[Bug 222199] zfs command crashed with option checksum=skein

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222199

            Bug ID: 222199
           Summary: zfs command crashed with option checksum=skein
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sternix at gmail.com

Hi 

My FreeBSD version is:
FreeBSD ... 11.1-RELEASE-p1 FreeBSD 11.1-RELEASE-p1 #0: Wed Aug  9 11:55:48 UTC
2017     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

i want to to test zfs's skein checksum option

in man page ( man 8 zfs )
"The sha512, and skein checksum algorithms require enabling the appropriate
features on the pool."

The feature is enabled i think

# zpool get feature at skein
NAME   PROPERTY       VALUE          SOURCE
zroot  feature at skein  enabled        local

when i want to create a test dataset with the command
# zfs create -o checksum=skein zroot/test
 internal error: Result too large
 Abort (core dumped)

trying create a dataset and set property is not work either
# zfs create zroot/test
# zfs set checksum=skein zroot/test
cannot set property for 'zroot/test': property setting is not allowed on root
pools

and 

# zfs set checksum=skein zroot
Cannot set property for 'zroot': property setting is not allowed on root pools

am i doing something wrong or is this a bug ?
Can you help?

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