bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Eli Zaretskii]

> Cc: 41321@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Sat, 16 May 2020 09:33:35 -0700
> 
> I fooled around a bit with emacs-27 on Ubuntu 18.04.4 (compiled in 32-bit mode
> --with-wide-int) and couldn't reproduce it. I'll keep trying.

Yes, I didn't succeed reproducing it on purpose, either.  Not sure
why, maybe there's some other factor that is at work, e.g. how many
markers are there in the buffer.

> Could you give more details about the failures you observed? That might help
> attempts at reproducing. How did you revert your info buffer - was it by 
> typing
> "M-x revert-buffer"? Are you using auto-revert-mode? That sort of thing.

Just "M-x revert-buffer RET" followed by 'y'.  I don't use
auto-revert-mode.

In the Git case, I would usually switch to a buffer visiting the file,
perhaps via "M-.", and Emacs would ask me whether to re-read the file
into its buffer, I'd say yes, and then I see an error about a bad
marker; the next command would abort Emacs.