mount root from zfs fails under current with "error 6"

[Michael Reifenberger]

Hi,
I get the following error with recent -current (r222417) during boot:
...
Trying to mount root from zfs:boot/ROOT/root []...
Mounting from zfs:boot/ROOT/root failed with error 6.
...

What does "error 6" mean?

The strange thing is, that I could boot with r222417 a few times
but after applying a (here unrelated) one-liner from rmacklem@ to 
nfs_clkdtrace.c, recompile the module and reinstall, I could'n load either kernel nor kernel.old.
I didn't even use the patched module.

Only loading a kernel r221381 let me boot again.

So may it be a race condition of some form?

Anyone else sees this?

Any further infos are available on request.

Bye/2
---
Michael Reifenberger
Michael at Reifenberger.com
http://www.Reifenberger.com