| 2023-12-04 19:35:25 |
Steve Langasek |
bug |
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added bug |
| 2023-12-04 19:36:23 |
Steve Langasek |
bug task added |
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livecd-rootfs (Ubuntu) |
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| 2023-12-04 19:36:30 |
Steve Langasek |
bug task added |
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linux (Ubuntu) |
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| 2024-01-23 16:40:54 |
dann frazier |
summary |
livecd-rootfs uses losetup -P for theoretically reliable/synchronous partition setup but it's not reliable in noble |
livecd-rootfs uses losetup -P for theoretically reliable/synchronous partition setup but it's not reliable |
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| 2024-01-24 18:48:07 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/459380 |
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| 2024-01-25 04:23:46 |
Launchpad Janitor |
livecd-rootfs (Ubuntu): status |
New |
Fix Released |
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| 2024-01-31 19:17:19 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~dannf/livecd-rootfs/+git/livecd-rootfs/+merge/459549 |
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| 2024-02-03 16:14:46 |
dann frazier |
nominated for series |
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Ubuntu Mantic |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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util-linux (Ubuntu Mantic) |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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livecd-rootfs (Ubuntu Mantic) |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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linux (Ubuntu Mantic) |
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| 2024-02-03 16:14:46 |
dann frazier |
nominated for series |
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Ubuntu Jammy |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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util-linux (Ubuntu Jammy) |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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livecd-rootfs (Ubuntu Jammy) |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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linux (Ubuntu Jammy) |
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| 2024-02-03 16:14:46 |
dann frazier |
nominated for series |
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Ubuntu Noble |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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util-linux (Ubuntu Noble) |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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livecd-rootfs (Ubuntu Noble) |
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| 2024-02-03 16:14:46 |
dann frazier |
bug task added |
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linux (Ubuntu Noble) |
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| 2024-02-09 15:22:31 |
Catherine Redfield |
bug |
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added subscriber Catherine Redfield |
| 2024-02-18 17:57:52 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/460729 |
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| 2024-02-18 20:18:53 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/460732 |
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| 2024-02-18 20:24:45 |
Michael Hudson-Doyle |
description |
In mantic, we migrated livecd-rootfs to use losetup -P instead of kpartx, with the expectation that this would give us a reliable, race-free way of loop-mounting partitions from a disk image during image build.
In noble, we are finding that it is no longer reliable, and in fact fails rather often.
It is most noticeable with riscv64 builds, which is the architecture where we most frequently ran into problems before with kpartx. The first riscv64+generic build in noble where the expected loop partition device is not available is
https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/noble/cpc/+build/531790
The failure is however not unique to riscv64, and the autopkgtest for the latest version of livecd-rootfs (24.04.7) - an update that specifically tries to add more debugging code for this scenario - has also failed on ppc64el.
https://autopkgtest.ubuntu.com/packages/l/livecd-rootfs/noble/ppc64el
The first failure happened on November 16. While there has been an update to the util-linux package in noble, this did not land until November 23. |
[impact]
In mantic, we migrated livecd-rootfs to use losetup -P instead of kpartx, with the expectation that this would give us a reliable, race-free way of loop-mounting partitions from a disk image during image build.
In noble, we are finding that it is no longer reliable, and in fact fails rather often.
It is most noticeable with riscv64 builds, which is the architecture where we most frequently ran into problems before with kpartx. The first riscv64+generic build in noble where the expected loop partition device is not available is
https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/noble/cpc/+build/531790
The failure is however not unique to riscv64, and the autopkgtest for the latest version of livecd-rootfs (24.04.7) - an update that specifically tries to add more debugging code for this scenario - has also failed on ppc64el.
https://autopkgtest.ubuntu.com/packages/l/livecd-rootfs/noble/ppc64el
The first failure happened on November 16. While there has been an update to the util-linux package in noble, this did not land until November 23.
The losetup usage has been backported to Jammy, and sees frequent failures there.
[test case]
The autopkgtests will provide enough confidence that the changes are not completely broken. Whether the change helps with the races on riscv can be "tested in prod" just as well as any other way.
[regression potential]
If the backport has been done incorrectly, image builds can fail (and the autopkgtests will fail if it has been completely bungled). This can be quickly handled. There is no foreseeable way for this to result in successful builds but broken images, which would be a much more difficult failure mode to unpick. |
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| 2024-02-18 21:43:11 |
Ubuntu Archive Robot |
bug |
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added subscriber Michael Hudson-Doyle |
| 2024-02-19 16:08:01 |
Łukasz Zemczak |
livecd-rootfs (Ubuntu Jammy): status |
New |
Fix Committed |
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| 2024-02-19 16:08:03 |
Łukasz Zemczak |
bug |
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added subscriber Ubuntu Stable Release Updates Team |
| 2024-02-19 16:08:06 |
Łukasz Zemczak |
bug |
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added subscriber SRU Verification |
| 2024-02-19 16:08:09 |
Łukasz Zemczak |
tags |
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verification-needed verification-needed-jammy |
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| 2024-02-19 18:15:59 |
Launchpad Janitor |
livecd-rootfs (Ubuntu Jammy): status |
Fix Committed |
Fix Released |
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| 2024-02-20 08:54:57 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/460810 |
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| 2024-04-29 22:37:07 |
Launchpad Janitor |
merge proposal linked |
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https://code.launchpad.net/~simpoir/livecd-rootfs/+git/livecd-rootfs/+merge/465193 |
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