To answer my own question above, I found these posts: https://lkml.org/lkml/2018/1/8/81 .
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1629509 Title: Cannot mount overlay with upperdir on overlay Status in linux package in Ubuntu: Confirmed Status in linux source package in Xenial: Confirmed Bug description: I have a docker setup using overlay as its storage driver. I mount an overlay in the container. Both the lower, upper and work directories are themselves on an overlay filesystem. This mount started to fail after upgrading to kernel 4.4.0-38 from 4.4.0-34 with the error message "overlayfs: filesystem on '/mnt/overlay/upper' not supported as upperdir". ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-38-generic 4.4.0-38.57 ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19 Uname: Linux 4.4.0-38-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: shaw 2257 F.... pulseaudio /dev/snd/controlC1: shaw 2257 F.... pulseaudio CurrentDesktop: Unity Date: Fri Sep 30 20:06:03 2016 HibernationDevice: RESUME=UUID=f23b927f-5173-43fe-9269-8c7714fb0927 InstallationDate: Installed on 2016-07-23 (69 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) MachineType: Dell Inc. XPS13 9333 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-38-generic root=UUID=306f5ab9-de0e-4920-be20-3f4081e13c7e ro persistent quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-38-generic N/A linux-backports-modules-4.4.0-38-generic N/A linux-firmware 1.157.3 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/19/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A04 dmi.board.vendor: Dell Inc. dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA04:bd03/19/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1: dmi.product.name: XPS13 9333 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1629509/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
