Harald Hoyer authored Apr 21, 2017 and Milan Broz committed Apr 26, 2017

Somehow testing in qemu resulted sometimes in an endless loop.
Either the timing or the settle fixed the issue.
When the VM was in an endless loop, an strace showed, that the first 512
and 1024 of the crypt partition was read over and over. Either it was
the udev blkid, or some device mapper udev rule.
Maybe the reencrypt tool opens and closes the device fd, where the close
triggers a udev blkid and causes the reencrypt tool to reread the device...
Anyhow.. with this settle the issue was not seen anymore.