Bugzilla Bug 92011

After successfully emerging qemacs 0.3.1 (and the masked 0.3.1-r2 too) under
amd64, when trying to start qemacs a segmentation fault is reported and the
application is not started.

Reproducible: Always
Steps to Reproduce:
1. type qemacs

Actual Results:  
segmentation fault


Expected Results:  
successful start of app

Gentoo Base System version 1.4.16
Portage 2.0.51.19 (default-linux/amd64/2004.3, gcc-3.4.3, glibc-2.3.4.20041102-
r1, 2.6.9-gentoo-r14 x86_64)
=================================================================
System uname: 2.6.9-gentoo-r14 x86_64 AMD Athlon(tm) 64 Processor 2800+
Python:              dev-lang/python-2.3.4-r1 [2.3.4 (#1, Mar  4 2005, 11:11:44
)]
distcc 2.18.3 x86_64-pc-linux-gnu (protocols 1 and 2) (default port 3632) 
[disabled]
dev-lang/python:     2.3.4-r1
sys-apps/sandbox:    [Not Present]
sys-devel/autoconf:  2.13, 2.59-r6
sys-devel/automake:  1.9.5, 1.5, 1.8.5-r3, 1.6.3, 1.7.9-r1, 1.4_p6
sys-devel/binutils:  2.15.92.0.2-r8
sys-devel/libtool:   1.5.16
virtual/os-headers:  2.6.8.1-r4
ACCEPT_KEYWORDS="amd64"
AUTOCLEAN="yes"
CFLAGS="-O2"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config /usr/lib/
X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-O2"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoaddcvs autoconfig ccache distlocks sandbox strict"
GENTOO_MIRRORS="http://pandemonium.tiscali.de/pub/gentoo/ ftp://pandemonium.
tiscali.de/pub/gentoo/ http://gd.tuwien.ac.at/opsys/linux/gentoo/"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="amd64 X acpi alsa avi berkdb bitmap-fonts calendar cdr crypt cups curl dvd 
eds emacs esd fam font-server fortran gdbm gif gnome gpg gpm gstreamer gtk gtk2 
hbci imlib ipv6 java jp2 jpeg lzw lzw-tiff motif mozilla mp3 mpeg mule mysql 
ncurses nls ogg oggvorbis opengl oss pam pdflib perl png python qt quicktime 
readline samba slang ssl tcpd tiff truetype truetype-fonts type1-fonts unicode 
usb userlocales vorbis xemacs xml2 xmms xpm xrandr xv zlib userland_GNU 
kernel_linux elibc_glibc"
Unset:  ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS

can you please provide a gdb backtrace? it works fine for me. simply set
FEATURES="nostrip" , edit your make.conf and set CFLAGS="-O0 -ggdb" and emerge
qemacs again. so start it, run 'gdb qemacs' and then type run, when the program
segfaults type 'bt full' , that generates the backtrace.

quite interesting, with -O0 it works. segfaults also for me with -O2. now where
i can reproduce i can generate the backtrace on my own, so nevermind ;)

is this still an issue with never versions of gcc and qemacs?

(In reply to comment #3)
> is this still an issue with never versions of gcc and qemacs?

with current cvs (as of Aug  5 18:55:01 CEST 2005) it starts up allright and
seems to work allright, although i haven't tested it very thoroughly. this was
tested with sys-devel/gcc-3.4.3-r1

closing per comment 4

I'd like to reopen this.  On my x86 boxes it still segfaults.  I'm using
gcc-3.4
with CFLAGS="-march=i686 -O3 -pipe -fomit-frame-pointer"

I can attach a backtrace like in comment #1 later.

Emerge info:
Portage 2.0.53_rc7 (default-linux/x86/2005.0, gcc-3.4.4, glibc-2.3.5-r3,
2.6.14.2 i686)
=================================================================
System uname: 2.6.14.2 i686 Intel(R) Celeron(TM) CPU                1066MHz
Gentoo Base System version 1.12.0_pre11
distcc 2.18.3 i686-pc-linux-gnu (protocols 1 and 2) (default port 3632)
[enabled]
dev-lang/python:     2.3.5, 2.4.2
sys-apps/sandbox:    1.2.13
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-r1
sys-devel/binutils:  2.16.1
sys-devel/libtool:   1.5.20-r1
virtual/os-headers:  2.6.11-r3
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-march=i686 -O3 -pipe -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/3.4/env
/usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3/share/config
/usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config
/var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/texmf/web2c /etc/env.d"
CXXFLAGS="-march=i686 -O3 -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig collision-protection distcc distlocks sandbox sfperms
strict userpriv usersandbox"
GENTOO_MIRRORS="http://distro.ibiblio.org/pub/linux/distributions/gentoo/ "
MAKEOPTS="-j8"
PKGDIR="/mnt/aconite-gentoo-packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage /usr/local/ag-portage"
SYNC="rsync://aconite/gentoo-portage"
USE="x86 X Xaw3d a52 aac aalib acpi alsa apm arts audiofile avi berkdb
bitmap-fonts bzip2 cairo cdr cjk crypt cups curl dbus dga dts dv dvb dvd dvdr
eds emacs emboss encode esd ethereal exif expat f77 faad fam fbcon ffmpeg fftw
flac fortran gcj gd gdbm gif gimpprint ginac glut gmp gnome gnustep gnutls
gphoto2 gpm gstreamer gtk gtk2 gtkhtml guile hal idn imagemagick imlib jack
java
jpeg lcms ldap leim libcaca libg++ libwww lirc live lua mad matroska mikmod mmx
mng mono motif mozilla mp3 mpeg mysql nas ncurses nls nptl objc offensive ogg
oggvorbis openal opengl oss pam pcmcia pcre pdflib perl plotutils png ppds
python qhull qt quicktime radeon readline recode rtc samba scanner sdk sdl
slang
speex spell sqlite sse ssl svg tcltk tcpd tetex theora threads tiff truetype
truetype-fonts type1-fonts udev unicode usb v4l v4l2 vcd vorbis wmf wxwindows
xine xinerama xml xml2 xmms xosd xprint xv xvid zlib video_cards_mach64
video_cards_i810 video_cards_i830 video_cards_i915 video_cards_radeon
userland_GNU kernel_linux elibc_glibc"
Unset:  ASFLAGS, CTARGET, LANG, LC_ALL, LDFLAGS, LINGUAS

reopening per user request

Created an attachment (id=75097) [details]
strace output for qe call

I have this same segfault on my X86 machine,
with gcc-3.4.4 and CFLAGS="-O3 -march=pentium3m -fomit-frame-pointer".

as the strace output is missing so far, i attached mine.
if anything else should be needed just complain --
i don't want to overflow this thread with another 
emerge info.

mkennedy@localhost:/tmp/qemacs-0.3.1$ gdb qe
GNU gdb 6.4
Copyright 2005 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".

(gdb) r
Starting program: /tmp/qemacs-0.3.1/qe 

Program received signal SIGSEGV, Segmentation fault.
0xb7ea7463 in _IO_2_1_stderr_ () from /lib/libc.so.6
(gdb) where
#0  0xb7ea7463 in _IO_2_1_stderr_ () from /lib/libc.so.6
#1  0x080597a2 in qe_init (opaque=0x0) at qe.c:6194
#2  0x0805effa in url_main_loop (init=0x80593c0 <qe_init>, opaque=0x0) at
unix.c:291
#3  0x08059abb in main (argc=0, argv=0x0) at qe.c:6432
(gdb) 

I think this is a CFLAGS problem.  I can build a functioning qemacs if I unset
CFLAGS.

my CFLAGS are "-march=athlon-xp -O2 -fomit-frame-pointer -pipe", The only
variable seems to be the optimization level.  With -O0, -O1 it doesnt segfault,
with -Os, -O2 and -O3 it segfaults.  The code seems to be sane enough anyway.

Portage 2.1_pre10-r5 (default-linux/x86/2006.0, gcc-3.4.6, glibc-2.4-r2,
2.6.15-gentoo-r8 i686)
=================================================================
System uname: 2.6.15-gentoo-r8 i686 AMD Athlon(tm) XP 3200+
Gentoo Base System version 1.12.0_pre19
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-r2
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r5
ACCEPT_KEYWORDS="x86 ~x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config
/usr/share/X11/xkb /usr/share/config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/eselect/compiler /etc/gconf /etc/revdep-rebuild
/etc/terminfo /etc/texmf/web2c /etc/env.d"
CXXFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoaddcvs autoconfig cvs distlocks metadata-transfer notitles
sandbox sfperms sign strict userpriv usersandbox"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
PKGDIR="/usr/portage/packages"
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="/home/mkennedy/overlay"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="x86 3dnow X a52 aac acl alsa apache2 apm avi berkdb bitmap-fonts cli crypt
dts dv dvd dvdr eds emacs emboss encode ffmpeg flac foomaticdb fortran gdbm gif
gstreamer gtk2 hal ieee1394 isdnlog jikes jpeg libg++ libwww mad mikmod mmx
mozilla mp3 mpeg ncurses nls nptl nptlonly nsplugin ogg opengl pam pcre pdflib
png pppd quicktime reflection sdl session source speex spell spl sse ssl tcpd
theora threads tiff truetype truetype-fonts type1-fonts udev unicode vcd vorbis
x264 xml xorg xprint xv xvid yv12 zlib elibc_glibc input_devices_keyboard
input_devices_mouse kernel_linux userland_GNU video_cards_nv
video_cards_nvidia"
Unset:  ASFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL,
LDFLAGS, LINGUAS, MAKEOPTS, PORTAGE_RSYNC_EXTRA_OPTS

mkennedy@localhost:/tmp/qemacs-0.3.1$ 

Maybe filter CFLAGS?

Even after applying patches for the new libpng and for GCC 4.1 it segfaults
here (for patches see dependencies of bug #141567).

Traceback:

Program received signal SIGSEGV, Segmentation fault.
0x46757462 in _IO_2_1_stderr_ () from /lib/libc.so.6
(gdb) bt
#0  0x46757462 in _IO_2_1_stderr_ () from /lib/libc.so.6
#1  0x08056f70 in qe_init ()
#2  0x0805e5f4 in url_main_loop ()
#3  0x0805000f in main ()

This has been fixed in -r3, please close.

Thanks.

It misses inherit flag-o-matic so it does not replace any flag.
It should also remove the default O2 CFLAGS in configure

Thanks

(In reply to comment #16)
> It misses inherit flag-o-matic so it does not replace any flag.

 Fixed. Thanks for pointing out

> It should also remove the default O2 CFLAGS in configure

 CFLAGS is only set to -O2 when CFLAGS is empty.  Another setting is for BeOS
only.