The specified host network address already exists

I'm using Dell CSI Unity driver with OKD 4 to provide storage via iSCSI and NFS. We are also using a Machine Config Operator so that cluster nodes can be provisioned, added, and removed easily. So far, this has worked OK and the new nodes get CSI unity-node pods scheduled on them.

Today we ran into a case where an IP address belonging to an old node was reused by a new node, and this has resulted in errors when the unity-node pod starts on that node.

The relevant log lines seem to be:

time="2021-07-13T13:47:37Z" level=debug arrayid=ckm00201700161 runid=node-332 msg="Error in response. Method:POST URI:/api/types/hostIPPort/instances Error: [{The specified host network address already exists. (Error Code:0x60000f2)}] JSON Error: [{The specified host network address already exists. (Error Code:0x60000f2)}]" func="github.com/dell/gounity.(*Client).executeWithRetryAuthenticate()" file="dell/gounity/unityclient.go:113"
time="2021-07-13T13:47:37Z" level=error arrayid=ckm00201700161 runid=node-332 msg="failed to invoke Unity REST API server" func="github.com/dell/gounity.(*Client).executeWithRetryAuthenticate()" file="dell/gounity/unityclient.go:127"
time="2021-07-13T13:47:37Z" level=debug arrayid=ckm00201700161 runid=node-332 msg="Adding node [ckm00201700161] failed, Error: [[{The specified host network address already exists. (Error Code:0x60000f2)}]]" func="github.com/dell/csi-unity/service.(*service).syncNodeInfo.func2.1()" file="/go/src/csi-unity/service/node.go:1661"
handleServer method: /csi.v1.Identity/GetPluginInfo
time="2021-07-13T13:52:34Z" level=debug msg="/csi.v1.Identity/GetPluginInfo: REQ 0649: XXX_NoUnkeyedLiteral={}, XXX_sizecache=0"
time="2021-07-13T13:52:34Z" level=debug msg="/csi.v1.Identity/GetPluginInfo: REP 0649: Name=csi-unity.dellemc.com, VendorVersion=1.5.0, Manifest=map[commit:823c1cb2fd696e996b7ad71b6dfc7e666a203ae8 formed:Mon, 22 Mar 2021 10:42:01 UTC semver:1.5.0 url:http://github.com/dell/csi-unity], XXX_NoUnkeyedLiteral={}, XXX_sizecache=0"
handleServer method: /csi.v1.Node/NodeGetInfo
time="2021-07-13T13:52:36Z" level=debug msg="/csi.v1.Node/NodeGetInfo: REQ 0650: XXX_NoUnkeyedLiteral={}, XXX_sizecache=0"
time="2021-07-13T13:52:36Z" level=debug  runid=650 msg="Executing NodeGetInfo with args: {XXX_NoUnkeyedLiteral:{} XXX_unrecognized:[] XXX_sizecache:0}" func="github.com/dell/csi-unity/service.(*service).NodeGetInfo()" file="/go/src/csi-unity/service/node.go:778"
time="2021-07-13T13:52:39Z" level=debug msg="/csi.v1.Node/NodeGetInfo: REP 0650: rpc error: code = Unavailable desc =  runid=650 The node [storage-test-lr78j-worker-f61c10-4w52w] is not added to any of the arrays"