Hey Ben, Salvatore. Thanks for cherry-picking the bug for unstable.
AFAIU stretch and jessie[-backports] should be affected as well. Shouldn't it go there, too? At least at the upstream mailing list it was said[0] the the bug was introduced around October 2008, which should be roughly kernel 2.6.23. Cheers, Chris. [0] https://lore.kernel.org/linux-btrfs/cal3q7h599_kdpdfhmrqswnlxktanc7aaqbe+hm6jjpr37us...@mail.gmail.com/