Bug 2236353

Summary:	qemu crashed when migrate guest with blob resources enabled
Product:	Red Hat Enterprise Linux 9	Reporter:	Lili Zhu <lizhu>
Component:	qemu-kvm	Assignee:	Marc-Andre Lureau <marcandre.lureau>
qemu-kvm sub component:	Graphics	QA Contact:	Guo, Zhiyi <zhguo>
Status:	CLOSED MIGRATED	Docs Contact:
Severity:	unspecified
Priority:	unspecified	CC:	coli, fjin, jinzhao, juzhang, kraxel, lmen, virt-maint, xuzhang, zhetang
Version:	9.4	Keywords:	MigratedToJIRA
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-09-22 18:15:41 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Lili Zhu 2023-08-31 03:21:48 UTC

Description of problem:
qemu crashed when migrate guest with blob resources enabled


Version-Release number of selected component (if applicable):
libvirt-9.5.0-6.el9.x86_64
qemu-kvm-8.0.0-13.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. prepare a guest with the following xml snippet
# virsh dumpxml lizhu --xpath //video
<video>
  <model type="virtio" heads="1" primary="yes" blob="on"/>
  <alias name="video0"/>
  <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x0"/>
</video>

2. migrate the guest to another host
# virsh migrate lizhu qemu+ssh://$target_host/system --verbose --live
Migration: [98.32 %]error: operation failed: domain is not running

3. check the qemu log on target host
#cat /var/log/libvirt/qemu/lizhu.log
...
2023-08-30 14:35:30.653+0000: Domain id=1 is tainted: host-cpu
char device redirected to /dev/pts/2 (label charserial0)
2023-08-30T14:35:37.352236Z qemu-kvm: Failed to load virtio-gpu:virtio-gpu
2023-08-30T14:35:37.352266Z qemu-kvm: error while loading state for
instance 0x0 of device '0000:00:01.0/virtio-gpu'
2023-08-30T14:35:37.352442Z qemu-kvm: load of migration failed: Invalid argument
2023-08-30 14:35:37.754+0000: shutting down, reason=crashed

4. check the qemu log on source host
#cat /var/log/libvirt/qemu/lizhu.log
...
2023-08-30 14:35:30.974+0000: initiating migration
2023-08-30 14:35:37.789+0000: shutting down, reason=crashed

5. check the guest states on source host
# virsh domstate lizhu --reason
shut off (unknown)

Actual results:
Migration failed, qemu crashed

Expected results:
Qemu should not crash.

Comment 1 Guo, Zhiyi 2023-09-06 11:22:59 UTC

I think live migration should be blocked if blob is enabled

Comment 2 Marc-Andre Lureau 2023-09-06 13:09:28 UTC

I sent a patch to the ML: "[PATCH] virtio-gpu: block migration of VMs with blob=true"

we will need future work to allow migration.

Comment 3 RHEL Program Management 2023-09-22 18:10:39 UTC

Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.

Comment 4 RHEL Program Management 2023-09-22 18:15:41 UTC

This BZ has been automatically migrated to the issues.redhat.com Red Hat Issue Tracker. All future work related to this report will be managed there.

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