See T247587#6306855 for a workaround.
Without xdebug:
vagrant@vagrant:~$ echo ';' | time mwscript eval.php 0.12user 0.04system 0:00.23elapsed 73%CPU (0avgtext+0avgdata 46968maxresident)k 0inputs+16outputs (0major+8104minor)pagefaults 0swaps
With xdebug:
vagrant@vagrant:~$ echo ';' | time mwscript eval.php PHP Warning: require(/vagrant/mediawiki/includes/debug/logger/monolog/LogstashFormatter.php): failed to open stream: Too many open files in /vagrant/mediawiki/includes/AutoLoader.php on line 109 [snip; trace is something like eval.php -> Setup.php -> ExtensionRegistry::getCache -> ObjectCache -> LoggerFactory -> MonologSpi, so pretty early on in the setup] Command exited with non-zero status 255 1.22user 2.81system 0:23.61elapsed 17%CPU (0avgtext+0avgdata 173928maxresident)k 0inputs+95288outputs (0major+39738minor)pagefaults 0swaps
The error can be avoided by raising ulimit (which is 1024 by default), but then it just hangs forever.
(Note also the huge difference in outputs - 16 vs. 95288.)
A simple non-MediaWiki test:
vagrant@vagrant:~$ for i in {1..1100}; do echo -e '<?php\nreturn '$i';' > script$i.php; done
vagrant@vagrant:~$ cat > script.php
<?php
for ($i = 1; $i<=1100; $i++) {
require "script$i.php";
}
vagrant@vagrant:~$ xdebug_off
vagrant@vagrant:~$ /usr/bin/time php script.php
0.04user 0.02system 0:00.08elapsed 85%CPU (0avgtext+0avgdata 28496maxresident)k
1544inputs+0outputs (0major+3431minor)pagefaults 0swaps
vagrant@vagrant:~$ xdebug_on
vagrant@vagrant:~$ /usr/bin/time php script.php
0.45user 1.44system 0:12.50elapsed 15%CPU (0avgtext+0avgdata 97904maxresident)k
0inputs+46712outputs (0major+20740minor)pagefaults 0swapsthat's about 10ms per file opened, and about 4000 outputs (whatever those are) per require.
(Note that this is in the vagrant user's home directory. So, not an NFS / shared folder issue, or at least not straightforwardly.)
vagrant@vagrant:~$ php --version
PHP 7.2.26-1+0~20191218.33+debian9~1.gbpb5a340+wmf1 (cli) (built: Jan 9 2020 12:24:18) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.26-1+0~20191218.33+debian9~1.gbpb5a340+wmf1, Copyright (c) 1999-2018, by Zend Technologies
with Xdebug v2.7.0, Copyright (c) 2002-2019, by Derick RethansNothing obviously related in the 2.7 release notes (not sure if it's specific to that release, anyway).