[Bug 229958] ctld / zfs deadlock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229958

            Bug ID: 229958
           Summary: ctld / zfs deadlock
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: bugzilla.freebsd at omnilan.de

Hello,

'zfs rename poolA/iscsivolumeX poolA/iscsiVOLx' locks up the ZFS pool poolA, if
/dev/zvol/poolA/iscsivolumeX is used as target LUN path in ctld(8).

The machine is still operational and datasets from other pools are accessable,
but no dataset of poolA.
Reboot doesn't succeed, machine hangs after "Syncing disks, vnodes remaining...
1 1 1 0 0 ..... done"
"All buffers synced."
  HANG

I'm quiet sure the pool lockup wasn't an issue in FreeBSD 10, since I often
forgot to disable zvol ctld(8) backends before renaming the dataset.

Is this in any way related to
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220175 ???

And perhaps my other big ctld(8) problem might be related too?
https://lists.freebsd.org/pipermail/freebsd-stable/2018-July/089268.html

Sorry for combining problem descriptions, but I'm observing severe iSCSI
regressions on all systems I updated to 11.2.  Unfortunately initiators were
updated too, so the root cause is not clear.

Thanks,

-harry

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