langtools\test\jdk\jshell\CommandCompletionTest.java fails on some windows machines. The 'retain editor |' test fails to pick up a dvd drive. A slightly edited ReplToolTesting.jjava shows the output below. This is from running the test on windows7 command line on a machine with a dvd rw, with simple jtreg call:
sh jtreg -jdk:d:\jdk\9u135 -dir:d:\ws\b1082\langtools\test jdk/jshell/CommandCompletionTest.java
Full jtr files (edited output and as is in openjdk) are attached.
[DEBUG] assertCompletion(/retain editor |, false, [Ljava.lang.String;@1994520
[DEBUG] completion:C:\\
[DEBUG] completion:D:\\
[DEBUG] completion:E:\\
[DEBUG] completion:G:\\
[DEBUG] expected:C:\\
[DEBUG] expected:D:\\
[DEBUG] expected:E:\\
[DEBUG] expected:F:\\
[DEBUG] expected:G:\\
test CommandCompletionTest.testRetain(): failure
java.lang.AssertionError: Command: /retain editor |, output: [C:\\, D:\\, E:\\, G:\\]: lists don't have the same size expected [5] but found [4]
at org.testng.Assert.fail(Assert.java:94)
at org.testng.Assert.failNotEquals(Assert.java:496)
at org.testng.Assert.assertEquals(Assert.java:125)
at org.testng.Assert.assertEquals(Assert.java:372)
at org.testng.Assert.assertEquals(Assert.java:539)
at ReplToolTesting.assertCompletion(ReplToolTesting.java:464)
at ReplToolTesting.assertCompletion(ReplToolTesting.java:453)
at CommandCompletionTest.lambda$testRetain$49(CommandCompletionTest.java:209)
at ReplToolTesting$PromptedCommandOutputStream.write(ReplToolTesting.java:770)
at ReplToolTesting$PromptedCommandOutputStream.write(ReplToolTesting.java:786)
at java.io.PrintStream.write(java.base@9-ea/PrintStream.java:480)
at sun.nio.cs.StreamEncoder.writeBytes(java.base@9-ea/StreamEncoder.java:233)
at sun.nio.cs.StreamEncoder.implFlushBuffer(java.base@9-ea/StreamEncoder.java:312)
at sun.nio.cs.StreamEncoder.implFlush(java.base@9-ea/StreamEncoder.java:316)
at sun.nio.cs.StreamEncoder.flush(java.base@9-ea/StreamEncoder.java:153)
at java.io.OutputStreamWriter.flush(java.base@9-ea/OutputStreamWriter.java:256)
at jdk.internal.jline.console.ConsoleReader.readLine(jdk.internal.le@9-ea/ConsoleReader.java:2337)
at jdk.internal.jline.console.ConsoleReader.readLine(jdk.internal.le@9-ea/ConsoleReader.java:2278)
at jdk.internal.jshell.tool.ConsoleIOContext.readLine(jdk.jshell@9-ea/ConsoleIOContext.java:179)
at jdk.internal.jshell.tool.JShellTool.run(jdk.jshell@9-ea/JShellTool.java:790)
at jdk.internal.jshell.tool.JShellTool.start(jdk.jshell@9-ea/JShellTool.java:538)
at jdk.internal.jshell.tool.JShellTool.start(jdk.jshell@9-ea/JShellTool.java:491)
at ReplToolTesting.testRaw(ReplToolTesting.java:256)
at ReplToolTesting.test(ReplToolTesting.java:213)
at ReplToolTesting.test(ReplToolTesting.java:201)
at CommandCompletionTest.testRetain(CommandCompletionTest.java:203)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-ea/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-ea/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:535)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:220)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:184)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-ea/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@9-ea/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:535)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.lang.Thread.run(java.base@9-ea/Thread.java:843)

This is from running the test on windows7 command line on a machine with a dvd rw.
sh jtreg -jdk:d:\jdk\9u135 -dir:d:\ws\b1082\langtools\test jdk/jshell/CommandCompletionTest.java