The following test failed in the JDK15 CI:

tools/jpackage/share/EmptyFolderPackageTest.java

Here's a snippet from the log file:

2020-07-10 20:30:30.040 diskimages-helper[43471:946707] DIHelperHDID serveImage: connecting to myDrive 0x430F
2020-07-10 20:30:30.040 diskimages-helper[43471:946707] DIHelperHDID serveImage: register _readBuffer 0x111ee7000
2020-07-10 20:30:30.040 diskimages-helper[43471:946707] DIHelperHDID serveImage: activating drive port 16931
2020-07-10 20:30:30.040 diskimages-helper[43471:946707] DIHelperHDID serveImage: set cache enabled=TRUE returned FAILURE.
2020-07-10 20:30:30.181 diskimages-helper[43471:946707] DIHelperHDID serveImage: set on IO thread=TRUE returned SUCCESS.
2020-07-10 20:30:30.181 diskimages-helper[43471:946707] -processKernelRequest: will sleep received
2020-07-10 20:30:50.751 diskimages-helper[43471:946345] _mountDevEntries: disk1s1 aborting mountpoint postflight because disk image has no band size specified.
2020-07-10 20:30:50.752 diskimages-helper[43471:946345] *useEffectiveIDs**** euid/egid changed to 502,10668 (uid/gid is 502,10668)
2020-07-10 20:30:51.868 diskimages-helper[43471:946345] *useRealIDs******** euid/egid changed to 502,10668 (uid/gid is 502,10668)
Copying???
2020-07-10 20:30:51.868 diskimages-helper[43471:946345] *useEffectiveIDs**** euid/egid changed to 502,10668 (uid/gid is 502,10668)
2020-07-10 20:30:51.882 copy-helper[43559:947380] copying /private/var/folders/fr/m36n2yss1y31czvg7cmtv2g40000gp/T/jdk.incubator.jpackage12092626529828944178/images/image-10084472991856221942 to /Volumes/EmptyFolderPackageTest
2020-07-10 20:30:51.883 copy-helper[43559:947380] About to copy "/var/folders/fr/m36n2yss1y31czvg7cmtv2g40000gp/T/jdk.incubator.jpackage12092626529828944178/images/image-10084472991856221942".
2020-07-10 20:30:55.056 hdiutil[43469:946321] helper died
DIHLDiskImageCreate() returned 10
(null)
2020-07-10 20:30:55.466 copy-helper[43559:947380] copy error (canceling): /Volumes/EmptyFolderPackageTest/EmptyFolderPackageTest.app/Contents/app/.jpackage.xml: Bad file descriptor
2020-07-10 20:30:55.466 copy-helper[43559:947380] Copy finished with error 9 (Bad file descriptor).
hdiutil: create: returning 10
hdiutil: create failed - No child processes
java.io.IOException: Command [/usr/bin/hdiutil, create, -verbose, -srcfolder, /var/folders/fr/m36n2yss1y31czvg7cmtv2g40000gp/T/jdk.incubator.jpackage12092626529828944178/images/image-10084472991856221942, -volname, EmptyFolderPackageTest, -ov, /var/folders/fr/m36n2yss1y31czvg7cmtv2g40000gp/T/jdk.incubator.jpackage12092626529828944178/images/EmptyFolderPackageTest-tmp.dmg, -fs, HFS+, -format, UDRW] exited with 1 code
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.Executor.executeExpectSuccess(Executor.java:75)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.IOUtils.exec(IOUtils.java:167)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.IOUtils.exec(IOUtils.java:135)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.MacDmgBundler.buildDMG(MacDmgBundler.java:327)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.MacDmgBundler.bundle(MacDmgBundler.java:91)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.MacDmgBundler.execute(MacDmgBundler.java:535)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.Arguments.generateBundle(Arguments.java:680)
at jdk.incubator.jpackage/jdk.incubator.jpackage.internal.Arguments.processArguments(Arguments.java:549)
at jdk.incubator.jpackage/jdk.incubator.jpackage.main.Main.execute(Main.java:98)
at jdk.incubator.jpackage/jdk.incubator.jpackage.main.Main.main(Main.java:52)
Running [/usr/bin/hdiutil, create, -verbose, -size, 178975607, -volname, EmptyFolderPackageTest, -ov, /var/folders/fr/m36n2yss1y31czvg7cmtv2g40000gp/T/jdk.incubator.jpackage12092626529828944178/images/EmptyFolderPackageTest-tmp.dmg, -fs, HFS+]
----------System.err:(3/171)----------

This failure occurred in the jdk-15+32-1515-tier2 CI job set
which includes the fix for the following:

    JDK-8248059 [macos] EmptyFolderPackageTest.java failed "hdiutil: create failed - No child processes"