** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1895980
Title:
Unexpected warning when hibernating
Status in linux-azure package in Ubuntu:
In Progress
Status in linux-azure source package in Focal:
Fix Committed
Bug description:
[Impact]
After the initial support for hibernation with Hyper-V was added to
linux-azure, the following warning is now seem when the system
hibernates:
...
[ 58.847939] Disabling non-boot CPUs ...
[ 58.852140] smpboot: CPU 1 is now offline
[ 58.857921] smpboot: CPU 2 is now offline
[ 58.863623] smpboot: CPU 3 is now offline
[ 58.869363] unchecked MSR access error: WRMSR to 0x40000106 (tried to write
0x412d4f49 000100ee) at rIP: 0xffffffff9ee1d9b8 (hv_cpu_die+0xe8/0x110)
...
The warning is harmless but it can be fixed by upstream commit
38dce4195f0d (x86/hyperv: Properly suspend/resume reenlightenment
notifications")
[Test Case]
Using a bionic instance azure with the latest 5.4 kernel, perform the
following steps:
1. Ensure kvm.ko is loaded.
2. Configure the system for hibernation following the steps in
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1880032/comments/14
3. Monitor the console via the azure portal.
4. Hibernate the system with "echo disk > /sys/power/state".
The message above shouldn't be shown anymore once the issue is fixed.
[Regression Potential]
Hibernation is not in use yet and any regressions shouldn't be
critical.
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