The test is a constant time out in EWS. First time failing in build https://ews-build.webkit.org/#/builders/34/builds/37439, and constantly failing since https://ews-build.webkit.org/#/builders/34/builds/37450 **TIMEOUT** WTF_DataMutex.DoubleLockDeathTest
r278555 (238553@main, Bug 226714) removed DATA_MUTEX_CHECK from DataMutexLocker ctor. It is needed to successfully crash the test.
*** This bug has been marked as a duplicate of bug 227069 ***