Patch 1 was previously posted here:
https://www.redhat.com/archives/libguestfs/2020-June/msg00086.html
to handle this bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1848862
I was able to observe this bug and for me at least disabling readahead
seems to cure it.
Patches 2 and 3 are simplifications, removing a now-undocumented
feature of virt-v2v-copy-to-local and thus simplifying greatly the
VCenter module.
Patch 4 contains the change to use cookie-script to renew the VMware
cookie.
Rich.