apache 服务器老是 down 掉了

请各位大侠帮帮忙看看，

这里是 errer_log 文件死掉时所报的错。

日志报错如下。

[Tue Sep 21 11:33:22 2010] [alert] (11)资源暂时不可用: setuid: unable to change to uid: 99
[Tue Sep 21 11:33:22 2010] [alert] (11)资源暂时不可用: setuid: unable to change to uid: 99
[Tue Sep 21 11:33:22 2010] [alert] (11)资源暂时不可用: setuid: unable to change to uid: 99
[Tue Sep 21 11:33:22 2010] [alert] (11)资源暂时不可用: setuid: unable to change to uid: 99
[Tue Sep 21 11:33:22 2010] [alert] (11)资源暂时不可用: setuid: unable to change to uid: 99
[Tue Sep 21 11:33:22 2010] [alert] Child 20128 returned a Fatal error... Apache is exiting!
[Tue Sep 21 11:33:22 2010] [alert] (11)资源暂时不可用: setuid: unable to change to uid: 99
[Tue Sep 21 11:33:22 2010] [emerg] (43)标识符已删除: couldn't grab the accept mutex
[Tue Sep 21 11:33:22 2010] [emerg] (43)标识符已删除: couldn't grab the accept mutex
[Tue Sep 21 11:33:22 2010] [emerg] (43)标识符已删除: couldn't grab the accept mutex
[Tue Sep 21 11:33:22 2010] [emerg] (43)标识符已删除: couldn't grab the accept mutex
[Tue Sep 21 11:33:22 2010] [emerg] (43)标识符已删除: couldn't grab the accept mutex
[Tue Sep 21 11:33:22 2010] [emerg] (43)标识符已删除: couldn't grab the accept mutex
[Tue Sep 21 11:33:24 2010] [emerg] (22)无效的参数: couldn't grab the accept mutex
[Tue Sep 21 11:33:24 2010] [emerg] (22)无效的参数: couldn't grab the accept mutex

请好心人帮忙。

感谢 IBM 公司给出了说明
http://publib.boulder.ibm.com/httpserv/ihsdiag/errorlog.html