There's some overlap between the two tools. Race conditions often lead to memory errors of the type that ASan can detect. TSan/Helgrind are the way to go if y

There's some overlap between the two tools. Race conditions often lead to memory errors of the type that ASan can detect. TSan/Helgrind are the way to go if you want to find races that happen to be benign most of the time, or lock ordering problems, or races that lead to non-memory problems.