@shankerror: you also apparently have this TSC unstability, as mentioned in 
your dmesg:
[    1.082774] cpufreq: FSB changing is maybe unstable and can lead to crashes 
and data loss.
[    1.082790] cpufreq: FSB currently at 132 MHz, FID 13.5
[    1.082820] Marking TSC unstable due to cpufreq changes

dmesg seems to suggest this is due to some dynamic bus frequency change which 
causes trouble. I just found out in this (French) thread that people suggest so 
boot with "acpi=off" option...
http://forum.ubuntu-fr.org/viewtopic.php?id=310384
I'm gonna try that. 

On my side, I also just tried 2.6.30-rc5, no change.

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Computer hard locks randomly with ubuntu jaunty
https://bugs.launchpad.net/bugs/355155
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