Hello Again, thank you for your respons, i have plan to test different kernel, and i will post the apport-collect result very soon.
meanwhile, i can confirm some new informations : i re-installed the two system into ubuntu 22.04.1, (kernel 5.15.0-60-generic) with this, i reproduce the problem every time. i downgraded the kernel to 4.15.0-204 on both systems, without changing anything else , and then the problem is gone, i have done dozens of virsh migrate without any issue. i guess this confirm the kernel issue. i will come back soon with apport-collect result and more kernel tests. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2003226 Title: libvirt live migrate to a lower generation processor freeze the migrated vm Status in libvirt package in Ubuntu: Incomplete Status in linux package in Ubuntu: Incomplete Bug description: Hi, i have several libvirt hosts servers with differents CPU generation, in particular : - older generation : Intel Xeon E5-2640 v4 2.40GHz - newer generation : Intel Xeon Gold 5215 2.50GHz i recently re-install all this servers into ubuntu server 22.04.1 and since, when i live migrate a VM from a new generation processor to older generation processor the migrated guest freeze without generating any error logs. if i migrate the opposite way ( older cpu to newer cpu ) it works perfectly. previous version of hosts ( same hardware on ubuntu 16.04 ) did not present the problem the live migration is done with the following command ( issued from a third server playing the role of 'virtual-center' ) : virsh -c qemu+ssh://root@new_server/system migrate --verbose --live --undefinesource --persistent --unsafe guest_name qemu+ssh://root@old_server/system this one freeze the guest while the opposite migration : virsh -c qemu+ssh://root@old_server/system migrate --verbose --live --undefinesource --persistent --unsafe guest_name qemu+ssh://root@new_server/system works without problem migrate between 2 servers with same generation CPU also works perfectly the cpu configuration of guest is generic : <cpu mode='custom' match='exact' check='full'> <model fallback='forbid'>qemu64</model> <feature policy='require' name='x2apic'/> <feature policy='require' name='hypervisor'/> <feature policy='require' name='lahf_lm'/> <feature policy='disable' name='svm'/> </cpu> i have tried several ( almost all ) other virtual cpu configuration , always with the same problem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/2003226/+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
