$ git checkout b2cc23398e8166b38f8715026273503b081c2a7a # build kernel and test, make sure it's bad
$ git checkout b2cc23398e8166b38f8715026273503b081c2a7a^ # build kernel and test, make sure it's good
If we are sure b2cc23398e8166b38f8715026273503b081c2a7a is the offending commit, let's report back to upstream.
$ git checkout b2cc23398e8166b 38f871502627350 3b081c2a7a
# build kernel and test, make sure it's bad
$ git checkout b2cc23398e8166b 38f871502627350 3b081c2a7a^
# build kernel and test, make sure it's good
If we are sure b2cc23398e8166b 38f871502627350 3b081c2a7a is the offending commit, let's report back to upstream.