[slurm-users] Jobs of a user are stuck in Completing stage for a long time and cannot cancel them

We are running a slurm cluster with version `slurm 22.05.8`. One of our users has reported that their jobs have been stuck at the completion stage for a long time. Referring to Slurm Workload Manager - Slurm Troubleshooting Guide we found that indeed the batchhost for the job was removed from the cluster, perhaps without draining it first.

How do we cancel/delete the jobs ?

* We tried scancel on the batch and individual job ids from both the user and from SlurmUser