bug#34174: 27.0.50; Calling `par' via shell-command-on-region always errors out

[Kaushal Modi]

On Wed, Jan 23, 2019 at 12:30 PM Paul Eggert <eggert@cs.ucla.edu> wrote:

To help debug the problem, try running 'truss -o /tmp/par.tr par'
instead of 'par', under both the old and new Emacs, and spot the difference.

Try also running 'truss -o /tmp/emacs.tr emacs -Q' instead of plain 'emacs'.

I don't have truss installed. But I googled about it, and looks like strace is equivalent.

I ran:

strace -o /tmp/par.tr par, and

strace -o /tmp/emacs.tr emacs -Q

Looking at the .tr files, they could possibly contain work sensitive data. So I am not sure if I should share those files publicly.

What should I be looking for in there?

Also, as I am playing with this more, I realize that I cannot 100% reproduce the problem on emacs -Q on master branch.

[ So the problem, as you guessed, seems to be with my OS (RHEL 6.8) .. But why only `par`? hmm ]