Hi Vlastimil, First bad commit (maybe != root cause): tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: e13fc58b3474aaf6ae05dc888b9e3ca48d38a903 commit: 5f43305837b4434a1705bc116ed0058433393354 [1765/1765] mm, slab, slub: stop taking cpu hotplug lock config: x86_64-buildonly-randconfig-006-20250827 (https://download.01.org/0day-ci/archive/20250828/202508280121.PaFXBIZM-lkp@i...) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250828/202508280121.PaFXBIZM-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202508280121.PaFXBIZM-lkp@intel.com/ All warnings (new ones prefixed by >>):

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mm/slab_common.o: warning: objtool: kmem_cache_create_usercopy()+0x268: unreachable instruction

-- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki