Article ID: 120873, created on Apr 3, 2014, last review on May 11, 2014

  • Applies to:
  • Plesk 11.5 for Linux


Apache crashes randomly on the Plesk 11.5 server.

    # service httpd status
    httpd dead but pid file exists

The info about installed system:

# rpm -qa | grep httpd

# cat /etc/issue
CloudLinux Server release 6.5 (Pavel Popovich)

/var/log/httpd/error_log contains messages like:

*** glibc detected *** /usr/sbin/httpd: double free or corruption (out): 0x00007f4b0fbebe10 ***
======= Backtrace: =========

*** glibc detected *** /usr/sbin/httpd: free(): invalid pointer: 0x00007f53755caf80 ***
======= Backtrace: =========


This means your web server has crashed. This can be a bug inside either the Apache server or a module you have loaded.


Try upgrading Apache to the latest stable version, if one is available.

yum check-update httpd

Try to disable some additionally configured modules like

If the problem persists you need to get Apache core dump.

Core dump is an operation of saving current state of a process and its memory to a file when a daemon (service) terminates abnormally.

Core dump files can take few hundred megabytes of a disk space - make sure that there is enough space on the drive. The instruction below are actual for CentOS and Red Hat operating systems.

  1. Modify Apache configuration:

      File: /etc/httpd/conf/httpd.conf
      CoreDumpDirectory /var/apache-dump
  2. Create directory:

      mkdir /var/apache-dump
      chown apache.apache /var/apache-dump
      chmod 0770 /var/apache-dump
  3. If the core dump files size is set to '0' enable it for httpd daemon:

    grep DAEMON_COREFILE_LIMIT /etc/sysconfig/httpd
  4. Restart Apache HTTP server:

    service httpd restart
  5. Testing configuration:

    kill -11 [PID]
  6. Apache Debugging Guide

If you was not able to find the root cause ask for help from Apache discussion groups.

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