Apache 2 Segfault with PHP on any signal

I got segfault on apache when php installed. Apache 2.0.46 + PHP 4.3.3-RC1 + RH9 + Linux 2.4.21 My apache server segfault each time it receive a signal (SIGUSR1 or SIGHUP or example). Therefore, apache core at log rotation. I got in error log : "[notice] seg fault or similar nasty error detected in the parent process" If a remove the line "LoadModule php4_module modules/libphp4.so" from my httpd.conf, apache DON'T core any more. More, if I use the standard Redhat 9 kernel, every thing is Ok, but as soon as I use my own kernel (2.4.20 or 2.4.21) the problem comes out. My kernel works fine with any other applications or services. I have the same problem - with Apache 2.0.44, 2.0.45 or 2.0.46 - with PHP 4.3.1, 4.3.2, 4.3.3-RC1 or CVS-STABLE, - with a custom 2.4.20 or 2.4.21 kernel (but not with standard RH9 kernel !!!). strace doesn't give any revelant information. I have done lot of search, read apache and PHP mailing list and bugs report. I found some people with the exactly the same problem but none got solutions! Is there any incompatibility beetween some compilation of Linux kernel and PHP ? Thanks for _any_ help Nicolas PS : my php configuration : ./configure --with-mysql --with-ldap --with-gettext --enable-force-cgi-redirec t --with-apxs2=/path_to_apache2/bin/apxs --enable-track-vars --with-config-fil e-path=/etc my apache 2 conf ./configure --prefix=/tmp/apache2 --libdir=/lib --with-mpm=prefork \ --disable-v4-mapped --enable-access --enable-auth --enable-auth-anon --disable-auth-dbm --disable-auth-digest --disable-isapi --disable-file-cach e --disable-echo --disable-charset-lite --disable-cache --disable-disk-cache \ --disable-mem-cache --disable-example --disable-case-filter --disable-case-f ilter-in \ --disable-ldap --disable-auth-ldap --disable-ext-filter --disable-include \ --enable-deflate --enable-log-config --enable-logio --disable-env \ --disable-mime-magic --disable-cern-meta --enable-expires --disable-headers \ --disable-usertrack --disable-unique-id --enable-setenvif --enable-proxy \ --disable-proxy-connect --disable-proxy-ftp --enable-proxy-http --enable-ssl \ --disable-optional-hook-export --disable-optional-hook-import \ --disable-optional-fn-import --disable-optional-fn-export \ --enable-bucketeer --enable-static-support --enable-static-htpasswd \ --enable-static-htdigest --enable-static-rotatelogs --enable-static-logresol ve \ --enable-static-htdbm --enable-static-ab --enable-static-checkgid \ --enable-http --enable-mime --disable-dav --enable-status \ --disable-autoindex --disable-asis --enable-info --disable-suexec \ --enable-cgi --disable-cgid --disable-dav-fs --enable-vhost-alias \ --disable-negotiation --enable-dir --disable-imap --disable-actions \ --disable-speling --disable-userdir --enable-alias --enable-rewrite \ --enable-so