[$] New kernel tools: wprobes, KStackWatch, and KFuzzTest

The kernel runs in a special environment that makes it difficult to use
many of the development tools that are available to user-space developers.
Kernel developers often respond by simply doing without, but the truth is
that they need good tools as much as anybody else. Three new tools for the
tracking down of bugs have recently landed on the linux-kernel mailing
list; here is an overview.