How to kill a JUnit test run in Eclipse that has entered an infinite loop

I have some Java code that I am unit testing using JUnit, running inside Eclipse (Neon). It so happens that some code under test has a bug in it, causing it to enter an infinite loop. The JUnit run then, of course, does not finish. How do I kill the test run?

The button for stopping the test run ("Stop JUnit Test Run") does not work well: the GUI seems to think that it has stopped the test run, but a look at the CPU activity (using top, for example), shows that a Java thread is still running. I can kill the thread myself by sending it a kill signal. But that seems a kludge and is inconvenient. Is there a better way, available within Eclipse itself?

Kill it from the console view, using the red button. This stops the process.

Stopping it from the junit view only asks it to stop.