Xorg - exited on signal 6 (core dumped)

[Atom Smasher]

FreeBSD 6.1-RELEASE
xorg-server-6.9.0_6
xorg-clients-6.9.0_3
nvidia-driver-1.0.9746

these are the latest ports for freeBSD.

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# egrep -v ^# /etc/xdm/Xservers

:0 local /usr/X11R6/bin/Xorg :0 -nolisten tcp vt9
:1 local /usr/X11R6/bin/Xorg :1 -nolisten tcp vt10

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the session that i'm *not* currently logged into regularly dies like this:
   Feb 24 08:46:14 willy kernel: pid 601 (Xorg), uid 0: exited on signal 6 (core dumped)
   Feb 24 16:13:50 willy kernel: pid 586 (Xorg), uid 0: exited on signal 6 (core dumped)

most (all?) of the time when one session (that i'm not currently using) 
crashes, the other session (that i am using) will immediately look weird, 
sort of like pixelated reverse video. i can then <CTRL><ALT><Fx> to the 
other virtual terminal, see xdm's login, then <CTRL><ALT><Fy> back to the 
session that i'm currently using and everything looks fine.

i recompiled xorg-server-6.9.0_6 "WITH_DEBUG", but gdb still gives me a 
bunch of gibberish when i try to analyze Xorg.core.

/var/log/Xorg.*.log gives me no useful information.

~/.xsession-errors only tells me that the connection to the server was 
lost...

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X connection to :1.0 broken (explicit kill or server shutdown).
X connection to :1.0 broken (explicit kill or server shutdown).
The application 'gnome-settings-daemon' lost its connection to the display :1.0;
most likely the X server was shut down or you killed/destroyed the application.
The application '<unknown>' lost its connection to the display :1.0;
most likely the X server was shut down or you killed/destroyed the application.

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any suggestions? any other config files or settings of interest?

thanks...


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         ...atom

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