Hi,

We are about to enable building against ruby3.0 on unstable. During a test
rebuild, ruby-remcached was found to fail to build in that situation.

To reproduce this locally, you need to install ruby-all-dev from experimental
on an unstable system or build chroot.

Relevant part (hopefully):

The tests for ruby3.0 failed because eventmachine was not rebuilt for
ruby3.0 yet, but the dpkg-buildpackage process stayed stuck, because the
memcached that is started for the tests was never really killed. I could
easily reproduce this locally.

The full build log is available at
https://people.debian.org/~kanashiro/ruby3.0/round2/builds/3/ruby-remcached/ruby-remcached_0.4.1-3+rebuild1633393197_amd64.build.txt