[....] 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. [ 67.675416][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 67.675426][ T26] audit: type=1800 audit(1567784418.688:29): pid=9636 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 [ 67.708922][ T26] audit: type=1800 audit(1567784418.688:30): pid=9636 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 '10.128.0.21' (ECDSA) to the list of known hosts. syzkaller login: [ 75.417465][ T9792] IPVS: ftp: loaded support on port[0] = 21 [ 75.458492][ T9792] chnl_net:caif_netlink_parms(): no params data found [ 75.479469][ T9792] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.486844][ T9792] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.494252][ T9792] device bridge_slave_0 entered promiscuous mode [ 75.501395][ T9792] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.508492][ T9792] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.516087][ T9792] device bridge_slave_1 entered promiscuous mode [ 75.529204][ T9792] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 75.539336][ T9792] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 75.554095][ T9792] team0: Port device team_slave_0 added [ 75.560849][ T9792] team0: Port device team_slave_1 added [ 75.627672][ T9792] device hsr_slave_0 entered promiscuous mode [ 75.675759][ T9792] device hsr_slave_1 entered promiscuous mode [ 75.750492][ T9792] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.757577][ T9792] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.764818][ T9792] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.771871][ T9792] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.795795][ T9792] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.805315][ T3027] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.824616][ T3027] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.832113][ T3027] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.840363][ T3027] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.849838][ T9792] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.858575][ T3518] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.867009][ T3518] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.874025][ T3518] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.891737][ T9792] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 75.902330][ T9792] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 75.914648][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.923059][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.930117][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.939126][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready executing program [ 75.947434][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.955650][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.963703][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.972266][ T9796] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 75.979710][ T9796] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.992965][ T9792] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 181.005480][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 181.012123][ C1] rcu: 1-...!: (10499 ticks this GP) idle=e02/1/0x4000000000000002 softirq=9705/9705 fqs=4 [ 181.022243][ C1] (t=10500 jiffies g=9309 q=84) [ 181.027161][ C1] rcu: rcu_preempt kthread starved for 10492 jiffies! g9309 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 181.038240][ C1] rcu: RCU grace-period kthread stack dump: [ 181.044103][ C1] rcu_preempt R running task 29112 10 2 0x80004000 [ 181.051979][ C1] Call Trace: [ 181.055258][ C1] __schedule+0x755/0x1580 [ 181.059660][ C1] ? __sched_text_start+0x8/0x8 [ 181.064490][ C1] schedule+0xd9/0x260 [ 181.068535][ C1] schedule_timeout+0x486/0xc50 [ 181.073368][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 181.078283][ C1] ? usleep_range+0x170/0x170 [ 181.082934][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.087963][ C1] ? __kasan_check_read+0x11/0x20 [ 181.092970][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 181.098492][ C1] ? swake_up_one+0x60/0x60 [ 181.102977][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 181.107722][ C1] ? rcu_barrier+0x310/0x310 [ 181.112290][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.117300][ C1] ? __kasan_check_read+0x11/0x20 [ 181.122305][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 181.128521][ C1] ? __kthread_parkme+0x108/0x1c0 [ 181.133530][ C1] ? __kasan_check_read+0x11/0x20 [ 181.138534][ C1] kthread+0x361/0x430 [ 181.142578][ C1] ? rcu_barrier+0x310/0x310 [ 181.147146][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 181.153361][ C1] ret_from_fork+0x24/0x30 [ 181.157762][ C1] NMI backtrace for cpu 1 [ 181.162083][ C1] CPU: 1 PID: 3027 Comm: kworker/1:2 Not tainted 5.3.0-rc7+ #0 [ 181.169608][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 181.179660][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 181.185612][ C1] Call Trace: [ 181.188876][ C1] [ 181.191707][ C1] dump_stack+0x172/0x1f0 [ 181.196015][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 181.201194][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 181.207415][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 181.213026][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 181.218985][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 181.224856][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 181.229948][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 181.235481][ C1] ? raise_softirq+0x138/0x340 [ 181.240227][ C1] update_process_times+0x32/0x80 [ 181.245230][ C1] tick_sched_handle+0xa2/0x190 [ 181.250056][ C1] tick_sched_timer+0x53/0x140 [ 181.254800][ C1] __hrtimer_run_queues+0x364/0xe40 [ 181.259976][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 181.265251][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 181.270789][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 181.276483][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 181.282526][ C1] hrtimer_interrupt+0x314/0x770 [ 181.287447][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 181.292975][ C1] apic_timer_interrupt+0xf/0x20 [ 181.297883][ C1] [ 181.300805][ C1] RIP: 0010:__list_del_entry_valid+0x4b/0xf5 [ 181.306763][ C1] Code: 54 80 3c 02 00 0f 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 <48> b8 00 01 00 00 00 00 ad de 4d 8b 2e 49 39 c5 0f 84 e1 00 00 00 [ 181.326371][ C1] RSP: 0018:ffff88809ff26d30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 181.334773][ C1] RAX: dffffc0000000000 RBX: ffff88808c560778 RCX: ffffffff85c64b39 [ 181.342724][ C1] RDX: 1ffff110118ac0ef RSI: ffffffff85c65006 RDI: ffff88808c560780 [ 181.350673][ C1] RBP: ffff88809ff26d48 R08: ffff88809ff08300 R09: 0000000000000000 [ 181.358623][ C1] R10: fffffbfff134af8f R11: ffff88809ff08300 R12: ffff88808c560810 [ 181.366579][ C1] R13: ffff88808c560480 R14: ffff88808c560778 R15: 0000000000000000 [ 181.374553][ C1] ? hhf_dequeue+0xb9/0xa20 [ 181.379037][ C1] ? hhf_dequeue+0x586/0xa20 [ 181.383612][ C1] hhf_dequeue+0x5c5/0xa20 [ 181.388013][ C1] __qdisc_run+0x1e7/0x19d0 [ 181.392498][ C1] ? dev_queue_xmit+0x18/0x20 [ 181.397154][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 181.402159][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 181.407514][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 181.412794][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 181.419013][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 181.424286][ C1] ? br_forward_finish+0x235/0x400 [ 181.429378][ C1] ? __kasan_check_read+0x11/0x20 [ 181.434380][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 181.439567][ C1] dev_queue_xmit+0x18/0x20 [ 181.444047][ C1] ? dev_queue_xmit+0x18/0x20 [ 181.448699][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 181.454050][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 181.458622][ C1] br_forward_finish+0xfa/0x400 [ 181.463451][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 181.468984][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 181.473728][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 181.479426][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 181.483993][ C1] __br_forward+0x641/0xb00 [ 181.488473][ C1] ? br_forward_finish+0x400/0x400 [ 181.493562][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 181.499086][ C1] deliver_clone+0x61/0xc0 [ 181.503482][ C1] maybe_deliver+0x2c7/0x390 [ 181.508048][ C1] br_flood+0x13a/0x3d0 [ 181.512185][ C1] br_dev_xmit+0x98c/0x15a0 [ 181.516670][ C1] ? br_poll_controller+0x10/0x10 [ 181.521673][ C1] ? netif_skb_features+0x6c2/0xb90 [ 181.526847][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 181.532110][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 181.538329][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 181.543505][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 181.548418][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 181.554635][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 181.559722][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 181.565941][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 181.570943][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 181.576033][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 181.581296][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 181.586648][ C1] ? __kasan_check_read+0x11/0x20 [ 181.591653][ C1] ? lock_downgrade+0x920/0x920 [ 181.596483][ C1] dev_queue_xmit+0x18/0x20 [ 181.600962][ C1] ? dev_queue_xmit+0x18/0x20 [ 181.605619][ C1] neigh_resolve_output+0x5a5/0x970 [ 181.610797][ C1] ip6_finish_output2+0x1034/0x2520 [ 181.615972][ C1] ? ip6_mtu+0x2e6/0x460 [ 181.620195][ C1] ? ip6_forward_finish+0x530/0x530 [ 181.625371][ C1] ? lock_downgrade+0x920/0x920 [ 181.630207][ C1] ? ip6_mtu+0x16f/0x460 [ 181.634430][ C1] __ip6_finish_output+0x444/0xa50 [ 181.639518][ C1] ? __ip6_finish_output+0x444/0xa50 [ 181.644779][ C1] ip6_finish_output+0x38/0x1f0 [ 181.649608][ C1] ip6_output+0x235/0x7c0 [ 181.653917][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 181.659006][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 181.664268][ C1] ? ndisc_send_skb+0x803/0x1450 [ 181.669542][ C1] ndisc_send_skb+0xf29/0x1450 [ 181.674292][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 181.679557][ C1] ? skb_set_owner_w+0x21b/0x320 [ 181.684473][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 181.690169][ C1] ndisc_send_ns+0x3a9/0x850 [ 181.694736][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 181.700956][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 181.706131][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 181.711651][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.716653][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 181.721830][ C1] addrconf_dad_work+0xb88/0x1150 [ 181.726833][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 181.732356][ C1] ? lock_acquire+0x190/0x410 [ 181.737008][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.742015][ C1] process_one_work+0x9af/0x1740 [ 181.746934][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 181.752279][ C1] ? lock_acquire+0x190/0x410 [ 181.756936][ C1] worker_thread+0x98/0xe40 [ 181.761413][ C1] ? trace_hardirqs_on+0x67/0x240 [ 181.766419][ C1] kthread+0x361/0x430 [ 181.770463][ C1] ? process_one_work+0x1740/0x1740 [ 181.775636][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 181.781853][ C1] ret_from_fork+0x24/0x30