Ubuntu
linux-azure package

Ubuntu 20.04 confidential VM deployments are failing

  1. Jammy (22.04)
  2. Bug #2096813
Bug #2096813 reported by John Cabaj
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-azure (Ubuntu)
New
Undecided
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Jammy
Fix Released
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Bug Description

SRU Justification

[Impact]

* 20.04 Azure CVM (with 5.15 kernel) instances are failing to boot with high reproducibility

[Fix]

* Clean reverts of the following commits:
* 8bd834015a5e: "UBUNTU: SAUCE: swiotlb: Split up single swiotlb lock"
* 3db34e258474: "UBUNTU: SAUCE: swiotlb: allocate memory in a cache-friendly way"
* 9e1b646a9cac: "UBUNTU: SAUCE: swiotlb: use bitmap to track free slots"

* Backport "cbf53074a528: swiotlb: Honour dma_alloc_coherent() alignment in swiotlb_alloc() from upstream"

[Test Plan]

* Compile tested
* Boot tested
* Tested with Azure images, booted successfully 25 consecutive times

[Regression potential]

* Changes isolated, minimal regression risk. Changes were SAUCE patches, so reverting back to upstream functionality.
* Likely small I/O performance hit under heavy I/O, but alleviates system hangs

[Other info]

* SF#00405149

See original description
John Cabaj (john-cabaj)
description: updated
description: updated
description: updated
John Cabaj (john-cabaj)
Changed in linux-azure (Ubuntu Jammy):
status: New → Fix Committed
John Cabaj (john-cabaj)
description: updated
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-azure/5.15.0-1081.90 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-azure' to 'verification-done-jammy-linux-azure'. If the problem still exists, change the tag 'verification-needed-jammy-linux-azure' to 'verification-failed-jammy-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-jammy-linux-azure-v2 verification-needed-jammy-linux-azure
Revision history for this message
John Cabaj (john-cabaj) wrote :

Commits are at the tip of the release. Will be further tested by Microsoft prior to stakeholder-signoff.

Changed in linux-azure (Ubuntu Jammy):
status: Fix Committed → Fix Released
tags: added: verification-done-jammy-linux-azure
removed: verification-needed-jammy-linux-azure
Revision history for this message
Timo Aaltonen (tjaalton) wrote : Update Released

The verification of the Stable Release Update for linux-azure has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

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

This bug is awaiting verification that the linux-azure-fips/5.15.0-1082.91+fips1 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-azure-fips' to 'verification-done-jammy-linux-azure-fips'. If the problem still exists, change the tag 'verification-needed-jammy-linux-azure-fips' to 'verification-failed-jammy-linux-azure-fips'.

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-azure-fips-v2 verification-needed-jammy-linux-azure-fips
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