Description:
------------
On a Linux x86_64 system, "make test" stalls at:
TEST 1526/11661 [Zend/tests/debug_info.phpt]

with 99% CPU.

./configure --with-apxs2=/usr/local/apache2/bin/apxs \
         --with-libdir=lib64 \
         --disable-debug \
         --enable-calendar \
         --with-gd=shared \
         --with-freetype-dir \
         --with-mysql=shared,mysqlnd \
         --with-mysqli=shared,mysqlnd \
         --with-regex=php \
         --with-png-dir=/usr/lib \
         --with-zlib=shared \
         --with-iconv=shared \
         --enable-ftp \
         --with-mcrypt=shared \
         --with-bz2=shared \
         --enable-zip \
         --with-jpeg-dir=/usr/lib \
         --enable-mbstring \
         --enable-dom \
         --enable-json \
         --with-pdo-mysql=mysqlnd \
         --with-pear \
         --enable-bcmath \
         --with-curl=shared \
         --with-ldap=shared,/usr \
         --with-gettext=shared \
         --with-snmp=shared \
         --enable-soap \
         --enable-sockets

Expected result:
----------------
"make test" completion