It looks like this is OK with X-4.15 but not X-4.4 / T-4.4. Maybe something in the kernel has to do with this as well.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed in Ubuntu. https://bugs.launchpad.net/bugs/1854298 Title: ubuntu_unionmount_ovlfs failed on X with latest update in upstream testsuite Status in ubuntu-kernel-tests: New Status in linux-signed package in Ubuntu: New Bug description: A bisect shows this test is failing since commit 2104e51db38 (Simplify initialization of __upper ) The test will fail with: /mnt/a/foo100: File unexpectedly on upper layer For the complete test log, please refer the attachment. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-169-generic 4.4.0-169.198 ProcVersionSignature: User Name 4.4.0-169.198-generic 4.4.197 Uname: Linux 4.4.0-169-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.21 Architecture: amd64 Date: Thu Nov 28 04:21:52 2019 SourcePackage: linux-signed UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1854298/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp

