Am 04.02.2011 23:26, schrieb Grant:
> Yesterday I caught up with portage and updated quite a few packages on
> a remote workstation.  The system hadn't been updated for about a
> month.  The updates included some xorg stuff and some xfce4 stuff.
> Today when the workstation's user logged in via gdm, she clicked the
> xfce4 "Migrate Config" option, something weird happened, and she ended
> up back on the gdm welcome screen.  Now whenever she logs is via gdm,
> the screen immediately goes black and she is routed back to the gdm
> welcome screen again.  When I have grsecurity enabled I get this in
> dmesg:
> 
> Segmentation fault occurred at 000068e453633fdc in
> /usr/bin/Xorg[X:4777] uid/euid:0/0 gid/egid:0/0, parent
> /usr/sbin/gdm-binary[gdm:4775] uid/euid:0/0 gid/egid:1010/1002
> 
> She also tried skipping gdm and issuing startxfce4 manually but it
> fails in a similar way and displays "disconnected from session
> manager".  I get this in Xorg.0.log:
> 
> Backtrace:
> [    74.799] 0: /usr/bin/X (xorg_backtrace+0x28) [0x49eeb8]
> [    74.799] 1: /usr/bin/X (0x400000+0x62849) [0x462849]
> [    74.799] 2: /lib/libpthread.so.0 (0x64727eac2000+0xf3f0) [0x64727ead13f0]
> [    74.800] 3: /usr/lib64/xorg/modules/drivers/nv_drv.so
> (0x64727bed7000+0x112d0) [0x64727bee82d0]
> [    74.800] 4: /usr/lib64/xorg/modules/libshadowfb.so
> (0x64727a682000+0x3db2) [0x64727a685db2]
> [    74.800] 5: /usr/bin/X (0x400000+0x2da29) [0x42da29]
> [    74.800] 6: /usr/bin/X (0x400000+0x2eda9) [0x42eda9]
> [    74.800] 7: /usr/bin/X (0x400000+0x2475a) [0x42475a]
> [    74.800] 8: /lib/libc.so.6 (__libc_start_main+0xe6) [0x64727dcb2ba6]
> [    74.800] 9: /usr/bin/X (0x400000+0x242f9) [0x4242f9]
> [    74.800] Segmentation fault at address 0x64727462bfdc
> [    74.800]
> Fatal server error:
> [    74.800] Caught signal 11 (Segmentation fault). Server aborting
> 
> and when grsecurity is enabled I get this in dmesg:
> 
> Segmentation fault occurred at 000064727462bfdc in
> /usr/bin/Xorg[X:4647] uid/euid:1003/0 gid/egid:1010/1010, parent
> /usr/bin/xinit[xinit:4646] uid/euid:1003/1003 gid/egid:1010/1010
> 
> I have tried disabling all security options in the kernel but I get
> the same results with the exception of the dmesg info.  I tried
> re-emerging xorg-server, xf86-video-nv, xinit, and gdm.  Strangely,
> after re-emerging xorg-server and xinit there were files to change in
> etc-update.  I don't see how that's possible since I'm caught up with
> emerge -DuN world.  revdep-rebuild comes up with nothing.  I'm running
> an emerge -e world now.  It's weird that the gdm welcome screen will
> load (which implies xorg) but nothing afterward.  Any ideas?
> 
> - Grant
> 

Please try to run
`strace startx`
and post the output as a file attachment.