JFR will be disabled with a warning message if it is enabled during CDS dumping.
The user will see the following warning message:

    Java HotSpot(TM) 64-Bit Server VM warning: JFR will be disabled during CDS dumping
    if JFR is enabled during CDS dumping such as in the following command line:

    $java -Xshare:dump -XX:StartFlightRecording=dumponexit=true