[PHP-BUG] Bug #71209 [NEW]: php-cgi script hangs when started from php-fpm via system(), passthru() etc.

From:             lameventanas at gmail dot com
Operating system: Linux
PHP version:      5.6.16
Package:          Scripting Engine problem
Bug Type:         Bug
Bug description:php-cgi script hangs when started from php-fpm via system(), passthru() etc.

Description:
------------
My lighttpd server uses fastcgi to run php code.

The php code starts an external program that happens to be a standalone
php script (shebang: #!/usr/bin/php-cgi).

The script hangs when started from a php-fpm process manager, but works
fine when started from a php-cgi "process manager".

Just to clarify, the process that hangs is the php-cgi which is
interpreting the standalone script.  If I replace this with a
shellscript, everything works fine.

Test script:
---------------
test.php:
<?
header("Content-type: text/plain");
echo "Starting\n";
system("/var/www/htdocs/script.php");
echo "Finished\n";
?>

script.php:
#!/usr/bin/php-cgi -q
<?
echo "Hello world!\n";
?>


Expected result:
----------------
No hangs.


-- 
Edit bug report at https://bugs.php.net/bug.php?id=71209&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=71209&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=71209&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=71209&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=71209&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=71209&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=71209&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=71209&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=71209&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=71209&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=71209&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=71209&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=71209&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=71209&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71209&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=71209&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=71209&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=71209&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=71209&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=71209&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=71209&r=mysqlcfg