VirtualBox装CentOS7启动问题

在Virtualbox中装入CentOS 7 ,启动非常慢，还会进入紧急模式，但还是可以进入系统，并且可以正常运行，相关错误及问题如下，

>>[michael@~]>>$ journalctl -p err

-- Logs begin at 一 2018-10-08 22:12:51 CST, end at 一 2018-10-08 22:24:10 CST. --

10月 08 22:14:35 localhost.localdomain systemd[1]: Timed out waiting for device dev-mapper-centosx2dhome.device.

10月 08 22:14:35 localhost.localdomain systemd[1]: Dependency failed for /home.

10月 08 22:14:35 localhost.localdomain systemd[1]: Dependency failed for Local File Systems.

10月 08 22:14:35 localhost.localdomain systemd[1]: Dependency failed for Mark the need to relabel after reboot.

10月 08 22:14:35 localhost.localdomain systemd[1]: Dependency failed for Relabel all filesystems, if necessary.

10月 08 22:14:35 localhost.localdomain systemd[1]: Dependency failed for Migrate local SELinux policy changes from the old store structure to

10月 08 22:16:07 localhost.localdomain systemd-udevd[516]: timeout '/usr/lib/systemd/systemd-vconsole-setup'

10月 08 22:16:07 localhost.localdomain kernel: NMI watchdog: BUG: soft lockup - CPU#1 stuck for 29s! [setfont:544]

10月 08 22:16:07 localhost.localdomain kernel: INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 0, t=61422 jiffies, g=1555, c=1

10月 08 22:16:07 localhost.localdomain kernel: All QSes seen, last rcu_sched kthread activity 61422 (4294833328-4294771906), jiffies_till_nex

10月 08 22:16:07 localhost.localdomain kernel: NMI watchdog: BUG: soft lockup - CPU#1 stuck for 29s! [setfont:544]

10月 08 22:16:07 localhost.localdomain systemd[1]: Failed to start udev Wait for Complete Device Initialization.

10月 08 22:18:06 localhost.localdomain spice-vdagent[11480]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0

10月 08 22:23:00 localhost.localdomain spice-vdagent[12141]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice.0

10月 08 22:23:21 localhost.localdomain pulseaudio[11984]: [pulseaudio] bluez5-util.c: GetManagedObjects() failed: org.freedesktop.DBus.Error.


>>[michael@~]>>$ systemd-analyze blame

     3min 8.399s lvm2-monitor.service

     3min 5.293s lvm2-pvscan@8:2.service

     1min 5.600s plymouth-quit-wait.service

         29.166s kdump.service

         20.665s vboxadd.service

         20.546s dev-mapper-centosx2dswap.swap

          7.520s tuned.service

          6.919s firewalld.service

          5.576s postfix.service

          4.849s ModemManager.service

请熟悉的网友给个解决问题的方向，学习谢谢！！！