abrt version: 2.0.1
executable: /usr/libexec/gnome-settings-daemon
cmdline: /usr/libexec/gnome-settings-daemon
component: gnome-settings-daemon
crash_function: set_motion
kernel: 2.6.38.5-22.fc15.i686.PAE
architecture: i686
reason: Process /usr/libexec/gnome-settings-daemon was killed by signal 11 (SIGSEGV)
package: gnome-settings-daemon-3.0.1-4.fc15
username: vj
uid: 500
rating: 4
time: 1304484006
os_release: Fedora release 15 (Lovelock)

Text file: event_log, 20473 bytes
Text file: build_ids, 5781 bytes
Binary file: coredump, 37322752 bytes
Text file: dsos, 27496 bytes
Text file: maps, 29375 bytes
Text file: backtrace, 27085 bytes

comment
-----
This crash happens always after logging out of Gnome 3 once and trying to log back in. Subsequent login attempts are unsuccessful and end up in an "Oops"-dialog with only a chance to "Log out".

STEPS TO REPRODUCE:
1. Log out of Gnome 3
2. Try to log back in

Here are the messages in var/log/messages:
May  4 08:01:26 straylight kernel: [ 1458.662371] gnome-settings-[3823]: segfault at 0 ip 0062a181 sp bfb785d0 error 4 in libmouse.so[626000+c000]
May  4 08:01:27 straylight abrt[3857]: saved core dump of pid 3823 (/usr/libexec/gnome-settings-daemon) to /var/spool/abrt/ccpp-2011-05-04-08:01:26-3823.new/coredump (37326848 bytes)
May  4 08:01:27 straylight abrtd: Directory 'ccpp-2011-05-04-08:01:26-3823' creation detected
May  4 08:01:27 straylight gnome-session[3682]: WARNING: Application 'gnome-settings-daemon.desktop' killed by signal
May  4 08:01:27 straylight abrtd: Dump directory is a duplicate of /var/spool/abrt/ccpp-2011-05-04-07:40:06-1630
May  4 08:01:27 straylight abrtd: Deleting dump directory ccpp-2011-05-04-08:01:26-3823 (dup of ccpp-2011-05-04-07:40:06-1630), sending dbus signal
May  4 08:01:28 straylight kernel: [ 1460.041406] gnome-settings-[3908]: segfault at 0 ip 001a2181 sp bfda3230 error 4 in libmouse.so[19e000+c000]
May  4 08:01:28 straylight abrt[3960]: not dumping repeating crash in '/usr/libexec/gnome-settings-daemon'
May  4 08:01:28 straylight gnome-session[3682]: WARNING: App 'gnome-settings-daemon.desktop' respawning too quickly
May  4 08:01:28 straylight gnome-session[3682]: WARNING: Application 'gnome-settings-daemon.desktop' killed by signal

The libmouse.so -part looked interesting, so I tried removing the usb dongle (I have a wireless Logitech Mouse Anywhere MX) and putting it back in. That worked around the problem and I was able to log in again.

environ
-----
XDG_SESSION_ID=1
HOSTNAME=straylight.local
IMSETTINGS_INTEGRATE_DESKTOP=yes
SHELL=/bin/bash
TERM=dumb
HISTSIZE=1000
XDG_SESSION_COOKIE=8f00da5ccd48ddda5bf18c0a00000027-1304484004.120137-569693384
GNOME_KEYRING_CONTROL=/tmp/keyring-yhg84d
IMSETTINGS_MODULE=none
USER=vj
USERNAME=vj
MAIL=/var/spool/mail/vj
PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/vj/bin
DESKTOP_SESSION=gnome
QT_IM_MODULE=xim
PWD=/home/vj
XMODIFIERS=@im=none
GNOME_KEYRING_PID=1475
LANG=en_US.UTF-8
GDM_LANG=
GDMSESSION=gnome
HISTCONTROL=ignoredups
HOME=/home/vj
SHLVL=1
LOGNAME=vj
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-gIUa7OEazx,guid=bb662435bf4ef0aca6db162e000000b0
'LESSOPEN=||/usr/bin/lesspipe.sh %s'
WINDOWPATH=1
XDG_RUNTIME_DIR=/run/user/vj
DISPLAY=:0
GTK_IM_MODULE=gtk-im-context-simple
G_BROKEN_FILENAMES=1
XAUTHORITY=/var/run/gdm/auth-for-vj-zqB2BH/database
_=/usr/bin/gnome-session
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/1483,unix/unix:/tmp/.ICE-unix/1483
ORBIT_SOCKETDIR=/tmp/orbit-vj
DESKTOP_AUTOSTART_ID=1024e172296edca26113044840057124100000014830001