Backport a3843e8e6e189447e554759c3ba672530f8c7329

Author: duke

test/jdk/sun/tools/jcmd/JcmdBase.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -102,6 +102,8 @@ private static final OutputAnalyzer jcmd(boolean requestToCurrentProcess,
                 launcher.addVMArg(vmArg);
             }
         }
+        // Some command output may be lengthy, disable streaming output to avoid deadlocks
+        launcher.addVMArg("-Djdk.attach.allowStreamingOutput=false");
         if (requestToCurrentProcess) {
             launcher.addToolArg(Long.toString(ProcessTools.getProcessId()));
         }