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Description of problem:

See bug 1726141 for some background, esp. #c13.

I do see a dnf crashing when having a repo with zck compressed repodata only. When there are both zck and other (sqlite.bz2, gz) repodata the coredump is not happening (this was fixed fixed in 1726141).

e.g. command
# dnf list --available
crashes

dnf-4.2.7-4.el8.noarch
libdnf-0.35.1-5.el8.x86_64
librepo-1.10.3-2.el8.x86_64

On F30 the scenario works fine.

I create a PR that add additional test whether primary is part of downloaded metadata. https://github.com/rpm-software-management/libdnf/pull/802

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1856