Bug#916349: Happens with other xterm clients as well

[Sven Joachim <svenjoac@gmx.de>]

On 2018-12-21 17:49 +0100, Philipp Marek wrote:

> I'm using
>
>     !XTerm*faceName: DejaVu Sans Mono
>
> and my xterm -> mosh -> screen -> irssi crashes reproducibly when resizing 
> the window in the irssi tab. At least it did so 10 times in a row before
> starting to reply here ;)
>
> Yeah, and now it happens again - resizing the window _sometimes_ works
> in a plain shell window, in the IRSSI window it reproducibly crashes.
>
>
> Another font file is being opened, though:
>
>     13967 17:30:55.114945 openat(AT_FDCWD, "/usr/share/fonts/truetype/noto/NotoColorEmoji.ttf", O_RDONLY) = 5

That's the font which triggers the problem.  Uninstalling the
fonts-noto-color-emoji works around it.

> No missing glyphs that I know of ... how would I see them?

At least not with xfd(1) because it shows the same allergic reaction as
xterm:

,----
| $ xfd -fa 'Noto Color Emoji'
| X Error of failed request:  BadLength (poly request too large or internal Xlib length error)
|   Major opcode of failed request:  139 (RENDER)
|   Minor opcode of failed request:  20 (RenderAddGlyphs)
|   Serial number of failed request:  226
|   Current serial number in output stream:  484
`----

See also #892611 in Emacs.

Cheers,
       Sven