kernel 4.15.0-44 cannot mount ext4 fs with meta_bg enabled

Starting with kernel 4.15.0-44 ext4 filesystem with meta_bg feature enabled can no longer be mounted.

Steps to reproduce:

- create two empty file and setup loopback devices on these files
dd if=/dev/zero of=/loop1 bs=1M count=50
losetup /dev/loop1 /loop1
dd if=/dev/zero of=/loop2 bs=1M count=50
losetup /dev/loop2 /loop2

- create a ext4 fs with meta_bg enabled on loop1:

mkfs.ext4 -O ^resize_inode,+meta_bg /dev/loop1

- create a ext4 fs without any options on loop2:

mkfs.ext4 /dev/loop2

- try to mount the filesystems

mkdir /mnt/loop1
mkdir /mnt/loop2
mount /dev/loop1 /mnt/loop1
mount /dev/loop1 /mnt/loop2

Expected behaviour:
All mounts succeed without error.

Actual behaviour:

root@xubu-18-04:~# mount /dev/loop1 /mnt/loop1
mount: /mnt/loop1: mount(2) system call failed: Structure needs cleaning.

See also a similar bug in fedora and debian:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903838

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903838

with a suspected patch by Theodore Ts'o to fix the issue: (Not tested)

https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=903838;filename=ext4-fix-false-negatives-and-false-positives-in-ext4.patch;msg=26

Additional info:

root@xubu-18-04:~# lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04

root@xubu-18-04:~# apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 4.15.0.44.46
  Candidate: 4.15.0.44.46
  Version table:
 *** 4.15.0.44.46 500
        500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
        100 /var/lib/dpkg/status
     4.15.0.20.23 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: vagrant 1242 F.... pulseaudio
CurrentDesktop: XFCE
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2019-01-29 (0 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
IwConfig:
 lo no wireless extensions.

 enp0s3 no wireless extensions.
Lsusb:
 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
Package: linux (not installed)
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-44-generic root=UUID=a335a238-56df-4705-90d6-6e644fcaf8f9 ro quiet splash
ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-44-generic N/A
 linux-backports-modules-4.15.0-44-generic N/A
 linux-firmware 1.173.3
RfKill:

StagingDrivers: vboxvideo
Tags: bionic staging
Uname: Linux 4.15.0-44-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.family: Virtual Machine
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH