As explained by the disclaimer in the test case,
"This test can fail since nothing guarantees that old
MOS blocks aren't overwritten."
This behavior is expected and correct, but results in a
flaky test case which is problematic for the CI. The best
we can do to resolve this is to retry the sub-test which
failed when the MOS blocks have clearly been overwritten.
When testing failures were rare enough that a single retry
should normally be sufficient. However, we allow up to
five for good measure.
Reviewed by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes#13119
190516f0c5