GNU bug report logs - #71929
30.0.60; crash in mark_image_cache

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From: Eli Zaretskii <eliz <at> gnu.org>
To: spwhitton <at> spwhitton.name
Cc: Po Lu <luangruo <at> yahoo.com>, 71929 <at> debbugs.gnu.org
Subject: bug#71929: 30.0.60; crash in mark_image_cache
Date: Thu, 04 Jul 2024 09:03:06 +0300

> Cc: 71929 <at> debbugs.gnu.org
> Date: Thu, 04 Jul 2024 08:53:41 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: Sean Whitton <spwhitton <at> spwhitton.name>
> > Date: Thu, 04 Jul 2024 10:44:04 +0800
> > 
> > Hello,
> > 
> > On Thu 04 Jul 2024 at 10:33am +08, Sean Whitton wrote:
> > 
> > > My pgtk Emacs keeps crashing.  This time I think I caught it.
> > > I see there was a recent commit to code around here; if this backtrace
> > > is not sufficient, I can try bisecting, but I cannot currently reproduce
> > > the crash reliably.
> > >
> > > Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
> > > 0x00005555557a2c51 in mark_image_cache (c=0x55555729fc70) at image.c:3775
> > > 3775		if (c->images[i])
> > > (gdb)
> > 
> > ... and i was 0, i.e. it crashes on the first iteration.
> 
> What is the value of c->images?  IOW, why did this line segfault?

Also, what is the value of c->refcount?

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