Redhat 8 boot stuck at "started cancel waiting for multipath siblings of sda"

In packer, I try to build an redhat 8 image VHDx with packer but at OS boot after grub commands, I am stuck at “started cancel waiting for multipath siblings of sda” level.

Here is the boot command :

boot_command=“c setparams ‘kickstart’ linuxefi /images/pxeboot/vmlinuz inst.stage2=hd:LABEL=RHEL-8-5-0-BaseO ip=169.254.211.150 netmask=255.255.255.0 inst.ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/gen2-rhel/ks_rhel8.cfg ignoredisk initrdefi /images/pxeboot/initrd.img boot”

the ks_rhel8.cfg kikstart file is not event started.

the message “started cancel waiting for multipath siblings of sda” is displayed twice, the first one after “[sda] attach SCSI disk”, but it goes trough OK, and then a second time and then it’s stuck.

Do anyone has this problem ? thanks in advance