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From: Robert Pluim <rpluim@gmail.com>
Newsgroups: gnu.emacs.bug
Subject: bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'
Date: Thu, 03 Sep 2020 12:06:53 +0200
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References: <7bb2d5e3-1abf-08d6-d7c8-0f1bd139815e@Alexander.Shukaev.name> <m2y2lr2uaw.fsf@gmail.com> <caae0787-d1bb-b4bf-93ff-c9e7f7147964@Alexander.Shukaev.name> <f0398105-c575-bcd7-0daa-54c6e1b2dbe9@Alexander.Shukaev.name> <m2mu272ppt.fsf@gmail.com> <3598262d-b65c-b1b4-310a-29149fd89ebf@Alexander.Shukaev.name> <04c384ac-bfbe-6073-829c-20712053bb1d@Alexander.Shukaev.name> <28ddec32-bee2-e6fd-d572-b09766f2be37@Alexander.Shukaev.name> <m2wo1b18ea.fsf@gmail.com>
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To: Alexander Shukaev <emacs@Alexander.Shukaev.name>
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Xref: csiph.com gnu.emacs.bug:134818

>>>>> On Thu, 3 Sep 2020 11:53:05 +0200, Alexander Shukaev <emacs@Alexander=
.Shukaev.name> said:

    Alexander> On 03/09/2020 11:50, Alexander Shukaev wrote:
    >> On 03/09/2020 11:40, Alexander Shukaev wrote:
    >>> (gdb) f 7
    >>> #7=C2=A0 0x0000555555a8d875 in xfont_supported_scripts
    >>> (display=3D0x555556594940, fontname=3D0x55556a79e428 "-misc-trirong
    >>> medium-medium-i-normal--0-0-0-0-p-0-iso10646-1",
    >>> props=3DXIL(0x7ffff27926e5),
    >>> =C2=A0=C2=A0=C2=A0=C2=A0 encoding=3D0x7ffff23ab8d0) at xfont.c:266
    >>> 266=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xfont =3D=
 XLoadQueryFont (display, fontname);
    >>> (gdb) pp fontname
    >>> #<INVALID_LISP_OBJECT 0x55556a79e428>
    >>> (gdb) pp fontname
    >>> #<INVALID_LISP_OBJECT 0x55556a79e428>
    >>> (gdb) p fontname
    >>> $3 =3D 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.=C2=A0 Maybe it's not really hanging but is merely
    >> ultra-slow somehow in looping over the fonts here.=C2=A0 Any ideas?

    Alexander> Hmm, right, waited for about a minute or so, and the file go=
t opened
    Alexander> finally.  Reopening it was instant as well as if something g=
ot
    Alexander> cached/loaded already.  So any ideas how to speed things up =
here?  I
    Alexander> don't think I've encountered that with 26.3...

You can check easily enough by building emacs-27 --without-cairo, that
should get you back to emacs-26's font handling.

The issue is: why is Emacs falling back to the 'x' backend?

Robert