bug#29154: 25.3; Eshell: Pipes seem to hang or corrupt data when text chunk is large (>10k lines)

[Noam Postavsky]

close 29154
merge 29154 25549
quit

Pierre Neidhardt <ambrevar@gmail.com> writes:

> - emacs -Q
> - M-x eshell
>
>       ~ $ time cat /usr/share/dict/words | wc -l
>       234937
>       12.005 secs
>       ~ $ time cat /usr/share/dict/words | wc -l
>       234937
>       12.010 secs
>       ~ $ time cat /usr/share/dict/words | wc -l
>       234937
>       11.321 secs
>       ~ $ time cat /usr/share/dict/words | wc -l
>       234937
>       11.861 secs
>       ~ $ time cat /usr/share/dict/words | wc -l
>       188508
>       3.734 secs
>       ~ $ 
>
> Notice in the last case that the output is wrong.
>
> Sometimes the above command seeminly never terminates, or maybe it's
> just taking too long for my patience.
>
> Because of its randomness, it's hard to reproduce.

This is Bug#25549, it should already be fixed in the 26.0.90 pretest
release.