bug#38748: 28.0.50; crash on MacOS 10.15.2

[Eli Zaretskii]

> From: Pieter van Oostrum <pieter-l@vanoostrum.org>
> Date: Sat, 11 Jan 2020 19:37:02 +0100
> Cc: Pip Cet <pipcet@gmail.com>, jguenther@gmail.com, alan@idiocy.org,
>  andreyk.mad@gmail.com, 38748@debbugs.gnu.org
> 
> Robert Pluim <rpluim@gmail.com> writes:
> 
> >     Pip> diff --git a/src/nsterm.m b/src/nsterm.m
> >     Pip> index 03754e5ae5..c1d1d41117 100644
> >     Pip> --- a/src/nsterm.m
> >     Pip> +++ b/src/nsterm.m
> >     Pip> @@ -1644,6 +1644,7 @@ Hide the window (X11 semantics)
> >     Pip>    [view release];
> >  
> >     Pip>    xfree (f->output_data.ns);
> >     Pip> +  f->output_data.ns = NULL;
> >  
> >     Pip>    unblock_input ();
> >     Pip>  }
> >
> > That has fixed things for me, not been able to crash it with Andrii's
> > recipe (I had to increase the number of frames to get it to crash).
> >
> > Robert
> 
> I compiled HEAD with this patch applied, and it still crashed but with the 
> other crash cause (in Fmouse_pixel_position).

Can you show the values of variables I asked about regarding that
crash?