI backtrace for cpu 1 [ 410.627280][ C1] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0 [ 410.634694][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 410.644800][ C1] Workqueue: events iterate_cleanup_work [ 410.650409][ C1] Call Trace: [ 410.653676][ C1] [ 410.656547][ C1] dump_stack+0x172/0x1f0 [ 410.660862][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 410.666043][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 410.672362][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 410.677975][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 410.683939][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 410.689816][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 410.694917][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 410.700454][ C1] ? raise_softirq+0x138/0x340 [ 410.705211][ C1] update_process_times+0x32/0x80 [ 410.710220][ C1] tick_sched_handle+0xa2/0x190 [ 410.715054][ C1] tick_sched_timer+0x53/0x140 [ 410.719803][ C1] __hrtimer_run_queues+0x364/0xe40 [ 410.724984][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 410.730255][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 410.735922][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 410.741631][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 410.747689][ C1] hrtimer_interrupt+0x314/0x770 [ 410.752756][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 410.758307][ C1] apic_timer_interrupt+0xf/0x20 [ 410.763296][ C1] RIP: 0010:hhf_dequeue+0x599/0xa20 [ 410.768484][ C1] Code: d0 7c 08 84 d2 0f 85 b5 03 00 00 45 8b b5 ac 03 00 00 e8 ca 94 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 [ 410.788082][ C1] RSP: 0018:ffff8880ae908af8 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13 [ 410.796476][ C1] RAX: 1ffff1101442a982 RBX: ffff8880a2154bf8 RCX: ffffffff85c7dbb9 [ 410.804430][ C1] RDX: 0000000000000000 RSI: ffffffff85c7e086 RDI: ffff8880a2154c14 [ 410.812383][ C1] RBP: ffff8880ae908b48 R08: ffff8880a99fe5c0 R09: fffffbfff14e9555 [ 410.820338][ C1] R10: ffff8880a99fef68 R11: ffff8880a99fe5c0 R12: dffffc0000000000 [ 410.828299][ C1] R13: ffff8880a2154900 R14: 0000000000000000 R15: 0000000000000000 [ 410.836272][ C1] ? apic_timer_interrupt+0xa/0x20 [ 410.842498][ C1] ? hhf_dequeue+0xb9/0xa20 [ 410.846981][ C1] ? hhf_dequeue+0x586/0xa20 [ 410.851556][ C1] ? hhf_dequeue+0x586/0xa20 [ 410.856206][ C1] __qdisc_run+0x1e7/0x19d0 [ 410.860757][ C1] ? dev_queue_xmit+0x18/0x20 [ 410.865426][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 410.870436][ C1] ? process_backlog+0x206/0x750 [ 410.875354][ C1] ? net_rx_action+0x4d6/0x1080 [ 410.880187][ C1] ? __do_softirq+0x262/0x98c [ 410.884848][ C1] ? irq_exit+0x19b/0x1e0 [ 410.889168][ C1] ? smp_apic_timer_interrupt+0x1a3/0x610 [ 410.894873][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 410.900187][ C1] ? __skb_ext_put+0xd9/0x210 [ 410.904855][ C1] dev_queue_xmit+0x18/0x20 [ 410.909350][ C1] ? dev_queue_xmit+0x18/0x20 [ 410.914065][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 410.919423][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 410.924080][ C1] ? lock_downgrade+0x920/0x920 [ 410.928941][ C1] br_nf_dev_queue_xmit+0x34e/0x1470 [ 410.934229][ C1] br_nf_post_routing+0x1502/0x1d30 [ 410.939422][ C1] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 410.944952][ C1] ? mark_held_locks+0xf0/0xf0 [ 410.949710][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 410.955496][ C1] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 410.961329][ C1] nf_hook_slow+0xbc/0x1e0 [ 410.965735][ C1] br_forward_finish+0x215/0x400 [ 410.970654][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 410.976296][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 410.981045][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 410.986769][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 410.991348][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 410.996813][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 411.002344][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 411.007443][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 411.012973][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 411.019201][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 411.025122][ C1] br_nf_forward_finish+0x66c/0xa90 [ 411.030303][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 411.035935][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 411.040863][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 411.046146][ C1] ? mark_held_locks+0xf0/0xf0 [ 411.050894][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 411.055989][ C1] ? __vlan_flush+0x120/0x120 [ 411.060655][ C1] nf_hook_slow+0xbc/0x1e0 [ 411.065054][ C1] __br_forward+0x393/0xb00 [ 411.069574][ C1] ? br_forward_finish+0x400/0x400 [ 411.074686][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 411.080232][ C1] deliver_clone+0x61/0xc0 [ 411.084723][ C1] br_flood+0x325/0x3d0 [ 411.088869][ C1] br_handle_frame_finish+0xb46/0x1670 [ 411.094320][ C1] ? br_handle_local_finish+0x20/0x20 [ 411.099754][ C1] ? audit_alloc_mark+0x3d0/0x500 [ 411.104790][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 411.110501][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 411.115101][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 411.120039][ C1] ? br_handle_local_finish+0x20/0x20 [ 411.125406][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 411.130970][ C1] ? find_held_lock+0x35/0x130 [ 411.135728][ C1] ? br_handle_local_finish+0x20/0x20 [ 411.141125][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 411.147006][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 411.152886][ C1] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 411.158852][ C1] ? br_handle_local_finish+0x20/0x20 [ 411.164206][ C1] ? __kasan_check_read+0x11/0x20 [ 411.169270][ C1] br_nf_pre_routing_ipv6+0x456/0x832 [ 411.174640][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 411.179649][ C1] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 411.185790][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 411.192013][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 411.198239][ C1] ? skb_pull_rcsum+0x155/0x300 [ 411.203079][ C1] br_nf_pre_routing+0x1743/0x2355 [ 411.208177][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 411.214060][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 411.219938][ C1] br_handle_frame+0x806/0x133e [ 411.224779][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 411.230480][ C1] ? update_sd_lb_stats+0x2940/0x2940 [ 411.235836][ C1] ? br_handle_local_finish+0x20/0x20 [ 411.241193][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 411.246895][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 411.252517][ C1] ? __kasan_check_read+0x11/0x20 [ 411.257537][ C1] ? do_xdp_generic+0x50/0x50 [ 411.262199][ C1] ? __kasan_check_read+0x11/0x20 [ 411.267206][ C1] ? __lock_acquire+0x8a2/0x4c30 [ 411.272125][ C1] ? load_balance+0x375/0x2680 [ 411.276881][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 411.282666][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 411.288632][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 411.294518][ C1] ? lock_acquire+0x190/0x410 [ 411.299178][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 411.305403][ C1] __netif_receive_skb+0x2c/0x1d0 [ 411.310422][ C1] process_backlog+0x206/0x750 [ 411.315166][ C1] ? net_rx_action+0x249/0x1080 [ 411.320000][ C1] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 411.325282][ C1] net_rx_action+0x4d6/0x1080 [ 411.329954][ C1] ? napi_busy_loop+0x970/0x970 [ 411.334799][ C1] __do_softirq+0x262/0x98c [ 411.339289][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 411.344128][ C1] irq_exit+0x19b/0x1e0 [ 411.348266][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 411.353806][ C1] apic_timer_interrupt+0xf/0x20 [ 411.358743][ C1] [ 411.361665][ C1] RIP: 0010:__local_bh_enable_ip+0x18e/0x270 [ 411.367639][ C1] Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 df 00 00 00 48 83 3d bf 59 ad 07 00 0f 84 8f 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 53 63 bc 7e 85 c0 74 7f 5b 41 5c 41 5d 5d c3 80 3d 3c 39 [ 411.387224][ C1] RSP: 0018:ffff8880a9a0fbb0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 411.395615][ C1] RAX: 1ffffffff11e5e8c RBX: 0000000000000200 RCX: 0000000000000006 [ 411.403570][ C1] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8880a99fee4c [ 411.411526][ C1] RBP: ffff8880a9a0fbc8 R08: 1ffffffff14e9556 R09: fffffbfff14e9557 [ 411.419494][ C1] R10: fffffbfff14e9556 R11: ffffffff8a74aab7 R12: ffffffff85d37db1 [ 411.427458][ C1] R13: ffff8880a99fe5c0 R14: 0000000000000001 R15: dffffc0000000000 [ 411.435440][ C1] ? nf_ct_iterate_cleanup+0x1f1/0x4e0 [ 411.440896][ C1] nf_ct_iterate_cleanup+0x217/0x4e0 [ 411.446178][ C1] ? nf_ct_alloc_hashtable+0x150/0x150 [ 411.451627][ C1] nf_ct_iterate_cleanup_net+0x133/0x190 [ 411.457254][ C1] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 411.464431][ C1] ? nf_ct_iterate_cleanup+0x4e0/0x4e0 [ 411.469875][ C1] ? nf_nat_masquerade_inet_unregister_notifiers+0x80/0x80 [ 411.477068][ C1] iterate_cleanup_work+0x4a/0xd7 [ 411.482078][ C1] process_one_work+0x9af/0x1740 [ 411.487005][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 411.492357][ C1] ? lock_acquire+0x190/0x410 [ 411.497029][ C1] worker_thread+0x98/0xe40 [ 411.501516][ C1] ? trace_hardirqs_on+0x67/0x240 [ 411.506536][ C1] kthread+0x361/0x430 [ 411.510593][ C1] ? process_one_work+0x1740/0x1740 [ 411.515778][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 411.522711][ C1] ret_from_fork+0x24/0x30