Vladimir - please try the kernel in proposed, Ubuntu-4.4.0-38.57. It has a patch that likely addresses your bug: "UBUNTU: SAUCE: overlayfs: fix regression in whiteout detection".
Vladimir - please try the kernel in proposed, Ubuntu-4.4.0-38.57. It has a patch that likely addresses your bug: "UBUNTU: SAUCE: overlayfs: fix regression in whiteout detection".