Ubuntu
linux package

disable shiftfs

Bug #2038522 reported by Andrea Righi
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Triaged
Medium
Unassigned
Mantic
Won't Fix
Medium
Unassigned

Bug Description

[Impact]

Now that all the filesystems that we officially support have the idmapped mounts capability we can get rid of shiftfs.

The benefit of this change is that we don't have to maintain an out-of-tree filesystem anymore and we can completely rely on upstream features.

[Test case]

lxd was the main user of shiftfs to compensate the lack of idmapped mounts capability of certain filesystems, such as zfs / ceph, but now in mantic also these two filesystem received the support for idmapped mounts (support for zfs was introduced in 2.2.0~rc3 and for ceph see LP: #2032959).

The lxd team provided a positive feedback, testing the latest 6.5 Mantic kernel across all the supported filesystems with shiftfs disabled.

[Fix]

Disable shiftfs in the kernel config and enable unsafe idmapped mounts by default (default=on).

[Regression potential]

The support for idmapped mounts for the ceph filesystem is not applied upstream yet, so we may experience regressions in systems that are using this filesystem. Moreover disabling shiftfs may trigger failures in our testing (testing shiftfs capabilities will obviously fail) or break any other user-space application that is relying on shiftfs (however to our knowledge lxd was the only "official" user or shiftfs; for this reason we may also see potential regressions in lxd).

Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote : Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 2038522

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Dimitri John Ledkov (xnox)
Changed in linux (Ubuntu Mantic):
status: Incomplete → Triaged
Stefan Bader (smb)
Changed in linux (Ubuntu Mantic):
importance: Undecided → Medium
Stefan Bader (smb)
Changed in linux (Ubuntu Mantic):
status: Triaged → Fix Committed
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux/6.5.0-12.12 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-mantic-linux' to 'verification-done-mantic-linux'. If the problem still exists, change the tag 'verification-needed-mantic-linux' to 'verification-failed-mantic-linux'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-mantic-linux-v2 verification-needed-mantic-linux
Andrea Righi (arighi)
tags: added: verification-done-mantic
removed: verification-needed-mantic-linux
Revision history for this message
Andrea Righi (arighi) wrote :

shiftfs has been correctly disabled in 6.5.0-14:

$ uname -r
6.5.0-14-generic
$ sudo modprobe shiftfs
modprobe: FATAL: Module shiftfs not found in directory /lib/modules/6.5.0-14-generic

tags: added: verification-done-mantic-linux
removed: verification-done-mantic
tags: added: verification-done-mantic
removed: verification-done-mantic-linux
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-laptop/6.5.0-1007.10 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-mantic-linux-laptop' to 'verification-done-mantic-linux-laptop'. If the problem still exists, change the tag 'verification-needed-mantic-linux-laptop' to 'verification-failed-mantic-linux-laptop'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-mantic-linux-laptop-v2 verification-needed-mantic-linux-laptop
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-azure/6.5.0-1010.10 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-mantic-linux-azure' to 'verification-done-mantic-linux-azure'. If the problem still exists, change the tag 'verification-needed-mantic-linux-azure' to 'verification-failed-mantic-linux-azure'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-mantic-linux-azure-v2 verification-needed-mantic-linux-azure
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-gcp/6.5.0-1010.10 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-mantic-linux-gcp' to 'verification-done-mantic-linux-gcp'. If the problem still exists, change the tag 'verification-needed-mantic-linux-gcp' to 'verification-failed-mantic-linux-gcp'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-mantic-linux-gcp-v2 verification-needed-mantic-linux-gcp
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-hwe-6.5/6.5.0-14.14~22.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-hwe-6.5' to 'verification-done-jammy-linux-hwe-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-hwe-6.5' to 'verification-failed-jammy-linux-hwe-6.5'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-jammy-linux-hwe-6.5-v2 verification-needed-jammy-linux-hwe-6.5
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-nvidia-6.5/6.5.0-1007.7 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-nvidia-6.5' to 'verification-done-jammy-linux-nvidia-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-nvidia-6.5' to 'verification-failed-jammy-linux-nvidia-6.5'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-jammy-linux-nvidia-6.5-v2 verification-needed-jammy-linux-nvidia-6.5
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-lowlatency-hwe-6.5/6.5.0-14.14.1~22.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-lowlatency-hwe-6.5' to 'verification-done-jammy-linux-lowlatency-hwe-6.5'. If the problem still exists, change the tag 'verification-needed-jammy-linux-lowlatency-hwe-6.5' to 'verification-failed-jammy-linux-lowlatency-hwe-6.5'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: kernel-spammed-jammy-linux-lowlatency-hwe-6.5-v2 verification-needed-jammy-linux-lowlatency-hwe-6.5
Revision history for this message
Roxana Nicolescu (roxanan) wrote :

jammy:lowlatency-hwe-6.5
modprobe: FATAL: Module shiftfs not found in directory /lib/modules/6.5.0-14-lowlatency

jammy:hwe-6.5
modprobe: FATAL: Module shiftfs not found in directory /lib/modules/6.5.0-17-generic

tags: added: verification-done-mantic-linux-azure verification-done-mantic-linux-gcp verification-done-mantic-linux-laptop
removed: verification-needed-mantic-linux-azure verification-needed-mantic-linux-gcp verification-needed-mantic-linux-laptop
tags: added: verification-done-jammy-linux-hwe-6.5 verification-done-jammy-linux-lowlatency-hwe-6.5
removed: verification-needed-jammy-linux-hwe-6.5 verification-needed-jammy-linux-lowlatency-hwe-6.5
tags: added: verification-done-jammy-linux-nvidia-6.5
removed: verification-needed-jammy-linux-nvidia-6.5
Revision history for this message
Brian Murray (brian-murray) wrote :

Ubuntu 23.10 (Mantic Minotaur) has reached end of life, so this bug will not be fixed for that specific release.

Changed in linux (Ubuntu Mantic):
status: Fix Committed → Won't Fix
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