Apparently during refactoring to use gtest unittest_lockdep was broken. In file src/test/common/test_lockdep.cc I can see
which now causes test to skip if CEPH_DEBUG_MUTEX is set. However it should be otherwise: if CEPH_DEBUG_MUTEX is NOT set skip the test. And in Ceph 14 this statement reads:
Adding missing "n" fixes the test and gets expected behaviour.