Symfony2 app_dev.php only error 500脚本过早结束

当我打开一个页面时,我得到错误500.服务器返回此错误,而不是Symfony.
如果我刷新,我显示页面没有错误.
但是,当我打开一个新页面(新网址,同一网站)时,错误再次出现.

我试图重新加载apache.我尝试删除所有缓存和日志.
我的控制台文件,app.php文件,app_dev.php文件已取消注释umask(0000).

当我遇到错误时,这是??symfony2日志的最后一行：

[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "JMSI18nRoutingBundleEventListenerCookieSettingListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentSecurityHttpFirewallContextListener::onKernelResponse". [] []
[2015-09-04 11:20:57] security.DEBUG: Write SecurityContext in the session [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyBridgeMonologHandlerFirePHPHandler::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyBridgeMonologHandlerChromePhpHandler::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentHttpKernelEventListenerResponseListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentHttpKernelEventListenerEsiListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentSecurityHttpRememberMeResponseListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SensioBundleFrameworkExtraBundleEventListenerHttpCacheListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentHttpKernelEventListenerProfilerListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyBundleWebProfilerBundleEventListenerWebDebugToolbarListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentHttpKernelEventListenerSaveSessionListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.response" to listener "SymfonyComponentHttpKernelEventListenerStreamedResponseListener::onKernelResponse". [] []
[2015-09-04 11:20:57] event.DEBUG: Notified event "kernel.terminate" to listener "SymfonyBundleSwiftmailerBundleEventListenerEmailSenderListener::onTerminate". [] []

apache错误日志：

[Fri Sep 04 11:24:49 2015] [error] [client my.ip.here] Premature end of script headers: app_dev.php

当我使用app.php时,prod中不存在这个问题

系统日志没有关于此的内容.我在同一台服务器上的其他网站上没有问题.我没有硬盘空间问题.

有人有想法吗？谢谢

app_dev.php文件：

<?php


use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentDebugDebug;


// If you don't want to setup permissions the proper way,just uncomment the following PHP line
// read http://symfony.com/doc/current/book/installation.html#configuration-and-setup for more information
umask(0000);

// This check prevents access to debug front controllers that are deployed by accident to production servers.
// Feel free to remove this,extend it,or make something more sophisticated.
if (isset($_SERVER['HTTP_CLIENT_IP'])
    || isset($_SERVER['HTTP_X_FORWARDED_FOR'])
    || !in_array(@$_SERVER['REMOTE_ADDR'],array('127.0.0.1','xxx.xxx.xxx.xxx'))
) {
    header('HTTP/1.0 403 Forbidden');
    exit($_SERVER['REMOTE_ADDR'].' : You are not allowed to access this file. Check '.basename(__FILE__).' for more information.');
}

$loader = require_once __DIR__.'/../app/bootstrap.php.cache';
Debug::enable();

require_once __DIR__.'/../app/AppKernel.php';

$kernel = new AppKernel('dev',true);
$kernel->loadClassCache();
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request,$response);

对于apache配置,这是isp配置配置,我刚为这个网站添加了这个：

Apache指令：

DocumentRoot /var/www/clients/client2/web56/web/symfony/web/
FcgidMaxRequestLen 20000000

php.ini：

apc.shm_size = 256M
realpath_cache_size = 4096k
realpath_cache_ttl=7200
session.auto_start = 0
xdebug.remote_autostart=0
xdebug.remote_enable=0
xdebug.profiler_enable=0

在config_dev.yml中,如果我从monolog配置中删除firephp和chromephp,问题就解决了.
我不认为这是一个很好的解决方案,任何人都有其他想法？