etcd is showing "failed to lock file [..] fileutil: file already locked" warnings

Issue

• On OpenShift Container Platform, the etcd Pod is showing messages like the following:

  2023-06-19T09:10:30.817918145Z {"level":"warn","ts":"2023-06-19T09:10:30.817Z","caller":"fileutil/purge.go:72","msg":"failed to lock file","path":"/var/lib/etcd/member/wal/000000000000bc4b-00000000183620a4.wal","error":"fileutil: file already locked"}
  2023-06-19T09:11:00.818937158Z {"level":"warn","ts":"2023-06-19T09:11:00.818Z","caller":"fileutil/purge.go:72","msg":"failed to lock file","path":"/var/lib/etcd/member/wal/000000000000bc4b-00000000183620a4.wal","error":"fileutil: file already locked"}
  

• These messages may also be shown during or after an OpenShift Container Platform upgrade.