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]: T
imed 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！！！
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