[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.135640][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 62.135649][ T26] audit: type=1800 audit(1568461215.177:29): pid=9545 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 62.167304][ T26] audit: type=1800 audit(1568461215.177:30): pid=9545 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. syzkaller login: [ 88.657212][ T9699] IPVS: ftp: loaded support on port[0] = 21 [ 88.698662][ T9699] chnl_net:caif_netlink_parms(): no params data found [ 88.720066][ T9699] bridge0: port 1(bridge_slave_0) entered blocking state [ 88.727713][ T9699] bridge0: port 1(bridge_slave_0) entered disabled state [ 88.735201][ T9699] device bridge_slave_0 entered promiscuous mode [ 88.742230][ T9699] bridge0: port 2(bridge_slave_1) entered blocking state [ 88.749393][ T9699] bridge0: port 2(bridge_slave_1) entered disabled state [ 88.756888][ T9699] device bridge_slave_1 entered promiscuous mode [ 88.769849][ T9699] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 88.780112][ T9699] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 88.796571][ T9699] team0: Port device team_slave_0 added [ 88.802868][ T9699] team0: Port device team_slave_1 added [ 88.884624][ T9699] device hsr_slave_0 entered promiscuous mode [ 88.933468][ T9699] device hsr_slave_1 entered promiscuous mode [ 89.007939][ T9699] bridge0: port 2(bridge_slave_1) entered blocking state [ 89.015126][ T9699] bridge0: port 2(bridge_slave_1) entered forwarding state [ 89.022386][ T9699] bridge0: port 1(bridge_slave_0) entered blocking state [ 89.029461][ T9699] bridge0: port 1(bridge_slave_0) entered forwarding state [ 89.053469][ T9699] 8021q: adding VLAN 0 to HW filter on device bond0 [ 89.064380][ T3021] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 89.072465][ T3021] bridge0: port 1(bridge_slave_0) entered disabled state [ 89.080658][ T3021] bridge0: port 2(bridge_slave_1) entered disabled state [ 89.088235][ T3021] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 89.098582][ T9699] 8021q: adding VLAN 0 to HW filter on device team0 [ 89.107761][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 89.116008][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 89.123206][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 89.132284][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 89.140717][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 89.147914][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 89.160963][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 89.169911][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 89.179737][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 89.190070][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 89.200978][ T9699] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network executing program [ 89.212815][ T9699] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 89.221033][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 89.235971][ T9699] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 194.263116][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 194.269755][ C0] rcu: 0-...!: (10499 ticks this GP) idle=c66/1/0x4000000000000002 softirq=9734/9734 fqs=0 [ 194.279885][ C0] (t=10501 jiffies g=8717 q=86) [ 194.284811][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g8717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 194.295889][ C0] rcu: RCU grace-period kthread stack dump: [ 194.301761][ C0] rcu_preempt R running task 29520 10 2 0x80004000 [ 194.309649][ C0] Call Trace: [ 194.312938][ C0] __schedule+0x755/0x1580 [ 194.317348][ C0] ? __sched_text_start+0x8/0x8 [ 194.322192][ C0] schedule+0xd9/0x260 [ 194.326249][ C0] schedule_timeout+0x486/0xc50 [ 194.331084][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 194.336008][ C0] ? usleep_range+0x170/0x170 [ 194.340672][ C0] ? trace_hardirqs_on+0x67/0x240 [ 194.345682][ C0] ? __kasan_check_read+0x11/0x20 [ 194.350699][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 194.356234][ C0] ? swake_up_one+0x60/0x60 [ 194.360721][ C0] ? trace_hardirqs_on+0x67/0x240 [ 194.365736][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 194.370496][ C0] ? rcu_barrier+0x310/0x310 [ 194.375073][ C0] ? trace_hardirqs_on+0x67/0x240 [ 194.380082][ C0] ? __kasan_check_read+0x11/0x20 [ 194.385098][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 194.391326][ C0] ? __kthread_parkme+0x108/0x1c0 [ 194.396335][ C0] ? __kasan_check_read+0x11/0x20 [ 194.401346][ C0] kthread+0x361/0x430 [ 194.405402][ C0] ? rcu_barrier+0x310/0x310 [ 194.409983][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 194.416213][ C0] ret_from_fork+0x24/0x30 [ 194.420620][ C0] NMI backtrace for cpu 0 [ 194.424943][ C0] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc8+ #0 [ 194.432292][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 194.442346][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 194.448313][ C0] Call Trace: [ 194.451582][ C0] [ 194.454427][ C0] dump_stack+0x172/0x1f0 [ 194.458746][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 194.463931][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 194.470163][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 194.475785][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 194.481754][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 194.487633][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 194.492734][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 194.498266][ C0] ? raise_softirq+0x138/0x340 [ 194.503019][ C0] update_process_times+0x32/0x80 [ 194.508030][ C0] tick_sched_handle+0xa2/0x190 [ 194.512868][ C0] tick_sched_timer+0x53/0x140 [ 194.517621][ C0] __hrtimer_run_queues+0x364/0xe40 [ 194.522808][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 194.528083][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 194.533614][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 194.539321][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 194.545379][ C0] hrtimer_interrupt+0x314/0x770 [ 194.550315][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 194.555849][ C0] apic_timer_interrupt+0xf/0x20 [ 194.560775][ C0] RIP: 0010:native_queued_spin_lock_slowpath+0x132/0x9f0 [ 194.567794][ C0] Code: 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 37 07 00 00 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f3 90 73 ff ff ff 8b 45 98 4c 8d 65 d8 3d 00 01 00 00 0f 84 e5 00 00 [ 194.587383][ C0] RSP: 0018:ffff8880ae808ab0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 194.595788][ C0] RAX: 0000000000000000 RBX: ffff8880a8ed57a8 RCX: ffffffff81595c17 [ 194.603750][ C0] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880a8ed57a8 [ 194.611709][ C0] RBP: ffff8880ae808b70 R08: 1ffff110151daaf5 R09: ffffed10151daaf6 [ 194.619667][ C0] R10: ffffed10151daaf5 R11: ffff8880a8ed57ab R12: 0000000000000001 [ 194.627624][ C0] R13: 0000000000000003 R14: ffffed10151daaf5 R15: 0000000000000001 [ 194.635592][ C0] ? apic_timer_interrupt+0xa/0x20 [ 194.640693][ C0] ? native_queued_spin_lock_slowpath+0xb7/0x9f0 [ 194.647010][ C0] ? stack_trace_save+0xac/0xe0 [ 194.651851][ C0] ? __pv_queued_spin_lock_slowpath+0xd10/0xd10 [ 194.658084][ C0] ? mark_held_locks+0xf0/0xf0 [ 194.662926][ C0] ? mark_held_locks+0xf0/0xf0 [ 194.667682][ C0] do_raw_spin_lock+0x20e/0x2e0 [ 194.672519][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 194.677445][ C0] ? lock_acquire+0x190/0x410 [ 194.682111][ C0] ? __dev_queue_xmit+0x14b8/0x3650 [ 194.687297][ C0] ? __dev_queue_xmit+0x20a/0x3650 [ 194.692402][ C0] _raw_spin_lock+0x37/0x40 [ 194.696891][ C0] ? __dev_queue_xmit+0x14b8/0x3650 [ 194.702074][ C0] __dev_queue_xmit+0x14b8/0x3650 [ 194.707085][ C0] ? process_backlog+0x206/0x750 [ 194.712010][ C0] ? net_rx_action+0x4d6/0x1030 [ 194.716848][ C0] ? __do_softirq+0x262/0x98c [ 194.721513][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 194.726697][ C0] ? do_softirq.part.0+0x11a/0x170 [ 194.731806][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 194.737101][ C0] ? quarantine_put+0x11c/0x1c0 [ 194.741941][ C0] ? trace_hardirqs_on+0x67/0x240 [ 194.746956][ C0] ? __skb_ext_put+0xd9/0x210 [ 194.751625][ C0] dev_queue_xmit+0x18/0x20 [ 194.756115][ C0] ? dev_queue_xmit+0x18/0x20 [ 194.760782][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 194.766140][ C0] ? __skb_ext_del+0xb0/0x2c0 [ 194.770806][ C0] ? lock_downgrade+0x920/0x920 [ 194.775659][ C0] br_nf_dev_queue_xmit+0x34e/0x1470 [ 194.780936][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 194.786644][ C0] br_nf_post_routing+0x1502/0x1d30 [ 194.791838][ C0] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 194.797372][ C0] ? mark_held_locks+0xf0/0xf0 [ 194.802129][ C0] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 194.807921][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 194.813719][ C0] nf_hook_slow+0xbc/0x1e0 [ 194.818123][ C0] br_forward_finish+0x215/0x400 [ 194.823049][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 194.828584][ C0] ? process_one_work+0x9af/0x1740 [ 194.833682][ C0] ? worker_thread+0x98/0xe40 [ 194.838346][ C0] ? kthread+0x361/0x430 [ 194.842575][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 194.847332][ C0] ? ip_vs_out+0x244/0x1700 [ 194.851827][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 194.857532][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 194.862113][ C0] ? should_fail+0x1de/0x852 [ 194.866694][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 194.871623][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 194.877167][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 194.882282][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 194.887812][ C0] ? br_nf_forward_finish+0x176/0xa90 [ 194.893173][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 194.899055][ C0] br_nf_forward_finish+0x66c/0xa90 [ 194.904239][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 194.909772][ C0] br_nf_forward_ip+0xc74/0x21e0 [ 194.914702][ C0] ? br_nf_forward_arp+0x1670/0x1670 [ 194.919973][ C0] ? mark_held_locks+0xf0/0xf0 [ 194.924727][ C0] ? br_nf_hook_thresh+0x370/0x370 [ 194.929826][ C0] ? __vlan_flush+0x120/0x120 [ 194.934493][ C0] nf_hook_slow+0xbc/0x1e0 [ 194.938898][ C0] __br_forward+0x393/0xb00 [ 194.943393][ C0] ? br_forward_finish+0x400/0x400 [ 194.948495][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 194.954033][ C0] deliver_clone+0x61/0xc0 [ 194.958439][ C0] br_flood+0x325/0x3d0 [ 194.962587][ C0] br_handle_frame_finish+0xb46/0x1670 [ 194.968038][ C0] ? br_handle_local_finish+0x20/0x20 [ 194.973397][ C0] ? audit_alloc_mark+0x420/0x500 [ 194.978413][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 194.984124][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 194.988723][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 194.993662][ C0] ? br_handle_local_finish+0x20/0x20 [ 194.999030][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 195.004139][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 195.010375][ C0] ? br_handle_local_finish+0x20/0x20 [ 195.015742][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 195.021630][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 195.027514][ C0] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 195.033486][ C0] ? br_handle_local_finish+0x20/0x20 [ 195.038853][ C0] br_nf_pre_routing_ipv6+0x456/0x832 [ 195.044219][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 195.049234][ C0] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 195.055382][ C0] ? br_nf_pre_routing+0x246/0x2355 [ 195.060575][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 195.066805][ C0] ? skb_pull_rcsum+0x155/0x300 [ 195.071645][ C0] br_nf_pre_routing+0x1743/0x2355 [ 195.076748][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 195.082636][ C0] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 195.088517][ C0] br_handle_frame+0x806/0x133e [ 195.093366][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 195.099089][ C0] ? kfree_skb+0x10e/0x3c0 [ 195.103501][ C0] ? br_handle_local_finish+0x20/0x20 [ 195.108866][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 195.115095][ C0] ? br_handle_frame_finish+0x1670/0x1670 [ 195.120805][ C0] __netif_receive_skb_core+0xfc1/0x3060 [ 195.126439][ C0] ? do_xdp_generic+0x50/0x50 [ 195.131108][ C0] ? ipv6_rcv+0x116/0x420 [ 195.135428][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 195.140879][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 195.146768][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 195.152567][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 195.158534][ C0] ? __kasan_check_write+0x14/0x20 [ 195.163637][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 195.169519][ C0] ? lock_acquire+0x190/0x410 [ 195.174183][ C0] ? process_backlog+0x195/0x750 [ 195.179112][ C0] __netif_receive_skb+0x2c/0x1d0 [ 195.184128][ C0] process_backlog+0x206/0x750 [ 195.188878][ C0] ? rebalance_domains+0x2c6/0xba0 [ 195.193977][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 195.200208][ C0] net_rx_action+0x4d6/0x1030 [ 195.204878][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 195.210063][ C0] ? sched_clock+0x2e/0x50 [ 195.214470][ C0] ? ip6_finish_output2+0x106d/0x2520 [ 195.219832][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 195.226063][ C0] __do_softirq+0x262/0x98c [ 195.230557][ C0] ? ip6_finish_output2+0x106d/0x2520 [ 195.235917][ C0] do_softirq_own_stack+0x2a/0x40 [ 195.240924][ C0] [ 195.243854][ C0] do_softirq.part.0+0x11a/0x170 [ 195.248790][ C0] __local_bh_enable_ip+0x211/0x270 [ 195.253978][ C0] ip6_finish_output2+0x10a0/0x2520 [ 195.259167][ C0] ? ip6_forward_finish+0x530/0x530 [ 195.264353][ C0] ? lock_downgrade+0x920/0x920 [ 195.269191][ C0] ? ip6_mtu+0x16f/0x460 [ 195.273424][ C0] __ip6_finish_output+0x444/0xa50 [ 195.278530][ C0] ? __ip6_finish_output+0x444/0xa50 [ 195.285454][ C0] ip6_finish_output+0x38/0x1f0 [ 195.290291][ C0] ip6_output+0x235/0x7c0 [ 195.294609][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 195.299712][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 195.304985][ C0] ? ndisc_send_skb+0x803/0x1450 [ 195.309920][ C0] ndisc_send_skb+0xf29/0x1450 [ 195.314684][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 195.319961][ C0] ? skb_set_owner_w+0x21b/0x320 [ 195.324886][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 195.330595][ C0] ndisc_send_ns+0x3a9/0x850 [ 195.335176][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 195.341406][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 195.346594][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 195.351780][ C0] ? trace_hardirqs_on+0x67/0x240 [ 195.356796][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 195.361990][ C0] addrconf_dad_work+0xb88/0x1150 [ 195.367008][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 195.372541][ C0] ? lock_acquire+0x190/0x410 [ 195.377206][ C0] ? trace_hardirqs_on+0x67/0x240 [ 195.382221][ C0] process_one_work+0x9af/0x1740 [ 195.387151][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 195.392506][ C0] ? lock_acquire+0x190/0x410 [ 195.397177][ C0] worker_thread+0x98/0xe40 [ 195.401666][ C0] ? trace_hardirqs_on+0x67/0x240 [ 195.406683][ C0] kthread+0x361/0x430 [ 195.410739][ C0] ? process_one_work+0x1740/0x1740 [ 195.415923][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 195.422154][ C0] ret_from_fork+0x24/0x30