[libvirt-users] libvirt failed to respond after quite a few vnet bridges were created

During concurrent 80 VM creation, each VM takes two network connections, libvirtd failed to respond. Neither restart libvirtd nor restart CIMOM helped. There were 152 vnet bridges found on this RHEL KVM host. After all the vnet bridges were manually removed, libvirtd responded normally again. Is there a known issue about the number limit of vnet bridges regarding libvirtd? Thank you. --Yih