Backport upstream patches: [PATCH 1/2] monitor: make return from read_and_act more symbolic. 77b3ac8c6521d836dd3c6ef247c252293920fd52 [PATCH 2/2] monitor: ensure we retry soon when 'remove' fails. 68226a80812cd9fce63dbd14d2225ffdf16a781b
Fixed in mdadm-3.2.3-3