[Bug 203864] ZFS deadlock between zfs send, zfs rename and ctrl-C

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203864

--- Comment #17 from Andriy Gapon <avg at FreeBSD.org> ---
Another observation is that the current code seems to be broken in a couple of
places as well.

1. dsl_dataset_rename_snapshot_sync_impl() uses ddrsa_fsname to construct the
old and new snapshot names, but this would be wrong in the case of a recursive
snpashot rename (zfs rename -r x at snap1 x at snap2) as ddrsa_fsname always points
to the name of the top level filesystem.

2. dsl_dataset_promote_sync(): as far as I can see, oldname is never populated,
so the code can do arbitrary renames.

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