bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs

[Eli Zaretskii]

> From: Michael Welsh Duggan <mwd@cert.org>
> Date: Wed, 07 Apr 2021 14:31:51 -0400
> Cc: Michael Welsh Duggan <mwd@md5i.com>,
>  "schwab@linux-m68k.org" <schwab@linux-m68k.org>,
>  "47244@debbugs.gnu.org" <47244@debbugs.gnu.org>
> 
>  As usual, when triggering this, I had turned off the VPN, and Gnus hung
> when trying to fetch mail or news over an existing connection.  I typed
> C-g a couple of times to get back interactivity.  This is when the
> assert happened.

Maybe we lack an unwind-protect somewhere?