Race condition
A race condition or race hazard is the behavior of an electronics, software, or other system where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events. It becomes a bug when one or more of the possible behaviors is undesirable.
Post-Blackness
In "Race and Mixed Race" "The Kinship Schema", Naomi Zack attempts to explain why a person is considered black or white:
“If a person has a black parent, a black grandparent, or a black greatn -grandparent (where n represents any number of past generations), then that person is designated black. But if a person has a white parent, or three white grandparents, or Z white greatn -grandparents (where Z is any odd number and n still represents any number of past generations), then that person is not thereby designated white.”
According to this definition, a person is white if no black ancestors exist, whereas one black person (or "non-white" person) in the line makes or person black, or at least not white anymore.