[Bug 237517] ZFS parallel mounting sometimes misses mounting intermediate filesystems

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237517

            Bug ID: 237517
           Summary: ZFS parallel mounting sometimes misses mounting
                    intermediate filesystems
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: Trond.Endrestol at ximalas.info

Both Jim Long and myself experience ZFS parallel mount misses mounting
intermediate filesystems.

As far as I can tell, this behaviour is not deterministic, sometimes the
parallel mounting succeeds and sometimes it doesn't.

See these threads,
https://lists.freebsd.org/pipermail/freebsd-stable/2019-April/090898.html and
https://lists.freebsd.org/pipermail/freebsd-questions/2019-April/284974.html.

Here are a couple of suggestions:

Can we make parallel mounting optional for us that don't need it or want it?
Or, can parallel mounting be changed so that filesystems off the root pool is
completely mounted before all other pools?

This still leaves the possibility of the kernel attempting to mount pool/a/b
before pool/a, even if both filesystems have their canmount properties set to
on, and one being a child of the other.

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