Public bug reported:
Ubuntu 26.10 Stonking (Development version from 2026-09-20).
Kernel: 7.3.0-5 and 7.3.0-6 (from -proposed)
On a system with a ZFS root, after installation, I am unable to create
or use any additional zfs pools.
Details:
Encrypted ZFS or not doesn't matter
Kernel 7.3.0-5 (OpenZFS 2.4.4-1ubuntu2) and 7.3.0-6 (OpenZFS 2.4.4-1ubuntu3):
FAILS.
Kernel 7.2.0-5 with OpenZFS 2.4.2: WORKS.
Kernel 7.2.0-5 with OpenZFS 2.4.4 (OpenZFS 2.4.4-1ubuntu3): WORKS.
No -proposed, only kernel from -proposed, or all from -proposed as of
submission time tested and gave same results.
Quick reproduction way:
1) Install Ubuntu 26.10 Stonking development with ZFS root. Encrypted or not
does not matter.
2) Boot system. It works as it should.
3) Run the following command:
sudo -i bash -c 'uname -r; zfs version; truncate -s 1G /root/t.img && zpool
create tp /root/t.img; echo "rc=${?}"; zpool list -H tp; zpool destroy tp
2>/dev/null; rm -f /root/t.img'
What it does:
- Prints out the kernel and zfs information.
- Creates a 1G file in /root: /root/t.img.
- Creates a zpool called "tp" on /root/t.img.
- Prints the rc. Working should be 0. Not working is 1.
- Displays the zpool.
- Destroys the pool.
- Removes the file from /root.
Expected result:
rc=0 and a created zpool.
Received result:
rc=1 and no zpool.
If you create the partitions manually and make a manual installation including
a home directory pool (hpool), the hpool cannot be imported, as the userspace
receives ENOENT.
There is a patch to fix this (debian/patches/linux-7.3-kthread-nullfs.patch),
but it is insufficient, as it stores the initial root directory, which is then
the initramfs and not the running root.
I have written a patch that I will submit after I create the bug report
that fixes it in all scenarios I have thought of.
The log supplied shows the commands executed and the outcome. With my
patch it gives rc=0 and works.
// Stefan
ProblemType: Bug
DistroRelease: Ubuntu 26.10
Package: zfsutils-linux 2.4.4-1ubuntu3
ProcVersionSignature: Ubuntu 7.3.0-5.5-generic 7.3.0-rc3
Uname: Linux 7.3.0-5-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.36.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Sep 25 21:14:20 2026
InstallationDate: Installed on 2026-09-25 (0 days ago)
InstallationMedia: Ubuntu 26.10 "Stonking Stingray" - Daily amd64 (20260920)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug stonking
** Attachment added: "Debug log showing system state including the running test
results"
https://bugs.launchpad.net/bugs/2168581/+attachment/6002675/+files/bug-kernel-7.3.0-5-zfs-2.4.4-1ubuntu2.txt
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https://bugs.launchpad.net/bugs/2168581
Title:
Kernel 7.3.0-5 / -6: ZFS not working properly
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