Serious problems with Xorg:
xorg-server version: 1.6.3.901

same problems: crash

Using UML instead of Xen and Xorg 1.5.3-r6
Launching:
X -ac :1
startkde

We get blank screen of death

kded: ERROR: Communication problem with kded, it probably crashed.
kcminit_startup: cannot connect to X server 192.168.1.100:1
ksmserver: cannot connect to X server 192.168.1.100:1

on the shell where X was started:

Errors from xkbcomp are not fatal to the X server
(EE) NVIDIA(0): EVO Push buffer channel allocation failed
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate EVO DMA push buffer
(EE) NVIDIA(0):  *** Aborting ***

Backtrace:
0: X(xorg_backtrace+0x26) [0x4ea136]
1: X(xf86SigHandler+0x39) [0x487739]
2: /lib/libc.so.6 [0x7f3f2d6e4290]
3: /usr/lib64/xorg/modules/drivers//nvidia_drv.so [0x7f3f2b1b085e]
4: /usr/lib64/xorg/modules/drivers//nvidia_drv.so [0x7f3f2b1b54d8]
5: /usr/lib64/xorg/modules/drivers//nvidia_drv.so [0x7f3f2b3d1e28]
6: /usr/lib64/xorg/modules/drivers//nvidia_drv.so [0x7f3f2b3d25de]
7: /usr/lib64/xorg/modules/drivers//nvidia_drv.so [0x7f3f2b3bc314]
8: X(AddScreen+0x1c8) [0x42fe38]
9: X(InitOutput+0x240) [0x466a00]
10: X(main+0x27e) [0x4305ce]
11: /lib/libc.so.6(__libc_start_main+0xe6) [0x7f3f2d6d05c6]
12: X [0x42fb89]

Fatal server error:
Caught signal 11.  Server aborting

Using Xnest, instead:
# Xnest -ac :1
No protocol specified

Fatal server error:
Unable to open display ":0.0".

Insane!

We are stuck.
:-(



Same test using UML with KDE inside.
The problem must be here! We should open a bug report.