diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index a18bc75cc216..66efc702452a 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -606,20 +606,20 @@ xfs_ialloc_ag_alloc(
 	uint16_t	allocmask = (uint16_t) -1; /* init. to full chunk */
 	struct xfs_inobt_rec_incore rec;
 	struct xfs_perag *pag;
-
 	int		do_sparse = 0;
 
-#ifdef DEBUG
-	/* randomly do sparse inode allocations */
-	if (xfs_sb_version_hassparseinodes(&tp->t_mountp->m_sb))
-		do_sparse = prandom_u32() & 1;
-#endif
-
 	memset(&args, 0, sizeof(args));
 	args.tp = tp;
 	args.mp = tp->t_mountp;
 	args.fsbno = NULLFSBLOCK;
 
+#ifdef DEBUG
+	/* randomly do sparse inode allocations */
+	if (xfs_sb_version_hassparseinodes(&tp->t_mountp->m_sb) &&
+	    args.mp->m_ialloc_min_blks < args.mp->m_ialloc_blks)
+		do_sparse = prandom_u32() & 1;
+#endif
+
 	/*
 	 * Locking will ensure that we don't have two callers in here
 	 * at one time.
@@ -768,6 +768,7 @@ xfs_ialloc_ag_alloc(
 			return error;
 
 		newlen = args.len << args.mp->m_sb.sb_inopblog;
+		ASSERT(newlen <= XFS_INODES_PER_CHUNK);
 		allocmask = (1 << (newlen / XFS_INODES_PER_HOLEMASK_BIT)) - 1;
 	}
 
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 4c054f6634b9..17cd90c19634 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2244,6 +2244,7 @@ xfs_ifree_cluster(
 	int			inodes_per_cluster;
 	int			nbufs;
 	int			i, j;
+	int			ioffset;
 	xfs_daddr_t		blkno;
 	xfs_buf_t		*bp;
 	xfs_inode_t		*ip;
@@ -2264,9 +2265,9 @@ xfs_ifree_cluster(
 		 * physically allocated. Skip the cluster if an inode falls into
 		 * a sparse region.
 		 */
-		if ((xic->alloc & XFS_INOBT_MASK(inum - xic->first_ino)) == 0) {
-			ASSERT(((inum - xic->first_ino) %
-				inodes_per_cluster) == 0);
+		ioffset = inum - xic->first_ino;
+		if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
+			ASSERT(do_mod(ioffset, inodes_per_cluster) == 0);
 			continue;
 		}