[....] 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. [ 64.584968][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.584978][ T26] audit: type=1800 audit(1568428252.410:29): pid=9680 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 [ 64.619145][ T26] audit: type=1800 audit(1568428252.410:30): pid=9680 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 '10.128.1.14' (ECDSA) to the list of known hosts. syzkaller login: [ 198.919604][ T9833] IPVS: ftp: loaded support on port[0] = 21 [ 198.966445][ T9833] chnl_net:caif_netlink_parms(): no params data found [ 198.988608][ T9833] bridge0: port 1(bridge_slave_0) entered blocking state [ 198.996105][ T9833] bridge0: port 1(bridge_slave_0) entered disabled state [ 199.003773][ T9833] device bridge_slave_0 entered promiscuous mode [ 199.010942][ T9833] bridge0: port 2(bridge_slave_1) entered blocking state [ 199.018294][ T9833] bridge0: port 2(bridge_slave_1) entered disabled state [ 199.026387][ T9833] device bridge_slave_1 entered promiscuous mode [ 199.039680][ T9833] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 199.050644][ T9833] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 199.066342][ T9833] team0: Port device team_slave_0 added [ 199.072718][ T9833] team0: Port device team_slave_1 added [ 199.134928][ T9833] device hsr_slave_0 entered promiscuous mode [ 199.173645][ T9833] device hsr_slave_1 entered promiscuous mode [ 199.218568][ T9833] bridge0: port 2(bridge_slave_1) entered blocking state [ 199.225890][ T9833] bridge0: port 2(bridge_slave_1) entered forwarding state [ 199.233146][ T9833] bridge0: port 1(bridge_slave_0) entered blocking state [ 199.240219][ T9833] bridge0: port 1(bridge_slave_0) entered forwarding state [ 199.264375][ T9833] 8021q: adding VLAN 0 to HW filter on device bond0 [ 199.274401][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 199.292586][ T3013] bridge0: port 1(bridge_slave_0) entered disabled state [ 199.300272][ T3013] bridge0: port 2(bridge_slave_1) entered disabled state [ 199.308284][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 199.318286][ T9833] 8021q: adding VLAN 0 to HW filter on device team0 [ 199.327451][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 199.336043][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 199.343183][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 199.352484][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 199.361378][ T3013] bridge0: port 2(bridge_slave_1) entered blocking state [ 199.368616][ T3013] bridge0: port 2(bridge_slave_1) entered forwarding state [ 199.382004][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 199.390560][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 199.400449][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 199.411036][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 199.421296][ T3013] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 199.431374][ T9833] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 199.447151][ T9833] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 304.483303][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 304.489960][ C1] rcu: 1-...!: (10500 ticks this GP) idle=bda/0/0x3 softirq=10372/10372 fqs=0 [ 304.498954][ C1] (t=10501 jiffies g=9097 q=90) [ 304.503872][ C1] rcu: rcu_preempt kthread starved for 10502 jiffies! g9097 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 304.515211][ C1] rcu: RCU grace-period kthread stack dump: [ 304.521080][ C1] rcu_preempt I29520 10 2 0x80004000 [ 304.527506][ C1] Call Trace: [ 304.530881][ C1] __schedule+0x755/0x1580 [ 304.535286][ C1] ? __sched_text_start+0x8/0x8 [ 304.540133][ C1] schedule+0xd9/0x260 [ 304.544269][ C1] schedule_timeout+0x486/0xc50 [ 304.549102][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 304.554017][ C1] ? usleep_range+0x170/0x170 [ 304.558674][ C1] ? trace_hardirqs_on+0x67/0x240 [ 304.563866][ C1] ? __kasan_check_read+0x11/0x20 [ 304.568873][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 304.574427][ C1] ? swake_up_one+0x60/0x60 [ 304.578908][ C1] ? trace_hardirqs_on+0x67/0x240 [ 304.583942][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 304.588689][ C1] ? rcu_barrier+0x310/0x310 [ 304.593256][ C1] ? trace_hardirqs_on+0x67/0x240 [ 304.598260][ C1] ? __kasan_check_read+0x11/0x20 [ 304.603269][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 304.609489][ C1] ? __kthread_parkme+0x108/0x1c0 [ 304.614592][ C1] ? __kasan_check_read+0x11/0x20 [ 304.620638][ C1] kthread+0x361/0x430 [ 304.624705][ C1] ? rcu_barrier+0x310/0x310 [ 304.629277][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 304.635584][ C1] ret_from_fork+0x24/0x30 [ 304.640007][ C1] NMI backtrace for cpu 1 [ 304.644344][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc8+ #0 [ 304.651426][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 304.661469][ C1] Call Trace: [ 304.664846][ C1] [ 304.667735][ C1] dump_stack+0x172/0x1f0 [ 304.672051][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 304.677241][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 304.683465][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 304.689102][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 304.695064][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 304.701202][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 304.706295][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 304.711821][ C1] ? raise_softirq+0x138/0x340 [ 304.716571][ C1] update_process_times+0x32/0x80 [ 304.721599][ C1] tick_sched_handle+0xa2/0x190 [ 304.726431][ C1] tick_sched_timer+0x53/0x140 [ 304.731198][ C1] __hrtimer_run_queues+0x364/0xe40 [ 304.736388][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 304.741668][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 304.747195][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 304.752892][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 304.758953][ C1] hrtimer_interrupt+0x314/0x770 [ 304.763917][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 304.769442][ C1] apic_timer_interrupt+0xf/0x20 [ 304.774360][ C1] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xa/0x20 [ 304.781125][ C1] Code: 55 0f b7 d6 0f b7 f7 bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 d8 fe ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 <48> 89 e5 48 8b 4d 08 e8 ba fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 [ 304.800818][ C1] RSP: 0018:ffff8880ae908f18 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 304.809221][ C1] RAX: 0000000000000000 RBX: ffff888089e01078 RCX: ffffffff85c670f9 [ 304.817446][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 304.825395][ C1] RBP: ffff8880ae908f78 R08: ffff8880a98c6340 R09: 0000000000000000 [ 304.833347][ C1] R10: fffffbfff134afaf R11: ffff8880a98c6340 R12: dffffc0000000000 [ 304.841310][ C1] R13: ffff888089e00d80 R14: ffff888089e01110 R15: 0000000000000000 [ 304.849272][ C1] ? apic_timer_interrupt+0xa/0x20 [ 304.854443][ C1] ? hhf_dequeue+0x679/0xa20 [ 304.859040][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 304.865288][ C1] ? hhf_dequeue+0xb9/0xa20 [ 304.869896][ C1] __qdisc_run+0x1e7/0x19d0 [ 304.874408][ C1] ? dev_queue_xmit+0x18/0x20 [ 304.879066][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 304.884070][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 304.889530][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 304.894814][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 304.901680][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 304.906999][ C1] ? br_forward_finish+0x235/0x400 [ 304.912089][ C1] ? __kasan_check_read+0x11/0x20 [ 304.917116][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 304.922419][ C1] dev_queue_xmit+0x18/0x20 [ 304.926904][ C1] ? dev_queue_xmit+0x18/0x20 [ 304.931576][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 304.937001][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 304.941658][ C1] br_forward_finish+0xfa/0x400 [ 304.946487][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 304.952012][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 304.956757][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 304.962454][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 304.967047][ C1] __br_forward+0x641/0xb00 [ 304.971528][ C1] ? br_forward_finish+0x400/0x400 [ 304.976619][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 304.982170][ C1] deliver_clone+0x61/0xc0 [ 304.986565][ C1] maybe_deliver+0x2c7/0x390 [ 304.991135][ C1] br_flood+0x13a/0x3d0 [ 304.995336][ C1] br_dev_xmit+0x98c/0x15a0 [ 304.999824][ C1] ? br_poll_controller+0x10/0x10 [ 305.005088][ C1] ? netif_skb_features+0x6c2/0xb90 [ 305.010291][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 305.015657][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 305.021948][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 305.027219][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 305.033457][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 305.038567][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 305.044788][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 305.049815][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 305.055131][ C1] ? __ip6_finish_output+0x444/0xa50 [ 305.060421][ C1] ? __kasan_check_read+0x11/0x20 [ 305.065507][ C1] ? ipv6_chk_mcast_addr+0x315/0x6f0 [ 305.070803][ C1] ? lock_downgrade+0x920/0x920 [ 305.075639][ C1] ? lock_acquire+0x190/0x410 [ 305.080302][ C1] ? __ip6_finish_output+0x444/0xa50 [ 305.085655][ C1] dev_queue_xmit+0x18/0x20 [ 305.090336][ C1] ? dev_queue_xmit+0x18/0x20 [ 305.095077][ C1] ip6_finish_output2+0xf58/0x2520 [ 305.100168][ C1] ? ip6_forward_finish+0x530/0x530 [ 305.105406][ C1] ? ip6_mtu+0x16f/0x460 [ 305.109632][ C1] __ip6_finish_output+0x444/0xa50 [ 305.114725][ C1] ? __ip6_finish_output+0x444/0xa50 [ 305.119995][ C1] ip6_finish_output+0x38/0x1f0 [ 305.124835][ C1] ip6_output+0x235/0x7c0 [ 305.129260][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 305.134360][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 305.139709][ C1] ? icmp6_dst_alloc+0x432/0x660 [ 305.145782][ C1] mld_sendpack+0x9c7/0xea0 [ 305.150266][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 305.155532][ C1] ? mld_ifc_timer_expire+0x437/0x8a0 [ 305.160889][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 305.166249][ C1] mld_ifc_timer_expire+0x449/0x8a0 [ 305.171429][ C1] call_timer_fn+0x1ac/0x780 [ 305.176001][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 305.181366][ C1] ? msleep_interruptible+0x150/0x150 [ 305.186717][ C1] ? trace_hardirqs_on+0x67/0x240 [ 305.191739][ C1] ? __kasan_check_read+0x11/0x20 [ 305.196744][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 305.202097][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 305.207454][ C1] run_timer_softirq+0x697/0x17a0 [ 305.212481][ C1] ? add_timer+0x930/0x930 [ 305.216888][ C1] ? kvm_clock_read+0x18/0x30 [ 305.221545][ C1] ? kvm_sched_clock_read+0x9/0x20 [ 305.226634][ C1] ? sched_clock+0x2e/0x50 [ 305.231029][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 305.235861][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 305.242082][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 305.248317][ C1] __do_softirq+0x262/0x98c [ 305.252806][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 305.257652][ C1] irq_exit+0x19b/0x1e0 [ 305.261788][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 305.267313][ C1] apic_timer_interrupt+0xf/0x20 [ 305.272239][ C1] [ 305.275169][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 305.280524][ 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 [ 305.300206][ C1] RSP: 0018:ffff8880a98dfd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 305.308595][ C1] RAX: 1ffffffff11a5e8d RBX: ffff8880a98c6340 RCX: 1ffffffff134b5ee [ 305.317169][ C1] RDX: dffffc0000000000 RSI: ffffffff8177f15e RDI: ffffffff873e150c [ 305.325155][ C1] RBP: ffff8880a98dfd98 R08: ffff8880a98c6340 R09: ffffed1015318c69 [ 305.333113][ C1] R10: ffffed1015318c68 R11: ffff8880a98c6347 R12: dffffc0000000000 [ 305.341064][ C1] R13: ffffffff89a57d78 R14: 0000000000000000 R15: 0000000000000001 [ 305.349029][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 305.354033][ C1] ? default_idle+0x1c/0x360 [ 305.358625][ C1] ? default_idle+0x4e/0x360 [ 305.363291][ C1] arch_cpu_idle+0xa/0x10 [ 305.367598][ C1] default_idle_call+0x84/0xb0 [ 305.372340][ C1] do_idle+0x413/0x760 [ 305.376390][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 305.381570][ C1] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 305.387353][ C1] ? complete+0x61/0x80 [ 305.391501][ C1] cpu_startup_entry+0x1b/0x20 [ 305.396244][ C1] start_secondary+0x315/0x430 [ 305.400988][ C1] ? set_cpu_sibling_map+0x2180/0x2180 [ 305.406433][ C1] secondary_startup_64+0xa4/0xb0