bug#39962: 27.0.90; Crash in Emacs 27.0.90

[Pip Cet]

On Tue, Mar 10, 2020 at 10:53 AM Pieter van Oostrum
<pieter-l@vanoostrum.org> wrote:
> I think we got stuck here. I don't think the problem is in the actual code 
> that Emacs was executing at this point. Rather, the problem was that a marker 
> was corrupted (m->charpos == 0).

Inspecting the rest of the marker structure, in particular the header,
might let us know whether, as I suspect, the marker was wrongly freed
and re-allocated.

What does "x/32gx marker" produce?