Bug#903958: Apache processes limited to 1000

[Thomas Mühlberg <muehlberg@cormes.de>]

Package: apache2 apache2-bin apache2-data apache2-utils
Version: 2.4.25-3+deb9u5

After upgrade from version 2.4.25-3+deb9u4 to 2.4.25-3+deb9u5 the Apache 
processes are limited to 1000.
After rollback to version 2.4.25-3+deb9u4 everything works fine again.
The configuration will be ignored. 
/etc/apache2/mods-available/mpm_prefork.conf

<IfModule mpm_prefork_module>
     StartServers 10
     MinSpareServers 10
     MaxSpareServers 20
     MaxRequestWorkers 4000
     ServerLimit 4000
     MaxConnectionsPerChild 0
</IfModule>


I am using Debian GNU/Linux 9.5 (stretch) kernel version 4.9.0-7-amd64

Sincerely

Thomas Mühlberg