Kernel_task using 16 Million Terabytes of memory - what's causing this?

According to Activity Monitor kernel_task is using 16,777,216 TB of virtual memory.
Obviously, there is some (overflow?) bug somewhere (is that number the maximum allowable memory on a 64-bit system?), and Virtual Memory doesn't really mean much in the real world, but is there a way to track down what is causing this, given that kernel_task going wrong can bring down the whole system.
This reappears after a restart - and in fact for the first time in memory my computer locked up a few days ago, so I'm wondering if there is a connection.
Thanks

You have a Mid 2010 15-inch MacBook Pro and your log is showing a problem with the NVIDIA graphic card.
These MacBooks have got a defective NVIDIA graphic card that may cause unexpected restarts, black screens, kernel panics... See > http://support.apple.com/kb/TS4088
Fortunately, Apple is repairing all of those MacBooks for free, so make a backup of your data and take your MacBook Pro to an Apple Store or reseller

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    SteveG(AudioMasters) wrote:
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