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[Balazs Gibizer <1889213@xxxxxxxxxxxxxxxxxx>]

Based on the logs I don't think this is a nova bug. I suggest to contact
the libvirt developers at https://libvirt.org/bugs.html

I'm setting this as Invalid if further investigation on the libvirt side
indicates that somehow nova causes the libvirt segfault then feel free
to set this bugreport back to New.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1889213

Title:
  libvirt: live-migration crash with segfault while transfering memstate

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========

  Using recent Ubuntu Stein Cloud Packages, we are observing random
  live-migration crashes on the target host. Libvirt is having a
  SEGFAULT on the qemu driver. Transferring block devices usually works
  without issues. However, the following memory transfer is causing the
  target libvirtd randomly to close down its socket, resulting in a
  roll-backed migration process.

  Libvirt log on target host before the crash is attached.

  
  Steps to reproduce
  ==================

  - Start a live-migration with block mode between 2 identical hosts.
  - Wait until transfer of blockdisks is done
  - During memory transfer, target host libvirt crashes.

  Expected result
  ===============

  Live-Migration completes onto the new host as intended.

  Actual result
  =============

  Target host libvirtd crashes with SEGFAULT, causing a rollback of the
  migration.

  Environment
  ===========

  Ubuntu 18.04.4 LTS (GNU/Linux 4.15.0-99-generic x86_64)
  OpenStack Stein (Ubuntu Cloud Archive)
  Libvirt+QEMU_x86

  keystone-common 2:15.0.1-0ubuntu1~cloud0
  libvirt-daemon 5.0.0-1ubuntu2.6~cloud0
  qemu-system-x86 1:3.1+dfsg-2ubuntu3.7~cloud0
  neutron-linuxbridge-agent 2:14.2.0-0ubuntu1~cloud0
  neutron-plugin-ml2 2:14.2.0-0ubuntu1~cloud0
  nova-compute 2:19.2.0-0ubuntu1~cloud0
  nova-compute-libvirt 2:19.2.0-0ubuntu1~cloud0
  python-rbd 14.2.10-1bionic
  python3-cinderclient 1:4.1.0-0ubuntu1~cloud0
  python3-designateclient 2.9.0-0ubuntu1
  python3-glanceclient 1:2.16.0-0ubuntu1~cloud0
  python3-neutronclient 1:6.11.0-0ubuntu1~cloud0
  python3-novaclient 2:13.0.0-0ubuntu1~cloud0

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