We also see this problem while we do not use any iscsi, it's always triggered when a vm config is changed or created:
Mar 18 19:15:20 pve1 systemd-modules-load[32221]: Inserted module 'iscsi_tcp'
Mar 18 19:15:20 pve1 kernel: [ 0.000000] Linux version 5.0.21-2-pve (build@pve) (gcc version...