Random X lockup

I have a problem with X, I have random lockup of X, when happen i can't use mouse or keyboard.

Using a SSH remote session I can see that X taking 99.9% cpu.

I have this problem with all version of kernel, linux distributions, xorg versions.

Reading some forum, I can conclude:

- The crash occurs on various hardware

-- CPU: P4 3Ghz, AMD Athlon Thunderbird 1400, AMD Athlon 900Mhz, Athlon XP 1500+, Pentium III 866MHz -- GFX cards: Radeon 9200, Radeon 9700, NVidia GeForce2 GTS/Pro, GeForce Ultra 5700, Geforce FX 5200

-- M/B: Abit AT7 (VIA KT333), SiS P4S61, (TODO add more mobos)
-- Mem: various sizes

- It occurs on various w/ms like: kde, gnome, ion2, fluxbox

- It occurs on various kernel versions: 2.4.23-ck1 - 2.6.21

- It occurs on various X versions:
--XFree 4.3 - ??
--Xorg up to 7.2

-Reports in various distributions: debian, mandrake, fedora, gentoo, ubuntu, opensuse

Sympthoms:

- X CPU usage 100%
- Keyboard is not working

- Mouse is working but nothing is clickable (in some cases mouse is not working any more)

- Magic SysRq is possible
- SSHing in from remote server and killing X is possible.

I can't solve this problem since years :-(
please help me!
Thanks

Davide Nitti
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