How to report a bug in LuaTeX?

Question

I think I found a bug in LuaLaTeX. I use the current version from TeX Live 2012.

lualatex --version
This is LuaTeX, Version beta-0.70.2-2012052410 (TeX Live 2012)

When I compile the following document

\documentclass{standalone}
\begin{document}
$\displaystyle\sqrt{\sum_{k=1}^{n} x_k}$
\end{document}

it works fine with pdflatex; correct formula .

But with lualatex I get bad rendering .

So, where should I report this? And how can I get around it?

this looks quite similar to how-can-i-debug-this-problem-with-math-typesetting — cmhughes, Commented Aug 12, 2012 at 21:46
The LuaTeX bug tracker can be found at tracker.luatex.org/my_view_page.php — Torbjørn T., Commented Aug 12, 2012 at 21:55
This bug seems to be fixed upstream: Debian's version does exhibit the bug and has "pick from upstream luatex-svn: fix rendering of radicals with old fonts (Closes: #680015)" in its changelog. — cebewee, Commented Aug 13, 2012 at 1:57
@StephanLukasczyk The question was closed in 2013, and was just reopened an hour ago; I posted my comment above before voting to reopen. — ShreevatsaR, Commented Dec 5, 2017 at 8:28

Community · Accepted Answer · 2017-04-13 12:34:39Z

There are several ways.

The first is, as @Torbjørn T. mentions, the bug tracker at http://tracker.luatex.org/my_view_page.php.
There is of course the mailing list, you can subscribe to at http://tug.org/mailman/listinfo/luatex. It might be easier to discuss the problem there first, and the developers of LuaTeX are members of the list
There is tex.stackexchange.com, a q&a site where you can discuss the problem you are experiencing. Several regular members of tex.sx are willing to put a bug on the tracker if you can't do it.
If for some reason you can't at any circumstances make a public bug report, I am sure the authors of LuaTeX won't mind a private email. This has to be within reason, of course.

General rules apply to bug reports:

Post what you experience and what you expect instead
give a MWE, a minimal working example that shows the problem. Preferable it should work under plain LuaTeX, but ConTeXt or LaTeX might be OK, if the problem can't be reduced. The more dependencies (luaotfload for example), the more difficult it is to find the culprit.
Use the newest version that is available (if possible). Always report the platform (Mac/Windows/Linux) and the version number (luatex --version) and distribution.

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