WSOD when a virtual server is created in Apache mod_php mode

We've configured Virtualmin to create virtual servers in Apache mod_php mode. Strange enough that after a virtual server is created it shows WSOD in browser. However, switching the "PHP script execution mode" option to FCGId mode starts showing the website correctly. Switching back to "Apache mod_php" shows website normally. But we really can not be switching to FCGId to only switch back to Apache mod_php constantly.

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If it is relevant Apache listens to port 8080 on this server. And the /var/log/httpd/error_log is outputting the following lines during creation of a virtual server:

[Tue May 12 05:42:50.943355 2015] [core:notice] [pid 4071] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND' [Tue May 12 05:43:03.800245 2015] [mpm_prefork:notice] [pid 4071] AH00171: Graceful restart requested, doing restart [Tue May 12 05:43:04.134624 2015] [auth_digest:notice] [pid 4071] AH01757: generating secret for digest authentication ... [Tue May 12 05:43:04.139756 2015] [lbmethod_heartbeat:notice] [pid 4071] AH02282: No slotmem from mod_heartmonitor [Tue May 12 05:43:04.281824 2015] [mpm_prefork:notice] [pid 4071] AH00163: Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips mod_fcgid/2.3.9 PHP/5.4.16 SVN/1.7.14 configured -- resuming normal operations <code>

Howdy -- it sounds like you're saying that you get a white screen when using mod_php, but switching to FCGID and then back to mod_php corrects the issue?

What error shows up in the Apache error logs for the domain, located in /home/username/logs/error_log?

Also, does the same issue occur using different web content?

For example, what if you just add a test.php file, containing the following content:

<?php phpinfo(); ?>

Do you see the same issue with that?

The /home/username/logs/error_log file is empty, otherwise I would post its content with initial report. That's why I had to go for /var/log/httpd/error_log. Further findings about the issue is that it gives completely scattered page for phpMymyAdmin or any other script to be created in Apache mod_php mode. Switching to FCGID and back to mod_php fixes it. For example, I tried to install RoundCube in Apache mod_php mode just to see this in browser:

| | Author: Aleksander Machniak | +-------------------------------------------------------------------------+ */ // include environment require_once 'program/include/iniset.php'; // init application, start session, init output class, etc. $RCMAIL = rcmail::get_instance($GLOBALS['env']); // Make the whole PHP output non-cacheable (#1487797) $RCMAIL->output->nocacheing_headers(); $RCMAIL->output->common_headers(); // turn on output buffering ob_start(); // check if config files had errors if ($err_str = $RCMAIL->config->get_error()) { rcmail::raise_error(array( 'code' => 601, 'type' => 'php', 'message' => $err_str), false, true); } // check DB connections and exit on failure if ($err_str = $RCMAIL->db->is_error()) { rcmail::raise_error(array( 'code' => 603, 'type' => 'db', 'message' => $err_str), FALSE, TRUE); } // error steps if ($RCMAIL->action == 'error' && !empty($_GET['_code'])) { rcmail::raise_error(array('code' => hexdec($_GET['_code'])), FALSE, TRUE); } // check if https is required (for login) and redirect if necessary if (empty($_SESSION['user_id']) && ($force_https = $RCMAIL->config->get('force_https', false))) { $https_port = is_bool($force_https) ? 443 : $force_https; if (!rcube_utils::https_check($https_port)) { $host = preg_replace('/:[0-9]+$/', '', $_SERVER['HTTP_HOST']); $host .= ($https_port != 443 ? ':' . $https_port : ''); header('Location: https://' . $host . $_SERVER['REQUEST_URI']); exit; } } // trigger startup plugin hook $startup = $RCMAIL->plugins->exec_hook('startup', array('task' => $RCMAIL->task, 'action' => $RCMAIL->action)); $RCMAIL->set_task($startup['task']); $RCMAIL->action = $startup['action']; // try to log in if ($RCMAIL->task == 'login' && $RCMAIL->action == 'login') { $request_valid = $_SESSION['temp'] && $RCMAIL->check_request(); // purge the session in case of new login when a session already exists $RCMAIL->kill_session(); $auth = $RCMAIL->plugins->exec_hook('authenticate', array( 'host' => $RCMAIL->autoselect_host(), 'user' => trim(rcube_utils::get_input_value('_user', rcube_utils::INPUT_POST)), 'pass' => rcube_utils::get_input_value('_pass', rcube_utils::INPUT_POST, true, $RCMAIL->config->get('password_charset', 'ISO-8859-1')), 'cookiecheck' => true, 'valid' => $request_valid, )); // Login if ($auth['valid'] && !$auth['abort'] && $RCMAIL->login($auth['user'], $auth['pass'], $auth['host'], $auth['cookiecheck']) ) { // create new session ID, don't destroy the current session // it was destroyed already by $RCMAIL->kill_session() above $RCMAIL->session->remove('temp'); $RCMAIL->session->regenerate_id(false); // send auth cookie if necessary $RCMAIL->session->set_auth_cookie(); // log successful login $RCMAIL->log_login(); // restore original request parameters $query = array(); if ($url = rcube_utils::get_input_value('_url', rcube_utils::INPUT_POST)) { parse_str($url, $query); // prevent endless looping on login page if ($query['_task'] == 'login') { unset($query['_task']); } // prevent redirect to compose with specified ID (#1488226) if ($query['_action'] == 'compose' && !empty($query['_id'])) { $query = array(); } } // allow plugins to control the redirect url after login success $redir = $RCMAIL->plugins->exec_hook('login_after', $query + array('_task' => 'mail')); unset($redir['abort'], $redir['_err']); // send redirect $OUTPUT->redirect($redir, 0, true); } else { if (!$auth['valid']) { $error_code = RCMAIL::ERROR_INVALID_REQUEST; } else { $error_code = is_numeric($auth['error']) ? $auth['error'] : $RCMAIL->login_error(); } $error_labels = array( RCMAIL::ERROR_STORAGE => 'storageerror', RCMAIL::ERROR_COOKIES_DISABLED => 'cookiesdisabled', RCMAIL::ERROR_INVALID_REQUEST => 'invalidrequest', RCMAIL::ERROR_INVALID_HOST => 'invalidhost', ); $error_message = !empty($auth['error']) && !is_numeric($auth['error']) ? $auth['error'] : ($error_labels[$error_code] ?: 'loginfailed'); $OUTPUT->show_message($error_message, 'warning'); // log failed login $RCMAIL->log_login($auth['user'], true, $error_code); $RCMAIL->plugins->exec_hook('login_failed', array( 'code' => $error_code, 'host' => $auth['host'], 'user' => $auth['user'])); $RCMAIL->kill_session(); } } // end session else if ($RCMAIL->task == 'logout' && isset($_SESSION['user_id'])) { $RCMAIL->request_security_check($mode = rcube_utils::INPUT_GET); $userdata = array( 'user' => $_SESSION['username'], 'host' => $_SESSION['storage_host'], 'lang' => $RCMAIL->user->language, ); $OUTPUT->show_message('loggedout'); $RCMAIL->logout_actions(); $RCMAIL->kill_session(); $RCMAIL->plugins->exec_hook('logout_after', $userdata); } // check session and auth cookie else if ($RCMAIL->task != 'login' && $_SESSION['user_id']) { if (!$RCMAIL->session->check_auth()) { $RCMAIL->kill_session(); $session_error = true; } } // not logged in -> show login page if (empty($RCMAIL->user->ID)) { // log session failures $task = rcube_utils::get_input_value('_task', rcube_utils::INPUT_GPC); if ($task && !in_array($task, array('login','logout')) && !$session_error && ($sess_id = $_COOKIE[ini_get('session.name')]) ) { $RCMAIL->session->log("Aborted session $sess_id; no valid session data found"); $session_error = true; } if ($session_error || $_REQUEST['_err'] == 'session') { $OUTPUT->show_message('sessionerror', 'error', null, true, -1); } if ($OUTPUT->ajax_call || $OUTPUT->get_env('framed')) { $OUTPUT->command('session_error', $RCMAIL->url(array('_err' => 'session'))); $OUTPUT->send('iframe'); } // check if installer is still active if ($RCMAIL->config->get('enable_installer') && is_readable('./installer/index.php')) { $OUTPUT->add_footer(html::div(array('style' => "background:#ef9398; border:2px solid #dc5757; padding:0.5em; margin:2em auto; width:50em"), html::tag('h2', array('style' => "margin-top:0.2em"), "Installer script is still accessible") . html::p(null, "The install script of your Roundcube installation is still stored in its default location!") . html::p(null, "Please remove the whole installer folder from the Roundcube directory because . these files may expose sensitive configuration data like server passwords and encryption keys to the public. Make sure you cannot access the installer script from your browser.") )); } $plugin = $RCMAIL->plugins->exec_hook('unauthenticated', array('task' => 'login', 'error' => $session_error)); $RCMAIL->set_task($plugin['task']); $OUTPUT->send($plugin['task']); } else { // CSRF prevention $RCMAIL->request_security_check(); // check access to disabled actions $disabled_actions = (array) $RCMAIL->config->get('disabled_actions'); if (in_array($RCMAIL->task . '.' . ($RCMAIL->action ?: 'index'), $disabled_actions)) { rcube::raise_error(array( 'code' => 403, 'type' => 'php', 'message' => "Action disabled"), true, true); } } // we're ready, user is authenticated and the request is safe $plugin = $RCMAIL->plugins->exec_hook('ready', array('task' => $RCMAIL->task, 'action' => $RCMAIL->action)); $RCMAIL->set_task($plugin['task']); $RCMAIL->action = $plugin['action']; // handle special actions if ($RCMAIL->action == 'keep-alive') { $OUTPUT->reset(); $RCMAIL->plugins->exec_hook('keep_alive', array()); $OUTPUT->send(); } else if ($RCMAIL->action == 'save-pref') { include INSTALL_PATH . 'program/steps/utils/save_pref.inc'; } // include task specific functions if (is_file($incfile = INSTALL_PATH . 'program/steps/'.$RCMAIL->task.'/func.inc')) { include_once $incfile; } // allow 5 "redirects" to another action $redirects = 0; $incstep = null; while ($redirects < 5) { // execute a plugin action if (preg_match('/^plugin\./', $RCMAIL->action)) { $RCMAIL->plugins->exec_action($RCMAIL->action); break; } // execute action registered to a plugin task else if ($RCMAIL->plugins->is_plugin_task($RCMAIL->task)) { if (!$RCMAIL->action) $RCMAIL->action = 'index'; $RCMAIL->plugins->exec_action($RCMAIL->task.'.'.$RCMAIL->action); break; } // try to include the step file else if (($stepfile = $RCMAIL->get_action_file()) && is_file($incfile = INSTALL_PATH . 'program/steps/'.$RCMAIL->task.'/'.$stepfile) ) { // include action file only once (in case it don't exit) include_once $incfile; $redirects++; } else { break; } } if ($RCMAIL->action == 'refresh') { $RCMAIL->plugins->exec_hook('refresh', array('last' => intval(rcube_utils::get_input_value('_last', rcube_utils::INPUT_GPC)))); } // parse main template (default) $OUTPUT->send($RCMAIL->task); // if we arrive here, something went wrong rcmail::raise_error(array( 'code' => 404, 'type' => 'php', 'line' => __LINE__, 'file' => __FILE__, 'message' => "Invalid request"), true, true);

Just installed Drupal 8 website to get:

handle($request) // Handle the response object. ->prepare($request)->send(); $kernel->terminate($request, $response); } catch (HttpExceptionInterface $e) { $response = new Response($e->getMessage(), $e->getStatusCode()); $response->prepare($request)->send(); } catch (Exception $e) { $message = 'If you have just changed code (for example deployed a new module or moved an existing one) read http://drupal.org/documentation/rebuild'; if (Settings::get('rebuild_access', FALSE)) { $rebuild_path = $GLOBALS['base_url'] . '/rebuild.php'; $message .= " or run the rebuild script"; } // Set the response code manually. Otherwise, this response will default to a // 200. http_response_code(500); print $message; throw $e; }

Switching to "FCGId" and then back to "mod_php" fixes the error.