Bug #69014 [Opn->Fbk]: proc_close and proc_get_status returns NULL. Zombies remain in process-list

Edit report at https://bugs.php.net/bug.php?id=69014&edit=1 ID: 69014 Updated by: joey@php.net Reported by: f0o at devilcode dot org Summary: proc_close and proc_get_status returns NULL. Zombies remain in process-list -Status: Open +Status: Feedback Type: Bug Package: Program Execution Operating System: Gentoo 2.2, Debian Jessie PHP Version: 5.5.21 Block user comment: N Private report: N New Comment: Not enough information was provided for us to be able to handle this bug. Please re-read the instructions at http://bugs.php.net/how-to-report.php If you can provide more information, feel free to add it to this bug and change the status back to "Open". Thank you for your interest in PHP. I have been unable to duplicate this bug on Debian Jessie with PHP 5.6.5 (5.6.5+dfsg-1), 5.5.21 built from source, nor 5.5.9 from Ubuntu packages. Previous Comments: ------------------------------------------------------------------------ [2015-02-08 15:37:17] f0o at devilcode dot org Description: ------------ 'proc_get_status' and 'proc_close' return 'NULL' and leave the process as defunct/Zombie in the process-list. The process has no open files and is verified to be terminated in execution. PHP Versions 5.5.21 and 5.6.5 are affected. PHP Versions 5.4.37 is NOT affected. The bug was noticed under Gentoo 2.2 and verified under Debian Jessie. Gentoo has been used to isolate the affected versions as it guarantees an equal build-environment for all php-installations and allows to 'hotswap' the versions at any given time. All tests have been conducted with PHP-FPM under Nginx. Version of Nginx has no influence on the bug. Test script: --------------- <?php function pipe_open(&$process, &$pipes) { $command = "/bin/date +%s"; $descriptorspec = array( 0 => array("pipe", "r"), // stdin is a pipe that the child will read from 1 => array("pipe", "w"), // stdout is a pipe that the child will write to 2 => array("pipe", "w") // stderr is a pipe that the child will write to ); $cwd = '/'; $env = array(); $process = proc_open($command, $descriptorspec, $pipes, $cwd, $env); var_dump("Proc:"); var_dump($process); var_dump("Status:"); var_dump(proc_get_status($process)); stream_set_blocking($pipes[1], 0); stream_set_blocking($pipes[2], 0); if( is_resource($process) ) { return true; } } function pipe_close($process, &$pipes) { fclose($pipes[0]); fclose($pipes[1]); fclose($pipes[2]); var_dump("Status:"); var_dump(proc_get_status($process)); $return_value = proc_close($process); var_dump("RetVal:"); var_dump($return_value); var_dump("Proc:"); var_dump($process); return $return_value; } function test($param) { pipe_open($process, $pipes); if( is_resource($process) ) { fwrite($pipes[0], $param); fclose($pipes[0]); while( strlen($line) < 1 ) { $line = fgets($pipes[1],1024); $data .= $line; } $return_value = pipe_close($process, $pipes); return $data; } else { return 0; } } var_dump(test("")); ?> Expected result: ---------------- string(5) "Proc:" resource(5) of type (process) string(7) "Status:" array(8) { ["command"]=> string(13) "/bin/date +%s" ["pid"]=> int(30731) ["running"]=> bool(true) ["signaled"]=> bool(false) ["stopped"]=> bool(false) ["exitcode"]=> int(-1) ["termsig"]=> int(0) ["stopsig"]=> int(0) } string(7) "Status:" array(8) { ["command"]=> string(13) "/bin/date +%s" ["pid"]=> int(30731) ["running"]=> bool(true) ["signaled"]=> bool(false) ["stopped"]=> bool(false) ["exitcode"]=> int(-1) ["termsig"]=> int(0) ["stopsig"]=> int(0) } string(7) "RetVal:" int(0) string(5) "Proc:" resource(5) of type (Unknown) string(11) "1423408318 " Actual result: -------------- string(5) "Proc:" resource(5) of type (process) string(7) "Status:" NULL string(7) "Status:" NULL string(7) "RetVal:" NULL string(5) "Proc:" resource(5) of type (process) string(11) "1423408318 " ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69014&edit=1