Got the same kernel version from kernel-source, but still failed to reproduce on newly created fs. Thus I guess there is something related to the fs. Would you please take a btrfs-image dump by: # btrfs-image -c9 <device> dump.img This need the fs to be unmounted. And upload to the R&D network server. Feel free to do extra compression on the image dump. And since the fs needs to be unmounted anyway, a btrfs check may also help.