jdi/EventQueue/remove_l/remove_l004 failed due to "TIMEOUT while waiting for event"

The following test failed in my jdk-13+11 stress testing in
the slowdebug config:

vmTestbase/nsk/jdi/EventQueue/remove_l/remove_l004/TestDescription.java

Here's a snippet of the .jtr file:

==> nsk/jdi/EventQueue/remove_l/remove_l004 TESTING BEGINS
--> debugger: breakpointForCommunication
debugee.stderr> **> debuggee: debuggee started!
debugee.stderr> **> debuggee: before: methodForCommunication();
--> debugger: ......invoking: getEventSet();
debugee.stderr> **> debuggee: before: Thread.sleep
debugee.stderr> **> debuggee: after: Thread.sleep
--> debugger: ...... waiting for breakpoint event
--> debugger: breakpointForCommunication
# ERROR: ##> debugger: ERROR: Exception : nsk.jdi.EventQueue.remove_l.remove_l004$JDITestRuntimeException: JDITestRuntimeException : ** EXCEPTION while waiting for event ** : nsk.jdi.EventQueue.remove_l.remove_l004$JDITestRuntimeException: JDITestRuntimeException : ** TIMEOUT while waiting for event **
The following stacktrace is for failure analysis.
nsk.share.TestFailure: ##> debugger: ERROR: Exception : nsk.jdi.EventQueue.remove_l.remove_l004$JDITestRuntimeException: JDITestRuntimeException : ** EXCEPTION while waiting for event ** : nsk.jdi.EventQueue.remove_l.remove_l004$JDITestRuntimeException: JDITestRuntimeException : ** TIMEOUT while waiting for event **
        at nsk.share.Log.logExceptionForFailureAnalysis(Log.java:428)
        at nsk.share.Log.complain(Log.java:399)
        at nsk.jdi.EventQueue.remove_l.remove_l004.log3(remove_l004.java:115)
        at nsk.jdi.EventQueue.remove_l.remove_l004.runTest(remove_l004.java:260)
        at nsk.jdi.EventQueue.remove_l.remove_l004.runThis(remove_l004.java:190)
        at nsk.jdi.EventQueue.remove_l.remove_l004.run(remove_l004.java:96)
        at nsk.jdi.EventQueue.remove_l.remove_l004.main(remove_l004.java:89)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at PropertyResolvingWrapper.main(PropertyResolvingWrapper.java:104)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:835)
# ERROR: ##> debugger: test phase has not finished normally: debuggee is still alive
--> debugger: ......forcing: vm.exit();
TEST FAILED


The test failed in 3/3 'slowdebug' configs, but did not fail in
3/3 'fastdebug' or 3/3 'release' configs.