From: jr-php2 at quo dot to Operating system: Red Hat Linux 9.0, kernel 2.4.21 PHP version: 4.3.2 PHP Bug Type: Program Execution Bug description: proc_open() leaves zombie processes if user cancels page load
Description: ------------ Apache version: 1.3.28 PHP version: 4.3.2, used as a CGI binary: ./configure --prefix=/usr/local/php-cgi --enable-track-vars --with-mysql --with-zlib --enable-discard-path I have found that if page loading is cancelled by the user (e.g. by closing the Internet Explorer window) before fclose() & proc_close() are called, a zombie process is left behind. Try the code below (save it as 'testx.cgi'). During normal execution, you'll see this: 27551 ? S 0:00 /usr/local/php-cgi/bin/php testx.cgi 22800 ? Z 0:00 [ls <defunct>] If you let the page load completely, both processes go away from the process list. If, however, you close the browser window before the sleep() call finishes, about 70% of the time a zombie process is left behind: 27551 ? Z 0:00 [testx.cgi <defunct>] I have to restart Apache (1.3.28) to kill this process. Reproduce code: --------------- #!/usr/local/php-cgi/bin/php <?php $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("file", "/dev/null", "a"), // stderr is a file to write to ); $process = proc_open('/bin/ls -al /tmp', $descriptorspec, $pipes); if (!is_resource($process)) die("Error: proc_open failed"); sleep(10); fclose($pipes[0]); fpassthru($pipes[1]); fclose($pipes[1]); proc_close($process); ?> Expected result: ---------------- There should be no zombie process left over when the user cancels the page load. -- Edit bug report at http://bugs.php.net/?id=24858&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=24858&r=trysnapshot4 Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=24858&r=trysnapshot5 Fixed in CVS: http://bugs.php.net/fix.php?id=24858&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=24858&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=24858&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=24858&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=24858&r=support Expected behavior: http://bugs.php.net/fix.php?id=24858&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=24858&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=24858&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=24858&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=24858&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=24858&r=dst IIS Stability: http://bugs.php.net/fix.php?id=24858&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=24858&r=gnused