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[Bug 1859418] Re: disk driver with iothread setting hangs live migration

From: Launchpad Bug Tracker
Subject: [Bug 1859418] Re: disk driver with iothread setting hangs live migrations
Date: Wed, 18 Mar 2020 04:17:18 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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  disk driver with iothread setting hangs live migrations

Status in QEMU:

Bug description:
  Per report raised at

  Description of problem:

  A disk driver definition using iothread parameter causes live
  migration with copy storage to hang during or just before the final
  ram sync stage.

  Interestingly, having the scsi controller as a separate iothread does
  not trigger the issue.

  Version-Release number of selected component (if applicable):

  I can reproduce this on centos7 with qemu-ev and with centos 8:


  Steps to Reproduce:
  1. Create a definition with 1 iothread on the disk image:

        <driver name='qemu' type='qcow2' iothread='1' />

  2. Issue a live migrate request like: virsh migrate --live --copy-storage-all 
vm qemu+tcp://remote/system
  3. Live migrate on source copies storage and then hangs at 80-99%, I guess 
during the ram copy phase.

  Keeping exactly the same config but without the iothread on the disk
  driver has successful migrations every time.

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