GELI "failed to read pad2 area of primary vdev" - not a showstopper
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First and foremost, this is not a showstopper and doesn't appear to affect any functionality. Everything is working. The system boots up just fine after entering the correct password.
I have a test instance in VirtualBox running 2.4.0-RELEASE. I've been playing with GELI Full Disk Encryption for several months and haven't gotten this error until now.