bug#73310: tree-sitter makes cpu 100%

[Yuan Fu]

> On Dec 20, 2024, at 12:37 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Fri, 20 Dec 2024 00:25:23 -0800
>> Cc: Eli Zaretskii <eliz@gnu.org>,
>> 73310@debbugs.gnu.org
>> 
>> 
>> 
>>> On Dec 19, 2024, at 1:34 PM, vinurs <hi@vinurs.me> wrote:
>>> 
>>> Hi,
>>> I tried version 0.25.0, and using the same method it doesn't always 
>>> reproduce the issue, but it still hangs. On the same line, if I repeatedly 
>>> delete and press space, it also hangs. I just haven't found a consistent 
>>> way to reproduce it yet.
>> 
>> Thanks. That’s bad news. I’ll also see if I can modify my C program to 
>> reproduce this.
> 
> Can we have a GDB backtrace when Emacs freezes like that?  If the
> freeze is inside tree-sitter, maybe build that with debug symbols, so
> that GDB shows information inside the library, and we could then try
> to figure out what causes this.

It’s almost certainly tree-sitter. And it’s unlikely for us to find the cause 
of the hang without considerable knowledge of tree-sitter internals.

Anyway, I’ll start with reproducing it reliably.

Yuan