tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git acpica-osl head: 20957f62fa1421ff73e5f0e1167a9ea826c69d6b commit: 20957f62fa1421ff73e5f0e1167a9ea826c69d6b [2/2] ACPI: OSL: Add support for deferred unmapping of ACPI memory config: x86_64-randconfig-r012-20200614 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project cb5072d1877b38c972f95092db2cedbcddb81da6) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 20957f62fa1421ff73e5f0e1167a9ea826c69d6b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): return; ^ 1 error generated. vim +/acpi_os_unref_iomem +409 drivers/acpi/osl.c 392 393 static bool __ref acpi_os_unref_iomem(void __iomem *virt, acpi_size size) 394 { 395 struct acpi_ioremap *map; 396 bool ret; 397 398 if (!acpi_permanent_mmap) { 399 __acpi_unmap_table(virt, size); 400 return false; 401 } 402 403 mutex_lock(&acpi_ioremap_lock); 404 405 map = acpi_map_lookup_virt(virt, size); 406 if (!map) { 407 mutex_unlock(&acpi_ioremap_lock); 408 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 410 } 411 ret = acpi_os_drop_map_ref(map); 412 413 mutex_unlock(&acpi_ioremap_lock); 414 415 return ret; 416 } 417 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org