[....] 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. [ 64.647300][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 64.647311][ T26] audit: type=1800 audit(1568305919.322:29): pid=9758 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 [ 64.673931][ T26] audit: type=1800 audit(1568305919.332:30): pid=9758 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 '10.128.0.212' (ECDSA) to the list of known hosts. syzkaller login: [ 101.746054][ T9913] IPVS: ftp: loaded support on port[0] = 21 [ 101.793927][ T9913] chnl_net:caif_netlink_parms(): no params data found [ 101.816919][ T9913] bridge0: port 1(bridge_slave_0) entered blocking state [ 101.824132][ T9913] bridge0: port 1(bridge_slave_0) entered disabled state [ 101.831846][ T9913] device bridge_slave_0 entered promiscuous mode [ 101.839980][ T9913] bridge0: port 2(bridge_slave_1) entered blocking state [ 101.847043][ T9913] bridge0: port 2(bridge_slave_1) entered disabled state [ 101.854696][ T9913] device bridge_slave_1 entered promiscuous mode [ 101.867742][ T9913] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 101.878041][ T9913] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 101.894262][ T9913] team0: Port device team_slave_0 added [ 101.901490][ T9913] team0: Port device team_slave_1 added [ 101.979150][ T9913] device hsr_slave_0 entered promiscuous mode [ 102.047897][ T9913] device hsr_slave_1 entered promiscuous mode [ 102.113588][ T9913] bridge0: port 2(bridge_slave_1) entered blocking state [ 102.120822][ T9913] bridge0: port 2(bridge_slave_1) entered forwarding state [ 102.128160][ T9913] bridge0: port 1(bridge_slave_0) entered blocking state [ 102.135359][ T9913] bridge0: port 1(bridge_slave_0) entered forwarding state [ 102.157852][ T9913] 8021q: adding VLAN 0 to HW filter on device bond0 [ 102.169951][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 102.188253][ T9915] bridge0: port 1(bridge_slave_0) entered disabled state [ 102.195827][ T9915] bridge0: port 2(bridge_slave_1) entered disabled state [ 102.203920][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 102.213789][ T9913] 8021q: adding VLAN 0 to HW filter on device team0 [ 102.222947][ T2834] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 102.231479][ T2834] bridge0: port 1(bridge_slave_0) entered blocking state [ 102.238550][ T2834] bridge0: port 1(bridge_slave_0) entered forwarding state [ 102.256860][ T9913] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 102.267393][ T9913] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 102.279669][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 102.288436][ T9915] bridge0: port 2(bridge_slave_1) entered blocking state [ 102.295492][ T9915] bridge0: port 2(bridge_slave_1) entered forwarding state [ 102.303542][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 102.312500][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 102.320958][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 102.329149][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 102.337596][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 102.345134][ T9915] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 102.359539][ T9913] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 207.427487][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 207.434132][ C1] rcu: 1-...!: (1 GPs behind) idle=bba/1/0x4000000000000002 softirq=9117/9118 fqs=1 [ 207.443649][ C1] (t=10500 jiffies g=9193 q=27) [ 207.448583][ C1] rcu: rcu_preempt kthread starved for 10498 jiffies! g9193 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 207.459831][ C1] rcu: RCU grace-period kthread stack dump: [ 207.465701][ C1] rcu_preempt I29688 10 2 0x80004000 [ 207.472028][ C1] Call Trace: [ 207.475329][ C1] __schedule+0x755/0x1580 [ 207.479739][ C1] ? __sched_text_start+0x8/0x8 [ 207.484583][ C1] schedule+0xd9/0x260 [ 207.488632][ C1] schedule_timeout+0x486/0xc50 [ 207.493466][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 207.498383][ C1] ? usleep_range+0x170/0x170 [ 207.503038][ C1] ? trace_hardirqs_on+0x67/0x240 [ 207.508053][ C1] ? __kasan_check_read+0x11/0x20 [ 207.513058][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 207.518590][ C1] ? swake_up_one+0x60/0x60 [ 207.523074][ C1] rcu_gp_kthread+0x9b2/0x18c0 [ 207.527820][ C1] ? rcu_barrier+0x310/0x310 [ 207.532399][ C1] ? trace_hardirqs_on+0x67/0x240 [ 207.537403][ C1] ? __kasan_check_read+0x11/0x20 [ 207.542416][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 207.548636][ C1] ? __kthread_parkme+0x108/0x1c0 [ 207.553644][ C1] ? __kasan_check_read+0x11/0x20 [ 207.558653][ C1] kthread+0x361/0x430 [ 207.562705][ C1] ? rcu_barrier+0x310/0x310 [ 207.567290][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 207.573512][ C1] ret_from_fork+0x24/0x30 [ 207.577945][ C1] NMI backtrace for cpu 1 [ 207.582264][ C1] CPU: 1 PID: 9915 Comm: kworker/1:2 Not tainted 5.3.0-rc8+ #0 [ 207.589780][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 207.599833][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 207.605790][ C1] Call Trace: [ 207.609053][ C1] [ 207.611888][ C1] dump_stack+0x172/0x1f0 [ 207.616204][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 207.621394][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 207.627617][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 207.633388][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 207.639361][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 207.645244][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 207.650351][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 207.655927][ C1] ? raise_softirq+0x138/0x340 [ 207.660692][ C1] update_process_times+0x32/0x80 [ 207.665705][ C1] tick_sched_handle+0xa2/0x190 [ 207.670553][ C1] tick_sched_timer+0x53/0x140 [ 207.675303][ C1] __hrtimer_run_queues+0x364/0xe40 [ 207.680492][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 207.685760][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 207.691286][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 207.696987][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 207.703033][ C1] hrtimer_interrupt+0x314/0x770 [ 207.707964][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 207.713490][ C1] apic_timer_interrupt+0xf/0x20 [ 207.718404][ C1] [ 207.721341][ C1] RIP: 0010:hhf_dequeue+0x7a/0xa20 [ 207.726438][ C1] Code: fb 48 8b 45 c0 80 38 00 0f 85 a8 07 00 00 48 8b 75 d0 49 8b 85 80 03 00 00 49 89 f6 48 39 c6 0f 84 8c 04 00 00 e8 f6 19 ac fb <4c> 89 f0 48 c1 e8 03 42 80 3c 20 00 0f 85 6d 07 00 00 49 8b 1e 48 [ 207.746020][ C1] RSP: 0018:ffff888085c4ed58 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 207.754411][ C1] RAX: ffff88809691a300 RBX: ffff88808948bdf8 RCX: ffffffff85c660f9 [ 207.762362][ C1] RDX: 0000000000000000 RSI: ffffffff85c65afa RDI: ffff88808948be00 [ 207.770313][ C1] RBP: ffff888085c4eda8 R08: ffff88809691a300 R09: 0000000000000000 [ 207.778267][ C1] R10: fffffbfff134afaf R11: ffff88809691a300 R12: dffffc0000000000 [ 207.786222][ C1] R13: ffff88808948bb00 R14: ffff88808948be90 R15: ffff88808948be90 [ 207.794184][ C1] ? hhf_dequeue+0x679/0xa20 [ 207.798754][ C1] ? hhf_dequeue+0x7a/0xa20 [ 207.803252][ C1] ? hhf_dequeue+0x7a/0xa20 [ 207.807739][ C1] __qdisc_run+0x1e7/0x19d0 [ 207.812225][ C1] ? dev_queue_xmit+0x18/0x20 [ 207.816887][ C1] __dev_queue_xmit+0x16f1/0x3650 [ 207.821904][ C1] ? __local_bh_enable_ip+0x15a/0x270 [ 207.827274][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 207.832545][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 207.838766][ C1] ? br_nf_post_routing+0xd73/0x1d30 [ 207.844037][ C1] ? br_forward_finish+0x235/0x400 [ 207.849134][ C1] ? __kasan_check_read+0x11/0x20 [ 207.854161][ C1] ? __dev_queue_xmit+0x2b15/0x3650 [ 207.859370][ C1] dev_queue_xmit+0x18/0x20 [ 207.863862][ C1] ? dev_queue_xmit+0x18/0x20 [ 207.868536][ C1] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 207.873905][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 207.878482][ C1] br_forward_finish+0xfa/0x400 [ 207.883318][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 207.888851][ C1] ? br_fdb_add.cold+0x8c/0x8c [ 207.893604][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 207.899332][ C1] ? nf_hook_slow+0xf0/0x1e0 [ 207.903941][ C1] __br_forward+0x641/0xb00 [ 207.908433][ C1] ? br_forward_finish+0x400/0x400 [ 207.913541][ C1] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 207.919073][ C1] deliver_clone+0x61/0xc0 [ 207.923468][ C1] maybe_deliver+0x2c7/0x390 [ 207.928042][ C1] br_flood+0x13a/0x3d0 [ 207.932182][ C1] br_dev_xmit+0x98c/0x15a0 [ 207.936670][ C1] ? br_poll_controller+0x10/0x10 [ 207.941680][ C1] ? netif_skb_features+0x6c2/0xb90 [ 207.946866][ C1] ? netdev_set_sb_channel+0xe0/0xe0 [ 207.952136][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 207.958360][ C1] ? validate_xmit_xfrm+0x43c/0xf10 [ 207.963549][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 207.968478][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 207.974714][ C1] dev_hard_start_xmit+0x1a3/0x9c0 [ 207.979847][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 207.986105][ C1] __dev_queue_xmit+0x2b15/0x3650 [ 207.991152][ C1] ? ndisc_constructor+0x1a5/0xb40 [ 207.996272][ C1] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 208.001557][ C1] ? ip6_finish_output2+0x1034/0x2520 [ 208.006932][ C1] ? __kasan_check_read+0x11/0x20 [ 208.011946][ C1] ? lock_downgrade+0x920/0x920 [ 208.016782][ C1] dev_queue_xmit+0x18/0x20 [ 208.021271][ C1] ? dev_queue_xmit+0x18/0x20 [ 208.026020][ C1] neigh_resolve_output+0x5a5/0x970 [ 208.031206][ C1] ip6_finish_output2+0x1034/0x2520 [ 208.036390][ C1] ? ip6_forward_finish+0x530/0x530 [ 208.041585][ C1] ? lock_downgrade+0x920/0x920 [ 208.046432][ C1] ? ip6_mtu+0x16f/0x460 [ 208.050662][ C1] __ip6_finish_output+0x444/0xa50 [ 208.055758][ C1] ? __ip6_finish_output+0x444/0xa50 [ 208.061124][ C1] ip6_finish_output+0x38/0x1f0 [ 208.065955][ C1] ip6_output+0x235/0x7c0 [ 208.070271][ C1] ? ip6_finish_output+0x1f0/0x1f0 [ 208.075373][ C1] ? __ip6_finish_output+0xa50/0xa50 [ 208.080664][ C1] ? ndisc_send_skb+0x803/0x1450 [ 208.085601][ C1] ndisc_send_skb+0xf29/0x1450 [ 208.090351][ C1] ? nf_hook.constprop.0+0x560/0x560 [ 208.095623][ C1] ? skb_set_owner_w+0x21b/0x320 [ 208.100546][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 208.106250][ C1] ndisc_send_ns+0x3a9/0x850 [ 208.110825][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 208.117055][ C1] ? ndisc_netdev_event+0x4e0/0x4e0 [ 208.122247][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 208.127439][ C1] ? trace_hardirqs_on+0x67/0x240 [ 208.132451][ C1] ? addrconf_dad_work+0xac4/0x1150 [ 208.137634][ C1] addrconf_dad_work+0xb88/0x1150 [ 208.142644][ C1] ? addrconf_dad_completed+0xbb0/0xbb0 [ 208.148170][ C1] ? lock_acquire+0x190/0x410 [ 208.152927][ C1] ? trace_hardirqs_on+0x67/0x240 [ 208.157958][ C1] process_one_work+0x9af/0x1740 [ 208.162884][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 208.168241][ C1] ? lock_acquire+0x190/0x410 [ 208.172907][ C1] worker_thread+0x98/0xe40 [ 208.177393][ C1] ? trace_hardirqs_on+0x67/0x240 [ 208.182404][ C1] kthread+0x361/0x430 [ 208.186459][ C1] ? process_one_work+0x1740/0x1740 [ 208.191640][ C1] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 208.197863][ C1] ret_from_fork+0x24/0x30