bug#22146: Stack overflow in reftex-parse-all

[Mosè Giordano]

Hi Nils,

2015-12-11 22:03 GMT+01:00 Nils Kanning :
> Dear all,
>
> I encounter the error "Stack overflow in regexp matcher" if I apply the
> function reftex-parse-all to the following file:
>
> \documentclass{article}
> \begin{document}
> [\}
> foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo
> ...
> foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo
> \end{document}
>
> Here ... stands for 500 copies of the line above. The file can be
> compiled successfully with pdflatex.
>
> I am using the Debian packages emacs24 24.5+1-3 and auctex 11.88-1.1.
> The same error also occurs with different versions.

We've recently released AUCTeX 11.89, you can grab it from ELPA ;-)

> In case you are wondering, the non-matching brackets [\} appear for
> example in physics as so-called "super Lie brackets".

Thanks for taking the time to report this bug, I can reproduce it.
The culprit is the

(re-search-forward (reftex-everything-regexp) nil t)

within the `reftex-with-special-syntax' macro in
`reftex-parse-from-file' function.  Actually in the code it is called
as

(re-search-forward regexp nil t)

I wrote the above line for ease of reproduction.

Of course `reftex-everything-regexp' is an undocumented function that
returns one of two undocumented variables.  I can reproduce the bug
only if `reftex-support-index' is non-nil, so in the end the culprit
is `reftex-everything-regexp'.

There is a simple workaround you can put in your code: close the
brackets, also in a comment is fine:

[\} % ]

But I don't know how to really fix the bug, it's too late for me to
decrypt that regexp now.  Having a clue of what it should *exactly*
match would be of great help.

Bye,
Mosè



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bug#22146: Stack overflow in reftex-parse-all

[Nils Kanning]

Dear all,

I encounter the error "Stack overflow in regexp matcher" if I apply the
function reftex-parse-all to the following file:

\documentclass{article}
\begin{document} 
[\}
foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo
...
foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo foo
\end{document}

Here ... stands for 500 copies of the line above. The file can be
compiled successfully with pdflatex.

I am using the Debian packages emacs24 24.5+1-3 and auctex 11.88-1.1.
The same error also occurs with different versions.

In case you are wondering, the non-matching brackets [\} appear for
example in physics as so-called "super Lie brackets".

Best
Nils



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bug#22146: Stack overflow in reftex-parse-all

[Tassilo Horn]

Mosè Giordano  writes:

Hi Nils & Mosé,

>> In case you are wondering, the non-matching brackets [\} appear for
>> example in physics as so-called "super Lie brackets".
>
> Thanks for taking the time to report this bug, I can reproduce it.

I can reproduce it with Emacs 24.5 but not with Emacs 25.0.50.16 from
the current emacs-25 branch.  So maybe it has been fixed after the last
release (either the regex, or the Emacs regex matcher has become
better).

If anyone of you could try with Emacs 25 and report back, that'd be
great.

> There is a simple workaround you can put in your code: close the
> brackets, also in a comment is fine:
>
> [\} % ]
>
> But I don't know how to really fix the bug, it's too late for me to
> decrypt that regexp now.  Having a clue of what it should *exactly*
> match would be of great help.

Obviously, it should match everything that's interesting to reftex. :-)

But seriously, have a look at the bottom of `reftex-compile-variables'
where `reftex-everything-regexp' is composed from several other regexes
with more local scopes, e.g., one for matching labels, one for sections,
one for index entries, etc.

Bye,
Tassilo



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