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

From: Paul Eggert
Subject: bug#34174: 27.0.50; Calling `par' via shell-command-on-region always errors out
Date: Wed, 23 Jan 2019 10:05:44 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

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.

[ So the problem, as you guessed, seems to be with my OS (RHEL 6.8) .. But why only `par`? hmm ]
Wow, that's older than even the most-ancient RHEL host I have ready access to (RHEL 6.10). I could not reproduce the problem on that host, using 'fmt'.

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