最近半年来莫名其妙就经常挂掉，系统shell也登不进去，只有ping有回应。
唯一的办法就是重启服务器。
察看服务器系统日志没有发现异常。
查看~bbs/tarce 发现死机前最后都有类似记录，求解

3月7日的：
[03/07 19:48:47  3868 5.system] (unknown user) www_guest lock for so long time!!!.
[03/07 19:48:51  3876 5.system] (unknown user) www_guest lock for so long time!!!.
[03/07 19:53:39  3983 5.system] (unknown user) www_guest lock for so long time!!!.
[03/07 19:54:05  4002 5.system] (unknown user) www_guest lock for so long time!!!.
[03/07 19:54:32  4028 5.system] (unknown user) www_guest lock for so long time!!!.

这个是昨天的，死机时间是2008-03-15 10:12:15
[2008-03-15 09:56:17 16048 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 09:56:17 16049 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 09:56:17 16050 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 09:59:35 16074 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 09:59:38 16089 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 10:08:07 16085 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 10:08:12 15577 5.system] (unknown user) www_guest lock for so long time!!!.
[2008-03-15 10:12:13 16207 5.system] (unknown user) www_guest lock for so long time!!!.
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FROM 222.172.221.*