Apache and PHP segfaults on Redhat EL5

Hello, I have been working over the last few months to try and get to the bottom of why our apache processes are regularly being killed with a Sig 11 (Segmentation Fault). Here are the messages in the kern.log httpd[22309]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21819]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[19168]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21597]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[22871]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[22090]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21970]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[22315]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21808]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21801]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[20469]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[23509]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21967]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21814]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[24017]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[21605]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[24329]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[23573]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[24328]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[22301]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[24636]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[25028]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[22869]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 httpd[25030]: segfault at 00007fffd01b4ffc rip 00002b1f935c064c rsp 00007fffd01b4f90 error 6 We literally have thousands of those, I have tracked it down as far as being caused by mod_php in apache (Redhat 5 update 5). However when I enabled coredump's in apache I don't get anything. I can however get a dump if I send a manual sig 11 to the process. Which brings me to my questions. Is there a method or way that I can enable a 'debug' mode in php which would help me track down and identify the root cause of these problems? If anyone has any suggestions on what I can do to try and get further down the track to enlightenment I would be really appreciated. Regards, Jimmy.