This function call causes frequent segmentation fault + core on Apache 1.3.2x + PHP 4.1.x (all versions => 4.1.0)

function StartMySession() {
                srand((double) microtime() * 1000000); 
                $hash = bin2hex(mhash(MHASH_MD5, rand(1, time()) . microtime(), 'public_identificator'));
                session_id($hash);
                session_name($this->globalName);                session_set_cookie_params($this->globalTime, '/', '.my.domain');
                session_start();
                $sessionID = session_id();
                $GLOBALS[$this->varControlName] = true;
                session_register($this->varControlName);
                return $sessionID;
        }

  PHP compiled as Apache module:
--with-gd=../gd-1.8.4 \
--with-oci8 \
--enable-sigchild \
--enable-ftp \
--with-mysql \
--with-xml \
--enable-track-vars \
--enable-sysvsem \
--enable-sysvshm \
--enable-trans-sid \
--enable-gd-native-ttf \
--with-ttf=../freetype-2.0.8 \
--with-jpeg-dir=/usr/lib \
--with-zlib-dir=/usr/lib \
--with-png-dir=/usr/lib \
--with-mhash