bug#67538: Shepherd stops responding during "guix system reconfigure"

[Attila Lendvai]

> > my suspicion is that it's due to some error coming from a start
> > GEXP that somehow derails shepherd's event loop.


[...]


> iirc I once managed to get a debugger out when it happened and it's
> stuck waiting in one of the epoll/select/alike calls,


...or one of the start/stop GEXP's calls something that (sometimes?) blocks 
indefinitely (which violates the API of shepherd).

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