Bug 1028927

Summary: guest agent commands will hang if the guest agent crashes while executing a command
Product: Red Hat Enterprise Linux 7 Reporter: zhenfeng wang <zhwang>
Component: libvirtAssignee: Michal Privoznik <mprivozn>
Status: CLOSED DUPLICATE QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: urgent    
Version: 7.0CC: acathrow, cwei, dyuan, gsun, jiahu, mprivozn, mzhan, pkrempa, shyu
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 890648 Environment:
Last Closed: 2014-05-29 13:55:02 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:
Bug Depends On: 890648, 1080376    
Bug Blocks:    

Comment 1 zhenfeng wang 2013-11-11 10:02:41 UTC 
The virsh command will hang there while we do S3 with guest as the following order
dompmsuspend=>dompmwakeup=>save=>restore=>dompmsuspend(the virsh command will hang here)

pkg info
kernel-3.10.0-47.el7.x86_64
qemu-kvm-rhev-1.5.3-14.el7.x86_64
libvirt-1.1.1-12.el7.x86_6

steps
1.# getenforce
Enforcing

2.Prepare a guest with qemu-ga ENV
# virsh list --all
 Id    Name                           State
----------------------------------------------------
 7     rhel7                       running

3.Start the qemu-ga service in guest
# systemctl start qemu-guest-agent.service

4.Do s3 with the guest,then wakeup it,however,the guest can't back to the previous status before pmsuspend
#virsh dompmsuspend rhel7 --target mem

#virsh dompmwakeup rhel7

5.Save and restore the guest
# virsh save rhel7 /tmp/rhel7.save

#virsh restore /tmp/rhel7.save

6.Do s3 with the guest again, the virsh command will hang here
#virsh dompmsuspend rhel7 --target mem
^C
# virsh save rhel7 /tmp/rhel7.save 
error: Failed to save domain rhel7 to /tmp/rhel7.save
error: Timed out during operation: cannot acquire state change lock
Comment 2 hyao@redhat.com 2013-12-31 07:06:07 UTC 
Reproduced the bug  on the following packages according to the steps in comment1:
# rpm -qa libvirt qemu-kvm-rhev
libvirt-1.1.1-16.el7.x86_64
qemu-kvm-rhev-1.5.3-30.el7.x86_64