On Fri, Feb 23, 2024 at 12:38:46PM -0500, Mike Snitzer wrote:

Also, you can use the lvm2 source code's testsuite to get really solid
DM test coverge (particularly for changes in this patchset which is
dealing with setting limits at device creation).

And that one runs fine, although even with Jens' tree as a baseline
it hangs in the md code when dm tries to stop it.  Trying mainline
now..