compiled:
./configure && make && make install

script:
<?
function x(){
  x();
}
x();
?>

This little piece of code produces a SEGV. At some point the stack is full, and the program crashes. Why not die() before crashing?

OK, this code is so wrong... But still it should not SEGV.   
Discovered it on PHP 4.2.2 (apache mod) and especially built PHP 4.3.0RC3 (cmdline) to find that 4.3.0RC3 still does this.