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

[Eli Zaretskii]

> Date: Thu, 13 Apr 2023 09:55:42 +1000
> From: Nick Urbanik <nicku@nicku.org>
> Cc: 62794@debbugs.gnu.org
> 
> >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.
> 
> It turns out that it is not the size, but some pathological
> arrangement of the code.  I have provided a much smaller sample here
> that I can reproduce the problem with by:
> 
> 1. Move the cursor to below the from elesewhere import ... line.
> 2. Press Enter
> 3. Type:
> def function():
>      """
> 
> 4. At this point, CPU usage goes to 100%, I cannot type anything else
> into the buffer, but I can send a USR2 signal to end the 100% CPU
> usage, but the buffer has only partial syntax colouring.

OK, thanks.  I can indeed reproduce this in Emacs 28.2, but not in
what soon will become Emacs 29.1.  So I think this problem was already
solved between these two version.

> >I suspect this is already fixed in Emacs 29, but I cannot verify
> >without a file that reproduces the problem in Emacs 28.
> 
> I will build an RPM package of emacs 29 and test that.

Thanks.  I will wait for your confirmation before closing the bug as
fixed.