[Pkg-xfce-devel] Bug#564694: Bug#564694: xfdesktop4: Crash when moving desktop icons on secondary screen

Yves-Alexis Perez corsac at debian.org
Mon Jan 11 16:30:35 UTC 2010

S. Raase a écrit :
> Hello,
>> please let 564694 at bugs.debian.org on CC:
> OK, I'll try.
>>> I did not test with vesa or nv, because vesa does not allow DualHead and
>>> nv uses the xrandr-Extension for DualHead modes. In both cases there is
>>> no second X screen (:0.1) and it would not apply there.
>> Yeah but there's a 99% chance the bug is caused by a binary blob there's
>> no way to debug. Anyway DualHead doesn't look at something supported,
>> wether by X server or clients, if it's a proprietary nvidia stuff.
> nv on my system does not allow DualHead at all, neither does vesa and
> the problem does not apply on screen :0.0 or :1.0, but it does on screen
> :0.1 and :1.1. (I did not try nouveau, last time it just core dumped.)

You already said that. Basically we can't debug anything in nvidia
driver so we're stuck.
> The problem did exist with nvidia driver version 185.18.36 and it does
> with 190.53 as well.

> I strongly suspect the nvidia driver of not causing the crash, but
> instead a mis-handling if xfce4 is been used on multiple x-screens.
> Can't test this theory though, because I don't know how to create
> different screens with another driver.

And I strongly suspect the nvidia driver causing the crash.
> For your information, I do not use the TwinView feature for DualHead of
> the nvidia driver (which essentially implements some Xinerama), but
> instead the basic way of X11 using one server and one x-screen per real
> screen. These screens are completely separate.

Then I fail to see how it can't be reproducible with another driver.
> Anyway, I am running Debian/testing as of today, 2010-01-11. The crash
> has been there for at least a few days, although I have no idea when it
> appeared.

What was updated during that few days? (not xfdesktop4, that's for sure)
> I'll attach my xorg.conf, as well as Xorg.0.log to this mail.
>>> I don't know how to get a backtrace, do you have some howto?
>> http://wiki.debian.org/HowToGetABacktrace + some help from google about
>> the X window system error.
> I do not know where xfdesktop4 is started or how to start it manually
> inside gdb, so this information is helpful but not useful to me.

Then attach it using gdb -p ?
> If you can help me getting a backtrace I am willing to help, but I
> cannot provide you with further information right now.

Everything is in the wiki page I gave.


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