OCS QE team is following up this BZ. GSS and development team can contact us if any help or information is needed from our end
Acking for 4.8 and we also should clone to 4.7.z after confirming the fix. The side effect of this issue to lose quorum is too severe and the workaround of reseting the mon quorum to a single mon for recovery is too involved.
The fix is low risk, we should backport to 4.7.z and 4.6.z
This is merged downstream to 4.8 with https://github.com/openshift/rook/pull/235.
I'll clone for 4.7.z and 4.6.z.