Comment # 13 on bug 1110259 from Tristan Miller

(In reply to Michael Voronov from comment #7)
> I can confirm it on OpenSUSE Tumbleweed. It hangs when zypper tries to
> delete the old version. The workaround is to delete it with:
> sudo zypper rm btrfsmaintenance-0.4.2-2.1
> And then restart zypper dup

I think that's a pretty poor workaround as you will end up skipping all the
post-installation scripts of the packages that were successfully installed.

A better workaround is to kill the command that is causing the installation of
btrfsmaintenance to hang, as in Comment 8.  I did this by running "ps -ft
pts/0", making note of the PPID of the "/usr/bin/systemctl try-restart
btrfsmaintenance-refresh.service" process, and killing it.