ProtoStreamJSFFailoverTestCase.testGracefulSimpleFailover seemed to be one of those tests that would fail every now and then on a PR job, but it looks like recently it's failing a lot, often on nightly jobs, and always on Windows:

https://ci.wildfly.org/project.html?projectId=WF&buildTypeId=&tab=testDetails&testNameId=3369504733365641228&order=TEST_STATUS_DESC&branch_WF=__all_branches__&itemsCount=50