Out Of Memory Issue On test-osuosl-aix72-ppc64-5

[steelhead31]

** ppc64_aix - StreamingBody and ThreadStartTest fail with out of memory issues on test-osuosl-aix72-ppc64-5

java/net/httpclient/StreamingBody.java
...
iteration: 76
03:27:10  [47.812s][warning][os,thread] Failed to start thread "Unknown thread" - pthread_create failed (11=EAGAIN) for attributes: stacksize: 2112k, guardsize: 0k, detached.
03:27:10  [47.812s][warning][os,thread] Failed to start the native thread for java.lang.Thread "HttpClient-377-SelectorManager"
03:27:10  test StreamingBody.test("https://127.0.0.1:58465/https2/streamingbody/z"): failure
03:27:10  java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached
03:27:10  	at java.base/java.lang.Thread.start0(Native Method)
03:27:10  	at java.base/java.lang.Thread.start(Thread.java:809)
03:27:10  	at java.net.http/jdk.internal.net.http.HttpClientImpl.start(HttpClientImpl.java:337)
03:27:10  	at java.net.http/jdk.internal.net.http.HttpClientImpl.create(HttpClientImpl.java:271)
03:27:10  	at java.net.http/jdk.internal.net.http.HttpClientBuilderImpl.build(HttpClientBuilderImpl.java:135)
03:27:10  	at StreamingBody.test(StreamingBody.java:102)


javax/management/mxbean/ThreadStartTest.java
05:44:38  STDOUT:
05:44:38  [0.312s][warning][os,thread] Failed to start thread "Unknown thread" - pthread_create failed (11=EAGAIN) for attributes: stacksize: 2112k, guardsize: 0k, detached.
05:44:38  [0.312s][warning][os,thread] Failed to start the native thread for java.lang.Thread "Thread-911"
05:44:38  STDERR:
05:44:38  java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached
05:44:38  	at java.base/java.lang.Thread.start0(Native Method)
05:44:38  	at java.base/java.lang.Thread.start(Thread.java:809)
05:44:38  	at ThreadStartTest.main(ThreadStartTest.java:53)
05:44:38  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
05:44:38  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
05:44:38  	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
05:44:38  	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
05:44:38  	at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
05:44:38  	at java.base/java.lang.Thread.run(Thread.java:840)

...

Example of new test added via the upstream PR running in this Jenkins job:
Grinder/9156 scratch that, will need a PR to aqa-tests to support this case (new tests coming in from an upstream PR, instead of pulling from merged material from the mirror repository.

Originally posted by @smlambert in adoptium/aqa-tests#5137 (comment)