[Bug 273772] zpool nested in ZVOL becomes unaccesible when zfsd(8) is running on host

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273772

            Bug ID: 273772
           Summary: zpool nested in ZVOL becomes unaccesible when zfsd(8)
                    is running on host
           Product: Base System
           Version: 14.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: zarychtam@plan-b.pwste.edu.pl

After upgrading to stable/14 a bhyve VM deployed on a ZVOL cannot access its
zpool when zfsd(8) is running on the bhyve host. The VM boots fine when zfsd(8)
on the host machine is shut down. The sysctl knob vfs.zfs.vol.recursive is set
to 0 on the host.


Trying to mount root from zfs:vmzroot/ROOT/default []...
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
Mounting from zfs:vmzroot/ROOT/default failed with error 6; retrying for 3 more
seconds
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
vtbd0: hard error cmd=write 1592-1607
vtbd0: hard error cmd=write 94371896-94371911
vtbd0: hard error cmd=write 94372408-94372423
Mounting from zfs:vmzroot/ROOT/default failed with error 6.

Loader variables:
  vfs.root.mountfrom=zfs:vmzroot/ROOT/default

Manual root filesystem specification:
  <fstype>:<device> [options]
      Mount <device> using filesystem <fstype>
      and with the specified (optional) option list.

    eg. ufs:/dev/da0s1a
        zfs:zroot/ROOT/default
        cd9660:/dev/cd0 ro
          (which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /)

  ?               List valid disk boot devices
  .               Yield 1 second (for background tasks)
  <empty line>    Abort manual input

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