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    Live migrate of Rocky Linux 8.8 VM crashes/reboots VM

    Scheduled Pinned Locked Moved Solved Compute
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    • W Offline
      Weppel @stormi
      last edited by

      @stormi Thanks for noticing, my bad

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      • stormiS Offline
        stormi Vates 🪐 XCP-ng Team
        last edited by

        Adding @bleader to the discussion. He's trying to debug the issue.

        It looks like a simple VM suspend + resume also crashes the VM. Do you confirm, @Weppel?

        W 1 Reply Last reply Reply Quote 0
        • W Offline
          Weppel @stormi
          last edited by

          @stormi Confirmed

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          • bleaderB Offline
            bleader Vates 🪐 XCP-ng Team
            last edited by

            So, after our investigations, we were able to pinpoint the issue.

            It seem to happen on most RHEL derivative distributions when migrating from 8.7 to 8.8. As suggested, the bug is in the kernel.

            Starting with 4.18.0-466.el8 the patch: x86/idt: Annotate alloc_intr_gate() with __init is integrated and will create the issue. It is missing x86/xen: Split HVM vector callback setup and interrupt gate allocation that should have been integrated as well.

            The migration to 8.8 will move you to 4.18.0-477.* versions that are also raising this issue, that's what you reported.

            We found that the 4.18.0-488 that can be found in CentOS 8 Stream integrates the missing patch, and do indeed work when installed manually.

            Your report helped us identify and reproduce the issues. That allowed us to provide a callstack to Xen devs. Then Roger Pau Monné found that it was this patch missing quickly, and we were able to find which versions of the kernel RPMs were integrating it and when the fix was integrated.

            This means the issue was identified on RH side, and it is now a matter of having an updated kernel in derivative distributions like Rocky and Alma.

            W 1 Reply Last reply Reply Quote 3
            • W Offline
              Weppel @bleader
              last edited by

              @bleader Thank you very much for the quick discovery of this, impressive work! I'm glad I could help!

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              • olivierlambertO olivierlambert marked this topic as a question on
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              • W Offline
                Weppel
                last edited by

                FYI this is not fixed yet in the latest EL kernel 4.18.0-477.15.1.el8_8.x86_64

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                • olivierlambertO Offline
                  olivierlambert Vates 🪐 Co-Founder CEO
                  last edited by

                  Thanks for keeping us posted…

                  Hopefully things will be fixed at some point. Maybe Red Hat is focused on doing other things right now…

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                  • bleaderB Offline
                    bleader Vates 🪐 XCP-ng Team
                    last edited by

                    Makes sense, I was hoping they would go with a -488 on update... Sorry to hear its not the case 😞

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                    • Q Offline
                      qnx @bleader
                      last edited by

                      @bleader Unfortunately, I think we're stuck on -477 until EL 8.9 comes out 😕

                      it's frustrating that it's taking them so long to fix this, especially when it seems like the bug was caused by a human error to begin with.

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                      • bleaderB Offline
                        bleader Vates 🪐 XCP-ng Team
                        last edited by

                        Not entirely sure, but that may be related to what's happening on redhat side of things 😕

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                        • K Offline
                          KFC-Netearth
                          last edited by

                          Just installed the latest kernel from Rocky and a live migrate seems to work on the 2 dev servers I have tried so far :
                          4.18.0-477.21.1.el8_8.x86_64 #1 SMP Tue Aug 8 21:30:09 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

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                          • bleaderB Offline
                            bleader Vates 🪐 XCP-ng Team @KFC-Netearth
                            last edited by

                            @KFC-Netearth Surprising as it is still .477 but maybe the patch was backported, thanks for telling us!

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                            • W Offline
                              Weppel @KFC-Netearth
                              last edited by

                              @KFC-Netearth

                              The Rocky Linux bugtracker indeed mentions it's mostly fixed, but there are still some kernel errors present: https://bugs.rockylinux.org/view.php?id=3565#c4293

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