[Bug 206600] geli with new "setkey -n 1" pwd is rejecting pwd 3 times, than ascing for gpt/zfs0.eli pwd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206600

            Bug ID: 206600
           Summary: geli with new "setkey -n 1" pwd is rejecting pwd 3
                    times, than ascing for gpt/zfs0.eli pwd
           Product: Base System
           Version: 10.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: marc.arnold.bach at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hello,
I have a test installation in a vmware and  zpool status shows a root-pool in
/dev/da0p4.eli => encrypted blockdevice
Its result of bsd's  "auto zfs root" installation with encryption flag set to
"yes"


Symptom:
System reboots and is rejecting the new pwd (which very short and simple and
very independent from keyboardlayout => asdfg)
It asks first generically for geli pwd... later 3 times explicitly for
/dev/da0pa while counting down "free tries". At the end it asks for
/gpz/zfs0.eli pwd and is booting with asdfg string as pwd

After reboot zpool status shows the rootpool to be located at gpt/zfs0.eli not
dev/da0p4 anymore 

Steps to reproduce this:
- Adding a new password in slot 1 is succesfull with 
root# geli setkey -n 1 /dev/da0p4
[...blabla] may exist old metadata in /var/backups [...blabla] 
root# reboot


Some tests I made:
- Using initial pwd from init "qwert" works still fine and I can start system
with one keyboard action qwert-Enter

- Using setkey -n 0 will overwrite first key succesfully but will end up in
rejecting pwd 4 times later again.

- By the way I opened another ticket because restoring the metadata to a
working pwd is "not permitted" as well.


Regards Marc

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