First, install PHP debugging extensions for gdb, for example:
debuginfo-install php-5.6.8 # if you use yum
aptitude install php5-dbg # if you use aptitude
Then simply:
php_version=5.6.8
php_script_pid=$(pgrep -f $php_script_name)
curl https://raw.githubusercontent.com/php/php-src/PHP-$php_version/.gdbinit >> ~/.gdbinit
gdb -p $php_script_pid
dump_bt executor_globals.current_execute_data
This will print a stacktrace of PHP function calls.
In my case, I found out my drush command was stuck waiting for text from stdin, because I gave it the wrong cli flag: –y instead of -y.
...
You noticed the difference ? Yes, it's subttle and god damn confusing: the first argument contains the unicode character EN-DASH.
