Package: auctex;
Reported by: bram.adams <at> queensu.ca
Date: Thu, 17 Jul 2025 11:06:01 UTC
Severity: normal
Found in version 14.0.9
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bug-auctex <at> gnu.org:bug#79037; Package auctex.
(Thu, 17 Jul 2025 11:06:02 GMT) Full text and rfc822 format available.bram.adams <at> queensu.ca:bug-auctex <at> gnu.org.
(Thu, 17 Jul 2025 11:06:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: bram.adams <at> queensu.ca To: bug-auctex <at> gnu.org Subject: 14.0.9; Fixing infinite loop with `TeX-previous-error' Date: Wed, 16 Jul 2025 20:38:45 -0400
[Message part 1 (text/plain, inline)]
Hi,
When `TeX-debug-warnings' and `TeX-suppress-ignored-warnings' are enabled, invoking `TeX-previous-error' can lead to an infinite loop in `TeX-parse-TeX'. As the `unless' condition always fails, `arg' is never incremented to 0, hence the value of `TeX-error-last-visited' decrements forever. There are no issues when invoking `TeX-next-error'.
The attached patch seems to fix this bug with `TeX-previous-error'.
Kind regards,
Bram Adams
Emacs : GNU Emacs 30.1 (build 1, aarch64-apple-darwin24.3.0, NS appkit-2575.40 Version 15.3 (Build 24D60))
of 2025-03-06
Package: 14.0.9
current state:
==============
(setq
window-system 'ns
LaTeX-version "2e"
TeX-style-path '("~/.emacs.d/auctex/" "~/.emacs.d/elpaca/builds/auctex/style" "~/.emacs.d/auctex/auto" "~/.emacs.d/auctex/style" "auto" "style")
TeX-auto-save nil
TeX-parse-self nil
TeX-master t
TeX-command-list '(("LatexMk" "latexmk %(-PDF)%S%(mode) %(file-line-error) %(extraopts) %t" TeX-run-latexmk nil (LaTeX-mode plain-tex-mode latex-mode doctex-mode) :help "Run LatexMk") ("TeX" "%(PDF)%(tex) %(file-line-error) %`%(extraopts) %S%(PDFout)%(mode)%' %(output-dir) %t" TeX-run-TeX nil (plain-TeX-mode AmSTeX-mode Texinfo-mode) :help "Run plain TeX")
("LaTeX" "%`%l%(mode)%' %T" TeX-run-TeX nil (LaTeX-mode docTeX-mode) :help "Run LaTeX") ("Makeinfo" "makeinfo %(extraopts) %(o-dir) %t" TeX-run-compile nil (Texinfo-mode) :help "Run Makeinfo with Info output")
("Makeinfo HTML" "makeinfo %(extraopts) %(o-dir) --html %t" TeX-run-compile nil (Texinfo-mode) :help "Run Makeinfo with HTML output") ("AmSTeX" "amstex %(PDFout) %`%(extraopts) %S%(mode)%' %(output-dir) %t" TeX-run-TeX nil (AmSTeX-mode) :help "Run AMSTeX")
("ConTeXt" "%(cntxcom) --once %(extraopts) %(execopts)%t" TeX-run-TeX nil (ConTeXt-mode) :help "Run ConTeXt once") ("ConTeXt Full" "%(cntxcom) %(extraopts) %(execopts)%t" TeX-run-TeX nil (ConTeXt-mode) :help "Run ConTeXt until completion")
("BibTeX" "bibtex %(O?aux)" TeX-run-BibTeX nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode ConTeXt-mode) :help "Run BibTeX") ("Biber" "biber %(output-dir) %s" TeX-run-Biber nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Run Biber")
("Texindex" "texindex %s.??" TeX-run-command nil (Texinfo-mode) :help "Run Texindex") ("Texi2dvi" "%(PDF)texi2dvi %t" TeX-run-command nil (Texinfo-mode) :help "Run Texi2dvi or Texi2pdf") ("View" "%V" TeX-run-discard-or-function t t :help "Run Viewer") ("Print" "%p" TeX-run-command t t :help "Print the file")
("Queue" "%q" TeX-run-background nil t :help "View the printer queue" :visible TeX-queue-command) ("File" "%(o?)dvips %d -o %f " TeX-run-dvips t (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Generate PostScript file")
("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Convert DVI file to PostScript") ("Dvipdfmx" "dvipdfmx -o %(O?pdf) %d" TeX-run-dvipdfmx nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Convert DVI file to PDF with dvipdfmx")
("Ps2pdf" "ps2pdf %f %(O?pdf)" TeX-run-ps2pdf nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Convert PostScript file to PDF") ("LaTeXMk" "latexmk %(latexmk-out) %(file-line-error) %(output-dir) %`%(extraopts) %S%(mode)%' %t" TeX-run-TeX nil (LaTeX-mode docTeX-mode) :help "Run LaTeXMk")
("Glossaries" "makeglossaries %(d-dir) %s" TeX-run-command nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Run makeglossaries to create glossary file") ("Index" "makeindex %(O?idx)" TeX-run-index nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Run makeindex to create index file")
("upMendex" "upmendex %(O?idx)" TeX-run-index t (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Run upmendex to create index file") ("Xindy" "texindy %s" TeX-run-command nil (plain-TeX-mode LaTeX-mode docTeX-mode AmSTeX-mode Texinfo-mode) :help "Run xindy to create index file")
("Check" "lacheck %s" TeX-run-compile nil (LaTeX-mode) :help "Check LaTeX file for correctness") ("ChkTeX" "chktex -v6 %s" TeX-run-compile nil (LaTeX-mode) :help "Check LaTeX file for common mistakes") ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil t :help "Spell-check the document")
("Clean" "TeX-clean" TeX-run-function nil t :help "Delete generated intermediate files") ("Clean All" "(TeX-clean t)" TeX-run-function nil t :help "Delete generated intermediate and output files") ("Other" "" TeX-run-command t t :help "Run an arbitrary command"))
)
[tex-previous-error.patch (text/x-patch, attachment)]
bug-auctex <at> gnu.org:bug#79037; Package auctex.
(Fri, 18 Jul 2025 09:16:02 GMT) Full text and rfc822 format available.Message #8 received at 79037 <at> debbugs.gnu.org (full text, mbox):
From: Arash Esbati <arash <at> gnu.org> To: bram.adams <at> queensu.ca Cc: 79037 <at> debbugs.gnu.org Subject: Re: bug#79037: 14.0.9; Fixing infinite loop with `TeX-previous-error' Date: Fri, 18 Jul 2025 11:15:43 +0200
Hi Bram, bram.adams <at> queensu.ca writes: > When `TeX-debug-warnings' and `TeX-suppress-ignored-warnings' are > enabled, invoking `TeX-previous-error' can lead to an infinite loop in > `TeX-parse-TeX'. As the `unless' condition always fails, `arg' is > never incremented to 0, hence the value of `TeX-error-last-visited' > decrements forever. There are no issues when invoking > `TeX-next-error'. > > The attached patch seems to fix this bug with `TeX-previous-error'. > [...] > diff --git a/tex.el b/tex.el > index 5a3345a..8f00bbc 100644 > --- a/tex.el > +++ b/tex.el > @@ -9491,13 +9491,16 @@ already in an Emacs buffer) and the cursor is placed at the error." > (1- TeX-error-last-visited)) > item (nth TeX-error-last-visited TeX-error-list)) > ;; Increase or decrease `arg' only if the warning isn't to be > - ;; skipped. > - (unless (TeX-error-list-skip-warning-p (nth 0 item) (nth 10 item)) > - ;; Note: `signum' is a function from `cl' library, do not be > - ;; tempted to use it. > - (setq arg (if (> arg 0) > - (1- arg) > - (1+ arg))))) > + ;; skipped, or `TeX-error-last-visited' has dropped below 0 > + ;; with a negative `arg'. > + (if (or (and (< arg 0) > + (< TeX-error-last-visited 0)) > + (not (TeX-error-list-skip-warning-p (nth 0 item) (nth 10 item)))) > + ;; Note: `signum' is a function from `cl' library, do not be > + ;; tempted to use it. > + (setq arg (if (> arg 0) > + (1- arg) > + (1+ arg))))) > (if (< TeX-error-last-visited -1) > (setq TeX-error-last-visited -1)) > (cond ((or (null item) Thanks for the report and the patch. Is it possible for you to assemble a small .tex file and an exact recipe how to trigger the inf-loop with that .tex file? I trust your analysis is correct, but like to understand it better before installing it. TIA. Best, Arash
bug-auctex <at> gnu.org:bug#79037; Package auctex.
(Fri, 18 Jul 2025 18:00:02 GMT) Full text and rfc822 format available.Message #11 received at 79037 <at> debbugs.gnu.org (full text, mbox):
From: bram.adams <at> queensu.ca To: Arash Esbati <arash <at> gnu.org> Cc: 79037 <at> debbugs.gnu.org Subject: Re: bug#79037: 14.0.9; Fixing infinite loop with `TeX-previous-error' Date: Fri, 18 Jul 2025 10:19:43 -0400
[Message part 1 (text/plain, inline)]
Hi Arash,
Thanks for the follow-up, I've attached a minimal latex example that contains:
- an ignored warning (about a package's options)
- a non-ignored warning (missing citation label)
After compiling, the infinite loop is triggered when invoking `TeX-previous-error' after invoking `TeX-next-error'.
These are the relevant configuration options:
==
(setq TeX-debug-warnings t
TeX-ignore-warnings #'my-ignore-TeX-warnings
TeX-suppress-ignored-warnings t)
(defun my-ignore-TeX-warnings (type file line text &rest more)
(let ((ref "LaTeX Warning: Reference")
(cit "LaTeX Warning: Citation"))
(and
(not (string-match-p ref text))
(not (string-match-p cit text)))))
==
Kind regards,
Bram Adams
[bla.tex (application/x-tex, attachment)]
[Message part 3 (text/plain, inline)]
Arash Esbati <arash <at> gnu.org> writes: > [You don't often get email from arash <at> gnu.org. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > Hi Bram, > > bram.adams <at> queensu.ca writes: > >> When `TeX-debug-warnings' and `TeX-suppress-ignored-warnings' are >> enabled, invoking `TeX-previous-error' can lead to an infinite loop in >> `TeX-parse-TeX'. As the `unless' condition always fails, `arg' is >> never incremented to 0, hence the value of `TeX-error-last-visited' >> decrements forever. There are no issues when invoking >> `TeX-next-error'. >> >> The attached patch seems to fix this bug with `TeX-previous-error'. >> [...] >> diff --git a/tex.el b/tex.el >> index 5a3345a..8f00bbc 100644 >> --- a/tex.el >> +++ b/tex.el >> @@ -9491,13 +9491,16 @@ already in an Emacs buffer) and the cursor is placed at the error." >> (1- TeX-error-last-visited)) >> item (nth TeX-error-last-visited TeX-error-list)) >> ;; Increase or decrease `arg' only if the warning isn't to be >> - ;; skipped. >> - (unless (TeX-error-list-skip-warning-p (nth 0 item) (nth 10 item)) >> - ;; Note: `signum' is a function from `cl' library, do not be >> - ;; tempted to use it. >> - (setq arg (if (> arg 0) >> - (1- arg) >> - (1+ arg))))) >> + ;; skipped, or `TeX-error-last-visited' has dropped below 0 >> + ;; with a negative `arg'. >> + (if (or (and (< arg 0) >> + (< TeX-error-last-visited 0)) >> + (not (TeX-error-list-skip-warning-p (nth 0 item) (nth 10 item)))) >> + ;; Note: `signum' is a function from `cl' library, do not be >> + ;; tempted to use it. >> + (setq arg (if (> arg 0) >> + (1- arg) >> + (1+ arg))))) >> (if (< TeX-error-last-visited -1) >> (setq TeX-error-last-visited -1)) >> (cond ((or (null item) > > Thanks for the report and the patch. Is it possible for you to assemble > a small .tex file and an exact recipe how to trigger the inf-loop with > that .tex file? I trust your analysis is correct, but like to > understand it better before installing it. TIA. > > Best, Arash
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