Apache cannot start: Segmentation fault

Symptoms

• The error is shown in Plesk:

  PLESK_ERROR: Error: Can not reconfigure web server configurations: Unable to execute httpdmng: Execution failed.
  Command: httpdmng
  Arguments: Array
  (
  [0] => --reconfigure-server
  [1] => -no-restart
  )
  
  Details: [2017-12-08 18:31:10] ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/apache-config' '-t'] with exit code [139]
  [2017-12-08 18:31:10] ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/apache-config' '-t'] with exit code [139]
  [2017-12-08 18:31:10] ERR [panel] Apache config (15127758690.86779700) generation failed: Template_Exception: /usr/sbin/apachectl: line 110: 15360 Segmentation fault /usr/sbin/httpd $OPTIONS "$@"
  
  file: /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php
  line: 75
  code: 0
  /usr/sbin/apachectl: line 110: 15360 Segmentation fault /usr/sbin/httpd $OPTIONS "$@"

• Errors are logged into /var/log/messages :

  CONFIG_TEXT: kernel: httpd[15091]: segfault at 8 ip 00007f6f763ca3b8 sp 00007ffd8cf89ca0 error 4 in ld-2.17.so[7f6f763bf000+20000]
  systemd: httpd.service: main process exited, code=killed, status=11/SEGV
  kill: kill: cannot find process ""

• The binary is marked as modified:

  # rpm -V httpd | grep /usr/sbin/httpd
  S.5....T. /usr/sbin/httpd

Cause

Corrupted /usr/sbin/httpd file.

Resolution

1. Connect to the server via SSH ;

2. Download appropriate .rpm for httpd package:

   # yum install yum-utils
   # yumdownloader httpd

3. Reinstall the dowpackage:

   # rpm -Uvh --force httpd