LVM2 lvcreate multi snapshots and dm-devel patches

Thank you very much Alasdair :-)

With reference to your messege:
https://www.redhat.com/archives/linux-lvm/2005-October/msg00007.html

"... some LVM2 snapshot operations are incomplete or hang and need prodding or finishing with dmsetup (eg with a dmsetup resume or remove). This is because the order LVM2 does some operations needs to be changed."

when and how exactly (in detail) should i use dmsetup suspend/resume under lvcreate/ lvremove snapshot of lvm2 lgocal volume (especially XFS lv)?

Regards Hubert.