About two months ago KMail crashed on me when I tried to reply to an email that contained a few Arabic characters. A few weeks later Konvi did the same thing when someone wrote a line in Arabic. Both crashes were reproducible. However, compiling qt, kdelibs and both apps with debugging symbols produced no usable backtraces. Last week Konqueror crashed with an "Error, can't load libthai" on just about any substantial Wikipedia page. Googling for this error, finally a post by Will Simoneau (http://lkml.org/lkml/2006/7/23/84) pointed out what the problem was: qt-3.3.6-r1 compiled with SSP. When qt-3.3.6-r1 is compiled _without_ SSP, KMail and Konqueror do not crash any more on Arabic or Thai. Also when using qt-3.3.4-r8 instead (compiled with SSP), there are no more crahes. So I guess this is a case of bug #135265. emerge --info: Gentoo Base System version 1.12.4 Portage 2.1-r2 (hardened/x86/2.6, gcc-hardenednopie, glibc-2.3.6-r4, 2.6.17 i686) ================================================================= System uname: 2.6.17 i686 AMD Athlon(tm) XP 2800+ app-admin/eselect-compiler: [Not Present] dev-lang/python: 2.4.3-r1 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: [Not Present] dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.3.13-r3 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-march=athlon-xp -Os -pipe -fomit-frame-pointer" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/lib/X11/xkb /usr/share/config" CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/revdep-rebuild /etc/terminfo" CXXFLAGS="-march=athlon-xp -O2 -pipe -fomit-frame-pointer" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks metadata-transfer notitles sandbox sfperms strict test userfetch userpriv usersandbox" LANG="en_GB.utf8" LINGUAS="en eo es nl" MAKEOPTS="-j1" PKGDIR="/usr/portage//packages/x86/" PORTAGE_RSYNC_EXTRA_OPTS="--progress --human-readable --exclude-from=/etc/portage/rsync_excludes" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage/" PORTDIR_OVERLAY="/usr/local/portage" USE="3dnow X aac alsa apm arts asf audiofile avi bash-completion berkdb bzip2 cdparanoia cdr crypt dga dio dlloader dri dv encode exif fam fbcon ffmpeg flac gif glx gpm gtk gtk2 gtkhtml hardened imagemagick imap imlib jabber jpeg jpeg2k kde kdeenablefinal lcms lm_sensors mad mbox mbrola memlimit mikmod mime mmap mmx mng mp3 mpeg musepack nas ncurses nls nptl nsplugin ogg opengl oscar pdf pic png python qt3 quicktime readline recode sasl scanner sdl shorten sndfile sox speex spell sqlite sse ssl svg test theora threads tidy tiff truetype unicode usb userlocales vcd vorbis win32codecs wmf x86 xface xine xml xorg xpm xsl xv xvid zlib elibc_glibc input_devices_mouse input_devices_keyboard kernel_linux linguas_en linguas_eo linguas_es linguas_nl userland_GNU video_cards_via video_cards_vesa video_cards_fbdev" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, LDFLAGS
Due to SSP having issues with C++ code, I just placed a -fno-stack-protector in the x11-libs/qt ebuilds. Thus, you should no longer see those issues when emerging anything qt-based or QT itself.
