RT 4.4.2 on a new server upgrade woes

Good day to everyone.

I have a situation where I have a legacy physical system that has RT 3.6.1/Debian 5.0.1 residing on it, and need to migrate it to a new VM targeting RT 4.4.1/Debian 9.9.

I have successfully installed MariaDB and restored the database, and installed apache2. I also included the requisite support packages (rt4-apache2, rt4-clients, rt4-db-mysql) as well as request-tracker4. Following the installation, I restored a backup of the database on the new server, granted the service user permissions to access it, and then ran the upgrade script:

/usr/sbin/rt-setup-database --action upgrade --skip-create --upgrade-from 3.6.1 --upgrade-to 4.4.1

When I attempt to access the web UI, I receive a 500 Internal error, and the apache error log states:

[Thu May 23 11:34:27.435432 2019] [perl:error] [pid 1688:tid 140609713043200] [client] Error while loading /usr/share/request-tracker4/libexec/rt-server: DBD::mysql::db prepare failed: handle 2 is owned by thread 55dec7dadbb0 not current thread 55dec8e97460 (handles can’t be shared between threads and your driver may need a CLONE method added) at /usr/local/share/perl/5.24.1/DBIx/SearchBuilder/Handle.pm line 549.\n

Any ideas? I have also attempted to piece-meal the upgrade (3.6.1 -to 3.7.87, run the schema upgrade, and then go the rest of the way to 4.4.1), but no luck and the same error.

I appreciate the help.