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bug#31316: Emacs hangs in `font_open_entity'

From: Eli Zaretskii
Subject: bug#31316: Emacs hangs in `font_open_entity'
Date: Sat, 05 May 2018 11:55:39 +0300

> Date: Mon, 30 Apr 2018 22:20:13 +0200 (CEST)
> Cc: address@hidden
> From: Werner LEMBERG <address@hidden>
> >> Sort of, thanks.  After waiting a few seconds, Emacs now displays
> >> three characters, but navigation is hard: it takes a few seconds to
> >> move from character to character (I guess Emacs tries to reload the
> >> missing glyph again and again).
> > 
> > Well, maybe I went overboard with the 100 figure, and we should use
> > a much smaller number, like 10 or 20?
> Maybe, yes.  I don't know enough of Emacs code to have an opinion on
> that.

I eventually went with 15.  Pushed to the master branch.

> The font is called `emmentaler-brace.otf' (part of lilypond,
> containing system braces for musical scores).  However, I wonder how
> this font can ever be considered as a fallback, since its SFNT (3,1)
> Unicode cmap contains only PUA character codes in the range
> 0xe100-0xe33f (and `fc-list -v' correctly lists that).  In other
> words, this font definitely doesn't contain anything relevant to the
> CJK character codes originally reported.

I asked for a backtrace from that loop:

> Please show a C-level backtrace from a breakpoint in that loop.  And
> if the breakpoint breaks more than once when you do nothing after
> invoking Emacs as shown in your OP, please show the backtraces from
> all the times that breakpoint breaks.
> Maybe looking at the backtrace will help us understand why Emacs
> attempts to open that font.

Can you please produce that?  I'd like to close this bug report, but
maybe the backtrace will show us that something else should be done


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