Description:
------------
The test suite freezes without alert the user.

TEST 15540/15558 [sapi/phpdbg/tests/run_001.phpt]

https://github.com/php/php-src/pull/2894

Even though the parameter register_argc_argv is setted On, the problem continues.

/home/vagrant/phptestfest-php-src/sapi/phpdbg/phpdbg -qIb -n -c '/home/vagrant/phptestfest-php-src/tmp-php.ini' -d "output_handler=" -d "open_basedir=" -d "disable_functions=" -d "output_buffering=Off" -d "error_reporting=32767" -d "display_errors=1" -d "display_startup_errors=1" -d "log_errors=0" -d "html_errors=0" -d "track_errors=0" -d "report_memleaks=1" -d "report_zend_debug=0" -d "docref_root=" -d "docref_ext=.html" -d "error_prepend_string=" -d "error_append_string=" -d "auto_prepend_file=" -d "auto_append_file=" -d "ignore_repeated_errors=0" -d "precision=14" -d "memory_limit=128M" -d "log_errors_max_len=0" -d "opcache.fast_shutdown=0" -d "opcache.file_update_protection=0" -d "zend.assertions=1" -d "extension_dir=/home/vagrant/phptestfest-php-src/modules/" -d "zend_extension=/home/vagrant/phptestfest-php-src/modules/opcache.so" -d "session.auto_start=0" -d "zlib.output_compression=Off" -d "mbstring.func_overload=0" -d "opcache.enable_cli=0" -d "register_argc_argv=On" -f "/home/vagrant/phptestfest-php-src/sapi/phpdbg/tests/run_001.php" -- 1 2 3
2>&1

Is it a bug in PHPDBG?

Test script:
---------------
sapi/phpdbg/tests/run_001.phpt

Actual result:
--------------
The test suites freezes