tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 8ca403f3e7a23c4513046ad8d107adfbe4703362 commit: 9cf1d7d830f4a586dfa4ddcaf9eae3959e0708ef [5214/6860] ARC: cmpxchg/xchg: rewrite as macros to make type safe config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 10.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-348-gf0e6938b-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 9cf1d7d830f4a586dfa4ddcaf9eae3959e0708ef # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arc 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 >>) kernel/sys.c:1896:19: sparse: expected struct file [noderef] __rcu *_val_ kernel/sys.c:1896:19: sparse: got struct file *[assigned] file kernel/sys.c:1896:17: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct file *old_exe @@ got struct file [noderef] __rcu *[assigned] _val_ @@ kernel/sys.c:1896:17: sparse: expected struct file *old_exe kernel/sys.c:1896:17: sparse: got struct file [noderef] __rcu *[assigned] _val_ kernel/sys.c:1067:32: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct task_struct *p1 @@ got struct task_struct [noderef] __rcu *real_parent @@ kernel/sys.c:1067:32: sparse: expected struct task_struct *p1 kernel/sys.c:1067:32: sparse: got struct task_struct [noderef] __rcu *real_parent kernel/sys.c: note: in included file (through include/linux/rcuwait.h, include/linux/percpu-rwsem.h, include/linux/fs.h, ...): include/linux/sched/signal.h:714:37: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ include/linux/sched/signal.h:714:37: sparse: expected struct spinlock [usertype] *lock include/linux/sched/signal.h:714:37: sparse: got struct spinlock [noderef] __rcu * -- net/ipv4/tcp_cong.c:238:24: sparse: expected struct tcp_congestion_ops const [noderef] __rcu *_val_ net/ipv4/tcp_cong.c:238:24: sparse: got struct tcp_congestion_ops *[assigned] ca net/ipv4/tcp_cong.c:238:22: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct tcp_congestion_ops const *prev @@ got struct tcp_congestion_ops const [noderef] __rcu *[assigned] _val_ @@ net/ipv4/tcp_cong.c:238:22: sparse: expected struct tcp_congestion_ops const *prev net/ipv4/tcp_cong.c:238:22: sparse: got struct tcp_congestion_ops const [noderef] __rcu *[assigned] _val_ vim +1896 kernel/sys.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 1845 6e399cd144d850 Davidlohr Bueso 2015-04-16 1846 static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) b32dfe377102ce Cyrill Gorcunov 2012-05-31 1847 { 2903ff019b346a Al Viro 2012-08-28 1848 struct fd exe; 6e399cd144d850 Davidlohr Bueso 2015-04-16 1849 struct file *old_exe, *exe_file; 496ad9aa8ef448 Al Viro 2013-01-23 1850 struct inode *inode; 2903ff019b346a Al Viro 2012-08-28 1851 int err; b32dfe377102ce Cyrill Gorcunov 2012-05-31 1852 2903ff019b346a Al Viro 2012-08-28 1853 exe = fdget(fd); 2903ff019b346a Al Viro 2012-08-28 1854 if (!exe.file) b32dfe377102ce Cyrill Gorcunov 2012-05-31 1855 return -EBADF; b32dfe377102ce Cyrill Gorcunov 2012-05-31 1856 496ad9aa8ef448 Al Viro 2013-01-23 1857 inode = file_inode(exe.file); b32dfe377102ce Cyrill Gorcunov 2012-05-31 1858 b32dfe377102ce Cyrill Gorcunov 2012-05-31 1859 /* b32dfe377102ce Cyrill Gorcunov 2012-05-31 1860 * Because the original mm->exe_file points to executable file, make b32dfe377102ce Cyrill Gorcunov 2012-05-31 1861 * sure that this one is executable as well, to avoid breaking an b32dfe377102ce Cyrill Gorcunov 2012-05-31 1862 * overall picture. b32dfe377102ce Cyrill Gorcunov 2012-05-31 1863 */ b32dfe377102ce Cyrill Gorcunov 2012-05-31 1864 err = -EACCES; 90f8572b0f021f Eric W. Biederman 2015-06-29 1865 if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path)) b32dfe377102ce Cyrill Gorcunov 2012-05-31 1866 goto exit; b32dfe377102ce Cyrill Gorcunov 2012-05-31 1867 02f92b3868a1b3 Christian Brauner 2021-01-21 1868 err = file_permission(exe.file, MAY_EXEC); b32dfe377102ce Cyrill Gorcunov 2012-05-31 1869 if (err) b32dfe377102ce Cyrill Gorcunov 2012-05-31 1870 goto exit; b32dfe377102ce Cyrill Gorcunov 2012-05-31 1871 bafb282df29c15 Konstantin Khlebnikov 2012-06-07 1872 /* 4229fb1dc6843c Konstantin Khlebnikov 2012-07-11 1873 * Forbid mm->exe_file change if old file still mapped. bafb282df29c15 Konstantin Khlebnikov 2012-06-07 1874 */ 6e399cd144d850 Davidlohr Bueso 2015-04-16 1875 exe_file = get_mm_exe_file(mm); bafb282df29c15 Konstantin Khlebnikov 2012-06-07 1876 err = -EBUSY; 6e399cd144d850 Davidlohr Bueso 2015-04-16 1877 if (exe_file) { 4229fb1dc6843c Konstantin Khlebnikov 2012-07-11 1878 struct vm_area_struct *vma; 4229fb1dc6843c Konstantin Khlebnikov 2012-07-11 1879 d8ed45c5dcd455 Michel Lespinasse 2020-06-08 1880 mmap_read_lock(mm); 6e399cd144d850 Davidlohr Bueso 2015-04-16 1881 for (vma = mm->mmap; vma; vma = vma->vm_next) { 6e399cd144d850 Davidlohr Bueso 2015-04-16 1882 if (!vma->vm_file) 6e399cd144d850 Davidlohr Bueso 2015-04-16 1883 continue; 6e399cd144d850 Davidlohr Bueso 2015-04-16 1884 if (path_equal(&vma->vm_file->f_path, 6e399cd144d850 Davidlohr Bueso 2015-04-16 1885 &exe_file->f_path)) 6e399cd144d850 Davidlohr Bueso 2015-04-16 1886 goto exit_err; 6e399cd144d850 Davidlohr Bueso 2015-04-16 1887 } 6e399cd144d850 Davidlohr Bueso 2015-04-16 1888 d8ed45c5dcd455 Michel Lespinasse 2020-06-08 1889 mmap_read_unlock(mm); 6e399cd144d850 Davidlohr Bueso 2015-04-16 1890 fput(exe_file); bafb282df29c15 Konstantin Khlebnikov 2012-06-07 1891 } bafb282df29c15 Konstantin Khlebnikov 2012-06-07 1892 4229fb1dc6843c Konstantin Khlebnikov 2012-07-11 1893 err = 0; 6e399cd144d850 Davidlohr Bueso 2015-04-16 1894 /* set the new file, lockless */ 6e399cd144d850 Davidlohr Bueso 2015-04-16 1895 get_file(exe.file); 6e399cd144d850 Davidlohr Bueso 2015-04-16 @1896 old_exe = xchg(&mm->exe_file, exe.file); 6e399cd144d850 Davidlohr Bueso 2015-04-16 1897 if (old_exe) 6e399cd144d850 Davidlohr Bueso 2015-04-16 1898 fput(old_exe); b32dfe377102ce Cyrill Gorcunov 2012-05-31 1899 exit: 2903ff019b346a Al Viro 2012-08-28 1900 fdput(exe); b32dfe377102ce Cyrill Gorcunov 2012-05-31 1901 return err; 6e399cd144d850 Davidlohr Bueso 2015-04-16 1902 exit_err: d8ed45c5dcd455 Michel Lespinasse 2020-06-08 1903 mmap_read_unlock(mm); 6e399cd144d850 Davidlohr Bueso 2015-04-16 1904 fput(exe_file); 6e399cd144d850 Davidlohr Bueso 2015-04-16 1905 goto exit; b32dfe377102ce Cyrill Gorcunov 2012-05-31 1906 } b32dfe377102ce Cyrill Gorcunov 2012-05-31 1907 :::::: The code at line 1896 was first introduced by commit :::::: 6e399cd144d8500ffb5d40fa6848890e2580a80a prctl: avoid using mmap_sem for exe_file serialization :::::: TO: Davidlohr Bueso <dave(a)stgolabs.net&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