I see the same issue with Karmic 2.6.31-14.  Found reports that it is caused by 
the combination of the Cisco VPN client, WIFI, and a multi-core cpu.  Disabling 
all but one core while running the cisco vpnclient stopped the crash in my case.
echo 0 > /sys/devices/system/cpu/cpu1/online

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computer freezes with flashing "Num Lock" and "Caps Lock" lights (kernel?)
https://bugs.launchpad.net/bugs/372671
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