libvirt segfaults with "internal,error: Missing monitor reply object", during block live-migration

[Peter Krempa]

On Thu, Jul 30, 2020 at 16:13:09 +0200, Alex Walender wrote:
> Dear libvirt community,
> 
> 
> Using recent Ubuntu Stein Cloud Packages, we are observing random
> libvirtd live-migration crashes on the target host.
> Libvirt is having a SEGFAULT with 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.I can reproduce this with large VMs, which have a large memory pool.

Could you please also attach the backtrace of the libvirtd process once
it crashes? That would be helpful.