A concurrent program is analyzed for the presence of data races by the creation of a sequential program from the concurrent program. The sequential program contains assertions which can be verified by a sequential program analysis tool, and which, when violated, indicate the presence of a data race. The sequential program emulates multiple executions of the concurrent program by nondeterministically scheduling asynchronous threads of the concurrent program on a single runtime stack and nondeterministically removing the currently-executing thread from the stack before instructions of the program. Checking functions are used to provide assertions for data races, along with a global access variable, which indicates if a variable being analyzed for data races is currently being accessed by any threads.