The following test failed in the JDK21 CI:

jdk/test/lib/process/ProcessToolsStartProcessTest.java

Here's a snippet from the log file:

FAILED: wrong number of lines in OutputAnalyzer output
DEBUG: OutputAnalyzer output: got 12 lines, expected 50. Output follows:
A line on stdout 0
A line on stdout 1
A line on stdout 2
A line on stdout 3
A line on stdout 4
A line on stdout 5
A line on stdout 6
A line on stdout 7
A line on stdout 8
A line on stdout 9
A line on stdout 10
A line on stdout 11
DEBUG: done with OutputAnalyzer stdout.
Test ERROR
----------System.err:(16/1058)----------
java.lang.RuntimeException: One or more tests failed. See output for details.
at ProcessToolsStartProcessTest.main(ProcessToolsStartProcessTest.java:109)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1592)
java.lang.RuntimeException: One or more tests failed. See output for details.
at ProcessToolsStartProcessTest.main(ProcessToolsStartProcessTest.java:109)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1592)

JavaTest Message: Test threw exception: java.lang.RuntimeException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: One or more tests failed. See output for details.

This is a new test that came with the fix for:

JDK-8233725 ProcessTools.startProcess() has output issues when using an OutputAnalyzer at the same time