This bug was detected and fix by Arnd Bergmann: https://lore.kernel.org/lkml/CAKEwX=OTpY9Wg6YPfADDqeu7FFzciY9o_nNE5dRR3cu_-2ntaw@xxxxxxxxxxxxxx/T/ It is triggered when neither CONFIG_ZPOOL nor CONFIG_COMPACTION is set. On Thu, Jan 19, 2023 at 1:16 AM kernel test robot <yujie.liu@xxxxxxxxx> wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-hotfixes-unstable > head: 4de77094279d6b179bab4314bdca80e6694cfcf0 > commit: f950c3c5d55be15a74d250edde93e404c6ecd409 [25/30] zsmalloc: fix a race with deferred_handles storing > config: hexagon-buildonly-randconfig-r001-20230118 (https://download.01.org/0day-ci/archive/20230119/202301190830.4tstTsgZ-lkp@xxxxxxxxx/config) > compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a) > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=f950c3c5d55be15a74d250edde93e404c6ecd409 > git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git > git fetch --no-tags akpm-mm mm-hotfixes-unstable > git checkout f950c3c5d55be15a74d250edde93e404c6ecd409 > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash > > If you fix the issue, kindly add following tag where applicable > | Reported-by: kernel test robot <yujie.liu@xxxxxxxxx> > > All warnings (new ones prefixed by >>): > > >> mm/zsmalloc.c:940:13: warning: unused function 'obj_allocated' [-Wunused-function] > static bool obj_allocated(struct page *page, void *obj, unsigned long *phandle) > ^ > > Please check if it needs to be guarded with a config. > > > vim +/obj_allocated +940 mm/zsmalloc.c > > 312fcae22703761 Minchan Kim 2015-04-15 939 > f950c3c5d55be15 Nhat Pham 2023-01-10 @940 static bool obj_allocated(struct page *page, void *obj, unsigned long *phandle) > f950c3c5d55be15 Nhat Pham 2023-01-10 941 { > f950c3c5d55be15 Nhat Pham 2023-01-10 942 return obj_tagged(page, obj, phandle, OBJ_ALLOCATED_TAG); > f950c3c5d55be15 Nhat Pham 2023-01-10 943 } > f950c3c5d55be15 Nhat Pham 2023-01-10 944 > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests
