Comment #91 on issue 12530 by yusu...@chromium.org: Segfault when
ResourceBundle::GetFont fails -- more font fallback needed?
http://code.google.com/p/chromium/issues/detail?id=12530
agl:
I finally succeeded to reproduce it (hopefully). In short, I guess <edit
mode="prepend" binding="same"> or <edit mode="prepend" binding="weak"> in
their
fontconfig configurations might trigger this bug.
For example, if a user has a ~/.fonts.conf file (or
~/.fonts.conf.d/foo.conf or
/etc/fonts/conf.d/bar.conf file?) which looks like:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<match target="pattern">
<edit mode="prepend" binding="same" name="family"> <!-- or
binding="weak" -->
<string>DejaVu Sans</string> <!-- always prefer DejaVu Sans -->
</edit>
</match>
</fontconfig>
and the user sets the Application Font to "Bitstream Vera Sans" (or any
fonts other
than "DejaVu Sans") using /usr/bin/gnome-appearance-properties command,
chromium
fails to start with the error:
[8513:8513:2971107470385:FATAL:/usr/local/google/home/yusukes/chromium_rw2/src/app/gfx/font_skia.cc(90)]
Check failed: tf. Could not find font: Bitstream Vera Sans
Trace/breakpoint trap
This is because |post_config_family| in FontConfigDirect::Match
becomes "DejaVu
Sans" while |post_match_family| remains "Bitstream Vera Sans" for unclear
reasons.
My environment: gHardy 8.04 64bit
$ dpkg -l fontconfig | grep fontconfig
ii fontconfig 2.5.0-2ubuntu3
generic font configuration library - support
binaries
$ printenv | egrep -e '(LANG|LC_)'
LC_MONETARY=C
LC_NUMERIC=C
LC_COLLATE=C
LANG=en_US.UTF-8
GDM_LANG=en_US
LC_TIME=C
$ fc-list | egrep -r '(Bitstream Vera Sans|DejaVu Sans)'
Bitstream Vera Sans Mono:style=Bold
DejaVu Sans,DejaVu Sans Condensed:style=Condensed Oblique,Oblique
DejaVu Sans Mono:style=Bold Oblique
Bitstream Vera Sans:style=Oblique
Bitstream Vera Sans:style=Roman
DejaVu Sans:style=Bold Oblique
Bitstream Vera Sans Mono:style=Oblique
DejaVu Sans:style=Oblique
Bitstream Vera Sans:style=Bold
DejaVu Sans Mono:style=Oblique
DejaVu Sans,DejaVu Sans Condensed:style=Condensed Bold Oblique,Bold Oblique
DejaVu Sans,DejaVu Sans Light:style=ExtraLight
Bitstream Vera Sans Mono:style=Bold Oblique
Bitstream Vera Sans:style=Bold Oblique
Bitstream Vera Sans Mono:style=Roman
DejaVu Sans,DejaVu Sans Condensed:style=Condensed,Book
DejaVu Sans,DejaVu Sans Condensed:style=Condensed Bold,Bold
DejaVu Sans:style=Bold
DejaVu Sans:style=Book
DejaVu Sans Mono:style=Book
DejaVu Sans Mono:style=Bold
$ fc-match -s "Bitstream Vera Sans" | head -10
Vera.ttf: "Bitstream Vera Sans" "Roman"
DejaVuSans.ttf: "DejaVu Sans" "Book"
DejaVuSans-ExtraLight.ttf: "DejaVu Sans" "ExtraLight"
DejaVuSans-Bold.ttf: "DejaVu Sans" "Bold"
DejaVuSans-Oblique.ttf: "DejaVu Sans" "Oblique"
DejaVuSans-BoldOblique.ttf: "DejaVu Sans" "Bold Oblique"
Verdana.ttf: "Verdana" "Normal"
Arial.ttf: "Arial" "Normal"
luxisr.ttf: "Luxi Sans" "Regular"
n019003l.pfb: "Nimbus Sans L" "Regular"
$ FC_DEBUG=1 fc-match "Bitstream Vera Sans"
FC_DEBUG=1
FC_DEBUG=1
Match Pattern has 17 elts (size 32)
family: "DejaVu Sans"(w) "Bitstream Vera Sans"(s) "DejaVu
Sans"(w) "Bitstream
Vera Sans"(w) "Verdana"(w) "Arial"(w) "Liberation Sans"(w) "Albany
AMT"(w) "Luxi
Sans"(w) "Nimbus Sans L"(w) "Helvetica"(w) "Liberation Sans"(w) "WenQuanYi
Zen
Hei"(w) "AR PL UMing HK"(w) "AR PL UMing CN"(w) "Khmer
OS"(w) "Nachlieli"(w) "MgOpen
Modata"(w) "VL Gothic"(w) "IPAMonaGothic"(w) "IPAGothic"(w) "Sazanami
Gothic"(w)
"Kochi Gothic"(w) "AR PL KaitiM GB"(w) "AR PL KaitiM Big5"(w) "AR PL
ShanHeiSun
Uni"(w) "AR PL SungtiL GB"(w) "AR PL Mingti2L Big5"(w) "ＭＳゴシック"(w)
"ZYSong18030"(w) "Baekmuk Dotum"(w) "Baekmuk
Gulim"(w) "SimSun"(w) "KacstQura"(w)
"Lohit Bengali"(w) "Lohit Gujarati"(w) "Lohit Hindi"(w) "Lohit
Punjabi"(w) "Lohit
Tamil"(w) "Lohit Malayalam"(w) "Lohit Kannada"(w) "Lohit Telugu"(w) "Lohit
Oriya"(w)
"LKLUG"(w) "sans-serif"(w) "Waree"(w) "Loma"(w) "Garuda"(w) "Roya"(w)
"Koodak"(w)
"Terafik"(w)
^^^
The first font in the list is "DejaVu Sans", while the matched font
is "Bitstream
Vera Sans".
--Yusuke
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