Comment 0 for bug 1990849

Since 5.15.0-48.54 LXD containers using shiftfs ontop of ZFS or TMPFS are broken.

Reproducer steps:

```
sudo snap install lxd
sudo snap set lxd shiftfs.enable=true
sudo lxd init --auto
lxc storage create zfs zfs
lxc launch images:ubuntu/jammy c1 -s zfs
lxc exec c1 -- touch /root/foo
touch: cannot touch '/root/foo': Value too large for defined data type
```

Expected result can be achieved by disabling shiftfs:

```
sudo snap set lxd shiftfs.enable=false
lxc launch images:ubuntu/jammy c2 -s zfs
lxc exec c2 -- touch /root/foo
lxc exec c2 -- ls -la /root/foo
-rw-r--r-- 1 root root 0 Sep 26 14:00 /root/foo
```

Kernel 5.15.0-47-generic does not exhibit this issue.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-48-generic 5.15.0-48.54
ProcVersionSignature: Ubuntu 5.15.0-48.54-generic 5.15.53
Uname: Linux 5.15.0-48-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: user 2240 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 26 14:55:52 2022
InstallationDate: Installed on 2022-03-04 (205 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220228)
MachineType: LENOVO 20R1000RUS
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-48-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.15.0-48-generic N/A
 linux-backports-modules-5.15.0-48-generic N/A
 linux-firmware 20220329.git681281e4-0ubuntu3.5
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2021
dmi.bios.release: 1.34
dmi.bios.vendor: LENOVO
dmi.bios.version: N2QET40W(1.34 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20R1000RUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.15
dmi.modalias: dmi:bvnLENOVO:bvrN2QET40W(1.34):bd04/15/2021:br1.34:efr1.15:svnLENOVO:pn20R1000RUS:pvrThinkPadX1Carbon7th:rvnLENOVO:rn20R1000RUS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20R1_BU_Think_FM_ThinkPadX1Carbon7th:
dmi.product.family: ThinkPad X1 Carbon 7th
dmi.product.name: 20R1000RUS
dmi.product.sku: LENOVO_MT_20R1_BU_Think_FM_ThinkPad X1 Carbon 7th
dmi.product.version: ThinkPad X1 Carbon 7th
dmi.sys.vendor: LENOVO