[Bug 283218] Panic while writting on mdconfig file stored on ZFS panic since zfs: merge openzfs/zfs@b10992582

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283218

            Bug ID: 283218
           Summary: Panic while writting on mdconfig file stored on ZFS
                    panic since zfs: merge openzfs/zfs@b10992582
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: olivier@freebsd.org
 Attachment #255733 text/plain
         mime type:

Created attachment 255733
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=255733&action=edit
script trying to reproduce the panic

Since commit "7a7741af18d6c8a804cc643cb7ecda9d730c6aa6" (zfs: merge
openzfs/zfs@b10992582), all my Jenkins builders are crashing while preparing
bhyve VM for regression tests.

The servers are using zpool, mdconfig mount disk image to patch it for
regression tests and crash while writting on it.

I’ve tried to wrote a regression test script, but this isn’t working at 100%
rate, because it seems it need a zpool with "some" history.
Was able to reproduce on x86 (hardware and VM) and ARM (VM) with any kind of
zpool (non-raid, zmirror and raidz).

Attached a shell script that should reproduce it, but this script is a lot more
efficient to crash if pointing to an "existing" zpool (with some history):
./zfscrash.sh -z existing-zpool-name

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