bug#23368: 25.0.92; xftfont.c has got a bug

[Eli Zaretskii]

Ping!

> Date: Mon, 25 Apr 2016 11:00:36 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 23368@debbugs.gnu.org
> 
> > Date: Mon, 25 Apr 2016 15:02:40 +0900
> > From: Masaru Nomiya <nomiya@galaxy.dti.ne.jp>
> > 
> > Hello,
> > 
> > With Emacs 25.0.92, Emacs 25.0.93, and Emacs 25.1.50, Emacs start to
> > use 100% CPU.
> > That is, afetr I start Wanderlust(MUA) on Emacs, and try to open some
> > folders in it, Emacs starts to use 100% CPU, and unresposible.
> > 
> > I investigated the latest Emacs with git bisect.
> > As a result, I found that xftfont.c has got a bug as follows.
> 
> CC'ing Handa-san.  This seems to be a duplicate of bug#23360.  Can you
> tell which font(s) are used by Wanderlust when this happens?
> 
> > --------------------------------------------------------------------
> > masaru@linux-uw5l:/tmp/tes/emacs> git checkout emacs-25
> > Branch emacs-25 set up to track remote branch emacs-25 from origin.
> > Switched to a new branch 'emacs-25'
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> git bisect start
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> git bisect bad
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> git bisect good emacs-25.0.91
> > Bisecting: 182 revisions left to test after this (roughly 8 steps)
> > [04f5525fbb961f6006280be340ca0f03df9e80a7] Make '.' associative, for easier 
> > sexp navigation
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> ./autogen.sh
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> ./configure
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> make bootstrap -j10
> > 
> > test --  NG
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> make clean
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> git bisect bad
> > Bisecting: 90 revisions left to test after this (roughly 7 steps)
> > [06a872b71d6580e0699600844bb9526602437990] Fix redisplay on a TTY after 
> > 'make-frame'
> > [...]
> > masaru@linux-uw5l:/tmp/tes/emacs> make bootstrap -j10
> > 
> > test  --  OK
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> make clean
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> git bisect good
> > Bisecting: 0 revisions left to test after this (roughly 1 step)
> > [ec10ef95cf2a5309ec7cb74f1383860a13daa546] * lisp/apropos.el 
> > (apropos-variable): Doc fix.  (Bug#22813).
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> make bootstrap -j10
> > 
> > test  --  NG
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> make clean
> > 
> > masaru@linux-uw5l:/tmp/tes/emacs> git bisect bad
> > Bisecting: 0 revisions left to test after this (roughly 0 steps)
> > [d2dd614716e34edb5891e58c029741cd6b32217d] Remove unneeded workaround in 
> > xftfont.c
> > 
> > ---------------------------------------------------------------------
> > 
> > ※ test = Start Emacs & Wanderlust, then try to open the folder in
> > Wanderlust. OK means "can open without any problem", NG means "Emacs
> > eat 100% CPU).
> 
> Thanks, I hope Handa-san will be able to suggest a solution.  Failing
> that, the only way out of this mess I can see is introduce a variable
> that will control whether we employ that workaround in xftfont.c, and
> let users whose fonts need this customize that variable.
> 
> 
> 
>