Public bug reported: [Impact]
In LP: #1918694 we applied a fix and a workaround to solve the hibernation issues on c5.18xlarge. The workaround was in the form of a SAUCE patch: "UBUNTU: SAUCE: aws: kvm: double the size of hv_clock_boot" It looks like we can replace this workaround with a proper fix, by applying this patch: https://lore.kernel.org/kvm/87sg4t7vqy....@vitty.brq.redhat.com/T/#m7533e1d1e551bff425da029fd401bd87935edc33 [Test plan] Create a c5.18xlarge instance, run the memory stress test script (the same test script that we are using to stress test hibernation), trigger the hibernate event, trigger the resume event. Repeat a couple of times and the problem is very likely to happen. [Fix] https://lore.kernel.org/kvm/87sg4t7vqy....@vitty.brq.redhat.com/T/#m7533e1d1e551bff425da029fd401bd87935edc33 The fix has been tested extensively in the AWS infrastructure with positive results. [Regression potential] This new code introduced by the fix can be executed also when a CPU is put offline, so we may see potential regressions in the KVM CPU hotplugging. ** Affects: linux-aws (Ubuntu) Importance: Undecided Status: New ** Affects: linux-aws (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: linux-aws (Ubuntu Focal) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-aws in Ubuntu. https://bugs.launchpad.net/bugs/1920944 Title: aws: proper fix for c5.18xlarge hibernation issues Status in linux-aws package in Ubuntu: New Status in linux-aws source package in Focal: New Bug description: [Impact] In LP: #1918694 we applied a fix and a workaround to solve the hibernation issues on c5.18xlarge. The workaround was in the form of a SAUCE patch: "UBUNTU: SAUCE: aws: kvm: double the size of hv_clock_boot" It looks like we can replace this workaround with a proper fix, by applying this patch: https://lore.kernel.org/kvm/87sg4t7vqy....@vitty.brq.redhat.com/T/#m7533e1d1e551bff425da029fd401bd87935edc33 [Test plan] Create a c5.18xlarge instance, run the memory stress test script (the same test script that we are using to stress test hibernation), trigger the hibernate event, trigger the resume event. Repeat a couple of times and the problem is very likely to happen. [Fix] https://lore.kernel.org/kvm/87sg4t7vqy....@vitty.brq.redhat.com/T/#m7533e1d1e551bff425da029fd401bd87935edc33 The fix has been tested extensively in the AWS infrastructure with positive results. [Regression potential] This new code introduced by the fix can be executed also when a CPU is put offline, so we may see potential regressions in the KVM CPU hotplugging. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/1920944/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
