Description:
------------
The httpd child crashes whilst stepping through php code using DBG as debug module.  As soon as the first variable assignment is reached, it segfaults (11)

DBG php debugger, version 2.16.20, Copyright 2001, 2005 Dmitri Dmitrienko, http://www.nusphere.com/dbg

Version 	2.16.20
Linked 	as a shared library.
Dbg security 	enabled.
Profiler 	compiled, enabled
Target PHP version 	5.1.2
Server API 	Apache 2.0 Handler
Extensions API 	220051025
Modules API 	20050922
PHP API 	20041225



'./configure' '--disable-debug' '--with-pic' '--with-config-file-scan-dir=/usr/local/etc/php.d' '--disable-rpath' '--without-pear' '--with-bz2' '--with-curl' '--with-freetype-dir=/usr' '--with-png-dir=/usr' '--enable-gd-native-ttf' '--without-gdbm' '--with-gettext' '--with-gmp' '--with-iconv' '--with-jpeg-dir=/usr' '--with-openssl' '--with-png' '--with-pspell' '--with-expat-dir=/usr' '--with-pcre-regex=/usr' '--with-zlib' '--with-layout=GNU' '--enable-dom=shared' '--enable-exif' '--enable-ftp' '--enable-magic-quotes' '--enable-sockets' '--enable-sysvsem' '--enable-sysvshm' '--enable-sysvmsg' '--enable-track-vars' '--enable-trans-sid' '--enable-yp' '--enable-wddx' '--with-kerberos' '--enable-ucd-snmp-hack' '--with-unixODBC=shared,/usr' '--enable-memory-limit' '--enable-shmop' '--enable-calendar' '--enable-dbx' '--enable-dio' '--with-mime-magic=/usr/local/apache2/conf/magic' '--without-sqlite' '--with-libxml-dir=/usr' '--with-xml' '--enable-force-cgi-redirect' '--enable-pcntl' '--with-imap=shared' '--with-imap-ssl' '--enable-mbstring=shared' '--enable-mbstr-enc-trans' '--enable-mbregex' '--with-ncurses=shared' '--with-gd=shared' '--enable-bcmath=shared' '--enable-dba=shared' '--with-db4=/usr' '--with-xmlrpc=shared' '--with-ldap=shared' '--with-mysql=shared,/usr' '--with-mysqli=shared,/usr/bin/mysql_config' '--with-dom-xslt=/usr' '--with-dom-exslt=/usr}' '--with-pgsql=shared' '--with-snmp=shared,/usr' '--enable-soap=shared' '--with-xsl=shared,/usr' '--enable-xmlreader=shared' '--enable-xmlwriter=shared' '--enable-fastcgi' '--enable-pdo=shared' '--with-pdo-odbc=shared,unixODBC,/usr' '--with-pdo-mysql=shared,/usr' '--with-pdo-pgsql=shared,/usr' '--with-pdo-sqlite=shared,/usr' '--with-apxs2=/usr/local/apache2/bin/apxs'


Reproduce code:
---------------
<?php
print("this works");
echo "and this";
$error="segfault when here";
?>

Expected result:
----------------
Stepping till end.

Actual result:
--------------
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208199504 (LWP 13969)]
0x01188435 in zend_assign_to_variable (result=0x909bcd0, op1=0x909bce4,
    op2=0x909bcf8, value=0x909bcfc, type=1, Ts=0xbf9e1bf0)
    at /data/misc/download/Download_spool/php-5.1.2/Zend/zend_execute.c:269
269             zval ***ptr = &CV_OF(node->u.var);