tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git realtime-rmap
head:   62eb0024d510607ecb04789e8b4f8c0975efb08b
commit: f4188e5ab1984e1b140433a80f223ab4644801af [245/249] xfs: online repair of realtime file bmaps
config: x86_64-randconfig-a011-20201217 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/commit/?id=f4188e5ab1984e1b140433a80f223ab4644801af
        git remote add djwong-xfs https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git
        git fetch --no-tags djwong-xfs realtime-rmap
        git checkout f4188e5ab1984e1b140433a80f223ab4644801af
        # 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@intel.com>

All warnings (new ones prefixed by >>):

>> fs/xfs/scrub/repair.c:2202:6: warning: variable 'is_free' is uninitialized when used here [-Wuninitialized]
           if (is_free)
               ^~~~~~~
   fs/xfs/scrub/repair.c:2189:16: note: initialize the variable 'is_free' to silence this warning
           bool                    is_free;
                                          ^
                                           = 0
   1 warning generated.


vim +/is_free +2202 fs/xfs/scrub/repair.c

  2173	
  2174	/*
  2175	 * Check if any part of this range of rt blocks is free, so that we don't
  2176	 * rebuild things with bad records.  Returns -EFSCORRUPTED if bad.
  2177	 */
  2178	int
  2179	xrep_rtext_is_free(
  2180		struct xfs_scrub	*sc,
  2181		xfs_rtblock_t		rtbno,
  2182		xfs_filblks_t		len)
  2183	{
  2184		struct xfs_mount	*mp = sc->mp;
  2185		xfs_rtblock_t		startext;
  2186		xfs_rtblock_t		endext;
  2187		xfs_rtblock_t		extcount;
  2188		uint32_t		mod;
  2189		bool			is_free;
  2190		int			error;
  2191	
  2192		/* Convert rt blocks to rt extents. */
  2193		startext = div_u64_rem(rtbno, mp->m_sb.sb_rextsize, &mod);
  2194		endext = div_u64_rem(rtbno + len - 1, mp->m_sb.sb_rextsize, &mod);
  2195	
  2196		/* Make sure this isn't free space. */
  2197		extcount = endext - startext + 1;
  2198		error = xfs_rtalloc_extent_is_free(mp, sc->tp, startext, extcount,
  2199				&is_free);
  2200		if (error)
  2201			return error;
> 2202		if (is_free)
  2203			return -EFSCORRUPTED;
  2204	
  2205		return 0;
  2206	}
  2207	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org