[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.076997][ T26] audit: type=1800 audit(1568391649.560:25): pid=8555 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.121363][ T26] audit: type=1800 audit(1568391649.570:26): pid=8555 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.143566][ T26] audit: type=1800 audit(1568391649.570:27): pid=8555 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 '10.128.0.21' (ECDSA) to the list of known hosts. syzkaller login: [ 235.536007][ T8712] IPVS: ftp: loaded support on port[0] = 21 [ 235.591005][ T8712] chnl_net:caif_netlink_parms(): no params data found [ 235.617704][ T8712] bridge0: port 1(bridge_slave_0) entered blocking state [ 235.625718][ T8712] bridge0: port 1(bridge_slave_0) entered disabled state [ 235.633554][ T8712] device bridge_slave_0 entered promiscuous mode [ 235.641700][ T8712] bridge0: port 2(bridge_slave_1) entered blocking state [ 235.648775][ T8712] bridge0: port 2(bridge_slave_1) entered disabled state [ 235.656823][ T8712] device bridge_slave_1 entered promiscuous mode [ 235.673968][ T8712] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 235.684486][ T8712] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 235.703649][ T8712] team0: Port device team_slave_0 added [ 235.711214][ T8712] team0: Port device team_slave_1 added [ 235.791497][ T8712] device hsr_slave_0 entered promiscuous mode [ 235.860239][ T8712] device hsr_slave_1 entered promiscuous mode [ 235.937458][ T8712] bridge0: port 2(bridge_slave_1) entered blocking state [ 235.944695][ T8712] bridge0: port 2(bridge_slave_1) entered forwarding state [ 235.952570][ T8712] bridge0: port 1(bridge_slave_0) entered blocking state [ 235.959679][ T8712] bridge0: port 1(bridge_slave_0) entered forwarding state [ 235.995476][ T8712] 8021q: adding VLAN 0 to HW filter on device bond0 [ 236.006768][ T8714] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 236.026906][ T8714] bridge0: port 1(bridge_slave_0) entered disabled state [ 236.035642][ T8714] bridge0: port 2(bridge_slave_1) entered disabled state [ 236.044475][ T8714] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 236.055704][ T8712] 8021q: adding VLAN 0 to HW filter on device team0 [ 236.066490][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 236.075215][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 236.082378][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 236.101017][ T8717] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 236.109494][ T8717] bridge0: port 2(bridge_slave_1) entered blocking state [ 236.116608][ T8717] bridge0: port 2(bridge_slave_1) entered forwarding state [ 236.125834][ T8717] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 236.138078][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 236.146190][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 236.157395][ T8714] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 236.168652][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 236.179474][ T8712] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program executing program executing program [ 236.198836][ T8712] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 341.379508][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 341.386237][ C0] rcu: 0-...!: (10499 ticks this GP) idle=31e/1/0x4000000000000002 softirq=10003/10003 fqs=0 [ 341.396685][ C0] (t=10501 jiffies g=7793 q=108) [ 341.401695][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g7793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 341.412953][ C0] rcu: RCU grace-period kthread stack dump: [ 341.418825][ C0] rcu_preempt I29112 10 2 0x80004000 [ 341.425157][ C0] Call Trace: [ 341.428535][ C0] __schedule+0x755/0x1580 [ 341.432944][ C0] ? __sched_text_start+0x8/0x8 [ 341.437782][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 341.443585][ C0] ? schedule_timeout+0x47c/0xc50 [ 341.448596][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 341.453875][ C0] schedule+0xd9/0x260 [ 341.457933][ C0] schedule_timeout+0x486/0xc50 [ 341.462777][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 341.468567][ C0] ? usleep_range+0x170/0x170 [ 341.473243][ C0] ? trace_hardirqs_on+0x67/0x240 [ 341.478262][ C0] ? __kasan_check_read+0x11/0x20 [ 341.483279][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 341.488810][ C0] ? swake_up_one+0x60/0x60 [ 341.493303][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 341.498056][ C0] ? rcu_barrier+0x310/0x310 [ 341.502629][ C0] ? trace_hardirqs_on+0x67/0x240 [ 341.507635][ C0] ? __kasan_check_read+0x11/0x20 [ 341.512658][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 341.518882][ C0] ? __kthread_parkme+0x108/0x1c0 [ 341.523904][ C0] ? __kasan_check_read+0x11/0x20 [ 341.528922][ C0] kthread+0x361/0x430 [ 341.532977][ C0] ? rcu_barrier+0x310/0x310 [ 341.537552][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 341.543788][ C0] ret_from_fork+0x24/0x30 [ 341.548230][ C0] NMI backtrace for cpu 0 [ 341.552550][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc7+ #0 [ 341.559821][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 341.569877][ C0] Call Trace: [ 341.573155][ C0] [ 341.576059][ C0] dump_stack+0x172/0x1f0 [ 341.580379][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 341.585563][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 341.591802][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 341.597428][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 341.603397][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 341.609323][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 341.614436][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 341.619977][ C0] ? raise_softirq+0x138/0x340 [ 341.624757][ C0] update_process_times+0x32/0x80 [ 341.629778][ C0] tick_sched_handle+0xa2/0x190 [ 341.634627][ C0] tick_sched_timer+0x53/0x140 [ 341.639388][ C0] __hrtimer_run_queues+0x364/0xe40 [ 341.644582][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 341.649865][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 341.655397][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 341.661099][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 341.667175][ C0] hrtimer_interrupt+0x314/0x770 [ 341.672194][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 341.677816][ C0] apic_timer_interrupt+0xf/0x20 [ 341.682735][ C0] [ 341.685663][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x9/0x20 [ 341.692425][ C0] Code: 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 0f b6 d6 40 0f b6 f7 01 00 00 00 48 89 e5 48 8b 4d 08 e8 f6 fe ff ff 5d c3 0f 1f 40 [ 341.712030][ C0] RSP: 0018:ffff8880a98b6998 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 341.720429][ C0] RAX: 0000000000000001 RBX: ffff888099b00338 RCX: ffffffff85c7dbb9 [ 341.728385][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 [ 341.736343][ C0] RBP: ffff8880a98b69f8 R08: ffff8880a98a4240 R09: fffffbfff14e9755 [ 341.744301][ C0] R10: ffff8880a98a4b98 R11: ffff8880a98a4240 R12: dffffc0000000000 [ 341.752267][ C0] R13: ffff888099b00040 R14: 0000000000000001 R15: 0000000000000000 [ 341.760292][ C0] ? hhf_dequeue+0xb9/0xa20 [ 341.764951][ C0] ? hhf_dequeue+0x5d1/0xa20 [ 341.769637][ C0] __qdisc_run+0x1e7/0x19d0 [ 341.774191][ C0] ? dev_queue_xmit+0x18/0x20 [ 341.778861][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 341.783867][ C0] ? process_backlog+0x206/0x750 [ 341.788783][ C0] ? net_rx_action+0x4d6/0x1080 [ 341.793618][ C0] ? __do_softirq+0x262/0x98c [ 341.798277][ C0] ? run_ksoftirqd+0x8e/0x110 [ 341.802937][ C0] ? smpboot_thread_fn+0x6a3/0xa40 [ 341.808038][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 341.813378][ C0] ? __skb_ext_put+0xd9/0x210 [ 341.818049][ C0] dev_queue_xmit+0x18/0x20 [ 341.822542][ C0] ? dev_queue_xmit+0x18/0x20 [ 341.827263][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 341.832654][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 341.837322][ C0] ? lock_downgrade+0x920/0x920 [ 341.842262][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 341.847558][ C0] br_nf_post_routing+0x1502/0x1d30 [ 341.852755][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 341.858295][ C0] ? mark_held_locks+0xf0/0xf0 [ 341.863058][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 341.868848][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 341.874694][ C0] nf_hook_slow+0xbc/0x1e0 [ 341.879112][ C0] br_forward_finish+0x215/0x400 [ 341.884035][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 341.889592][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 341.894358][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 341.900066][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 341.904646][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 341.909569][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 341.915101][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 341.920212][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 341.925742][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 341.931969][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 341.937861][ C0] br_nf_forward_finish+0x66c/0xa90 [ 341.943046][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 341.948580][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 341.953505][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 341.958773][ C0] ? mark_held_locks+0xf0/0xf0 [ 341.963522][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 341.968625][ C0] ? __vlan_flush+0x120/0x120 [ 341.973290][ C0] nf_hook_slow+0xbc/0x1e0 [ 341.977692][ C0] __br_forward+0x393/0xb00 [ 341.982182][ C0] ? br_forward_finish+0x400/0x400 [ 341.987279][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 341.992815][ C0] deliver_clone+0x61/0xc0 [ 341.997222][ C0] br_flood+0x325/0x3d0 [ 342.001373][ C0] br_handle_frame_finish+0xb46/0x1670 [ 342.006823][ C0] ? br_handle_local_finish+0x20/0x20 [ 342.012207][ C0] ? audit_alloc_mark+0x3d0/0x500 [ 342.017231][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 342.022934][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 342.027513][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 342.032466][ C0] ? br_handle_local_finish+0x20/0x20 [ 342.037825][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 342.042925][ C0] ? find_held_lock+0x35/0x130 [ 342.047689][ C0] ? br_handle_local_finish+0x20/0x20 [ 342.053050][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 342.058927][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 342.064808][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 342.070870][ C0] ? br_handle_local_finish+0x20/0x20 [ 342.076238][ C0] ? __kasan_check_read+0x11/0x20 [ 342.081252][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 342.086609][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 342.091635][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 342.097771][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 342.103994][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 342.110216][ C0] ? skb_pull_rcsum+0x155/0x300 [ 342.115049][ C0] br_nf_pre_routing+0x1743/0x2355 [ 342.120147][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 342.126033][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 342.131908][ C0] br_handle_frame+0x806/0x133e [ 342.136747][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 342.142564][ C0] ? kfree_skb+0x10e/0x3c0 [ 342.146983][ C0] ? br_handle_local_finish+0x20/0x20 [ 342.152344][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 342.158047][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 342.163668][ C0] ? __kasan_check_read+0x11/0x20 [ 342.168677][ C0] ? do_xdp_generic+0x50/0x50 [ 342.173351][ C0] ? __kasan_check_read+0x11/0x20 [ 342.178358][ C0] ? __lock_acquire+0x8a2/0x4c30 [ 342.183342][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 342.188784][ C0] ? cpuacct_charge+0x1db/0x360 [ 342.193627][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 342.199416][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 342.205378][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 342.211252][ C0] ? lock_acquire+0x190/0x410 [ 342.215912][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 342.222138][ C0] __netif_receive_skb+0x2c/0x1d0 [ 342.227233][ C0] process_backlog+0x206/0x750 [ 342.231981][ C0] ? net_rx_action+0x249/0x1080 [ 342.236814][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 342.242085][ C0] net_rx_action+0x4d6/0x1080 [ 342.246752][ C0] ? napi_busy_loop+0x970/0x970 [ 342.251672][ C0] ? sched_clock+0x2e/0x50 [ 342.256082][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 342.262314][ C0] __do_softirq+0x262/0x98c [ 342.266817][ C0] ? takeover_tasklets+0x820/0x820 [ 342.271909][ C0] run_ksoftirqd+0x8e/0x110 [ 342.276400][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 342.281323][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 342.288770][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 342.295000][ C0] ? __kthread_parkme+0x108/0x1c0 [ 342.300006][ C0] ? __kasan_check_read+0x11/0x20 [ 342.305024][ C0] kthread+0x361/0x430 [ 342.309075][ C0] ? smpboot_register_percpu_thread+0x390/0x390 [ 342.315300][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 342.321528][ C0] ret_from_fork+0x24/0x30