Duncan Greatwood <dgbulk@gmail.com> writes:

Hi Duncan,

> Meanwhile, good luck with debugging these bug#45518 issues.

Finally, I nailed it down. In the (remote) compilation process, there is
a process filter, which calls `file-truename' if it detects an
error. This works one or two times, but then the (remote) compilation
process comes in conflict with the (remote) Tramp process responsible
for `file-truename'.

The following patch has fixed the issue for me on my FreeBSD machine. It
is on top of Emacs' git master; but likely it works also for your Emacs
27 (not tested by me). Could you check, whether this helps you?

> Thanks again!

Best regards, Michael.