upgrade fail with error: unlinkat /var/lib/influxdb2: device or resource busy

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Hi all,
When we upgrading influxDB from 1.7 to 2.0 by using InfluxDB v2 Helm chart with old data mounted, statefulsets deployed successful but the container in status of unready with Pod log below, could someone can help on this ? thank you in advance.

`Error: couldn't delete existing file at "/var/lib/influxdb2": unlinkat /var/lib/influxdb2: device or resource busy
See 'influxd -h' for help
2021-09-07T09:24:25. warn cleaning bolt and engine files to prevent conflicts on retry {"system": "docker", "bolt_path": "/var/lib/influxdb2/influxd.bolt", "engine_path": "/var/lib/influxdb2"}
rm: can't remove '/var/lib/influxdb2': Resource busy`

Start with the InfluxDB v2 Helm chart upgrade and the pod log showing unlinkat failure on the mounted /var/lib/influxdb2 path. Compare the old data mount with the StatefulSet and container configuration; done means identifying a confirmed upgrade or mount configuration that lets the container become ready.

Written by the indexing model from the issue text.