Description of problem:

Restore of incremental backup taken from RHEL7-based Satellite 6.11 on RHEL8-based Satellite 6.11 fails with an error like this, leaving Satellite server in broken state:

--------------------------------------------------------------------------------
REINDEX databases:

• Reindexing the databases [FAIL]
  Failed executing runuser - postgres -c "reindexdb -a", exit status 1:
  reindexdb: error: could not connect to database template1: FATAL: could not open file "base/1/167655": No such file or directory
  --------------------------------------------------------------------------------

Version-Release number of selected component (if applicable):

Red Hat Satellite 6.11.x

How reproducible:

Always.

Steps to Reproduce:

1. Take full offline backup from a RHEL7-based Satellite server.

2. Copy the full backup to and restore it on a newly built RHL8-based Satellite server. The restore completes successfully.

3. Take an incremental offline backup from the RHEL7-based Satellite server.

4. Copy the incremental backup to and restore it on the RHL8-based Satellite server. The restore fails with an error similar to the one in the problem description.

Actual results:

• The restore of the full backup completes successfully.
• The restore of the incremental backup fails with an error similar to the one in the problem description.

Expected results:

Both full and incremental offline backups complete successfully.