Concurrent host-assisted clone from one source PVC causing the source pod restarts (both same-namespace and cross-namespace).

In my case, it was  HPP to HPP clone on different environments - BM, PSI.

4.16, 4.15, 4.14, haven't tried earlier versions

Always for concurrent clone

1. Cretae several (2-5 will work) DVs that clone one PVC

[cloud-user@ocp-psi-executor-xl scripts]$ cat multiple-dv-clones.sh 
#!/bin/bash

set -ex

for i in {1..5}
do
   echo "Clone $i times"
   cat > dv-target-num.yaml << 'EOL'
apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata: 
  name: mydv
  annotations:
    cdi.kubevirt.io/storage.bind.immediate.requested: 'true'
spec:
  sourceRef:
    kind: DataSource
    name: rhel8
    namespace: openshift-virtualization-os-images
  storage:
    resources:
      requests:
        storage: 30Gi
    storageClassName: hostpath-csi-basic
EOL  
   sed -i "s/mydv/dv$i/g" dv-target-num.yaml 
   oc create -f dv-target-num.yaml
done

oc get dv

Target DV has restarts:

$ oc get dv
NAME   PHASE       PROGRESS   RESTARTS   AGE
dv1    Succeeded   100.0%     1          12m
dv2    Succeeded   100.0%     3          12m
dv3    Succeeded   100.0%     4          12m
dv4    Succeeded   100.0%     2          12m
dv5    Succeeded   100.0%     5          12m

$ oc logs -n openshift-virtualization-os-images d70713d3-cd74-43ba-a1dd-24cd43feb9d8-source-pod -p
VOLUME_MODE=filesystem
MOUNT_POINT=/var/run/cdi/clone/source
/var/run/cdi/clone/source /
UPLOAD_BYTES=32212254742
I0617 12:14:33.426324      10 clone-source.go:220] content-type is "filesystem-clone"
I0617 12:14:33.426423      10 clone-source.go:221] mount is "/var/run/cdi/clone/source"
I0617 12:14:33.426427      10 clone-source.go:222] upload-bytes is 32212254742
I0617 12:14:33.426444      10 clone-source.go:239] Starting cloner target
I0617 12:14:33.426493      10 clone-source.go:177] Executing [/usr/bin/tar cv -S disk.img]
I0617 12:14:34.251916      10 clone-source.go:251] Set header to filesystem-clone
I0617 12:14:34.435639      10 prometheus.go:75] 0.01
I0617 12:14:35.439591      10 prometheus.go:75] 0.27
I0617 12:14:36.439882      10 prometheus.go:75] 0.48
I0617 12:14:37.441110      10 prometheus.go:75] 0.69
I0617 12:14:38.441187      10 prometheus.go:75] 0.94
I0617 12:14:39.442607      10 prometheus.go:75] 1.18
I0617 12:14:40.442678      10 prometheus.go:75] 1.45
I0617 12:14:41.443432      10 prometheus.go:75] 1.68
I0617 12:14:42.443516      10 prometheus.go:75] 1.93
I0617 12:14:43.445281      10 prometheus.go:75] 2.10
I0617 12:14:44.445685      10 prometheus.go:75] 2.29
I0617 12:14:45.447510      10 prometheus.go:75] 2.49
I0617 12:14:46.447596      10 prometheus.go:75] 2.73
I0617 12:14:47.447764      10 prometheus.go:75] 2.97
I0617 12:14:48.447835      10 prometheus.go:75] 3.24
I0617 12:14:49.450823      10 prometheus.go:75] 3.50
I0617 12:14:50.451068      10 prometheus.go:75] 3.76
I0617 12:14:51.451145      10 prometheus.go:75] 3.94
I0617 12:14:52.454302      10 prometheus.go:75] 4.12
I0617 12:14:53.454610      10 prometheus.go:75] 4.38
I0617 12:14:54.458346      10 prometheus.go:75] 4.60
I0617 12:14:55.459023      10 prometheus.go:75] 4.87
I0617 12:14:56.459297      10 prometheus.go:75] 5.09
I0617 12:14:57.459990      10 prometheus.go:75] 5.35
I0617 12:14:58.460545      10 prometheus.go:75] 5.56
I0617 12:14:59.460626      10 prometheus.go:75] 5.77
I0617 12:15:00.476080      10 prometheus.go:75] 5.89
I0617 12:15:01.476492      10 prometheus.go:75] 6.09
I0617 12:15:02.476930      10 prometheus.go:75] 6.30
I0617 12:15:03.484323      10 prometheus.go:75] 6.54
I0617 12:15:04.484413      10 prometheus.go:75] 6.76
I0617 12:15:05.488516      10 prometheus.go:75] 6.95
F0617 12:15:05.777666      10 clone-source.go:41] Subprocess did not execute successfully, result is: '\x01'
disk.img
/usr/bin/tar: disk.img: file changed as we read it 

No restarts for concurrent clone