** Changed in: linux-oem-6.11 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2110178
Title:
The system with VMD enabled may encounter hang
Status in HWE Next:
New
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.11 source package in Noble:
In Progress
Bug description:
[Impact]
After 6.11.0-1009-oem kernel, we merged the sauce patch of the VMD PCH
support, and it may lead to a system hang when trying to access /proc/iomem
directly.
[Fix]
The VMD PCH support patches still didn't find its way to the upstream, and
Intel need more time to process it. So, we simply fix this issue by using
static strings.
[Test]
1. Boot up the machine with VMD enabled
2. Run `sudo fwts -q --stdout-summary -r mtrr mtrr` to make it access
/proc/iomem directly
3. It should show FAILED_MEDIUM
4. Reboot and re-try step 2 for around 10 times
5. If it fails, it shows Killed
[Where problems could occur]
Only change the strings to static, it increases the kernel size a couple
bytes.
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