[CentOS] CentOS or PHP or Apache Bug?

[David]

Dear all,
I've IBM X3250 and CentOS 5.4 x86_64, HTTPD, PHP already installed,

Feb 18 18:35:02 ext-fw kernel: php[2933]: segfault at 00007fff7f03bfe8 
rip 000000000056ed70 rsp 00007fff7f03c018 error 6
Feb 18 18:40:01 ext-fw kernel: php[2950]: segfault at 00007fff6005cf58 
rip 00000000005a9155 rsp 00007fff6005cf60 error 6
Feb 18 18:41:06 ext-fw kernel: httpd[2967]: segfault at 00007fffac4898d8 
rip 00002b706e527795 rsp 00007fffac4898e0 error 6
Feb 18 18:41:06 ext-fw kernel: httpd[2968]: segfault at 00007fffac4898d8 
rip 00002b706e527795 rsp 00007fffac4898e0 error 6
Feb 18 18:41:07 ext-fw kernel: httpd[2969]: segfault at 00007fffac4898d8 
rip 00002b706e527795 rsp 00007fffac4898e0 error 6
Feb 18 18:41:10 ext-fw kernel: httpd[2971]: segfault at 00007fffac4898d8 
rip 00002b706e527795 rsp 00007fffac4898e0 error 6
Feb 18 18:41:11 ext-fw kernel: httpd[2973]: segfault at 00007fffac4898d8 
rip 00002b706e527795 rsp 00007fffac4898e0 error 6
Feb 18 18:41:12 ext-fw kernel: httpd[2972]: segfault at 00007fffac4898d8 
rip 00002b706e527795 rsp 00007fffac4898e0 error 6

I want to setup cacti as network monitoring, but when I trying to 
accessed this server I'm getting error message on browser (firefox) 
connect trought proxy:

*Invalid Response* error was encountered while trying to process the 
request:

    GET /cacti/ HTTP/1.1
    Host: ext-fw.lerindro.co.id
    User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100214 Ubuntu/9.10 (karmic) Firefox/3.5.8
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Language: en-us,en;q=0.5
    Accept-Encoding: gzip,deflate
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Keep-Alive: 300
    Connection: keep-alive

The HTTP Response message received from the contacted server could not 
be understood or was otherwise malformed. Please contact the site operator.

So, please tell my how to fix this "Bug"?

Warm regards,
David