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Re: Crash with --enable-checking and some glyphs

From: Lars Ingebrigtsen
Subject: Re: Crash with --enable-checking and some glyphs
Date: Wed, 24 Nov 2021 18:01:27 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Lars Ingebrigtsen <larsi@gnus.org> writes:

> No, of course that wasn't it.  It was --enable-checking.  D'oh.
> So I'm now able to reproduce the problem on the faster build machine,
> which should help.  

I assumed that this problem had to be pretty recent, but I'm now back to 


(which is December 31sth 2020), and the abort is still there:

xdisp.c:31003: Emacs fatal error: assertion failed: it->ascent >= 0 && 
it->descent >= 0
Fatal error 6: Aborted

So perhaps it's more productive to try to debug it than trying to chase
the problem down, but before I do that: Is anybody else seeing this?

The way to reproduce it is:

./configure --enable-checking
./src/emacs /tmp/crash.txt

where that file contains the contents of:


I'm reproducing this on Debian/bullseye and Debian/bookworm.

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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