Bug 73921 – Kstars freezes when right-clicking

• Status: RESOLVED INVALID
• Product: Gentoo Linux

[Description Janne Ojaniemi 2004-12-09 09:41:09 UTC]

When I right-click inside the starfield in Kstars, the application immediately freezes. Only way to kill it is to do so manually. While it's frozen, it consumes 90+% of CPU-cycles. Sometimes the contex-menu does appear few times, but after few times (at most, 90% of the time it freezes immediately) the app freezes.

This error appeared both in KDE 3.3.1 and 3.3.2. I'm not sure about 3.3.0. KDE is compiled with these CFLAGS:CFLAGS="-O2 -march=athlon64 -frename-registers -ffast-math -pipe", although I'm not sure that does KDE override the default CFLAGS. GCC is version 3.4.3. This is a 64bit AMD64-system.

Reproducible: Always
Steps to Reproduce:
1. Right-click inside the starfield in Kstars
2.
3.

Actual Results:  
The application freezes 

Expected Results:  
A context-menu should appear 

gothmog janne # emerge info 
Portage 2.0.51-r8 (default-linux/amd64/2004.3, gcc-3.4.3, 
glibc-2.3.4.20041102-r0, 2.6.10-rc3 x86_64) 
================================================================= 
System uname: 2.6.10-rc3 x86_64 AMD Athlon(tm) 64 Processor 3200+ 
Gentoo Base System version 1.6.7 
Python:              dev-lang/python-2.3.4 [2.3.4 (#1, Oct  2 2004, 20:18:41)] 
dev-lang/python:     2.3.4 
sys-devel/autoconf:  2.59-r6, 2.13 
sys-devel/automake:  1.8.5-r2, 1.5, 1.4_p6, 1.6.3, 1.7.9, 1.9.3 
sys-devel/binutils:  2.15.92.0.2-r1 
sys-devel/libtool:   1.5.2-r7 
virtual/os-headers:  2.6.8.1-r1 
ACCEPT_KEYWORDS="amd64 ~amd64" 
AUTOCLEAN="yes" 
CFLAGS="-O2 -march=athlon64 -frename-registers -ffast-math -pipe" 
CHOST="x86_64-pc-linux-gnu" 
CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/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/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=athlon64 -frename-registers -ffast-math -pipe" 
DISTDIR="/usr/portage/distfiles" 
FEATURES="autoaddcvs autoconfig ccache distlocks sandbox" 
GENTOO_MIRRORS="http://distfiles.gentoo.org 
http://distro.ibiblio.org/pub/Linux/distributions/gentoo" 
MAKEOPTS="-j2" 
PKGDIR="/usr/portage/packages" 
PORTAGE_TMPDIR="/var/tmp" 
PORTDIR="/usr/portage" 
PORTDIR_OVERLAY="" 
SYNC="rsync://rsync.gentoo.org/gentoo-portage" 
USE="X acpi alsa amd64 arts avi berkdb bitmap-fonts cdr crypt dvd dvdr 
encode esd f77 fam fbcon flac fortran gdbm gif gphoto gpm gstreamer 
imagemagick imlib ipv6 java jp2 jpeg junit kde libwww lzw lzw-tiff mad 
mikmod motif mozilla mpeg multilib ncurses nls nptl oggvorbis opengl oss 
pam perl png python qt quicktime readline sdl slang spell ssl tcpd tetex 
theora tiff truetype usb userlocales xine xml2 xmms xpm xrandr xv xvid zlib"

[Comment 1 Carsten Lohrke (RETIRED) 2004-12-09 10:13:56 UTC]

-ffast-math
    Sets -fno-math-errno, -funsafe-math-optimizations,
    -fno-trapping-math, -ffinite-math-only, -fno-rounding-math and -fno-signaling-nans.

    This option causes the preprocessor macro __FAST_MATH__ to be defined.

    This option should never be turned on by any -O option since it can result in incorrect output for programs which depend on an exact implementation of IEEE or ISO rules/specifications for math functions.

[Comment 2 Janne Ojaniemi 2004-12-09 10:31:33 UTC]

I'm aware that -ffast-math can be somewhat risky, but I haven't had any problems with any other apps. And Kstars DID work back in KDE3.2-days, and my CFLAGS were identical back then.

[Comment 3 Carsten Lohrke (RETIRED) 2004-12-09 11:01:12 UTC]

While you can do a lot, -ffast-math is enough to close the bug report as WONTFIX. 
Please recompile KDE without this flag and tell us, if you still have the same problem.

[Comment 4 Janne Ojaniemi 2004-12-09 11:07:06 UTC]

Well crap. Recompiling KDE and other relevant packages would take quite alot of time. I need to look in to that.

[Comment 5 Caleb Tennis (RETIRED) 2004-12-09 12:41:34 UTC]

You can try just recompiling kdeedu (I think that's where kstars comes from) and see if that doesn't fix that problem.

[Comment 6 NecLimDul 2004-12-09 21:45:24 UTC]

I just ran it and i dont have a problem.  i also have --ffast-math in my use and there is no problem.  and --ffast-math as i understand it isn't *that* risky unless you'd be running programs compiled with and without ffast-math

[Comment 7 Janne Ojaniemi 2004-12-10 11:35:10 UTC]

#6: are you running a 64bit system?

[Comment 8 Gregorio Guidi (RETIRED) 2005-01-02 09:47:03 UTC]

... until package is recompiled as requested.

[Comment 9 Janne Ojaniemi 2005-01-03 08:59:25 UTC]

As it happens, I recompiled kdeedu without fast-math just yesterday, and Kstars seems to be working now.