[Bug 215067] [zfs] g_dev_taste: make_dev_p() failed on importing pool with snapshots with long names

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215067

            Bug ID: 215067
           Summary: [zfs] g_dev_taste: make_dev_p() failed on importing
                    pool with snapshots with long names
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rainer at ultra-secure.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hi,

we send snapshots from a host with (old) SmartOS to a FreeBSD 10.1.


hw.machine: amd64
hw.model: Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
hw.ncpu: 12
hw.byteorder: 1234
hw.physmem: 68558307328
hw.usermem: 15738359808
hw.pagesize: 4096
hw.floatingpoint: 1
hw.machine_arch: amd64
hw.realmem: 70866960384


This server was never really rebooted after it went into production, so upon
reboot (bringing it to 10.1-RELEASE-p41, to update it to 10.3-RELEASE
afterwards), it was discovered that it couldn't import its zpool anymore.

Lots and lots of
g_dev_taste: make_dev_p() failed
(gp->name=zvol/storage/backup/ahostnamehere/some-guid-disk1 at zfs-auto-snap:daily-2016-11-22-00:00,
error=63)

It seems there is a 63 character limit in place here (judging from various post
in mailing-lists).

I booted with the 11.0 install CD and tried to mount the zpool with that
(LiveCD mode) - it showed the same error messages.

I'm updating it to 10.3 at the moment, for the sake of having it on a supported
release.

Is there any fix for this?
We're not really in a position to rename the snapshots on the source-system.

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