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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs
Date: Mon, 29 Mar 2021 18:07:18 +0300
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> Date: Mon, 29 Mar 2021 18:02:24 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: mwd@md5i.com, schwab@linux-m68k.org, 47244@debbugs.gnu.org
> 
> Any idea where could be the Lisp code that switches from " *nntpd*" to
> the buffer in the currently selected window?  Perhaps some
> with-current-buffer thing somewhere?

Actually, no, I don't think it can be with-current-buffer, it must be
something else.  I wonder how we ended up being at top-level with
current buffer being " *nntpd*" and the selected window's buffer being
something else, which was killed?  Hmm...