Re: [gentoo-user] Xorg segfaults, but GDM welcome screen loads

[Florian Philipp <lists@binarywings.net>]

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Am 05.02.2011 17:59, 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:
>>>
[...]

>>>
>>> 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.
> 
> Another question, is there anything I need to prepare to make sure the
> strace works?
> 
> - Grant
> 

Um, emerge it?

By the way: I recently had a similar freak problem with X11 on a KDE
machine. It turned out the system tried to start the default session
with twm and xterm (default when no window environment is installed) and
crashed because xterm was no longer present.

I don't think this is your problem but maybe it gets you closer to a
solution if you try to get such a light-weight solution running instead
of the full-blown xfce.

Did you also try to remove your xorg.conf, if you have any?

Hope this helps,
Florian Philipp


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