[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.737792][ T26] audit: type=1800 audit(1568267608.559:25): pid=8531 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.784002][ T26] audit: type=1800 audit(1568267608.559:26): pid=8531 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.816506][ T26] audit: type=1800 audit(1568267608.569:27): pid=8531 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. syzkaller login: [ 69.793002][ T8686] IPVS: ftp: loaded support on port[0] = 21 [ 69.849188][ T8686] chnl_net:caif_netlink_parms(): no params data found [ 69.878352][ T8686] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.886262][ T8686] bridge0: port 1(bridge_slave_0) entered disabled state [ 69.894216][ T8686] device bridge_slave_0 entered promiscuous mode [ 69.902348][ T8686] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.910118][ T8686] bridge0: port 2(bridge_slave_1) entered disabled state [ 69.918310][ T8686] device bridge_slave_1 entered promiscuous mode [ 69.935576][ T8686] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 69.946607][ T8686] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 69.965181][ T8686] team0: Port device team_slave_0 added [ 69.972038][ T8686] team0: Port device team_slave_1 added [ 70.026456][ T8686] device hsr_slave_0 entered promiscuous mode [ 70.094314][ T8686] device hsr_slave_1 entered promiscuous mode [ 70.152132][ T8686] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.159474][ T8686] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.167305][ T8686] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.174562][ T8686] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.209569][ T8686] 8021q: adding VLAN 0 to HW filter on device bond0 [ 70.222221][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 70.244588][ T3516] bridge0: port 1(bridge_slave_0) entered disabled state [ 70.252781][ T3516] bridge0: port 2(bridge_slave_1) entered disabled state [ 70.261981][ T3516] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 70.273720][ T8686] 8021q: adding VLAN 0 to HW filter on device team0 [ 70.295407][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 70.304250][ T17] bridge0: port 1(bridge_slave_0) entered blocking state [ 70.311300][ T17] bridge0: port 1(bridge_slave_0) entered forwarding state [ 70.328206][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 70.337831][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 70.344964][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 70.364685][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 70.373184][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 70.382646][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 70.391279][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 70.400288][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready executing program [ 70.410471][ T8686] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 70.428426][ T8686] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 175.493870][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 175.500642][ C0] rcu: 0-...!: (10500 ticks this GP) idle=8c2/1/0x4000000000000002 softirq=9600/9600 fqs=0 [ 175.511374][ C0] (t=10500 jiffies g=6761 q=39) [ 175.516399][ C0] rcu: rcu_preempt kthread starved for 10500 jiffies! g6761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 [ 175.527664][ C0] rcu: RCU grace-period kthread stack dump: [ 175.533539][ C0] rcu_preempt I29656 10 2 0x80004000 [ 175.540107][ C0] Call Trace: [ 175.543408][ C0] __schedule+0x755/0x1580 [ 175.547912][ C0] ? __sched_text_start+0x8/0x8 [ 175.552852][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 175.558732][ C0] ? schedule_timeout+0x47c/0xc50 [ 175.563755][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 175.569168][ C0] schedule+0xd9/0x260 [ 175.573228][ C0] schedule_timeout+0x486/0xc50 [ 175.578096][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 175.583905][ C0] ? usleep_range+0x170/0x170 [ 175.588570][ C0] ? trace_hardirqs_on+0x67/0x240 [ 175.593616][ C0] ? __kasan_check_read+0x11/0x20 [ 175.598631][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 175.604167][ C0] ? swake_up_one+0x60/0x60 [ 175.608662][ C0] rcu_gp_kthread+0x9b2/0x18c0 [ 175.613426][ C0] ? rcu_barrier+0x310/0x310 [ 175.618013][ C0] ? trace_hardirqs_on+0x67/0x240 [ 175.623024][ C0] ? __kasan_check_read+0x11/0x20 [ 175.628136][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 175.634366][ C0] ? __kthread_parkme+0x108/0x1c0 [ 175.639384][ C0] ? __kasan_check_read+0x11/0x20 [ 175.644437][ C0] kthread+0x361/0x430 [ 175.648494][ C0] ? rcu_barrier+0x310/0x310 [ 175.653083][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 175.659372][ C0] ret_from_fork+0x24/0x30 [ 175.663832][ C0] NMI backtrace for cpu 0 [ 175.668157][ C0] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.3.0-rc7+ #0 [ 175.675506][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 175.685574][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 175.691541][ C0] Call Trace: [ 175.694813][ C0] [ 175.697763][ C0] dump_stack+0x172/0x1f0 [ 175.702092][ C0] nmi_cpu_backtrace.cold+0x70/0xb2 [ 175.707421][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 175.713661][ C0] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 175.719390][ C0] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 175.725366][ C0] arch_trigger_cpumask_backtrace+0x14/0x20 [ 175.731370][ C0] rcu_dump_cpu_stacks+0x183/0x1cf [ 175.736740][ C0] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 175.742281][ C0] ? raise_softirq+0x138/0x340 [ 175.747134][ C0] update_process_times+0x32/0x80 [ 175.752166][ C0] tick_sched_handle+0xa2/0x190 [ 175.757019][ C0] tick_sched_timer+0x53/0x140 [ 175.761888][ C0] __hrtimer_run_queues+0x364/0xe40 [ 175.767089][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 175.772543][ C0] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 175.778086][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 175.783798][ C0] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 175.789860][ C0] hrtimer_interrupt+0x314/0x770 [ 175.794799][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 175.800370][ C0] apic_timer_interrupt+0xf/0x20 [ 175.805375][ C0] [ 175.808339][ C0] RIP: 0010:write_comp_data+0x10/0x70 [ 175.813794][ C0] Code: 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 58 88 8f 7e 00 01 1f 00 75 51 41 8b 80 f0 12 00 00 83 f8 03 75 45 49 8b 80 [ 175.833656][ C0] RSP: 0018:ffff8880a988ed40 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 175.842148][ C0] RAX: 0000000000000601 RBX: ffff8880a5e70bf8 RCX: ffffffff85c7dbb9 [ 175.850193][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 175.858152][ C0] RBP: ffff8880a988ed48 R08: ffff8880a9880140 R09: fffffbfff14e9555 [ 175.866206][ C0] R10: ffff8880a9880b38 R11: ffff8880a9880140 R12: dffffc0000000000 [ 175.874164][ C0] R13: ffff8880a5e70900 R14: ffff8880a5e70c90 R15: 0000000000000000 [ 175.882142][ C0] ? hhf_dequeue+0xb9/0xa20 [ 175.886662][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 175.892889][ C0] hhf_dequeue+0xb9/0xa20 [ 175.897213][ C0] __qdisc_run+0x1e7/0x19d0 [ 175.901710][ C0] ? dev_queue_xmit+0x18/0x20 [ 175.906390][ C0] __dev_queue_xmit+0x16f1/0x3650 [ 175.911408][ C0] ? __local_bh_enable_ip+0x15a/0x270 [ 175.916848][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 175.922300][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 175.929138][ C0] ? br_nf_post_routing+0xd73/0x1d30 [ 175.934414][ C0] ? br_forward_finish+0x235/0x400 [ 175.939522][ C0] ? find_held_lock+0x35/0x130 [ 175.944278][ C0] ? br_forward_finish+0x235/0x400 [ 175.949401][ C0] dev_queue_xmit+0x18/0x20 [ 175.954005][ C0] ? dev_queue_xmit+0x18/0x20 [ 175.958825][ C0] br_dev_queue_push_xmit+0x3f3/0x5c0 [ 175.964204][ C0] ? __kasan_check_read+0x11/0x20 [ 175.969240][ C0] br_forward_finish+0xfa/0x400 [ 175.974185][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 175.979736][ C0] ? br_fdb_add.cold+0x8c/0x8c [ 175.984751][ C0] ? __kasan_check_read+0x11/0x20 [ 175.989802][ C0] __br_forward+0x641/0xb00 [ 175.994297][ C0] ? br_forward_finish+0x400/0x400 [ 175.999522][ C0] ? br_dev_queue_push_xmit+0x5c0/0x5c0 [ 176.005236][ C0] deliver_clone+0x61/0xc0 [ 176.009648][ C0] maybe_deliver+0x2c7/0x390 [ 176.014238][ C0] br_flood+0x13a/0x3d0 [ 176.018832][ C0] br_dev_xmit+0x98c/0x15a0 [ 176.023332][ C0] ? br_poll_controller+0x10/0x10 [ 176.028359][ C0] ? netif_skb_features+0x6c2/0xb90 [ 176.033557][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.039789][ C0] dev_hard_start_xmit+0x1a3/0x9c0 [ 176.044906][ C0] __dev_queue_xmit+0x2b15/0x3650 [ 176.049943][ C0] ? __kasan_check_read+0x11/0x20 [ 176.054972][ C0] ? __lock_acquire+0x1702/0x4c30 [ 176.059993][ C0] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 176.065268][ C0] ? ip6_finish_output2+0x1034/0x2520 [ 176.071499][ C0] ? __kasan_check_read+0x11/0x20 [ 176.076513][ C0] ? mark_lock+0xc0/0x11e0 [ 176.081174][ C0] ? mark_held_locks+0xa4/0xf0 [ 176.085955][ C0] dev_queue_xmit+0x18/0x20 [ 176.090457][ C0] ? dev_queue_xmit+0x18/0x20 [ 176.095136][ C0] neigh_resolve_output+0x5a5/0x970 [ 176.100333][ C0] ip6_finish_output2+0x1034/0x2520 [ 176.105604][ C0] ? ip6_mtu+0x2e6/0x460 [ 176.109844][ C0] ? ip6_forward_finish+0x530/0x530 [ 176.115027][ C0] ? lock_downgrade+0x920/0x920 [ 176.119868][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 176.126100][ C0] ? __kasan_check_read+0x11/0x20 [ 176.131126][ C0] __ip6_finish_output+0x444/0xa50 [ 176.136232][ C0] ? __ip6_finish_output+0x444/0xa50 [ 176.141681][ C0] ip6_finish_output+0x38/0x1f0 [ 176.146524][ C0] ip6_output+0x235/0x7c0 [ 176.150841][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 176.155944][ C0] ? __ip6_finish_output+0xa50/0xa50 [ 176.161234][ C0] ndisc_send_skb+0xf29/0x1450 [ 176.165995][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 176.171273][ C0] ? skb_set_owner_w+0x21b/0x320 [ 176.176199][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 176.181909][ C0] ndisc_send_ns+0x3a9/0x850 [ 176.186492][ C0] ? mark_held_locks+0xa4/0xf0 [ 176.191262][ C0] ? ndisc_netdev_event+0x4e0/0x4e0 [ 176.196503][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 176.201838][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 176.207045][ C0] ? trace_hardirqs_on+0x67/0x240 [ 176.212144][ C0] ? addrconf_dad_work+0xac4/0x1150 [ 176.217330][ C0] addrconf_dad_work+0xb88/0x1150 [ 176.222431][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 176.227974][ C0] process_one_work+0x9af/0x1740 [ 176.233344][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 176.238793][ C0] ? lock_acquire+0x190/0x410 [ 176.243573][ C0] worker_thread+0x98/0xe40 [ 176.248075][ C0] kthread+0x361/0x430 [ 176.252331][ C0] ? process_one_work+0x1740/0x1740 [ 176.257607][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 176.263842][ C0] ret_from_fork+0x24/0x30