Description:
------------
I'm getting a SIGSEGV using the following php :

# php -v
PHP 5.4.27-pl0-gentoo (cli) (built: May  2 2014 00:33:46) (DEBUG)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

Build options :

./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --prefix=/usr/lib64/php5.4 --mandir=/usr/lib64/php5.4/man --infodir=/usr/lib64/php5.4/info --libdir=/usr/lib64/php5.4/lib --with-libdir=lib64 --without-pear --disable-maintainer-zts --disable-bcmath --with-bz2=/usr --disable-calendar --enable-ctype --with-curl=/usr --without-curlwrappers --enable-dom --without-enchant --enable-exif --enable-fileinfo --enable-filter --disable-ftp --without-gettext --without-gmp --enable-hash --without-mhash --with-iconv --disable-intl --enable-ipv6 --enable-json --without-kerberos --enable-libxml --with-libxml-dir=/usr --enable-mbstring --with-mcrypt=/usr --without-mssql --with-onig=/usr --with-openssl=/usr --with-openssl-dir=/usr --enable-pcntl --enable-phar --enable-pdo --without-pgsql --enable-posix --without-pspell --without-recode --enable-simplexml --disable-shmop --without-snmp --disable-soap --disable-sockets --with-sqlite3=/usr --without-sybase-ct --disable-sysvmsg --disable-sysvsem --disable-sysvshm --without-fpm-systemd --without-tidy --enable-tokenizer --disable-wddx --enable-xml --enable-xmlreader --enable-xmlwriter --with-xmlrpc --with-xsl=/usr --disable-zip --with-zlib=/usr --enable-debug --without-cdb --without-db4 --disable-flatfile --without-gdbm --disable-inifile --without-qdbm --with-freetype-dir=/usr --with-t1lib=/usr --disable-gd-jis-conv --with-jpeg-dir=/usr --with-png-dir=/usr --without-xpm-dir --with-gd --with-mysql=mysqlnd --with-mysql-sock=/var/run/mysqld/mysqld.sock --with-mysqli=mysqlnd --without-pdo-dblib --with-pdo-mysql=mysqlnd --without-pdo-pgsql --with-pdo-sqlite=/usr --without-pdo-odbc --with-readline=/usr --without-libedit --without-mm --with-pic --with-pcre-regex=/usr --with-pcre-dir=/usr --with-config-file-path=/etc/php/cli-php5.4 --with-config-file-scan-dir=/etc/php/cli-php5.4/ext-active --disable-embed --enable-cli --disable-cgi --disable-fpm --without-apxs2

Using drupal 7.23, 7.x-1.5 entity module.

Program received signal SIGSEGV, Segmentation fault.
0x0000555555a5b673 in realpath_cache_key (path=<error reading variable: Cannot access memory at address 0x7fffff7feff8>,
    path_len=<error reading variable: Cannot access memory at address 0x7fffff7feff4>)
    at /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/TSRM/tsrm_virtual_cwd.c:578
578     {
#0  0x0000555555a5b673 in realpath_cache_key (path=<error reading variable: Cannot access memory at address 0x7fffff7feff8>,
    path_len=<error reading variable: Cannot access memory at address 0x7fffff7feff4>)
    at /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/TSRM/tsrm_virtual_cwd.c:578
        h = 44424
        e = 0x0


Expected result:
----------------
I should expect a 'Allowed memory size exhausted' or another error, but a SEGV.

Actual result:
--------------
Full backtrace can be found here (25MB) : http://people.meleeweb.net/~beber/triskel/wwwdev.gdb.txt

This is reproducible using apache or cli SAPI with php 5.4.27 and 5.5.10

I seems that an infinite loop is present that lead to memory exhausting. gdb backtrace has 48350 frames.

# grep '^#' gdb.txt | awk '{print $4}' | sort | uniq -c | sort -bg
      1 ZEND_INCLUDE_OR_EVAL_SPEC_CV_HANDLER
      1 do_cli
      1 main
      1 phar_find_in_include_path
      1 phar_resolve_path
      1 php_execute_script
      1 php_resolve_path
      1 php_resolve_path_for_zend
      1 realpath_cache_find
      1 realpath_cache_key
      1 tsrm_realpath
      1 virtual_file_ex
      1 zend_execute_scripts
      2 tsrm_realpath_r
   9667 ZEND_DO_FCALL_SPEC_CONST_HANDLER
   9667 zend_call_function
   9667 zend_do_fcall_common_helper_SPEC
   9667 zif_call_user_func_array
   9668 execute

# grep '^#' gdb.txt | awk '{if ($6 == "at") {print $7}}' | sort | uniq -c | sort -bg
      1 /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/main/main.c:2502
   9668 /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/Zend/zend_vm_execute.h:410