A lot of problems we've seen in Fedora bugzilla from our slab debug kernels have been driver specific though (or out-of-tree junk which is another great argument for 'poison kfree in non-debug kernels'), so getting it into your nightly tests isn't really going to be the end-all of this class of bug.
I believe the future lies in tools like Coverity's checker, as it's the only way we can feasibly get complete coverage.
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