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During an emerge -e world, my system starts misbehaving at some point. After a
few restarts, I'm quite confident that it is during the merge phase of gcc that
things  go wrong.
Symptoms are:
- windowmanager (blackbox) crashes
- kde apps (konqueror) segfault
- xorg terminates
Also, I've seen portage abort the gcc merge with "Segmentation fault" 
The system runs stable for >2 days (too noisy -> shut down at night).
This problem has appeared about 3 weeks ago and has since then been pretty
consistent.

Reproducible: Always
Steps to Reproduce:
1.emerge -e world
2.
3.



Expected Results:  
The emerge should have proceeded

Portage 2.0.51.19 (default-linux/x86/2004.3, gcc-3.4.3-20050110,
glibc-2.3.4.20050125-r0, 2.6.10 i686)
=================================================================
System uname: 2.6.10 i686 AMD Athlon(tm) XP 2600+
Gentoo Base System version 1.6.9
Python:              dev-lang/python-2.3.5 [2.3.5 (#1, Mar  9 2005, 16:44:00)]
ccache version 2.3 [enabled]
dev-lang/python:     2.3.5
sys-devel/autoconf:  2.59-r6, 2.13
sys-devel/automake:  1.7.9-r1, 1.8.5-r3, 1.5, 1.4_p6, 1.6.3, 1.9.5
sys-devel/binutils:  2.15.92.0.2-r5
sys-devel/libtool:   1.5.10-r5
virtual/os-headers:  2.6.8.1-r2
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.3/env
/usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config
/usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config
/usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/
/usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/
/usr/share/texmf/xdvi/ /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoaddcvs autoconfig buildpkg ccache distlocks sandbox sfperms"
GENTOO_MIRRORS="http://pandemonium.tiscali.de/pub/gentoo/"
LDFLAGS="-Wl,-O1"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="x86 3dnow 3dnowex X a52 aac aalib acpi alsa apache2 apm arts avi
bash-completion berkdb bidi bigger-fonts bitmap-fonts bootsplash ccache cdda
cddb cdparanoia cdr chroot codecs crypt cups curl dga dv dvd dvdr dvdread ecc
emboss encode esd faad fam fbcon ffmpeg fftw font-server foomaticdb fortran gd
gd-external gdbm gif glep gmp gpm imagemagick imlib ipv6 jabber jack jikes jit
jpeg jpeg2k kde kdeenablefinal ladcca libg++ libwww lm_sensors lzo lzw-tiff mad
matroska mhash mikmod mime mjpeg mmx mmx2 mng monkey motif mozilla mozsvg mp3
mpeg mpeg4 ncurses nls nptl nvidia ogg oggvorbis openal opengl oss pam
parse-clocks pdf pdflib perl physfs png python qt quicktime readline real
recode
ruby samba sdl spell sse sse2 ssl svga tcpd threads tiff transcode truetype
truetype-fonts type1-fonts utf8 xml2 xv zlib"
Unset:  ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, PORTDIR_OVERLAY

you need to provide more information, like the crash messages from GCC,
tracebacks from kde/xorg/blackbox.

But I'd venture your hardware isn't up to scratch.

It's not the hardware. I've been compiling for ~8h now without any problems.
If I understand it correctly the weirdness happens during the gcc merge phase. Providing any tracebacks etc. is quite difficult since most running programs terminate ...
I've seen blackbox quit with "signal 11", not much info on the other apps.
It's one of those strangebugs that are hard to track down, but it is really annoying and might other users in the future.

compile your glibc and crashing apps with 
FEATURES="nostrip" CFLAGS="-ggdb3 -O2 -march=athlon-xp", 
then enable core dumps (ulimit -c ......)

Once you get a core dump file, use 'gdb binary corefile'
and use the 'bt' command in gdb to generate the trackback.

Quick me,too here, so that Patrick doesn't feel alone. :) I'm doing the same
emerge -e, but I have no X running on this host. Symptoms are: 61 packages
emerged without problems, then comes gcc-config-1.3.10-r1, big badaboom.
Segmentation fault. Same result with gcc-3.4.3-20050110, everything (!) else
compiles without any problems whatsoever.

Tell me what you need in terms of info from me. Here's an emerge info for
starters:

Portage 2.0.51.19 (default-linux/x86/2004.0, gcc-3.4.3-20050110,
glibc-2.3.4.20050125-r0, 2.6.11-gentoo-r1 i686)
=================================================================
System uname: 2.6.11-gentoo-r1 i686 AMD Athlon(tm) Processor
Gentoo Base System version 1.6.9
Python:              dev-lang/python-2.2.3-r5,dev-lang/python-2.3.5 [2.3.5 (#1,
Mar 10 2005, 02:06:20)]
distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632)
[enabled]
dev-lang/python:     2.2.3-r5, 2.3.5
sys-devel/autoconf:  2.59-r6, 2.13
sys-devel/automake:  1.7.9-r1, 1.8.5-r3, 1.5, 1.4_p6, 1.6.3, 1.9.5
sys-devel/binutils:  2.15.92.0.2-r5
sys-devel/libtool:   1.5.10-r5
virtual/os-headers:  2.4.19-r1, 2.4.22-r1
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CFLAGS="-march=athlon -O3 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.1/share/config
/usr/kde/3.2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config
/usr/kde/3.3/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb
/usr/share/config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-march=athlon -O3 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoaddcvs autoconfig ccache distcc sandbox sfperms userpriv"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/Linux/distributions/gentoo"
MAKEOPTS="-j7"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.de.gentoo.org/gentoo-portage"
USE="x86 X apm arts avi berkdb bitmap-fonts canna cdr crypt cups curl dvd
emboss encode esd fam fbcon flac font-server foomaticdb fortran freewnn gdbm
gif gpm gtk gtk2 imlib immqt-bc ipv6 java jpeg kde libg++ libwww mad mikmod
motif mozaccess-builtin mozctl mozilla mp3 mpeg ncurses nls nocardbus oggvorbis
opengl oss pam pdflib perl png python qt quicktime readline scanner sdl slang
spell ssl svga tcltk tcpd tiff truetype truetype-fonts type1-fonts userlocales
xml2 xmms xv zlib"
Unset:  ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, LDFLAGS, PORTDIR_OVERLAY

Building in a chroot doesn't trigger it. Really interesting ...

quick request, but flip off the sandbox during these tests please (eradicator
has reported some crazyness with sandbox and some gcc-config stuff he's hacking
on).

FEATURES="-sandbox" doesn't help, I still get the segfault right after ">>>
Regenerating /etc/ld.so.cache"

when you get the segfault, there should be a core file somewhere as I noted.

it won't create a core file unless you set a new core file size limit (default
is    0 = no core file) with ulimit -c (unit is 1024Bytes, better choose a
large value, e.g. 32MB = 32768)

the error message will change to "Segmentation fault (core dumped)"

Besides the fact that I've been out of town since my last comment, had to
emerge gdb to begin with, and am currently watching glibc compile with the
flags Robin suggested, I'm having a bit of a chicken-and-egg problem here: I
get the segfaults exclusively from `emerge gcc` and `emerge gcc-config`, so
what's the "crashing application" I should debug in those cases? If what
Patrick said is true, that's probably gcc, but since the segmentation fault
occurs everytime I emerge just that, I'll have difficulties building it with
nostrip and -ggdb3... You need those to make sense of the core file, right?

Build gcc and glibc with the required use flags on another machine that works,
or get somebody else to (I've got cpu power if you need it).

just noticed this bug.

Hey same thing here. host system is amd64 non multilib.

+ gcc-config x86_64-pc-linux-gnu-3.4.3
 * Switching to x86_64-pc-linux-gnu-3.4.3 compiler...                                                                                                 [ ok ]+ rm -f //usr/sbin/gcc-config
+ set +x
>>> Regenerating /etc/ld.so.cache...
>>> sys-devel/gcc-config-1.3.10-r1 merged.
Segmentation fault (core dumped)


python compiled with all the good stuff, but still yeilds no human readable backtrace.

The core does show the segfault is caused by 
'/usr/bin/python2.3 -O /usr/bin/emerge gcc-config' 
and it only happens in the qmerge phase. running from command line is fine.
(python@ || portage@) bug is my guess and not toolchain@

I'll continue to debug today to see what I can learn about this as it's a blocker for hardned doing any amd64 stages

It's a toolchain bug.
This fixes it.

--- gcc-config-1.3.10.orig      2005-03-19 20:27:01.223207288 +0000
+++ gcc-config-1.3.10   2005-03-19 20:27:32.493453488 +0000
@@ -229,7 +229,7 @@
        # On many systems (x86/amd64/etc...), this will probably never matter, 
        # but on other systems (arm/mips/etc...), this is quite critical.
        # http://bugs.gentoo.org/show_bug.cgi?id=60190
-       if ! is_cross_compiler ; then
+       if ! is_cross_compiler && [[ $PORTAGE_CALLER != "emerge" ]] ; then
                for multilib in $(${ROOT}/${GCC_BIN_PATH}/gcc -print-multi-lib); do
                        multiarg=${multilib#*;}
                        multiarg=${multiarg/@/-}

Confirmed, changing that line in
/usr/portage/sys-devel/gcc-config/files/gcc-config-1.3.10 makes the segfault go
away. Thanks a lot, solar!

patrick: can you confirm ?

gcc-config seems to work
emerge gcc 3.4.3-20050110-r1 fails

will apply patch and test.

patch works.

Awaiting new gcc-config release ;-)

already been fixed in portage