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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Pierre Neidhardt <ambrevar <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.3;
 Eshell: Pipes seem to hang or corrupt data when text chunk is large
 (>10k lines)
Date: Sun, 05 Nov 2017 12:27:07 +0100

- 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.



In GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.16)
 of 2017-11-05 built on dhiov23k
Windowing system distributor 'The X.Org Foundation', version 11.0.11905000
System Description:	Gentoo Base System release 2.4.1

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-dependency-tracking
 --disable-silent-rules --docdir=/usr/share/doc/emacs-25.3
 --htmldir=/usr/share/doc/emacs-25.3/html --libdir=/usr/lib64
 --program-suffix=-emacs-25 --infodir=/usr/share/info/emacs-25
 --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --with-gameuser=:gamestat --without-compress-install
 --with-file-notification=inotify --enable-acl --without-dbus
 --without-modules --without-gpm --without-hesiod --without-kerberos
 --without-kerberos5 --with-xml2 --without-selinux --with-gnutls
 --without-wide-int --with-zlib --with-sound=alsa --with-x --without-ns
 --without-gconf --without-gsettings --without-toolkit-scroll-bars
 --with-gif --with-jpeg --with-png --with-rsvg --with-tiff --with-xpm
 --with-imagemagick --with-xft --without-cairo --without-libotf
 --without-m17n-flt --with-x-toolkit=gtk3 --without-xwidgets
 GENTOO_PACKAGE=app-editors/emacs-25.3 'CFLAGS=-march=ivybridge -O2
 -pipe' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND NOTIFY ACL GNUTLS LIBXML2
FREETYPE XFT ZLIB GTK3 X11

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Message #8 received at 29154 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Pierre Neidhardt <ambrevar <at> gmail.com>
Cc: 29154 <at> debbugs.gnu.org
Subject: Re: bug#29154: 25.3;
 Eshell: Pipes seem to hang or corrupt data when text chunk is large
 (>10k lines)
Date: Sun, 05 Nov 2017 06:45:53 -0500

close 29154
merge 29154 25549
quit

Pierre Neidhardt <ambrevar <at> 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.

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