[....] 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. [ 64.638537][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.638547][ T26] audit: type=1800 audit(1568482018.340:29): pid=9631 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 [ 64.676155][ T26] audit: type=1800 audit(1568482018.350:30): pid=9631 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 '10.128.15.203' (ECDSA) to the list of known hosts. syzkaller login: [ 74.439241][ T9782] IPVS: ftp: loaded support on port[0] = 21 [ 74.480337][ T9782] chnl_net:caif_netlink_parms(): no params data found [ 74.501269][ T9782] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.508642][ T9782] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.516245][ T9782] device bridge_slave_0 entered promiscuous mode [ 74.523476][ T9782] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.530607][ T9782] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.538289][ T9782] device bridge_slave_1 entered promiscuous mode [ 74.551246][ T9782] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 74.561743][ T9782] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 74.577364][ T9782] team0: Port device team_slave_0 added [ 74.584227][ T9782] team0: Port device team_slave_1 added [ 74.663328][ T9782] device hsr_slave_0 entered promiscuous mode [ 74.742124][ T9782] device hsr_slave_1 entered promiscuous mode [ 74.797165][ T9782] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.804346][ T9782] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.811611][ T9782] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.818672][ T9782] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.842808][ T9782] 8021q: adding VLAN 0 to HW filter on device bond0 [ 74.852651][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 74.860549][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.868693][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.876893][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 74.886705][ T9782] 8021q: adding VLAN 0 to HW filter on device team0 [ 74.895449][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 74.903996][ T3516] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.911016][ T3516] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.922452][ T9784] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 74.930699][ T9784] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.937770][ T9784] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.949544][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 74.957864][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 74.967576][ T9784] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 74.980449][ T9782] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network executing program [ 74.991170][ T9782] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 75.002990][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.011301][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.019595][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 75.034326][ T9782] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 180.131805][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 180.138448][ C1] rcu: 1-...!: (1 GPs behind) idle=84e/1/0x4000000000000002 softirq=9500/9501 fqs=7 [ 180.147961][ C1] (t=10500 jiffies g=9053 q=83) [ 180.152877][ C1] rcu: rcu_preempt kthread starved for 10486 jiffies! g9053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 180.163957][ C1] rcu: RCU grace-period kthread stack dump: [ 180.169821][ C1] rcu_preempt R running task 29688 10 2 0x80004000 [ 180.177697][ C1] Call Trace: [ 180.180988][ C1] __schedule+0x755/0x1580 [ 180.185385][ C1] ? __sched_text_start+0x8/0x8 [ 180.190218][ C1] schedule+0xd9/0x260 [ 180.194267][ C1] schedule_timeout+0x486/0xc50 [ 180.199095][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 180.204009][ C1] ? usleep_range+0x170/0x170 [ 180.208660][ C1] ? trace_hardirqs_on+0x67/0x240 [ 180.213664][ C1] ? __kasan_check_read+0x11/0x20 [ 180.218678][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 180.224201][ C1] ? swake_up_one+0x60/0x60 [ 180.228683][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 180.233428][ C1] ? rcu_barrier+0x310/0x310 [ 180.237992][ C1] ? trace_hardirqs_on+0x67/0x240 [ 180.242995][ C1] ? __kasan_check_read+0x11/0x20 [ 180.247999][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 180.254301][ C1] ? __kthread_parkme+0x108/0x1c0 [ 180.259311][ C1] ? __kasan_check_read+0x11/0x20 [ 180.264312][ C1] kthread+0x361/0x430 [ 180.268361][ C1] ? rcu_barrier+0x310/0x310 [ 180.272927][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 180.279145][ C1] ret_from_fork+0x24/0x30 [ 180.283545][ C1] NMI backtrace for cpu 1 [ 180.287862][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc8+ #0 [ 180.295202][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 180.305238][ C1] Call Trace: [ 180.308498][ C1] [ 180.311332][ C1] dump_stack+0x172/0x1f0 [ 180.315640][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 180.320911][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 180.327148][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 180.332761][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 180.338717][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 180.344590][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 180.349680][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 180.355201][ C1] ? raise_softirq+0x138/0x340 [ 180.359947][ C1] update_process_times+0x32/0x80 [ 180.364949][ C1] tick_sched_handle+0xa2/0x190 [ 180.369778][ C1] tick_sched_timer+0x53/0x140 [ 180.374529][ C1] __hrtimer_run_queues+0x364/0xe40 [ 180.379707][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 180.384973][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 180.390495][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 180.396193][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 180.402236][ C1] hrtimer_interrupt+0x314/0x770 [ 180.407167][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 180.412689][ C1] apic_timer_interrupt+0xf/0x20 [ 180.417609][ C1] [ 180.420531][ C1] RIP: 0010:hhf_dequeue+0x5ed/0xa20 [ 180.425714][ C1] Code: 77 fd 31 ff 41 89 c6 89 c6 e8 ef 05 ac fb 45 84 f6 74 63 e8 a5 04 ac fb 48 89 d8 48 c1 e8 03 42 80 3c 20 00 0f 85 f3 03 00 00 <48> 8d 7b 08 4c 8b 3b 48 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 d0 [ 180.445298][ C1] RSP: 0018:ffff8880a990e9a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 180.453683][ C1] RAX: 1ffff1101224bb37 RBX: ffff88809125d9b8 RCX: ffffffff85c67051 [ 180.461641][ C1] RDX: 0000000000000100 RSI: ffffffff85c6705b RDI: 0000000000000001 [ 180.469602][ C1] RBP: ffff8880a990e9f8 R08: ffff8880a9900440 R09: 0000000000000000 [ 180.477561][ C1] R10: fffffbfff134afaf R11: ffff8880a9900440 R12: dffffc0000000000 [ 180.485513][ C1] R13: ffff88809125d6c0 R14: 0000000000000001 R15: 0000000000000000 [ 180.493490][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 180.498064][ C1] ? hhf_dequeue+0x5db/0xa20 [ 180.502739][ C1] ? hhf_dequeue+0x5db/0xa20 [ 180.507323][ C1] __qdisc_run+0x1e7/0x19d0 [ 180.511808][ C1] ? dev_queue_xmit+0x18/0x20 [ 180.516467][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 180.521473][ C1] ? process_backlog+0x206/0x750 [ 180.526386][ C1] ? net_rx_action+0x4d6/0x1030 [ 180.531219][ C1] ? __do_softirq+0x262/0x98c [ 180.535875][ C1] ? run_ksoftirqd+0x8e/0x110 [ 180.540529][ C1] ? smpboot_thread_fn+0x6a3/0xa40 [ 180.545623][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 180.550894][ C1] ? quarantine_put+0x11c/0x1c0 [ 180.555723][ C1] ? trace_hardirqs_on+0x67/0x240 [ 180.560732][ C1] ? __skb_ext_put+0xd9/0x210 [ 180.565393][ C1] dev_queue_xmit+0x18/0x20 [ 180.569880][ C1] ? dev_queue_xmit+0x18/0x20 [ 180.574547][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 180.579897][ C1] ? __skb_ext_del+0xb0/0x2c0 [ 180.584551][ C1] ? lock_downgrade+0x920/0x920 [ 180.589380][ C1] br_nf_dev_queue_xmit+0x34e/0x1470 [ 180.594644][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 180.600339][ C1] br_nf_post_routing+0x1502/0x1d30 [ 180.605535][ C1] ? br_nf_dev_queue_xmit+0x1470/0x1470 [ 180.611070][ C1] ? mark_held_locks+0xf0/0xf0 [ 180.615820][ C1] ? nf_bridge_update_protocol+0x1d0/0x1d0 [ 180.621620][ C1] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 180.627420][ C1] nf_hook_slow+0xbc/0x1e0 [ 180.631820][ C1] br_forward_finish+0x215/0x400 [ 180.636738][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 180.642262][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 180.647004][ C1] ? ip_vs_out+0x244/0x1700 [ 180.651488][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 180.657267][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 180.661839][ C1] ? should_fail+0x1de/0x852 [ 180.666408][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 180.671323][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 180.676847][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 180.681946][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 180.687465][ C1] ? br_nf_forward_finish+0x176/0xa90 [ 180.692851][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 180.698720][ C1] br_nf_forward_finish+0x66c/0xa90 [ 180.703896][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 180.709434][ C1] br_nf_forward_ip+0xc74/0x21e0 [ 180.714373][ C1] ? br_nf_forward_arp+0x1670/0x1670 [ 180.719654][ C1] ? mark_held_locks+0xf0/0xf0 [ 180.724408][ C1] ? br_nf_hook_thresh+0x370/0x370 [ 180.729503][ C1] ? __vlan_flush+0x120/0x120 [ 180.734168][ C1] nf_hook_slow+0xbc/0x1e0 [ 180.738573][ C1] __br_forward+0x393/0xb00 [ 180.743060][ C1] ? br_forward_finish+0x400/0x400 [ 180.748163][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 180.753695][ C1] deliver_clone+0x61/0xc0 [ 180.758097][ C1] br_flood+0x325/0x3d0 [ 180.762238][ C1] br_handle_frame_finish+0xb46/0x1670 [ 180.767680][ C1] ? br_handle_local_finish+0x20/0x20 [ 180.773039][ C1] ? audit_alloc_mark+0x420/0x500 [ 180.778043][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 180.783741][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 180.788309][ C1] br_nf_hook_thresh+0x2e9/0x370 [ 180.793226][ C1] ? br_handle_local_finish+0x20/0x20 [ 180.798574][ C1] ? setup_pre_routing+0x4b0/0x4b0 [ 180.804186][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 180.810404][ C1] ? br_handle_local_finish+0x20/0x20 [ 180.815755][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 180.821634][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 180.827505][ C1] br_nf_pre_routing_finish_ipv6+0x6fb/0xd80 [ 180.833473][ C1] ? br_handle_local_finish+0x20/0x20 [ 180.838832][ C1] br_nf_pre_routing_ipv6+0x456/0x832 [ 180.844185][ C1] ? br_validate_ipv6+0xb80/0xb80 [ 180.849192][ C1] ? br_nf_pre_routing_finish.cold+0x124/0x124 [ 180.855324][ C1] ? br_nf_pre_routing+0x246/0x2355 [ 180.860509][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 180.867512][ C1] ? skb_pull_rcsum+0x155/0x300 [ 180.872341][ C1] br_nf_pre_routing+0x1743/0x2355 [ 180.877438][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 180.883325][ C1] ? br_nf_pre_routing_finish+0x1730/0x1730 [ 180.889194][ C1] br_handle_frame+0x806/0x133e [ 180.894029][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 180.899726][ C1] ? kfree_skb+0x10e/0x3c0 [ 180.904123][ C1] ? br_handle_local_finish+0x20/0x20 [ 180.909563][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 180.915781][ C1] ? br_handle_frame_finish+0x1670/0x1670 [ 180.921478][ C1] __netif_receive_skb_core+0xfc1/0x3060 [ 180.927091][ C1] ? do_xdp_generic+0x50/0x50 [ 180.931746][ C1] ? ipv6_rcv+0x116/0x420 [ 180.936057][ C1] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 180.941496][ C1] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 180.947364][ C1] ? cpuacct_charge+0x1db/0x360 [ 180.952194][ C1] ? __kasan_check_read+0x11/0x20 [ 180.957199][ C1] __netif_receive_skb_one_core+0xa8/0x1a0 [ 180.962996][ C1] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 180.968966][ C1] ? __kasan_check_write+0x14/0x20 [ 180.974078][ C1] ? __netif_receive_skb_core+0x3060/0x3060 [ 180.979974][ C1] ? lock_acquire+0x190/0x410 [ 180.984640][ C1] ? process_backlog+0x195/0x750 [ 180.989561][ C1] __netif_receive_skb+0x2c/0x1d0 [ 180.994571][ C1] process_backlog+0x206/0x750 [ 180.999323][ C1] net_rx_action+0x4d6/0x1030 [ 181.004007][ C1] ? napi_complete_done+0x4b0/0x4b0 [ 181.009197][ C1] ? sched_clock+0x2e/0x50 [ 181.013602][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 181.019845][ C1] __do_softirq+0x262/0x98c [ 181.024602][ C1] ? takeover_tasklets+0x820/0x820 [ 181.029694][ C1] run_ksoftirqd+0x8e/0x110 [ 181.034183][ C1] smpboot_thread_fn+0x6a3/0xa40 [ 181.039105][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 181.045327][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 181.051547][ C1] ? __kthread_parkme+0x108/0x1c0 [ 181.056551][ C1] ? __kasan_check_read+0x11/0x20 [ 181.061553][ C1] kthread+0x361/0x430 [ 181.065602][ C1] ? smpboot_register_percpu_thread+0x390/0x390 [ 181.071832][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 181.078052][ C1] ret_from_fork+0x24/0x30