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8792dd24cd
The mountpoint may still be busy when the `zfs unmount -a` command
is run causing an unexpected failure. Retry the unmount a couple
of times since it should not remain busy for long.
19:10:50.29 NOTE: Reading state from .../inheritance/state021.cfg
19:10:50.32 cannot unmount '/TESTPOOL': pool or dataset is busy
19:10:50.32 ERROR: zfs unmount -a exited 1
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #13686