The following test fails in the JDK15 CI:

jdk/jshell/UserJdiUserRemoteTest.java

This test failure is due to an agentvm mode timeout:

#section:testng
----------messages:(7/215)----------
command: testng UserJdiUserRemoteTest
reason: User specified action: run testng UserJdiUserRemoteTest
Mode: agentvm
Agent id: 4
Timeout refired 480 times
Timeout information:
elapsed time (seconds): 540.036
----------configuration:(10/778)*----------

<snip>

test result: Error. Agent communication error: java.net.SocketTimeoutException: Read timed out; check console log for any additional details

PLEASE, DO NOT ADD OTHER FAILURE MODES TO THIS BUG.