日志看起来像这样：

Aug 24 10:02:04 Ubuntu-1404-trusty-64-minimal kernel: [ 2046.519099] perf    interrupt took too long (2505 > 2500),lowering kernel.perf_event_max_sample_rate to 50000
Aug 24 10:03:19 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 43 of user ubuntu.
Aug 24 10:06:21 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 44 of user ubuntu.
Aug 24 10:06:22 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 45 of user ubuntu.
Aug 24 10:08:14 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 46 of user ubuntu.
Aug 24 10:17:01 Ubuntu-1404-trusty-64-minimal CRON[150011]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Aug 24 10:20:11 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 48 of user ubuntu.
Aug 24 10:26:28 Ubuntu-1404-trusty-64-minimal systemd[1]: Started Session 49 of user ubuntu.
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@

只有连接了SSD磁盘的计算机才会出现此问题.

检查内存和磁盘,100％确定.

问题只发生在ubuntu 16.04上.

Ubuntu 14.04 LTS不会遇到这个问题.

所以这肯定是一些软件错误.这里的问题是：可以采取什么行动来解决这个问题？我们应该启用哪些日志/调试才能到达底部？