reproduce (this is a W=1 build): # https://github.com/jimc/linux/commit/9cf8914e3a113c16ba8cd3da48422401f20cfc33 git remote add jimc https://github.com/jimc/linux.git git fetch --no-tags jimc dd-fix-classmap-add-trace-1a git checkout 9cf8914e3a113c16ba8cd3da48422401f20cfc33 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 olddefconfig make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/btrfs/