A suggestion, not an issue (anymore).

[stevenjblair]

I kept getting these endpoint failures and could not get any of the software I really needed installed. I'm new to spack, so it was really frustrating.

I have these files building up in the /tmp/user/spack-stage and I just assumed they were just text logs.

Anyhow, I suggest you mention somewhere that if you are getting errors like this:
`==> Error: BrokenPipeError: [Errno 108] Cannot send after transport endpoint shutdown: '/n/holylabs/LABS/jharvard_lab/Lab/software/spack'
See build log for details:
/tmp/sjblair/spack-stage/spack-stage-automake-1.16.5-h2oi3k5nk3pivmgggizheq2lzqvrdyzi/spack-build-out.txt

==> Error: [Errno 108] Cannot send after transport endpoint shutdown: '/n/holylabs/LABS'`

That you can simply fix it with:
spack clean --all

I was getting a lot of different errors all week, "clearing the cache" is always a go-to but for those of us who have not used spack before it would be good to have how to clear all of it out in the fasrc documentation. spack clean -m was not enough to put an end to all these errors.

Anyhow, I hope this helps someone else. Took me an embarrassing amount of time to figure it out on my own.