At this URL find built rpms (x86_64 and i686 only) that you can install on a Fedora 12 (or rawhide, probably) system. These are the upstream kernel du jour with the current utrace-ptrace branch code (see rpm changelog for commit id). (I tried an f12-flavored build too, but it looks like the current upstream code does not build on ppc.)
I tried ptrace-tests on this kernel. step-fork fails as expected, this kernel doesn't have that (utrace-unrelated) upstream fix. On i686, I get no other ptrace-tests failures. On x86_64, detach-sigkill-race consistently fails in tests/ but succeeds in biarch-tests/. Hmm, looks like that fails on stock F-12 kernel (i.e. vanilla ptrace) too, so not a regression. Thanks, Roland