[....] 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. [ 65.162118][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 65.162130][ T26] audit: type=1800 audit(1568465552.006:29): pid=9659 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 [ 65.198676][ T26] audit: type=1800 audit(1568465552.006:30): pid=9659 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 '10.128.0.168' (ECDSA) to the list of known hosts. syzkaller login: [ 160.752798][ T9812] IPVS: ftp: loaded support on port[0] = 21 [ 160.796839][ T9812] chnl_net:caif_netlink_parms(): no params data found [ 160.818559][ T9812] bridge0: port 1(bridge_slave_0) entered blocking state [ 160.826229][ T9812] bridge0: port 1(bridge_slave_0) entered disabled state [ 160.833746][ T9812] device bridge_slave_0 entered promiscuous mode [ 160.840982][ T9812] bridge0: port 2(bridge_slave_1) entered blocking state [ 160.848100][ T9812] bridge0: port 2(bridge_slave_1) entered disabled state [ 160.855662][ T9812] device bridge_slave_1 entered promiscuous mode [ 160.869092][ T9812] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 160.879492][ T9812] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 160.895620][ T9812] team0: Port device team_slave_0 added [ 160.901978][ T9812] team0: Port device team_slave_1 added [ 160.983937][ T9812] device hsr_slave_0 entered promiscuous mode [ 161.052721][ T9812] device hsr_slave_1 entered promiscuous mode [ 161.127336][ T9812] bridge0: port 2(bridge_slave_1) entered blocking state [ 161.134449][ T9812] bridge0: port 2(bridge_slave_1) entered forwarding state [ 161.141706][ T9812] bridge0: port 1(bridge_slave_0) entered blocking state [ 161.148771][ T9812] bridge0: port 1(bridge_slave_0) entered forwarding state [ 161.171071][ T9812] 8021q: adding VLAN 0 to HW filter on device bond0 [ 161.184002][ T9814] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 161.192050][ T9814] bridge0: port 1(bridge_slave_0) entered disabled state [ 161.199820][ T9814] bridge0: port 2(bridge_slave_1) entered disabled state [ 161.207693][ T9814] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 161.218287][ T9812] 8021q: adding VLAN 0 to HW filter on device team0 [ 161.227602][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 161.235930][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 161.242996][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 161.252125][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 161.260791][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 161.267897][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 161.283373][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 161.291832][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 161.300709][ T2621] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 161.309969][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 161.320351][ T9812] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network executing program [ 161.331525][ T9812] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 161.339256][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 161.354629][ T9812] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 266.432272][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 266.439129][ C1] rcu: 1-...!: (1 GPs behind) idle=08e/0/0x3 softirq=9179/9179 fqs=14 [ 266.447440][ C1] (t=10500 jiffies g=9137 q=82) [ 266.452363][ C1] rcu: rcu_preempt kthread starved for 10472 jiffies! g9137 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 266.463625][ C1] rcu: RCU grace-period kthread stack dump: [ 266.469618][ C1] rcu_preempt I29520 10 2 0x80004000 [ 266.475949][ C1] Call Trace: [ 266.479334][ C1] __schedule+0x755/0x1580 [ 266.483737][ C1] ? __sched_text_start+0x8/0x8 [ 266.488580][ C1] schedule+0xd9/0x260 [ 266.493329][ C1] schedule_timeout+0x486/0xc50 [ 266.498165][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 266.503098][ C1] ? usleep_range+0x170/0x170 [ 266.507763][ C1] ? trace_hardirqs_on+0x67/0x240 [ 266.512782][ C1] ? __kasan_check_read+0x11/0x20 [ 266.517794][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 266.523332][ C1] ? swake_up_one+0x60/0x60 [ 266.527817][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 266.532561][ C1] ? rcu_barrier+0x310/0x310 [ 266.537127][ C1] ? trace_hardirqs_on+0x67/0x240 [ 266.542138][ C1] ? __kasan_check_read+0x11/0x20 [ 266.547146][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 266.553364][ C1] ? __kthread_parkme+0x108/0x1c0 [ 266.558365][ C1] ? __kasan_check_read+0x11/0x20 [ 266.563374][ C1] kthread+0x361/0x430 [ 266.567419][ C1] ? rcu_barrier+0x310/0x310 [ 266.571988][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 266.578206][ C1] ret_from_fork+0x24/0x30 [ 266.582634][ C1] NMI backtrace for cpu 1 [ 266.586942][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc8+ #0 [ 266.594032][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 266.604071][ C1] Call Trace: [ 266.607334][ C1] [ 266.610319][ C1] dump_stack+0x172/0x1f0 [ 266.614630][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 266.619820][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 266.626039][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 266.631649][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 266.637619][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 266.643490][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 266.648582][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 266.654115][ C1] ? raise_softirq+0x138/0x340 [ 266.658861][ C1] update_process_times+0x32/0x80 [ 266.663863][ C1] tick_sched_handle+0xa2/0x190 [ 266.668704][ C1] tick_sched_timer+0x53/0x140 [ 266.673459][ C1] __hrtimer_run_queues+0x364/0xe40 [ 266.678634][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 266.683900][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 266.689426][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 266.695120][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 266.701163][ C1] hrtimer_interrupt+0x314/0x770 [ 266.706142][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 266.711667][ C1] apic_timer_interrupt+0xf/0x20 [ 266.716606][ C1] RIP: 0010:hhf_dequeue+0x630/0xa20 [ 266.721789][ C1] Code: 49 8d 7f 08 4c 8b 73 08 48 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 ac 03 00 00 4c 89 f2 4d 89 77 08 48 c1 ea 03 42 80 3c 22 00 <0f> 85 89 03 00 00 4d 89 3e e8 42 04 ac fb 4d 8d b5 98 03 00 00 4c [ 266.741378][ C1] RSP: 0018:ffff8880ae908f28 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 266.749770][ C1] RAX: 1ffff11012161e0f RBX: ffff888090b0f078 RCX: ffffffff85c67051 [ 266.757720][ C1] RDX: 1ffff11012161e22 RSI: ffffffff85c6705b RDI: ffff888090b0f118 [ 266.765667][ C1] RBP: ffff8880ae908f78 R08: ffff8880a98c6340 R09: 0000000000000000 [ 266.773615][ C1] R10: fffffbfff134afaf R11: ffff8880a98c6340 R12: dffffc0000000000 [ 266.781564][ C1] R13: ffff888090b0ed80 R14: ffff888090b0f110 R15: ffff888090b0f110 [ 266.789521][ C1] ? apic_timer_interrupt+0xa/0x20 [ 266.794789][ C1] ? hhf_dequeue+0x5d1/0xa20 [ 266.799366][ C1] ? hhf_dequeue+0x5db/0xa20 [ 266.803934][ C1] ? hhf_dequeue+0x5db/0xa20 [ 266.808560][ C1] __qdisc_run+0x1e7/0x19d0 [ 266.813152][ C1] ? dev_queue_xmit+0x18/0x20 [ 266.817819][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 266.822823][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 266.828175][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 266.833452][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 266.839715][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 266.844996][ C1] ? br_forward_finish+0x235/0x400 [ 266.850551][ C1] ? __kasan_check_read+0x11/0x20 [ 266.855563][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 266.860745][ C1] dev_queue_xmit+0x18/0x20 [ 266.865230][ C1] ? dev_queue_xmit+0x18/0x20 [ 266.869892][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 266.875352][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 266.879927][ C1] br_forward_finish+0xfa/0x400 [ 266.884762][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 266.890298][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 266.895046][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 266.900744][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 266.905314][ C1] __br_forward+0x641/0xb00 [ 266.909799][ C1] ? br_forward_finish+0x400/0x400 [ 266.914890][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 266.920424][ C1] deliver_clone+0x61/0xc0 [ 266.924829][ C1] maybe_deliver+0x2c7/0x390 [ 266.929397][ C1] br_flood+0x13a/0x3d0 [ 266.933587][ C1] br_dev_xmit+0x98c/0x15a0 [ 266.938070][ C1] ? br_poll_controller+0x10/0x10 [ 266.943071][ C1] ? netif_skb_features+0x6c2/0xb90 [ 266.948268][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 266.953533][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 266.959771][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 266.964949][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 266.971168][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 266.976258][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 266.982484][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 266.987488][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 266.992778][ C1] ? __ip6_finish_output+0x444/0xa50 [ 266.998042][ C1] ? __kasan_check_read+0x11/0x20 [ 267.003066][ C1] ? ipv6_chk_mcast_addr+0x315/0x6f0 [ 267.008328][ C1] ? lock_downgrade+0x920/0x920 [ 267.013158][ C1] ? lock_acquire+0x190/0x410 [ 267.017811][ C1] ? __ip6_finish_output+0x444/0xa50 [ 267.023072][ C1] dev_queue_xmit+0x18/0x20 [ 267.027550][ C1] ? dev_queue_xmit+0x18/0x20 [ 267.032205][ C1] ip6_finish_output2+0xf58/0x2520 [ 267.037298][ C1] ? ip6_forward_finish+0x530/0x530 [ 267.042514][ C1] ? ip6_mtu+0x16f/0x460 [ 267.046748][ C1] __ip6_finish_output+0x444/0xa50 [ 267.051837][ C1] ? __ip6_finish_output+0x444/0xa50 [ 267.057107][ C1] ip6_finish_output+0x38/0x1f0 [ 267.061935][ C1] ip6_output+0x235/0x7c0 [ 267.066254][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 267.071352][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 267.076614][ C1] ? icmp6_dst_alloc+0x432/0x660 [ 267.081531][ C1] mld_sendpack+0x9c7/0xea0 [ 267.086013][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 267.091278][ C1] ? mld_ifc_timer_expire+0x437/0x8a0 [ 267.096629][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 267.101979][ C1] mld_ifc_timer_expire+0x449/0x8a0 [ 267.107159][ C1] call_timer_fn+0x1ac/0x780 [ 267.111724][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 267.117071][ C1] ? msleep_interruptible+0x150/0x150 [ 267.122430][ C1] ? trace_hardirqs_on+0x67/0x240 [ 267.127435][ C1] ? __kasan_check_read+0x11/0x20 [ 267.132435][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 267.137782][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 267.143141][ C1] run_timer_softirq+0x697/0x17a0 [ 267.148146][ C1] ? add_timer+0x930/0x930 [ 267.152538][ C1] ? kvm_clock_read+0x18/0x30 [ 267.157191][ C1] ? kvm_sched_clock_read+0x9/0x20 [ 267.162278][ C1] ? sched_clock+0x2e/0x50 [ 267.166673][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 267.171505][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 267.177725][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 267.183963][ C1] __do_softirq+0x262/0x98c [ 267.188443][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 267.193272][ C1] irq_exit+0x19b/0x1e0 [ 267.197406][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 267.202937][ C1] apic_timer_interrupt+0xf/0x20 [ 267.207847][ C1] [ 267.210764][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 267.216116][ C1] Code: 88 63 6e fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 24 0b 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 14 0b 4a 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 2e 23 22 fa e8 f9 [ 267.235694][ C1] RSP: 0018:ffff8880a98dfd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 267.244085][ C1] RAX: 1ffffffff11a5e8d RBX: ffff8880a98c6340 RCX: 1ffffffff134b5ee [ 267.252032][ C1] RDX: dffffc0000000000 RSI: ffffffff8177f15e RDI: ffffffff873e150c [ 267.259992][ C1] RBP: ffff8880a98dfd98 R08: ffff8880a98c6340 R09: ffffed1015318c69 [ 267.267951][ C1] R10: ffffed1015318c68 R11: ffff8880a98c6347 R12: dffffc0000000000 [ 267.275910][ C1] R13: ffffffff89a57d78 R14: 0000000000000000 R15: 0000000000000001 [ 267.283886][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 267.288897][ C1] ? default_idle+0x1c/0x360 [ 267.293481][ C1] ? default_idle+0x4e/0x360 [ 267.298051][ C1] arch_cpu_idle+0xa/0x10 [ 267.302360][ C1] default_idle_call+0x84/0xb0 [ 267.307243][ C1] do_idle+0x413/0x760 [ 267.311303][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 267.316312][ C1] cpu_startup_entry+0x1b/0x20 [ 267.321057][ C1] start_secondary+0x315/0x430 [ 267.325799][ C1] ? set_cpu_sibling_map+0x2180/0x2180 [ 267.331244][ C1] secondary_startup_64+0xa4/0xb0