[PATCH 0/1] [F linux-aws-5.11] c4.large boot regression in upstream stable patchset 2022-01-19

[Tim Gardner]

SRU Justification

[Impact]

Upstream stable patchset 2022-01-19 as applied to linux-aws-5.11 5.11.0-1029.32_20.04.1 causes a boot regression.

[Fix]

A bisect narrowed down the offending commit. Reverting on top of Ubuntu-aws-5.11-5.11.0-1029.32_20.04.1
solves the issue.

Revert commit caefebc4b66f841612504c9bb3b37ce6a326d994 ("PCI/MSI: Mask MSI-X vectors only on success")

[Test Case]

Install a kernel in a Focal/aws c4.large instance. Check for boot success.

[Where things could go wrong]

Other instance types could fail without this patch, though it is unlikely since
they worked before this stable update.