Here's a short script (the cause of the beginning) :
<?
  umask(000);
  mkdir("drawer/$newdir",0777);
?>

When this is done (this code is simplified) the file is owned by user nobody and group #-1 ...

Here's the configure line : 
'./configure' '--with-apxs=/usr/local/apache/bin/apxs' '--enable-inline-optimization' '--enable-debug=no' '--enable-safe-mode' '--enable-calendar' '--enable-sysvsem' '--enable-sysvshm' '--enable-trans-sid' '--disable-static' '--with-regex=system' '--with-mysql=/usr/local/mysql' '--with-freetype-dir=/usr' '--with-gd=/usr' '--enable-gd-native-tt' '--enable-freetype-4bit-antialias-hack' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--with-tiff-dir=/usr' '--with-zlib=/usr' '--with-pdflib=/usr'

I'm running Zend optimiser V1.2.0

This script was running as a module from Apache V1.3.20 (apache user : nobody, group : nobody).

I didn't test if this bug is also on other systems (I've only RedHat7.x servers, but only one that can run Apache, the others has their respective tasks).

I didn't compile PHP with the --enable-debug then I'm not able to give the gdb backtrace (?) ...