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

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