WordPress website shows 503 Service Temporarily Unavailable: AH01075: Error dispatching request to

Created:

2017-01-17 04:54:08 UTC

Modified:

2017-08-08 13:17:15 UTC

6

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WordPress website shows 503 Service Temporarily Unavailable: AH01075: Error dispatching request to

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • The following error can be found in /var/www/vhosts/example.com/logs/error_log file:
    [proxy_fcgi:error] [pid 350:tid 139649016084224] (104)Connection reset by peer: [client 203.0.113.2:58642] AH01075: Error dispatching request to :, referer: http://example.com/wordpress/wp-admin/upload.php
  • Errors in /var/log/audit/audit.log :
    type=ANOM_ABEND msg=audit(1484625171.339:4365269): auid=4294967295 uid=10006 gid=1003 ses=4294967295 subj=system_u:system_r:unconfined_service_t:s0 pid=22074 comm="php-fpm" reason="memory violation" sig=11
  • PHP FPM handler errors in /var/log/messages :
    server kernel: php-fpm[22064]: segfault at a636 ip 000000000000a636 sp 00007ffcc57f8948 error 14 in php-fpm[400000+3a8000]
  • `dmesg` command output:
    
    [4289853.349667] php-cgi[49427]: segfault at 30 ip 00007fc662113088 sp 00007fc62f2d0d10 error 4
    [4289853.349670] php-cgi[49424]: segfault at 30 ip 00007fc662113088 sp 00007fc630ad3d10 error 4
    [4289853.349672] in libMagickCore.so.5.0.0[7fc661f8e000+237000]
    [4289853.349674] in libMagickCore.so.5.0.0[7fc661f8e000+237000]


    [4289853.349680] in libMagickCore.so.5.0.0[7fc661f8e000+237000]

 

Cause

ImageMagick library bug.

Resolution

As a temporary workaround, either disable imagick PHP module in Tools & Settings > PHP Settings, or remove ImageMagick RPM package using a command:

rpm -e ImageMagick

Make sure that no sites are using this module.

It is also possible that updating system packages will resolve the issue.

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