[....] 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. [ 63.225577][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 63.225587][ T26] audit: type=1800 audit(1568482485.163:29): pid=9592 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 [ 63.252240][ T26] audit: type=1800 audit(1568482485.163:30): pid=9592 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 '10.128.0.230' (ECDSA) to the list of known hosts. syzkaller login: [ 69.832013][ T9742] IPVS: ftp: loaded support on port[0] = 21 [ 69.875104][ T9742] chnl_net:caif_netlink_parms(): no params data found [ 69.896505][ T9742] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.904107][ T9742] bridge0: port 1(bridge_slave_0) entered disabled state [ 69.912137][ T9742] device bridge_slave_0 entered promiscuous mode [ 69.919550][ T9742] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.926632][ T9742] bridge0: port 2(bridge_slave_1) entered disabled state [ 69.934520][ T9742] device bridge_slave_1 entered promiscuous mode [ 69.947721][ T9742] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 69.958229][ T9742] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 69.974119][ T9742] team0: Port device team_slave_0 added [ 69.980926][ T9742] team0: Port device team_slave_1 added [ 70.030931][ T9742] device hsr_slave_0 entered promiscuous mode [ 70.069468][ T9742] device hsr_slave_1 entered promiscuous mode [ 70.115133][ T9742] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.122334][ T9742] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.129743][ T9742] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.136777][ T9742] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.160489][ T9742] 8021q: adding VLAN 0 to HW filter on device bond0 [ 70.170650][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.188785][ T3014] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.196767][ T3014] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.205026][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 70.214679][ T9742] 8021q: adding VLAN 0 to HW filter on device team0 [ 70.223790][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 70.232329][ T3516] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.239536][ T3516] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.258730][ T9742] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 70.269276][ T9742] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 70.281022][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 70.289992][ T3014] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.297186][ T3014] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.305850][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 70.314587][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 70.322925][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 70.331066][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 70.339221][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 70.346803][ T3014] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 70.359993][ T9742] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 175.389098][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 175.395851][ C1] rcu: 1-...!: (1 GPs behind) idle=c7a/0/0x3 softirq=10181/10182 fqs=8 [ 175.404238][ C1] (t=10501 jiffies g=8969 q=157) [ 175.409248][ C1] rcu: rcu_preempt kthread starved for 10486 jiffies! g8969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 175.420495][ C1] rcu: RCU grace-period kthread stack dump: [ 175.426366][ C1] rcu_preempt I29520 10 2 0x80004000 [ 175.432690][ C1] Call Trace: [ 175.435972][ C1] __schedule+0x755/0x1580 [ 175.440382][ C1] ? __sched_text_start+0x8/0x8 [ 175.446170][ C1] schedule+0xd9/0x260 [ 175.450216][ C1] schedule_timeout+0x486/0xc50 [ 175.455046][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 175.460930][ C1] ? usleep_range+0x170/0x170 [ 175.465584][ C1] ? trace_hardirqs_on+0x67/0x240 [ 175.470595][ C1] ? __kasan_check_read+0x11/0x20 [ 175.475603][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 175.481125][ C1] ? swake_up_one+0x60/0x60 [ 175.485620][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 175.490365][ C1] ? rcu_barrier+0x310/0x310 [ 175.494933][ C1] ? trace_hardirqs_on+0x67/0x240 [ 175.499955][ C1] ? __kasan_check_read+0x11/0x20 [ 175.504966][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 175.511197][ C1] ? __kthread_parkme+0x108/0x1c0 [ 175.516198][ C1] ? __kasan_check_read+0x11/0x20 [ 175.521210][ C1] kthread+0x361/0x430 [ 175.525268][ C1] ? rcu_barrier+0x310/0x310 [ 175.529844][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 175.536073][ C1] ret_from_fork+0x24/0x30 [ 175.540496][ C1] NMI backtrace for cpu 1 [ 175.544805][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc8+ #0 [ 175.552668][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 175.563155][ C1] Call Trace: [ 175.566419][ C1] [ 175.569252][ C1] dump_stack+0x172/0x1f0 [ 175.573565][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 175.578763][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 175.584988][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 175.590600][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 175.596560][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 175.602453][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 175.607548][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 175.613088][ C1] ? raise_softirq+0x138/0x340 [ 175.617836][ C1] update_process_times+0x32/0x80 [ 175.622841][ C1] tick_sched_handle+0xa2/0x190 [ 175.627672][ C1] tick_sched_timer+0x53/0x140 [ 175.632419][ C1] __hrtimer_run_queues+0x364/0xe40 [ 175.637598][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 175.642868][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 175.648408][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 175.654117][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 175.660165][ C1] hrtimer_interrupt+0x314/0x770 [ 175.665089][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 175.670633][ C1] apic_timer_interrupt+0xf/0x20 [ 175.675569][ C1] RIP: 0010:hhf_dequeue+0x599/0xa20 [ 175.680754][ C1] Code: d0 7c 08 84 d2 0f 85 b5 03 00 00 45 8b b5 ac 03 00 00 e8 fa 04 ac fb 49 8d bd 14 03 00 00 48 89 f8 48 c1 e8 03 42 0f b6 14 20 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 3f 04 00 00 45 [ 175.700365][ C1] RSP: 0018:ffff8880ae909538 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13 [ 175.708764][ C1] RAX: 1ffff11013f0006a RBX: ffff88809f800338 RCX: ffffffff85c66b39 [ 175.716739][ C1] RDX: 0000000000000000 RSI: ffffffff85c67006 RDI: ffff88809f800354 [ 175.724705][ C1] RBP: ffff8880ae909588 R08: ffff8880a98c6340 R09: 0000000000000000 [ 175.732657][ C1] R10: fffffbfff134afaf R11: ffff8880a98c6340 R12: dffffc0000000000 [ 175.740607][ C1] R13: ffff88809f800040 R14: 0000000000000002 R15: 0000000000000000 [ 175.748576][ C1] ? apic_timer_interrupt+0xa/0x20 [ 175.753679][ C1] ? hhf_dequeue+0xb9/0xa20 [ 175.758170][ C1] ? hhf_dequeue+0x586/0xa20 [ 175.762742][ C1] ? hhf_dequeue+0x586/0xa20 [ 175.767336][ C1] __qdisc_run+0x1e7/0x19d0 [ 175.771822][ C1] ? dev_queue_xmit+0x18/0x20 [ 175.776482][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 175.781490][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 175.786584][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 175.791854][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 175.797207][ C1] ? __kasan_check_read+0x11/0x20 [ 175.802214][ C1] ? lock_downgrade+0x920/0x920 [ 175.807049][ C1] dev_queue_xmit+0x18/0x20 [ 175.811629][ C1] ? dev_queue_xmit+0x18/0x20 [ 175.816284][ C1] neigh_resolve_output+0x5a5/0x970 [ 175.821483][ C1] ip6_finish_output2+0x1034/0x2520 [ 175.826660][ C1] ? ip6_mtu+0x2e6/0x460 [ 175.830882][ C1] ? ip6_forward_finish+0x530/0x530 [ 175.836057][ C1] ? ip6_mtu+0x16f/0x460 [ 175.840281][ C1] __ip6_finish_output+0x444/0xa50 [ 175.845367][ C1] ? __ip6_finish_output+0x444/0xa50 [ 175.850647][ C1] ip6_finish_output+0x38/0x1f0 [ 175.855475][ C1] ip6_output+0x235/0x7c0 [ 175.859785][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 175.864875][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 175.870155][ C1] ? icmp6_dst_alloc+0x432/0x660 [ 175.875086][ C1] mld_sendpack+0x9c7/0xea0 [ 175.879582][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 175.884870][ C1] ? mld_ifc_timer_expire+0x437/0x8a0 [ 175.890229][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 175.895585][ C1] mld_ifc_timer_expire+0x449/0x8a0 [ 175.900770][ C1] call_timer_fn+0x1ac/0x780 [ 175.905344][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 175.910696][ C1] ? msleep_interruptible+0x150/0x150 [ 175.916049][ C1] ? trace_hardirqs_on+0x67/0x240 [ 175.921051][ C1] ? __kasan_check_read+0x11/0x20 [ 175.926056][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 175.931415][ C1] ? mld_dad_timer_expire+0x1c0/0x1c0 [ 175.936779][ C1] run_timer_softirq+0x697/0x17a0 [ 175.941786][ C1] ? add_timer+0x930/0x930 [ 175.946181][ C1] ? kvm_clock_read+0x18/0x30 [ 175.950844][ C1] ? kvm_sched_clock_read+0x9/0x20 [ 175.955954][ C1] ? sched_clock+0x2e/0x50 [ 175.960355][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 175.965190][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 175.971409][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 175.977718][ C1] __do_softirq+0x262/0x98c [ 175.982207][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 175.987051][ C1] irq_exit+0x19b/0x1e0 [ 175.991214][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 175.996738][ C1] apic_timer_interrupt+0xf/0x20 [ 176.001663][ C1] [ 176.004596][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 176.009980][ 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 [ 176.029723][ C1] RSP: 0018:ffff8880a98dfd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 176.038118][ C1] RAX: 1ffffffff11a5e8d RBX: ffff8880a98c6340 RCX: 1ffffffff134b5ee [ 176.046070][ C1] RDX: dffffc0000000000 RSI: ffffffff8177f15e RDI: ffffffff873e150c [ 176.054030][ C1] RBP: ffff8880a98dfd98 R08: ffff8880a98c6340 R09: ffffed1015318c69 [ 176.061992][ C1] R10: ffffed1015318c68 R11: ffff8880a98c6347 R12: dffffc0000000000 [ 176.069954][ C1] R13: ffffffff89a57d78 R14: 0000000000000000 R15: 0000000000000001 [ 176.077946][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 176.082962][ C1] ? default_idle+0x1c/0x360 [ 176.087535][ C1] ? default_idle+0x4e/0x360 [ 176.092109][ C1] arch_cpu_idle+0xa/0x10 [ 176.096417][ C1] default_idle_call+0x84/0xb0 [ 176.101161][ C1] do_idle+0x413/0x760 [ 176.105224][ C1] ? __this_cpu_preempt_check+0x3a/0x210 [ 176.110839][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 176.115900][ C1] cpu_startup_entry+0x1b/0x20 [ 176.120666][ C1] start_secondary+0x315/0x430 [ 176.125420][ C1] ? set_cpu_sibling_map+0x2180/0x2180 [ 176.130875][ C1] secondary_startup_64+0xa4/0xb0