查到相关资料
查看 messages 日志
[root@10 ~ ]# less /var/log/messages
日志
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Jul 9 12:42:20 10 rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
解决方法
打开/etc/rsyslog.conf并找到 $ModLoad imklog
把他注释掉，然后重新启动rsyslog。现在CPU使用正常了，不再是100%。
CentOS6 重启方法
/etc/init.d/rsyslog restart
其它重启方法
systemctl restart rsyslog
参考：
https://isempty.me/archives/319
https://blog.csdn.net/younger_china/article/details/52355799
