httpd: *** glibc detected *** free(): invalid next size (f..

HI,

relevant info:

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(/var/log/httpd) # cat /etc/redhat-release
Red Hat Enterprise Linux ES release 4 (Nahant Update 4)
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(/var/log/httpd) # rpm -q httpd
httpd-2.0.52-28.ent

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rpm -q php
php-5.1.6-1

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(/var/log/httpd) # rpm -q glibc
glibc-2.3.4-2.25

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The issue is /var/log/httpd/error_log is full of errors:



*** glibc detected *** free(): invalid next size (fast): 0x085920e8
***
[Wed Feb 14 17:32:15 2007] [notice] child pid 25372 exit signal
Aborted (6)
*** glibc detected *** free(): invalid next size (fast): 0x08073d58
***
[Wed Feb 14 17:32:34 2007] [notice] child pid 25650 exit signal
Aborted (6)
*** glibc detected *** free(): invalid next size (fast): 0x08388d50
***
[Wed Feb 14 17:32:35 2007] [notice] child pid 24850 exit signal
Aborted (6)
*** glibc detected *** free(): invalid next size (fast): 0x08348700
***
[Wed Feb 14 17:34:09 2007] [notice] child pid 23952 exit signal
Aborted (6)
*** glibc detected *** free(): invalid next size (fast): 0x0891a058
***
[Wed Feb 14 17:34:31 2007] [notice] child pid 22369 exit signal
Aborted (6)

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has anyone seen this before, if not what would be the proper steps to
debug the issue

Thanks
fr