** Also affects: linux-gcp-6.8 (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux-gcp (Ubuntu)
** No longer affects: linux-gcp (Ubuntu Jammy)
** Changed in: linux-gcp-6.8 (Ubuntu Jammy)
Status: New => Fix Released
** Changed in: linux-gcp-6.8 (Ubuntu Jammy)
Assignee: (unassigned) => Ian Whitfield (ijwhitfield)
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https://bugs.launchpad.net/bugs/2085904
Title:
Enable IOMMU Passthrough by default
Status in linux-gcp-6.8 package in Ubuntu:
New
Status in linux-gcp-6.8 source package in Jammy:
Fix Released
Bug description:
SRU Justification
[Impact]
C3 bare metal instances run into a problem on 6.8 kernels due to Intel
IOMMU being enabled by default. After performing enough disk-intensive
work on the instance, the system becomes unusable and reports I/O
errors at the command line until rebooted, losing data in the process.
The root issue is being worked on long-term, but in the meantime we
will apply a workaround to the issue for affected customers. This fix
has a negative impact on security, so it is limited to Jammy kernels
for which this issue is a regression. Noble kernels have always had
this problem and therefore will be waiting for the long-term fix.
[Fix]
Change the kernel config to use IOMMU passthrough by default.
[Test Plan]
Perform up to 50 kernel builds on the instance in sequence. Failures
on affected instances are usually detected after only 1 or 2.
[Regression potential]
Regression potential is especially low for Jammy as we are essentially
reverting a breaking change.
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