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

From	Alexander Shukaev <emacs@Alexander.Shukaev.name>
Newsgroups	gnu.emacs.bug
Subject	bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'
Date	2020-09-03 14:28 +0200
Message-ID	<mailman.2181.1599136207.2469.bug-gnu-emacs@gnu.org> (permalink)
References	(7 earlier) <28ddec32-bee2-e6fd-d572-b09766f2be37@Alexander.Shukaev.name> <m2wo1b18ea.fsf@gmail.com> <20b43a48-2aac-032b-8bdf-16dffb25de99@Alexander.Shukaev.name> <m2sgbz12k0.fsf@gmail.com> <e8f008d7-bfd8-78e0-2061-9a2c153fe9eb@Alexander.Shukaev.name>

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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Symbola was there, though outdated, I just updated it.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.

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bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1' Alexander Shukaev <emacs@Alexander.Shukaev.name> - 2020-09-03 14:28 +0200

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