Description:
------------
Steps:
1. exec via browser PHP 7.1 test script. (PHP work via nginx as php-cgi.exe)

Using WTServer (https://wtserver.wtriple.com/)
PHP VC14 x64 Non Thread Safe

Test script:
---------------
#!/usr/bin/env php
<?
	if (!defined("STDERR"))
		define("STDERR", fopen("php://stderr", "w"));

	for ($i=0; $i<256; $i++)
		fprintf(STDERR, "Missing some file\n");

	print "done.";
?>

Expected result:
----------------
#!/usr/bin/env php
done.

Actual result:
--------------
freeze on 227 iteration. 4k buffer overflow?

Plus if decrease count of iterations, string "#!/usr/bin/env php" sometimes output, sometimes not after each re-save the file.