diff --git a/fs/xfs/scrub/reap.c b/fs/xfs/scrub/reap.c
index 847c6f836102..df13a9e0fe86 100644
--- a/fs/xfs/scrub/reap.c
+++ b/fs/xfs/scrub/reap.c
@@ -149,7 +149,7 @@ xrep_block_reap_binval(
 	 */
 	error = xfs_buf_incore(sc->mp->m_ddev_targp,
 			XFS_FSB_TO_DADDR(sc->mp, fsbno),
-			XFS_FSB_TO_BB(sc->mp, 1), 0, &bp);
+			XFS_FSB_TO_BB(sc->mp, 1), XBF_LIVESCAN, &bp);
 	if (error)
 		return;
 
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 15d1e5a7c2d3..fa392c43ba16 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -481,7 +481,8 @@ _xfs_buf_obj_cmp(
 		 * reallocating a busy extent. Skip this buffer and
 		 * continue searching for an exact match.
 		 */
-		ASSERT(bp->b_flags & XBF_STALE);
+		if (!(map->bm_flags & XBM_LIVESCAN))
+			ASSERT(bp->b_flags & XBF_STALE);
 		return 1;
 	}
 	return 0;
@@ -559,6 +560,10 @@ xfs_buf_find_lock(
 	 * intact here.
 	 */
 	if (bp->b_flags & XBF_STALE) {
+		if (flags & XBF_LIVESCAN) {
+			xfs_buf_unlock(bp);
+			return -ENOENT;
+		}
 		ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
 		bp->b_flags &= _XBF_KMEM | _XBF_PAGES;
 		bp->b_ops = NULL;
@@ -682,6 +687,8 @@ xfs_buf_get_map(
 	int			error;
 	int			i;
 
+	if (flags & XBF_LIVESCAN)
+		cmap.bm_flags |= XBM_LIVESCAN;
 	for (i = 0; i < nmaps; i++)
 		cmap.bm_len += map[i].bm_len;
 
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 549c60942208..df8f47953bb4 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -44,6 +44,11 @@ struct xfs_buf;
 #define _XBF_DELWRI_Q	 (1u << 22)/* buffer on a delwri queue */
 
 /* flags used only as arguments to access routines */
+/*
+ * Online fsck is scanning the buffer cache for live buffers.  Do not warn
+ * about length mismatches during lookups and do not return stale buffers.
+ */
+#define XBF_LIVESCAN	 (1u << 28)
 #define XBF_INCORE	 (1u << 29)/* lookup only, return if found in cache */
 #define XBF_TRYLOCK	 (1u << 30)/* lock requested, but do not wait */
 #define XBF_UNMAPPED	 (1u << 31)/* do not map the buffer */
@@ -67,6 +72,7 @@ typedef unsigned int xfs_buf_flags_t;
 	{ _XBF_KMEM,		"KMEM" }, \
 	{ _XBF_DELWRI_Q,	"DELWRI_Q" }, \
 	/* The following interface flags should never be set */ \
+	{ XBF_LIVESCAN,		"LIVESCAN" }, \
 	{ XBF_INCORE,		"INCORE" }, \
 	{ XBF_TRYLOCK,		"TRYLOCK" }, \
 	{ XBF_UNMAPPED,		"UNMAPPED" }
@@ -114,8 +120,15 @@ typedef struct xfs_buftarg {
 struct xfs_buf_map {
 	xfs_daddr_t		bm_bn;	/* block number for I/O */
 	int			bm_len;	/* size of I/O */
+	unsigned int		bm_flags;
 };
 
+/*
+ * Online fsck is scanning the buffer cache for live buffers.  Do not warn
+ * about length mismatches during lookups and do not return stale buffers.
+ */
+#define XBM_LIVESCAN		(1U << 0)
+
 #define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
 	struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };