bug#62794: 28.2; jit-lock-function enters busy loop when open """ near top of large Python program

[Eli Zaretskii]

> Date: Wed, 12 Apr 2023 17:05:13 +1000
> From: Nick Urbanik <nicku@nicku.org>
> 
> 
> 
> 1. Start emacs with emacs -Q
> 2. Read in a large python file (3100 lines long, more than 10,000
>     characters)

Thanks.

Please post such a file, or a URL where it could be downloaded.  I
couldn't easily find such a large file on my system.

> 3. Near the top, type the following:
> 
> def function():
>     """
> 
> 4. No further input is accepted.
> 5. CPU usage is 100% as shown in /usr/bin/top
> 6. type kill -USR2 {process_id_of_emacs-Q}
>     and the emacs window closes.
> 7. From my emacs started without '-Q', when I type
>     killall -USR2 emacs
>     I see:
> Debugger entered--entering a function:

I suspect this is already fixed in Emacs 29, but I cannot verify
without a file that reproduces the problem in Emacs 28.