When jcstress is trying launchingf forked VM, it is passing all its own arguments to it.

It is easyu what consequences would have passing on also something like:
```
-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005
```

I found two occurences:
```
diff --git a/jcstress-core/src/main/java/org/openjdk/jcstress/TestExecutor.java b/jcstress-core/src/main/java/org/openjdk/jcstress/TestExecutor.java
index 0d3129a..afe240d 100644
--- a/jcstress-core/src/main/java/org/openjdk/jcstress/TestExecutor.java
+++ b/jcstress-core/src/main/java/org/openjdk/jcstress/TestExecutor.java
@@ -38,6 +38,7 @@ import java.io.*;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collectors;
 
 /**
  * Manages test execution for the entire run.
@@ -279,7 +280,7 @@ public class TestExecutor {
                 command.addAll(OSSupport.getJavaInvokeArguments());
 
                 // jvm args
- command.addAll(task.jvmArgs);
+ command.addAll(task.jvmArgs.stream().filter(s -> !s.startsWith("-agentlib")).collect(Collectors.toList()));
 
                 if (VMSupport.compilerDirectivesAvailable()) {
                     command.add("-XX:CompilerDirectivesFile=" + compilerDirectives.getAbsolutePath());
diff --git a/jcstress-core/src/main/java/org/openjdk/jcstress/vm/VMSupport.java b/jcstress-core/src/main/java/org/openjdk/jcstress/vm/VMSupport.java
index f3025b7..a867925 100644
--- a/jcstress-core/src/main/java/org/openjdk/jcstress/vm/VMSupport.java
+++ b/jcstress-core/src/main/java/org/openjdk/jcstress/vm/VMSupport.java
@@ -461,6 +461,7 @@ public class VMSupport {
 
         for (Config config : configs) {
             List<String> args = config.origArgs();
+ args = args.stream().filter(s -> !s.startsWith("-agentlib")).collect(Collectors.toList());
             try {
                 List<String> line = new ArrayList<>(args);
                 line.add(SimpleTestMain.class.getName());
```

Where the case in VMsupport.java is quite straightforward to drop the debugger, in TestExecutor.java I can imagine it may be useful to debug the subprocesses, however the wrapper Should not just copy the debug arg (port clash...) but if this is needed, there may be parameter for jcstress, some `-debugingString` which will append itself to forked vm. If you think this is worthy, I will implement it together with this and https://bugs.openjdk.org/browse/CODETOOLS-7903748