Subject: bug#55068: 29.0.50; crashes when trying to set default font

From: Eli Zaretskii <[email-masked]>
Date: Mon, 25 Apr 2022 05:29:44 +0300

> Resent-From: Po Lu <[email-masked]>
> Original-Sender: "Debbugs-submit" <[email-masked]>
> Resent-CC: [email-masked]
> Resent-Sender: [email-masked]
> Date: Mon, 25 Apr 2022 08:38:25 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email-masked]>
> 
> Gregor Zattler <[email-masked]> writes:
> 
> > It does not crash for you?
> 
> Yes, it doesn't.  What's the value of `specpdl_ptr' and `specpdl'?

It looks like there's some memory-related problem there, because
xbacktrace also fails due to inaccessible memory.  Likely
SPECPDL_INDEX bumps into the same problem.

Not sure how such a memory problem could be caused, though.  If this
is easily reproduced, perhaps bisecting will help?