You have the Binary-NVIDIA Driver loaded, haven't you?
If yes, please report this bug to Nvidia, since nobody here can help you 
because the main part of the driver is closed source and nobody knows, what 
the driver is doing with the memory.
Christian
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/