The node's volumes allocatable count is 127 on GCP . When created a pod consumed 127 PVC ,it took long time to operate volumeMount. Delete pod is quick ,but some volumeAttachment is still exist after several hours though the reclaimPolicy is delete.

openshift 4.12

Random

1.Deploy a cluster on GCP with version 4.12
2.Create pvc 0-127 (mulpvc.yaml) and a pod consumed these pvcs (podWithMulPVC.json)
https://drive.google.com/file/d/1-18aMACU3PF_dCBh7LLnCPuWqx8nLfGg/view?usp=sharing, https://drive.google.com/file/d/1cvyD9KFjwXDLuW5ituWMGDfw--iI9AxG/view?usp=sharing
3.Delete the pod. If lucky ,it takes about 7 minutes to detach all the pvcs. If sth happened, some pvcs will be "failed to datached" and the pvs' status will be "Released" for several hours. 

Some volumeAttachment is still exist after pod is deleted several hours.

VolumeAttachment is cleaned up