Shaoxiong Li composes a patch for this problem, https://github.com/dahefanteng/bcache-tools/commit/5cb9e78ac083a3e6f608622c29c95971640872cc So far the test looks working, can anybody else help to confirm whether the problem is fixed by this patch ? Then I can be more confident to merge this patch and have them in 15.1. Thanks in advance.