[....] 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. [ 61.950548][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 61.950559][ T26] audit: type=1800 audit(1568095017.254:29): pid=9675 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 [ 61.983424][ T26] audit: type=1800 audit(1568095017.254:30): pid=9675 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 '10.128.0.197' (ECDSA) to the list of known hosts. syzkaller login: [ 392.513542][ T9828] IPVS: ftp: loaded support on port[0] = 21 [ 392.558970][ T9828] chnl_net:caif_netlink_parms(): no params data found [ 392.581912][ T9828] bridge0: port 1(bridge_slave_0) entered blocking state [ 392.589227][ T9828] bridge0: port 1(bridge_slave_0) entered disabled state [ 392.596669][ T9828] device bridge_slave_0 entered promiscuous mode [ 392.603828][ T9828] bridge0: port 2(bridge_slave_1) entered blocking state [ 392.610925][ T9828] bridge0: port 2(bridge_slave_1) entered disabled state [ 392.618510][ T9828] device bridge_slave_1 entered promiscuous mode [ 392.632110][ T9828] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 392.642241][ T9828] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 392.657212][ T9828] team0: Port device team_slave_0 added [ 392.663979][ T9828] team0: Port device team_slave_1 added [ 392.721502][ T9828] device hsr_slave_0 entered promiscuous mode [ 392.759361][ T9828] device hsr_slave_1 entered promiscuous mode [ 392.833930][ T9828] bridge0: port 2(bridge_slave_1) entered blocking state [ 392.841032][ T9828] bridge0: port 2(bridge_slave_1) entered forwarding state [ 392.848319][ T9828] bridge0: port 1(bridge_slave_0) entered blocking state [ 392.855389][ T9828] bridge0: port 1(bridge_slave_0) entered forwarding state [ 392.878754][ T9828] 8021q: adding VLAN 0 to HW filter on device bond0 [ 392.888395][ T9830] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 392.907477][ T9830] bridge0: port 1(bridge_slave_0) entered disabled state [ 392.914848][ T9830] bridge0: port 2(bridge_slave_1) entered disabled state [ 392.922774][ T9830] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 392.933106][ T9828] 8021q: adding VLAN 0 to HW filter on device team0 [ 392.942269][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 392.950580][ T22] bridge0: port 1(bridge_slave_0) entered blocking state [ 392.957625][ T22] bridge0: port 1(bridge_slave_0) entered forwarding state [ 392.975415][ T9828] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 392.985957][ T9828] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 392.998009][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 393.006830][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 393.014035][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 393.022762][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 393.031155][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 393.039866][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 393.047956][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 393.056111][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 393.063592][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 393.078309][ T9828] 8021q: adding VLAN 0 to HW filter on device batadv0 executing program [ 498.119003][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 498.125656][ C0] rcu: 0-...!: (1 GPs behind) idle=12a/0/0x3 softirq=9636/9638 fqs=10 [ 498.133953][ C0] (t=10500 jiffies g=9253 q=83) [ 498.138886][ C0] rcu: rcu_preempt kthread starved for 10480 jiffies! g9253 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 498.150129][ C0] rcu: RCU grace-period kthread stack dump: [ 498.155994][ C0] rcu_preempt I29320 10 2 0x80004000 [ 498.162318][ C0] Call Trace: [ 498.165677][ C0] __schedule+0x755/0x1580 [ 498.170077][ C0] ? __sched_text_start+0x8/0x8 [ 498.174919][ C0] schedule+0xd9/0x260 [ 498.178969][ C0] schedule_timeout+0x486/0xc50 [ 498.183803][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 498.188720][ C0] ? usleep_range+0x170/0x170 [ 498.193373][ C0] ? trace_hardirqs_on+0x67/0x240 [ 498.198374][ C0] ? __kasan_check_read+0x11/0x20 [ 498.203385][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 498.208916][ C0] ? swake_up_one+0x60/0x60 [ 498.213405][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 498.218151][ C0] ? rcu_barrier+0x310/0x310 [ 498.222718][ C0] ? trace_hardirqs_on+0x67/0x240 [ 498.227715][ C0] ? __kasan_check_read+0x11/0x20 [ 498.232719][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 498.238935][ C0] ? __kthread_parkme+0x108/0x1c0 [ 498.243932][ C0] ? __kasan_check_read+0x11/0x20 [ 498.248930][ C0] kthread+0x361/0x430 [ 498.252975][ C0] ? rcu_barrier+0x310/0x310 [ 498.257540][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 498.263758][ C0] ret_from_fork+0x24/0x30 [ 498.268182][ C0] NMI backtrace for cpu 0 [ 498.272501][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc8+ #0 [ 498.279582][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 498.289607][ C0] Call Trace: [ 498.292866][ C0] [ 498.295752][ C0] dump_stack+0x172/0x1f0 [ 498.300062][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 498.305235][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 498.311455][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 498.317062][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 498.323018][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 498.328885][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 498.333975][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 498.339497][ C0] ? raise_softirq+0x138/0x340 [ 498.344239][ C0] update_process_times+0x32/0x80 [ 498.349243][ C0] tick_sched_handle+0xa2/0x190 [ 498.354070][ C0] tick_sched_timer+0x53/0x140 [ 498.358815][ C0] __hrtimer_run_queues+0x364/0xe40 [ 498.363990][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 498.369254][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 498.374773][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 498.380469][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 498.386521][ C0] hrtimer_interrupt+0x314/0x770 [ 498.391483][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 498.397018][ C0] apic_timer_interrupt+0xf/0x20 [ 498.401964][ C0] RIP: 0010:hhf_dequeue+0x679/0xa20 [ 498.407145][ C0] Code: 20 00 0f 85 5b 03 00 00 4d 8b bd 98 03 00 00 48 89 df 48 8b 55 c8 4c 89 fe e8 b3 d9 77 fd 31 ff 89 c6 88 45 b0 e8 37 15 ac fb <0f> b6 75 b0 40 84 f6 0f 84 c6 f9 ff ff e8 e5 13 ac fb 4c 89 f0 48 [ 498.426733][ C0] RSP: 0018:ffff8880ae809038 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 498.435127][ C0] RAX: 0000000000000702 RBX: ffff8880a7a6fdf8 RCX: ffffffff85c660f9 [ 498.443077][ C0] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000001 [ 498.451022][ C0] RBP: ffff8880ae809088 R08: ffffffff88c7a1c0 R09: 0000000000000000 [ 498.458968][ C0] R10: fffffbfff134afaf R11: ffffffff88c7a1c0 R12: dffffc0000000000 [ 498.466917][ C0] R13: ffff8880a7a6fb00 R14: ffff8880a7a6fe98 R15: ffff8880a7a6fe90 [ 498.474872][ C0] ? apic_timer_interrupt+0xa/0x20 [ 498.479963][ C0] ? hhf_dequeue+0x679/0xa20 [ 498.484531][ C0] ? hhf_dequeue+0x679/0xa20 [ 498.489152][ C0] __qdisc_run+0x1e7/0x19d0 [ 498.493655][ C0] ? dev_queue_xmit+0x18/0x20 [ 498.498313][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 498.503317][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 498.508683][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 498.513950][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 498.520187][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 498.525471][ C0] ? br_forward_finish+0x235/0x400 [ 498.530563][ C0] ? __kasan_check_read+0x11/0x20 [ 498.535562][ C0] ? __dev_queue_xmit+0x2b15/0x3650 [ 498.540742][ C0] dev_queue_xmit+0x18/0x20 [ 498.545239][ C0] ? dev_queue_xmit+0x18/0x20 [ 498.549891][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 498.555293][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 498.559861][ C0] br_forward_finish+0xfa/0x400 [ 498.564688][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 498.570208][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 498.574950][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 498.580645][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 498.585212][ C0] __br_forward+0x641/0xb00 [ 498.589691][ C0] ? br_forward_finish+0x400/0x400 [ 498.594779][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 498.600303][ C0] deliver_clone+0x61/0xc0 [ 498.604698][ C0] maybe_deliver+0x2c7/0x390 [ 498.609277][ C0] br_flood+0x13a/0x3d0 [ 498.613462][ C0] br_dev_xmit+0x98c/0x15a0 [ 498.617946][ C0] ? br_poll_controller+0x10/0x10 [ 498.622947][ C0] ? netif_skb_features+0x6c2/0xb90 [ 498.628153][ C0] ? netdev_set_sb_channel+0xe0/0xe0 [ 498.633417][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 498.639652][ C0] ? validate_xmit_xfrm+0x43c/0xf10 [ 498.644828][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 498.651044][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 498.656134][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 498.662352][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 498.667355][ C0] ? __nf_conntrack_find_get+0xa97/0x13a0 [ 498.673052][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 498.678373][ C0] ? __ip_finish_output+0x5fc/0xb90 [ 498.683551][ C0] ? __kasan_check_read+0x11/0x20 [ 498.688562][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 498.694778][ C0] ? __nf_ct_refresh_acct+0x93/0x2d0 [ 498.700048][ C0] ? lock_downgrade+0x920/0x920 [ 498.704874][ C0] ? lock_acquire+0x190/0x410 [ 498.709527][ C0] ? __ip_finish_output+0x5fc/0xb90 [ 498.714705][ C0] dev_queue_xmit+0x18/0x20 [ 498.719193][ C0] ? dev_queue_xmit+0x18/0x20 [ 498.723848][ C0] ip_finish_output2+0x1726/0x2570 [ 498.728968][ C0] ? nf_ct_deliver_cached_events+0x23d/0x6e0 [ 498.734932][ C0] ? ip_frag_next+0x910/0x910 [ 498.739585][ C0] ? __kasan_check_read+0x11/0x20 [ 498.744587][ C0] __ip_finish_output+0x5fc/0xb90 [ 498.749584][ C0] ? __ip_finish_output+0x5fc/0xb90 [ 498.754759][ C0] ? audit_alloc_mark+0x430/0x500 [ 498.759760][ C0] ip_finish_output+0x38/0x1f0 [ 498.764504][ C0] ip_output+0x21f/0x640 [ 498.768734][ C0] ? ip_mc_output+0xf40/0xf40 [ 498.773389][ C0] ? __ip_finish_output+0xb90/0xb90 [ 498.778561][ C0] ? __kasan_check_read+0x11/0x20 [ 498.783565][ C0] ip_local_out+0xbb/0x190 [ 498.787991][ C0] igmpv3_sendpack+0x1b5/0x2c0 [ 498.792731][ C0] igmp_ifc_timer_expire+0x687/0xa00 [ 498.797992][ C0] ? call_timer_fn+0xe0/0x780 [ 498.802649][ C0] call_timer_fn+0x1ac/0x780 [ 498.807216][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 498.812313][ C0] ? msleep_interruptible+0x150/0x150 [ 498.817661][ C0] ? trace_hardirqs_on+0x67/0x240 [ 498.822659][ C0] ? __kasan_check_read+0x11/0x20 [ 498.827659][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 498.832747][ C0] ? __ip_mc_dec_group+0x520/0x520 [ 498.837840][ C0] run_timer_softirq+0x697/0x17a0 [ 498.842842][ C0] ? add_timer+0x930/0x930 [ 498.847238][ C0] ? kvm_clock_read+0x18/0x30 [ 498.851892][ C0] ? kvm_sched_clock_read+0x9/0x20 [ 498.856980][ C0] ? sched_clock+0x2e/0x50 [ 498.861375][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 498.866202][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 498.872419][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 498.878636][ C0] __do_softirq+0x262/0x98c [ 498.883115][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 498.887945][ C0] irq_exit+0x19b/0x1e0 [ 498.892079][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 498.897611][ C0] apic_timer_interrupt+0xf/0x20 [ 498.902519][ C0] [ 498.905459][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 498.910826][ C0] Code: 38 73 6e fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 24 1b 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 14 1b 4a 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 ee 32 22 fa e8 39 [ 498.930407][ C0] RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 498.938810][ C0] RAX: 1ffffffff11a5e8d RBX: ffffffff88c7a1c0 RCX: 1ffffffff134b5ee [ 498.946760][ C0] RDX: dffffc0000000000 RSI: ffffffff8177f14e RDI: ffffffff873e050c [ 498.954726][ C0] RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439 [ 498.962681][ C0] R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000 [ 498.970630][ C0] R13: ffffffff89a57d78 R14: 0000000000000000 R15: 0000000000000000 [ 498.978598][ C0] ? trace_hardirqs_on+0x5e/0x240 [ 498.983602][ C0] ? default_idle+0x1c/0x360 [ 498.988172][ C0] ? default_idle+0x4e/0x360 [ 498.992760][ C0] arch_cpu_idle+0xa/0x10 [ 498.997070][ C0] default_idle_call+0x84/0xb0 [ 499.001814][ C0] do_idle+0x413/0x760 [ 499.005863][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 499.010873][ C0] ? trace_hardirqs_on+0x67/0x240 [ 499.015877][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 499.022102][ C0] ? debug_smp_processor_id+0x3c/0x214 [ 499.027546][ C0] cpu_startup_entry+0x1b/0x20 [ 499.032287][ C0] rest_init+0x245/0x37b [ 499.036575][ C0] arch_call_rest_init+0xe/0x1b [ 499.041403][ C0] start_kernel+0x912/0x951 [ 499.045883][ C0] ? mem_encrypt_init+0xb/0xb [ 499.050543][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 499.056762][ C0] ? x86_family+0x41/0x50 [ 499.061068][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 499.067283][ C0] x86_64_start_reservations+0x29/0x2b [ 499.072738][ C0] x86_64_start_kernel+0x77/0x7b [ 499.077661][ C0] secondary_startup_64+0xa4/0xb0