[....] 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. [ 65.375815][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 65.375825][ T26] audit: type=1800 audit(1568315034.364:29): pid=9677 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 [ 65.402267][ T26] audit: type=1800 audit(1568315034.364:30): pid=9677 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 '10.128.0.22' (ECDSA) to the list of known hosts. syzkaller login: [ 87.298682][ T9829] IPVS: ftp: loaded support on port[0] = 21 [ 87.341141][ T9829] chnl_net:caif_netlink_parms(): no params data found [ 87.362378][ T9829] bridge0: port 1(bridge_slave_0) entered blocking state [ 87.369615][ T9829] bridge0: port 1(bridge_slave_0) entered disabled state [ 87.377160][ T9829] device bridge_slave_0 entered promiscuous mode [ 87.384394][ T9829] bridge0: port 2(bridge_slave_1) entered blocking state [ 87.391655][ T9829] bridge0: port 2(bridge_slave_1) entered disabled state [ 87.399182][ T9829] device bridge_slave_1 entered promiscuous mode [ 87.412958][ T9829] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 87.423378][ T9829] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 87.439304][ T9829] team0: Port device team_slave_0 added [ 87.445688][ T9829] team0: Port device team_slave_1 added [ 87.527604][ T9829] device hsr_slave_0 entered promiscuous mode [ 87.596327][ T9829] device hsr_slave_1 entered promiscuous mode [ 87.661012][ T9829] bridge0: port 2(bridge_slave_1) entered blocking state [ 87.668090][ T9829] bridge0: port 2(bridge_slave_1) entered forwarding state [ 87.675347][ T9829] bridge0: port 1(bridge_slave_0) entered blocking state [ 87.682421][ T9829] bridge0: port 1(bridge_slave_0) entered forwarding state [ 87.705026][ T9829] 8021q: adding VLAN 0 to HW filter on device bond0 [ 87.716096][ T9831] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 87.724132][ T9831] bridge0: port 1(bridge_slave_0) entered disabled state [ 87.732267][ T9831] bridge0: port 2(bridge_slave_1) entered disabled state [ 87.740145][ T9831] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 87.750825][ T9829] 8021q: adding VLAN 0 to HW filter on device team0 [ 87.759918][ T2662] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 87.768442][ T2662] bridge0: port 1(bridge_slave_0) entered blocking state [ 87.775484][ T2662] bridge0: port 1(bridge_slave_0) entered forwarding state [ 87.786678][ T9831] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 87.794965][ T9831] bridge0: port 2(bridge_slave_1) entered blocking state [ 87.802028][ T9831] bridge0: port 2(bridge_slave_1) entered forwarding state [ 87.813250][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 87.821721][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 87.831678][ T9831] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 87.844615][ T9829] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network executing program [ 87.855598][ T9829] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 87.867434][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 87.875651][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 87.884040][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 87.898746][ T9829] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 192.945945][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 192.953018][ C0] rcu: 0-...!: (1 GPs behind) idle=c4a/1/0x4000000000000002 softirq=9228/9232 fqs=41 [ 192.962621][ C0] (t=10501 jiffies g=9073 q=114) [ 192.967641][ C0] rcu: rcu_preempt kthread starved for 10420 jiffies! g9073 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 192.978898][ C0] rcu: RCU grace-period kthread stack dump: [ 192.984776][ C0] rcu_preempt I29520 10 2 0x80004000 [ 192.991088][ C0] Call Trace: [ 192.994383][ C0] __schedule+0x755/0x1580 [ 192.998788][ C0] ? __sched_text_start+0x8/0x8 [ 193.003623][ C0] schedule+0xd9/0x260 [ 193.007678][ C0] schedule_timeout+0x486/0xc50 [ 193.012511][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 193.017428][ C0] ? usleep_range+0x170/0x170 [ 193.022094][ C0] ? trace_hardirqs_on+0x67/0x240 [ 193.027135][ C0] ? __kasan_check_read+0x11/0x20 [ 193.032149][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 193.037674][ C0] ? swake_up_one+0x60/0x60 [ 193.042171][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 193.046925][ C0] ? rcu_barrier+0x310/0x310 [ 193.051587][ C0] ? trace_hardirqs_on+0x67/0x240 [ 193.056779][ C0] ? __kasan_check_read+0x11/0x20 [ 193.061788][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 193.068007][ C0] ? __kthread_parkme+0x108/0x1c0 [ 193.073630][ C0] ? __kasan_check_read+0x11/0x20 [ 193.078743][ C0] kthread+0x361/0x430 [ 193.082805][ C0] ? rcu_barrier+0x310/0x310 [ 193.088270][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 193.094582][ C0] ret_from_fork+0x24/0x30 [ 193.099008][ C0] NMI backtrace for cpu 0 [ 193.103542][ C0] CPU: 0 PID: 9831 Comm: kworker/0:2 Not tainted 5.3.0-rc8+ #0 [ 193.111145][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 193.121197][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 193.127156][ C0] Call Trace: [ 193.130428][ C0] [ 193.133261][ C0] dump_stack+0x172/0x1f0 [ 193.137583][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 193.142784][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 193.149024][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 193.154657][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 193.160628][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 193.166602][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 193.171701][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 193.177242][ C0] ? raise_softirq+0x138/0x340 [ 193.181996][ C0] update_process_times+0x32/0x80 [ 193.187042][ C0] tick_sched_handle+0xa2/0x190 [ 193.191964][ C0] tick_sched_timer+0x53/0x140 [ 193.196796][ C0] __hrtimer_run_queues+0x364/0xe40 [ 193.201983][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 193.207254][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 193.212798][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 193.218498][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 193.224581][ C0] hrtimer_interrupt+0x314/0x770 [ 193.229517][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 193.235056][ C0] apic_timer_interrupt+0xf/0x20 [ 193.240160][ C0] [ 193.243089][ C0] RIP: 0010:__list_del_entry_valid+0xb1/0xf5 [ 193.249065][ C0] Code: 02 00 75 53 49 8b 14 24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 24 49 8b 55 08 4c 39 f2 0f 85 aa 00 00 00 41 5c b8 01 00 00 00 [ 193.268660][ C0] RSP: 0018:ffff8880a76d6d30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 193.277066][ C0] RAX: dffffc0000000000 RBX: ffff888091d1f4f8 RCX: ffffffff85c65b39 [ 193.285112][ C0] RDX: 1ffff110123a3eb3 RSI: ffffffff85c66006 RDI: ffff888091d1f598 [ 193.293084][ C0] RBP: ffff8880a76d6d48 R08: ffff88808db7e5c0 R09: 0000000000000000 [ 193.301231][ C0] R10: fffffbfff134afaf R11: ffff88808db7e5c0 R12: ffff888091d1f590 [ 193.309993][ C0] R13: ffff888091d1f590 R14: ffff888091d1f4f8 R15: 0000000000000000 [ 193.318057][ C0] ? hhf_dequeue+0xb9/0xa20 [ 193.322638][ C0] ? hhf_dequeue+0x586/0xa20 [ 193.327219][ C0] hhf_dequeue+0x5c5/0xa20 [ 193.331627][ C0] __qdisc_run+0x1e7/0x19d0 [ 193.336117][ C0] ? dev_queue_xmit+0x18/0x20 [ 193.340784][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 193.345791][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 193.351141][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 193.356411][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 193.363519][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 193.368877][ C0] ? br_forward_finish+0x235/0x400 [ 193.373980][ C0] ? __kasan_check_read+0x11/0x20 [ 193.378992][ C0] ? __dev_queue_xmit+0x2b15/0x3650 [ 193.384318][ C0] dev_queue_xmit+0x18/0x20 [ 193.389332][ C0] ? dev_queue_xmit+0x18/0x20 [ 193.394690][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 193.400055][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 193.404674][ C0] br_forward_finish+0xfa/0x400 [ 193.409507][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 193.415034][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 193.419909][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 193.425618][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 193.430191][ C0] __br_forward+0x641/0xb00 [ 193.434674][ C0] ? br_forward_finish+0x400/0x400 [ 193.439768][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 193.445295][ C0] deliver_clone+0x61/0xc0 [ 193.449690][ C0] maybe_deliver+0x2c7/0x390 [ 193.454282][ C0] br_flood+0x13a/0x3d0 [ 193.458440][ C0] br_dev_xmit+0x98c/0x15a0 [ 193.462961][ C0] ? br_poll_controller+0x10/0x10 [ 193.467972][ C0] ? netif_skb_features+0x6c2/0xb90 [ 193.473154][ C0] ? netdev_set_sb_channel+0xe0/0xe0 [ 193.478971][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 193.485196][ C0] ? validate_xmit_xfrm+0x43c/0xf10 [ 193.490374][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 193.495389][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 193.501621][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 193.506727][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 193.512962][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 193.517981][ C0] ? ndisc_constructor+0x1a5/0xb40 [ 193.523636][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 193.528911][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 193.534272][ C0] ? __kasan_check_read+0x11/0x20 [ 193.539307][ C0] ? lock_downgrade+0x920/0x920 [ 193.544141][ C0] dev_queue_xmit+0x18/0x20 [ 193.548653][ C0] ? dev_queue_xmit+0x18/0x20 [ 193.553427][ C0] neigh_resolve_output+0x5a5/0x970 [ 193.558623][ C0] ip6_finish_output2+0x1034/0x2520 [ 193.563804][ C0] ? ip6_mtu+0x2e6/0x460 [ 193.568309][ C0] ? ip6_forward_finish+0x530/0x530 [ 193.573505][ C0] ? lock_downgrade+0x920/0x920 [ 193.578342][ C0] ? ip6_mtu+0x16f/0x460 [ 193.582568][ C0] __ip6_finish_output+0x444/0xa50 [ 193.587751][ C0] ? __ip6_finish_output+0x444/0xa50 [ 193.593020][ C0] ip6_finish_output+0x38/0x1f0 [ 193.597861][ C0] ip6_output+0x235/0x7c0 [ 193.602174][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 193.607723][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 193.612999][ C0] ? ndisc_send_skb+0x803/0x1450 [ 193.617933][ C0] ndisc_send_skb+0xf29/0x1450 [ 193.622681][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 193.627958][ C0] ? skb_set_owner_w+0x21b/0x320 [ 193.632895][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 193.638596][ C0] ndisc_send_ns+0x3a9/0x850 [ 193.643185][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 193.649412][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 193.654626][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 193.659826][ C0] ? trace_hardirqs_on+0x67/0x240 [ 193.664840][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 193.670022][ C0] addrconf_dad_work+0xb88/0x1150 [ 193.675031][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 193.680560][ C0] ? lock_acquire+0x190/0x410 [ 193.685219][ C0] ? trace_hardirqs_on+0x67/0x240 [ 193.690256][ C0] process_one_work+0x9af/0x1740 [ 193.695200][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 193.700567][ C0] ? lock_acquire+0x190/0x410 [ 193.705238][ C0] worker_thread+0x98/0xe40 [ 193.709722][ C0] ? trace_hardirqs_on+0x67/0x240 [ 193.714731][ C0] kthread+0x361/0x430 [ 193.718792][ C0] ? process_one_work+0x1740/0x1740 [ 193.723986][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 193.730210][ C0] ret_from_fork+0x24/0x30