bug#52657: 27.2; 27.2: Emacs crashes with show-paren-mode active

[Lars Ingebrigtsen]

Raffael Stocker <r.stocker@mnet-mail.de> writes:

> my Emacs segfaults with certain show-paren settings.  To reproduce:
>
> run emacs -Q
>
> Evaluate the following forms:
> (show-paren-mode 1)
> (setq show-paren-when-point-in-periphery t)
> (setq show-paren-style 'mixed)
>
> Then type ‘C-h i’, then ‘1’ to bring up the first info manual, then
> ‘C-p’ to go to the previous line, which has the name of the manual in
> parentheses.  This makes my Emacs crash, both in terminal and X.
>
> The two show-paren options both seem to be required for Emacs to crash.

Thanks for the clear recipe for reproduction.

I can reproduce this problem in Emacs 27.2, too, but not in Emacs 28, so
it sounds like this has been fixed.  Would it be possible for you to
build Emacs 28 to confirm this?

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   bloggy blog: http://lars.ingebrigtsen.no