Bug#1039898: mod-qos can not be enabled correctly for apache2 in Debian 12

[Nikolay Dikhtyar]

Package: libapache2-mod-qos

Version: 11.63-1+b2

Error starting apache2 service after installing mod-qos.

There was installed apache2 and after installed libapache2-mod-qos. Saw the following error in output:

apache2_invoke: Enable module qos
apache2_reload: Your configuration is broken. Not restarting Apache 2
apache2_reload: apache2: Syntax error on line 146 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/qos.load: Cannot load /usr/lib/apache2/modules/mod_qos.so into server: /usr/lib/apache2/modules/mod_qos.so: undefined symbol: pcre_free

Full output: 

root@4cc791a5ed7d:/# apt-get install libapache2-mod-qos
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  libpcre3 libpng16-16
The following NEW packages will be installed:
  libapache2-mod-qos libpcre3 libpng16-16
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 849 kB of archives.
After this operation, 1970 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://deb.debian.org/debian bookworm/main amd64 libpcre3 amd64 2:8.39-15 [341 kB]
Get:2 http://deb.debian.org/debian bookworm/main amd64 libpng16-16 amd64 1.6.39-2 [276 kB]
Get:3 http://deb.debian.org/debian bookworm/main amd64 libapache2-mod-qos amd64 11.63-1+b2 [233 kB]
Fetched 849 kB in 0s (39.8 MB/s)        
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package libpcre3:amd64.
(Reading database ... 9844 files and directories currently installed.)
Preparing to unpack .../libpcre3_2%3a8.39-15_amd64.deb ...
Unpacking libpcre3:amd64 (2:8.39-15) ...
Selecting previously unselected package libpng16-16:amd64.
Preparing to unpack .../libpng16-16_1.6.39-2_amd64.deb ...
Unpacking libpng16-16:amd64 (1.6.39-2) ...
Selecting previously unselected package libapache2-mod-qos.
Preparing to unpack .../libapache2-mod-qos_11.63-1+b2_amd64.deb ...
Unpacking libapache2-mod-qos (11.63-1+b2) ...
Setting up libpcre3:amd64 (2:8.39-15) ...
Setting up libpng16-16:amd64 (1.6.39-2) ...
Setting up libapache2-mod-qos (11.63-1+b2) ...
apache2_invoke: Enable module qos
apache2_reload: Your configuration is broken. Not restarting Apache 2
apache2_reload: apache2: Syntax error on line 146 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/qos.load: Cannot load /usr/lib/apache2/modules/mod_qos.so into server: /usr/lib/apache2/modules/mod_qos.so: undefined symbol: pcre_free
Processing triggers for libc-bin (2.36-9) ...

--

Best regards, 

Nikolay Dikhtyar

[Narcis Garcia]

I read from
https://unix.stackexchange.com/questions/65492/debian-installing-mod-qos-on-apache-results-in-error-on-start

There Jenny D suggests mod_qos depends on mod_ssl to be loaded before.
I've tried this with NO success:
a2enmod ssl
cd /etc/apache2/mods-enabled/
mv ssl.load 00_ssl.load
systemctl stop apache2
systemctl start apache2

Workaround that worked for me as of Debian 12.1 has been:
a2dismod qos

--

Narcis Garcia

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