apport information

** Attachment added: "Lspci.txt"
   https://bugs.launchpad.net/bugs/2003226/+attachment/5647833/+files/Lspci.txt

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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.
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 févr. 16 12:39 seq
   crw-rw---- 1 root audio 116, 33 févr. 16 12:39 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.11-0ubuntu82.3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  CasperMD5CheckResult: pass
  DistroRelease: Ubuntu 22.04
  InstallationDate: Installed on 2023-02-15 (0 days ago)
  InstallationMedia: Ubuntu-Server 22.04.1 LTS "Jammy Jellyfish" - Release 
amd64 (20220809)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: FUJITSU PRIMERGY RX2530 M2
  Package: linux (not installed)
  PciMultimedia:
   
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-5.15.0-60-generic 
root=UUID=13e84e97-ad18-49ed-8050-c8f7293e5e7d ro
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 mgag200drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-60-generic 
root=UUID=13e84e97-ad18-49ed-8050-c8f7293e5e7d ro
  ProcVersionSignature: Ubuntu 5.15.0-60.66-generic 5.15.78
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-60-generic N/A
   linux-backports-modules-5.15.0-60-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.10
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  Tags:  jammy
  Uname: Linux 5.15.0-60-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  _MarkForUpload: True
  dmi.bios.date: 09/29/2016
  dmi.bios.release: 1.10
  dmi.bios.vendor: FUJITSU // American Megatrends Inc.
  dmi.bios.version: V5.0.0.11 R1.10.0 for D3279-B1x
  dmi.board.name: D3279-B1
  dmi.board.vendor: FUJITSU
  dmi.board.version: S26361-D3279-B12 WGS03 GS02
  dmi.chassis.asset.tag: System Asset Tag
  dmi.chassis.type: 23
  dmi.chassis.vendor: FUJITSU
  dmi.chassis.version: RX2530M2R1
  dmi.modalias: 
dmi:bvnFUJITSU//AmericanMegatrendsInc.:bvrV5.0.0.11R1.10.0forD3279-B1x:bd09/29/2016:br1.10:svnFUJITSU:pnPRIMERGYRX2530M2:pvrGS01:rvnFUJITSU:rnD3279-B1:rvrS26361-D3279-B12WGS03GS02:cvnFUJITSU:ct23:cvrRX2530M2R1:skuABNK1565-V101-236:
  dmi.product.family: SERVER
  dmi.product.name: PRIMERGY RX2530 M2
  dmi.product.sku: ABN:K1565-V101-236
  dmi.product.version: GS01
  dmi.sys.vendor: FUJITSU
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 févr. 16 12:39 seq
   crw-rw---- 1 root audio 116, 33 févr. 16 12:39 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.11-0ubuntu82.3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  CasperMD5CheckResult: pass
  DistroRelease: Ubuntu 22.04
  InstallationDate: Installed on 2023-02-15 (0 days ago)
  InstallationMedia: Ubuntu-Server 22.04.1 LTS "Jammy Jellyfish" - Release 
amd64 (20220809)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 04b3:4010 IBM Corp. XClarity Controller
   Bus 001 Device 002: ID 2a4b:0400 EMULEX Corporation Pilot4 Integrated Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Lsusb-t:
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 5000M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
       |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/7p, 480M
           |__ Port 6: Dev 4, If 0, Class=Communications, Driver=cdc_ether, 480M
           |__ Port 6: Dev 4, If 1, Class=CDC Data, Driver=cdc_ether, 480M
  MachineType: Lenovo ThinkSystem SR530 -[7X08CTO1WW]-
  Package: linux (not installed)
  PciMultimedia:
   
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-5.15.0-60-generic 
root=UUID=fc2c50fd-cc47-4243-918d-75af7d00b0e4 ro
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 mgag200drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-60-generic 
root=UUID=fc2c50fd-cc47-4243-918d-75af7d00b0e4 ro
  ProcVersionSignature: Ubuntu 5.15.0-60.66-generic 5.15.78
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-60-generic N/A
   linux-backports-modules-5.15.0-60-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.10
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  Tags:  jammy
  Uname: Linux 5.15.0-60-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  _MarkForUpload: True
  dmi.bios.date: 10/31/2019
  dmi.bios.release: 2.41
  dmi.bios.vendor: Lenovo
  dmi.bios.version: -[TEE148M-2.41]-
  dmi.board.asset.tag: none
  dmi.board.name: -[7X08CTO1WW]-
  dmi.board.vendor: Lenovo
  dmi.board.version: none
  dmi.chassis.asset.tag: none
  dmi.chassis.type: 23
  dmi.chassis.vendor: Lenovo
  dmi.chassis.version: none
  dmi.ec.firmware.release: 3.8
  dmi.modalias: 
dmi:bvnLenovo:bvr-[TEE148M-2.41]-:bd10/31/2019:br2.41:efr3.8:svnLenovo:pnThinkSystemSR530-[7X08CTO1WW]-:pvr08:rvnLenovo:rn-[7X08CTO1WW]-:rvrnone:cvnLenovo:ct23:cvrnone:sku7X08CTO1WW:
  dmi.product.family: ThinkSystem
  dmi.product.name: ThinkSystem SR530 -[7X08CTO1WW]-
  dmi.product.sku: 7X08CTO1WW
  dmi.product.version: 08
  dmi.sys.vendor: Lenovo

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