Daniel Colascione <dancol@dancol.org> writes:

>> Are there bug#NNN where these are discussed?
>
> No. The motiviation is Tramp inflooping after a quit because it uses
> with-local-quit inside tramp-accept-process-output, which causes
> tramp-wait-for-regexp to retry infinitely and quickly.
>
> I found *that* behavior trying to figure out why M-x compile over
> Tramp was hanging not only Emacs, but also the SSH connection more
> generally. I *think* it has something to do with compilation-filter
> calling file-truename, which invokes Tramp's handler, which wants to
> talk over the same SSH connection that's spewing compilation messages,
> deadlocking something somewhere.

Please write a bug report, it should be solved in Tramp.

with-local-quit is used in tramp-accept-process-output by
intention. There were reports that Tramp hung, and couldn't be quit ...

Would the appended patch help (completely untested)?

Best regards, Michael.