Thread: Issues with using plpgsql debugger using PG13 on Centos 7

Hi,

I am trying to setup the debugger plugin on Centos 7 where PG 13 server has been setup using the git repository located here - https://git.postgresql.org/gitweb/?p=pldebugger.git;a=summary

The OS version is CentOS Linux release 7.9.2009 (Core).

However, after making the changes to postgresql.conf to reference the plugin_debugger.so library that was created on CentOS 7 using several variations to ensure that the .so file was being referenced -

shared_preload_libraries = '/usr/lib64/pgsql/plugin_debugger'

or

shared_preload_libraries = 'plugin_debugger'

or

shared_preload_libraries = '/usr/pgsql-13/lib/plugin_debugger.so'

I encountered the following error during postgres start up–

-- Unit postgresql-13.service has begun starting up.

Feb 01 21:53:20 myserver.com postmaster[22726]: 2021-02-02 02:53:20.482 GMT [22726] LOG:  skipping missing configuration file "/data/pgdata/data/postgresql.auto.conf"

Feb 01 21:53:20 myserver.com postmaster[22726]: 2021-02-01 21:53:20.485 EST [22726] FATAL:  could not load library "/usr/lib64/pgsql/plugin_debugger.so": /usr/lib64/pgsql/plug

Feb 01 21:53:20 myserver.com postmaster[22726]: 2021-02-01 21:53:20.486 EST [22726] LOG:  database system is shut down

Feb 01 21:53:20 myserver.com systemd[1]: postgresql-13.service: main process exited, code=exited, status=1/FAILURE

Feb 01 21:53:20 myserver.com systemd[1]: Failed to start PostgreSQL 13 database server.

-- Subject: Unit postgresql-13.service has failed

-- Defined-By: systemd

-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

--

-- Unit postgresql-13.service has failed.

--

-- The result is failed.

Feb 01 21:53:20 rich-arch-01-pp.ipa.snapbs.com systemd[1]: Unit postgresql-13.service entered failed state.

Feb 01 21:53:20 rich-arch-01-pp.ipa.snapbs.com systemd[1]: postgresql-13.service failed.

Though the library wasn’t loaded, I attempted to add the extension at the DB level using

CREATE EXTENSION pldbgapi;

But got the following error –

ERROR: could not load library "/usr/pgsql-13/lib/plugin_debugger.so": /usr/pgsql-13/lib/plugin_debugger.so: undefined symbol: LWLockAssign SQL state: 58P01

Can you please help with getting the debugger working ?

Thanks

Ankit

Thank you for the pointer. We were able to build it correctly after setting the PG-13 path

PATH=$PATH:/usr/pgsql-13/bin

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