Comment # 7 on bug 924346 from patrick shanahan

(In reply to Michael Andres from comment #6)
> I suspect that one of the plugins
> (/usr/lib/zypp/plugins/commit/btrfs-defrag-plugin.py
> and/or /usr/lib/zypp/plugins/commit/snapper.py) cause some daemon to be
> started. 
> 
> The daemon does not close it's stdout (inherited from the plugin). This way
> the pipe is not closed and we hang trying to read the plugins final data.
> I'll check the zypp code to make sure we're always protected against such
> miss behaving deamons. The plugin code uses a slightly different code path
> than the rpm-install (where miss behaving deamons launched in %pre/%post
> scripts dont bit us).
> 
> If you can identify the daemon (some snapper related stuff) and kill it,
> zypper should continue.

I did kill it, but it do not continue and, if memory servers would not restart.
 And checked that instance was closed/killed.