Public bug reported:
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"
[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
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Description changed:
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:
- * f49ac8ad3f86: "UBUNTU: SAUCE: swiotlb: Split up single swiotlb lock"
- * dd05f606dda8: "UBUNTU: SAUCE: swiotlb: allocate memory in a cache-friendly
way"
- * f8579e79cad7: "UBUNTU: SAUCE: swiotlb: use bitmap to track free slots"
+ * 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"
[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
** Description changed:
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"
[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
+ * SF: #00405149
** Description changed:
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"
[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
+ * SF#00405149
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https://bugs.launchpad.net/bugs/2096813
Title:
Ubuntu 20.04 confidential VM deployments are failing
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