tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git set_fs head: 0a081326831928b0d739bce68b8c0f9138b9c8ba commit: a954036380ae20dbfa0c203bf6cafb21d1f3cedd [6/11] uaccess: generalize access_ok() config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220213/202202131523.w4Vvi8jc-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground set_fs git checkout a954036380ae20dbfa0c203bf6cafb21d1f3cedd # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) lib/test_lockup.c:420:13: sparse: expected void const [noderef] __user *ptr lib/test_lockup.c:420:13: sparse: got void *ptr lib/test_lockup.c:421:13: sparse: expected void const [noderef] __user *ptr lib/test_lockup.c:421:13: sparse: got void * lib/test_lockup.c:230:9: sparse: sparse: context imbalance in 'test_lock' - wrong count at exit lib/test_lockup.c:250:25: sparse: sparse: context imbalance in 'test_unlock' - unexpected unlock vim +420 lib/test_lockup.c 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 410 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 411 static bool test_kernel_ptr(unsigned long addr, int size) 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 412 { 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 413 void *ptr = (void *)addr; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 414 char buf; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 415 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 416 if (!addr) 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 417 return false; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 418 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 419 /* should be at least readable kernel address */ 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 @420 if (access_ok(ptr, 1) || 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 @421 access_ok(ptr + size - 1, 1) || 25f12ae45fc193 Christoph Hellwig 2020-06-17 422 get_kernel_nofault(buf, ptr) || 25f12ae45fc193 Christoph Hellwig 2020-06-17 423 get_kernel_nofault(buf, ptr + size - 1)) { 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 424 pr_err("invalid kernel ptr: %#lx\n", addr); 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 425 return true; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 426 } 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 427 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 428 return false; 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 429 } 30428ef5d1e8ca Konstantin Khlebnikov 2020-04-06 430 :::::: The code at line 420 was first introduced by commit :::::: 30428ef5d1e8caf78639cc70a802f1cb7b1cec04 lib/test_lockup: test module to generate lockups :::::: TO: Konstantin Khlebnikov <khlebnikov(a)yandex-team.ru&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org