bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Eli Zaretskii]

> From: Pip Cet <pipcet@gmail.com>
> Date: Sun, 24 May 2020 15:00:36 +0000
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 41321@debbugs.gnu.org
> 
> > FTR, I don't use that flavor of MinGW.
> 
> So your flavor is even more broken than what Debian ships?

Why _more_ broken?

> That's interesting, which flavor is it?

mingw.org's MinGW.

> > Isn't that strange?  Lisp data is allocated via lmalloc, AFAIK, and
> > lmalloc is supposed to guarantee LISP_ALIGNMENT alignment.  Or am I
> > missing something?
> 
> No, it relies on the compile-time constants and never checks.

So that is the bug to fix, no?

> > I still very much doubt that this has anything to do with stack
> > marking during GC, since I've shown in my backtrace that
> > current_buffer->overlays_before points to an overlay with invalid
> > markers.
> 
> You haven't.

Of course, I have.