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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: Thu, 3 Sep 2020 11:50:53 +0200
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On 03/09/2020 11:40, Alexander Shukaev wrote:
> (gdb) f 7
> #7  0x0000555555a8d875 in xfont_supported_scripts 
> (display=0x555556594940, fontname=0x55556a79e428 "-misc-trirong 
> medium-medium-i-normal--0-0-0-0-p-0-iso10646-1", props=XIL(0x7ffff27926e5),
>      encoding=0x7ffff23ab8d0) at xfont.c:266
> 266          xfont = XLoadQueryFont (display, fontname);
> (gdb) pp fontname
> #<INVALID_LISP_OBJECT 0x55556a79e428>
> (gdb) pp fontname
> #<INVALID_LISP_OBJECT 0x55556a79e428>
> (gdb) p fontname
> $3 = 0x55556a79e428 "-misc-trirong 
> medium-medium-i-normal--0-0-0-0-p-0-iso10646-1"
> (gdb)

It appears to always be different `fontname' here as I try multiple 
times to reproduce.  Maybe it's not really hanging but is merely 
ultra-slow somehow in looping over the fonts here.  Any ideas?