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

[Kaushal Modi]

On Wed, Jan 23, 2019 at 1:05 PM Paul Eggert <eggert@cs.ucla.edu> wrote:

On 1/23/19 9:37 AM, Kaushal Modi wrote:
> I ran:
>
> strace -o /tmp/par.tr <http://par.tr> par, and
> strace -o /tmp/emacs.tr <http://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.

We care about the I/O requests involving the text you're reformatting,
so I suggest running 'par' on some innocuous text and just looking at
the associated syscalls (assuming you can reproduce the problem).

Also, please try running the shell command 'fmt' on the same text, to
see if that can reproduce the problem. If it doesn't reproduce the
problem, see how fmt's system calls differ from par's. I mention 'fmt'
because it's similar to 'par' and I can easily run 'fmt' here.

Hi Paul,

Thanks for your time. I hate it when this happens.

This issue got automagically "solved". I cannot recreate this issue any more.

All I did was rebuild Emacs to the latest master.

[ As I did not understand the root cause of this issue, I am certain that this will repeat at some point. ]

Kaushal