Hi Yaroslav, Is this bug for linux-image or btrfs-tools? Kernels based on linux-4.4.6 and linux-4.5.1 are available, and I've updated btrfs-progs to v4.4.1. I'm planning to upload v4.5.2 soon, for completeness, but it will be to experimental, because I've read a couple of reports of problems that were solved by downgrading to btrfs-progs v4.4.x.
Kind regards, Nicholas