Public bug reported:
Per report raised at https://bugzilla.redhat.com/show_bug.cgi?id=1790093
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:
qemu-kvm-ev-2.12.0-33.1.el7_7.4.x86_64
qemu-kvm-2.12.0-65.module_el8.0.0+189+f9babebb.5.x86_64
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.
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1859418
Title:
disk driver with iothread setting hangs live migrations
Status in QEMU:
New
Bug description:
Per report raised at
https://bugzilla.redhat.com/show_bug.cgi?id=1790093
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:
qemu-kvm-ev-2.12.0-33.1.el7_7.4.x86_64
qemu-kvm-2.12.0-65.module_el8.0.0+189+f9babebb.5.x86_64
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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