Bug 1301860

Summary:	vCPU offline hang in real-time guest
Product:	Red Hat Enterprise Linux 7	Reporter:	Peter Xu <peterx>
Component:	qemu-kvm-rhev	Assignee:	Peter Xu <peterx>
Status:	CLOSED NOTABUG	QA Contact:	Pei Zhang <pezhang>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3	CC:	daolivei, hhuang, huding, juzhang, michen, pagupta, peterx, pezhang, virt-maint, xfu
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:	2017-10-11 04:42:46 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:

Comment 3 Daniel Bristot de Oliveira 2016-02-03 19:34:47 UTC

Hi Peter,

There are some known hotplug issues on kernel-rt. For an example, see BZ1267425.

On this BZ I was able to identify the root cause by inspecting a
vmcore, and on these cases, the vmcore is the best tool to understand
why the system hanged.

Can you please capture a vmcore of the VM after it hangs on hotplug
operations?

Here is a document from support explaining how to capture a vmcore of a VM:

https://access.redhat.com/solutions/39604

We will also need the debuginfo packages of the kernel that was running
on the VM.

Comment 6 Pei Zhang 2017-10-11 04:04:13 UTC

Peter, this issue has gone with rhel7.5. 


After online/offline 100 times using script in Description, both host and guest work well, not any error.

Versions:
3.10.0-730.rt56.658.el7.x86_64
qemu-kvm-rhev-2.10.0-1.el7.x86_64
libvirt-3.7.0-2.el7.x86_64
tuned-2.8.0-5.el7.noarch


Best Regards,
Pei

Comment 7 Peter Xu 2017-10-11 04:42:46 UTC

(In reply to Pei Zhang from comment #6)
> Peter, this issue has gone with rhel7.5. 
> 
> 
> After online/offline 100 times using script in Description, both host and
> guest work well, not any error.
> 
> Versions:
> 3.10.0-730.rt56.658.el7.x86_64
> qemu-kvm-rhev-2.10.0-1.el7.x86_64
> libvirt-3.7.0-2.el7.x86_64
> tuned-2.8.0-5.el7.noarch
> 
> 
> Best Regards,
> Pei

Thanks Pei!  Then I'm closing the bug.

Peter