Comment 5 for bug 1789659

I have just verified that the reproducer for Red Hat Enterprise Linux is valid for Bionic:

1.Start a guest:
$ virsh start test1

2.Do 'virsh list' in a loop:
$ for i in {1..1000}; do virsh list; done

3.Open another terminal, do 'virsh domstats' in a loop:
$ for i in {1..1000}; do virsh domstats; done

4.Check the libvirtd.log:
$ cat /var/log/libvirt/libvirtd.log | grep -i "Hash operation not allowed during"
2018-09-04 06:57:00.761+0000: 28687: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-09-04 06:57:00.773+0000: 28684: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-09-04 06:57:02.040+0000: 28687: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-09-04 06:57:06.567+0000: 28687: error : virHashForEach:597 : Hash operation not allowed during iteration
2018-09-04 06:57:09.761+0000: 28684: error : virHashForEach:597 : Hash operation not allowed during iteration

https://bugzilla.redhat.com/show_bug.cgi?id=1581364#c7

With the aforementioned patch, this error is not produced any more.