The following test failed on Linux X64 in a slowdebug config using
jdk-13+10 bits:

com/sun/jdi/JdbStopThreadidTest.java

The test failed in 1 of 3 'slowdebug' bits runs. It did not fail at all in the
'fastdebug' or 'release' bits runs.

Here's a snippet from the failing log file:

[jdb] Breakpoint hit: "thread=MYTHREAD-2", JdbStopThreadidTestTarg$MyThread.brkMethod(), line=100 bci=0
[jdb] 100 }
[jdb]
[jdb] MYTHREAD-2[1]
> cont
[jdb] >
[jdb] The application exited
[jdb]
> quit
----------System.err:(18/1159)----------
java.lang.RuntimeException: Unexpected IO error while writing command 'quit' to jdb stdin stream
        at lib.jdb.Jdb.command(Jdb.java:232)
        at lib.jdb.Jdb.quit(Jdb.java:260)
        at lib.jdb.Jdb.shutdown(Jdb.java:106)
        at lib.jdb.JdbTest.shutdown(JdbTest.java:129)
        at lib.jdb.JdbTest.run(JdbTest.java:97)
        at JdbStopThreadidTest.main(JdbStopThreadidTest.java:106)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:835)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Unexpected IO error while writing command 'quit' to jdb stdin stream
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Unexpected IO error while writing command 'quit' to jdb stdin stream
----------rerun:(34/3698)*----------