bug#71929: 30.0.60; crash in mark_image_cache

[Eli Zaretskii]

> Date: Tue, 9 Jul 2024 13:48:32 +0800
> From: Sean Whitton <spwhitton@spwhitton.name>
> Cc: 71929@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> 
> On Sun, Jul 07, 2024 at 09:47:28PM +0800, Po Lu wrote:
> 
> > I must ask you to bear with me again, as another detail was not
> > correctly accounted for in the last patch.  Please retry with this:
> 
> This just crashed.  Apparent trigger was 'emacsclient -t', this time.
> 
> verify_image_cache_refcount is not in the backtrace.
> 
> I should be able to keep it open in a stable build of Emacs for at least 24h
> if you'd like to ask for more.

Thanks.  How many frames, approximately, were alive in this session
when it crashed?