bug#39962: 27.0.90; Crash in Emacs 27.0.90

[Eli Zaretskii]

> Date: Sat, 7 Mar 2020 00:55:39 +0100
> From: Pieter van Oostrum <pieter@vanoostrum.org>
> 
> I got a segmentation fault in Emacs. I read my email with VM (Viewmail), and 
> I had a few fairly large mailboxes open when Emacs crashed. I had a few other 
> cases where it crashed under similar circumstances, but other cases where it 
> ran without problems.
> 
> I have the crashed instance under gdb, and I will keep it some time there to 
> be able to extract more info. For the time being it looks like it is in the 
> garbage collector.
> 
> The backtrace is very large, so it could be a stack overflow.

Please show the first few backtrace frames (with "bt 10", for
example), they are important for trying to figure out whether this was
a stack overflow or something else.

What is the max stack size of your Emacs binary?