GNU bug report logs - #28329
25.2; Eshell: 40M+ output: Stack overflow in regexp matcher

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Package: emacs; Reported by: Pierre Neidhardt <ambrevar@HIDDEN>; Keywords: unreproducible moreinfo; dated Sat, 2 Sep 2017 09:36:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) moreinfo and unreproducible. Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 28329 <at> debbugs.gnu.org:


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From: Noam Postavsky <npostavs@HIDDEN>
To: 28329 <at> debbugs.gnu.org
Subject: Re: bug#28329: 25.2;
 Eshell: 40M+ output: Stack overflow in regexp matcher
References: <87lglxbg00.fsf@HIDDEN> <87ziac5xsn.fsf@HIDDEN>
 <87r2uwmf25.fsf@HIDDEN>
Date: Fri, 20 Oct 2017 21:20:06 -0400
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tags 28329 + moreinfo unreproducible
quit

Noam Postavsky <npostavs@HIDDEN> writes:

>> Apparently, the line is just plain too long...
>> I guess limiting the regexp matcher over, say, the first 256 characters
>> would fix the issue.
>> ----------
>
> Can you catch that build output in a file, so it could be reproduced by
> running 'cat build.log' in eshell?  I tried copying the fragment you
> have in your backtrace a couple of times to make it longer, but I was
> unable to trigger the error.  Perhaps the particular contents of the
> string matters too (some values might let the matcher short-circuit the
> backtracking).

ping?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28329; Package emacs. Full text available.

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From: Noam Postavsky <npostavs@HIDDEN>
To: 28329 <at> debbugs.gnu.org
Subject: Re: bug#28329: 25.2;
 Eshell: 40M+ output: Stack overflow in regexp matcher
References: <87lglxbg00.fsf@HIDDEN> <87ziac5xsn.fsf@HIDDEN>
Date: Sun, 24 Sep 2017 08:55:30 -0400
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bug#28329; Package emacs. Full text available.

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From: npostavs@HIDDEN
To: 28329 <at> debbugs.gnu.org, Pierre Neidhardt <ambrevar@HIDDEN>
Subject: Re: bug#28329: 25.2;
 Eshell: 40M+ output: Stack overflow in regexp matcher
Date: Sat, 02 Sep 2017 22:19:20 -0400
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From: Pierre Neidhardt <pe.neidhardt@HIDDEN>
X-Google-Original-From: Pierre Neidhardt <pe.neidhardt@HIDDEN>
To: npostavs@HIDDEN
Subject: Re: bug#28329: 25.2; Eshell: 40M+ output: Stack overflow in regexp matcher
References: <87lglxbg00.fsf@HIDDEN> <873785706u.fsf@HIDDEN>
Date: Sat, 02 Sep 2017 19:02:21 +0100
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28329; Package emacs. Full text available.

Message received at 28329 <at> debbugs.gnu.org:


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References: <87lglxbg00.fsf@HIDDEN> <873785706u.fsf@HIDDEN>
User-agent: mu4e 0.9.18; emacs 25.2.1
From: Pierre Neidhardt <ambrevar@HIDDEN>
To: npostavs@HIDDEN
Subject: Re: bug#28329: 25.2;
 Eshell: 40M+ output: Stack overflow in regexp matcher
In-reply-to: <873785706u.fsf@HIDDEN>
Date: Sat, 02 Sep 2017 14:27:25 +0100
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Sadly, I had to kill Emacs before I could do it (it was almost
completely hanging).

Thinking of a way of reproduicing this... Maybe create a 40M+ file of
random clang/g++ output and dump it to Eshell's stdout.

-- 
Pierre Neidhardt




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28329; Package emacs. Full text available.

Message received at 28329 <at> debbugs.gnu.org:


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From: npostavs@HIDDEN
To: Pierre Neidhardt <ambrevar@HIDDEN>
Subject: Re: bug#28329: 25.2;
 Eshell: 40M+ output: Stack overflow in regexp matcher
References: <87lglxbg00.fsf@HIDDEN>
Date: Sat, 02 Sep 2017 08:30:01 -0400
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Pierre Neidhardt <ambrevar@HIDDEN> writes:

> Today I update my Gentoo:
>
> 	> emerge --update --newuse --deep @world
>
> in Eshell.  After a very long output (40M+), the shell started stuttering and hanging, messaging the following errors on every new line of output:
>
> 	error in process filter: eshell-watch-for-password-prompt: Stack overflow in regexp matcher
> 	error in process filter: Stack overflow in regexp matcher
>
> The process became so slow it was unlikely it would ever complete, so I terminated it and had to re-run it in a *term*.

Can you get a backtrace if you M-x toggle-debug-on-error?  It would be
helpful to get a sample of output which triggers this.

Does changing the password regexp help?

    (setq eshell-password-prompt-regexp
          (format "^.\\{,80\\}%s.\\{,80\\}:\\s-*\\'"
                  (regexp-opt password-word-equivalents)))




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28329; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: 25.2; Eshell: 40M+ output: Stack overflow in regexp matcher
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Today I update my Gentoo:

	> emerge --update --newuse --deep @world

in Eshell.  After a very long output (40M+), the shell started stuttering and hanging, messaging the following errors on every new line of output:

	error in process filter: eshell-watch-for-password-prompt: Stack overflow in regexp matcher
	error in process filter: Stack overflow in regexp matcher

The process became so slow it was unlikely it would ever complete, so I terminated it and had to re-run it in a *term*.



In GNU Emacs 25.2.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.15)
 of 2017-08-28 built on dhiov23k
Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
System Description:	Gentoo Base System release 2.3

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-25.2
 --htmldir=/usr/share/doc/emacs-25.2/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-25.2 '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




Acknowledgement sent to Pierre Neidhardt <ambrevar@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#28329; Package emacs. Full text available.
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