bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'

[Alexander Shukaev]

On 03/09/2020 14:13, Robert Pluim wrote:
> > > > > > On Thu, 3 Sep 2020 12:24:30 +0200, Alexander Shukaev 
> > > > > > <emacs@Alexander.Shukaev.name> said:
>
>      Alexander> The only related font configurations that I can think of are 
> the following:
>
>      Alexander> With what I consistently get output
>
>      Alexander> Font: ‘Consolas-12’
>
>      Alexander> for several years already on various Linux systems that I'm 
> using so far.
>
> OK. Is this happening on particular files? Is it possible they have
> esoteric Unicode characters in them?
>
> One other thing: do you have Symbola installed? Thatʼs the default
> fallback font Emacs uses for symbols, if itʼs not found it needs to
> search harder.
>
> Robert

That file is indeed special because it has some Unicode:

ꪯ鵞

Symbola was there, though outdated, I just updated it.  Not sure if it's 
related, but now that file loads somewhat faster, under 10 seconds roughly.