Comment # 15 on bug 1175487 from Dr. Werner Fink

(In reply to Sean O'Connell from comment #14)
> I have done further testing on this issue and have isolated the problem to
> interaction with the 'async' package
> (https://github.com/jwiegley/emacs-async).
> 
> There are two async package versions currently available:
> 
> async 1.9.3 (gnu)
> async 20200809.501 (melpa)
> 
> I have tested the Emacs packages from the TW repo, from the Editors repo,
> and from Andreas Schwab's Emacs repo.
> 
> Andreas' build has no issue with either async package (gnu or melpa).
> 
> The builds from TW and Editors both present the "error in process sentinel:
> async-handle-result.." error once either async package (gnu or melpa) is
> loaded and a network file download operation is performed (e.g. installing a
> package or downloading an enclosure in Elfeed).

Hmmm ... there is one difference between Andreas approach and my ... in my spec
file the whole lisp tree is byte compiled with the fresh (t)emacs (boot
strapped).  Whereas Andreas takes the byte copiled lisp file as they are.

In principle this should not make a difference ... otherwise there is a real
bug or the soource tar ball is not complete