Long test killer doesn't kill the JVM on Windows

[ERROR] Test org.infinispan.client.hotrod.impl.iteration.ProtobufRemoteIteratorIndexingTest.testFilteredIterationWithQuery has been running for more than 300 seconds. Interrupting the test thread and dumping threads of the test suite process and its children.
Cannot find jstack in T:\opt\windows\x86_64\openjdk-1.8.0\jre, programmatically dumping thread stacks of testsuite process to C:\home\jenkins\workspace\jdg-7.3.x-jdg-func-ispn-testsuite-win-openjdk\b521375b\infinispan\client\hotrod-client\threaddump-org_infinispan_client_hotrod_impl_iteration_ProtobufRemoteIteratorIndexingTest_testFilteredIterationWithQuery-2019-05-10.log
Interrupted thread testng-ProtobufRemoteIteratorIndexingTest (57).
Killed processes 9904
[ERROR] Test org.infinispan.client.hotrod.impl.iteration.ReplFailOverRemoteIteratorTest.testFailOver has been running for more than 300 seconds. Interrupting the test thread and dumping threads of the test suite process and its children.
Cannot find jstack in T:\opt\windows\x86_64\openjdk-1.8.0\jre, programmatically dumping thread stacks of testsuite process to C:\home\jenkins\workspace\jdg-7.3.x-jdg-func-ispn-testsuite-win-openjdk\b521375b\infinispan\client\hotrod-client\threaddump-org_infinispan_client_hotrod_impl_iteration_ReplFailOverRemoteIteratorTest_testFailOver-2019-05-10.log
Interrupted thread testng-ReplFailOverRemoteIteratorTest (62).
Killed processes 9904