ID: 24858 User updated by: jr-php2 at quo dot to Reported By: jr-php2 at quo dot to -Status: Open +Status: Bogus Bug Type: Program Execution Operating System: Red Hat Linux 9.0, kernel 2.4.21 PHP Version: 4.3.3RC2-dev New Comment:
Good news: I found I couldn't reproduce the problem after downgrading Apache to 1.3.27. Then I came across this bug report for Apache 1.3.28: http://nagoya.apache.org/bugzilla/show_bug.cgi?id=21737 I applied the second patch there, and so far haven't had any more lingering zombie processes. Why I could only reproduce the problem when I used proc_open() remains a mystery... Sorry for the false alarm. Previous Comments: ------------------------------------------------------------------------ [2003-07-30 02:42:52] jr-php2 at quo dot to Same problem exists in php4-STABLE-200307300530. ------------------------------------------------------------------------ [2003-07-30 02:11:46] [EMAIL PROTECTED] Please try using this CVS snapshot: http://snaps.php.net/php4-STABLE-latest.tar.gz For Windows: http://snaps.php.net/win32/php4-win32-STABLE-latest.zip ------------------------------------------------------------------------ [2003-07-29 14:36:01] jr-php2 at quo dot to FYI, I tried adding a "ignore_user_abort(1);" call to the top of the script but it did not help. I guess ignore_user_abort() probably has no effect when PHP is used as a CGI binary? ------------------------------------------------------------------------ [2003-07-29 13:51:05] jr-php2 at quo dot to 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 this bug report at http://bugs.php.net/?id=24858&edit=1
