Failed opening required index.php

[dasj19]

Hello, after I saw your demo I thought to give your software a try.
So I went on into configuring a KVM virtual machine where I mounted the folder containing a drupal installation into the virtual machine at /srv/www/drupal/current.
The mount command I use is: mount -t 9p -o trans=virtio,version=9p2000.L /drupal /srv/www/drupal/current
The site works using the nginx server.

When I run:
dontbug record /srv/www/drupal/current --server-listen=myhostname

I get the following errors:

PHP Warning: Unknown: failed to open stream: Interrupted system call in Unknown on line 0
PHP Fatal error: Unknown: Failed opening required '/srv/www/drupal/current/index.php' (include_path='.:/usr/share/path') in Unknown on line 0

And nother thing. How did you get your drupal installation to work?
When I try to run the php built-in server it always executes the index.php saying that the path is not found. I tryied also with different drupal router.php files I found on the web but with no luck.
The command I use to test is:
php -S myhostname:8088

Any help is highly appreciated.