diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index 580ccbd5aadc..f5f629174eca 100644
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -61,7 +61,8 @@
 #define XFS_ERRTAG_LARP					39
 #define XFS_ERRTAG_DA_LEAF_SPLIT			40
 #define XFS_ERRTAG_ATTR_LEAF_TO_NODE			41
-#define XFS_ERRTAG_MAX					42
+#define XFS_ERRTAG_WB_DELAY_MS				42
+#define XFS_ERRTAG_MAX					43
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -107,5 +108,6 @@
 #define XFS_RANDOM_LARP					1
 #define XFS_RANDOM_DA_LEAF_SPLIT			1
 #define XFS_RANDOM_ATTR_LEAF_TO_NODE			1
+#define XFS_RANDOM_WB_DELAY_MS				3000
 
 #endif /* __XFS_ERRORTAG_H_ */
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index a22d90af40c8..4a13260527b9 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -17,6 +17,8 @@
 #include "xfs_bmap.h"
 #include "xfs_bmap_util.h"
 #include "xfs_reflink.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
 
 struct xfs_writepage_ctx {
 	struct iomap_writepage_ctx ctx;
@@ -217,11 +219,15 @@ xfs_imap_valid(
 	 * checked (and found nothing at this offset) could have added
 	 * overlapping blocks.
 	 */
-	if (XFS_WPC(wpc)->data_seq != READ_ONCE(ip->i_df.if_seq))
+	if (XFS_WPC(wpc)->data_seq != READ_ONCE(ip->i_df.if_seq)) {
+		XFS_ERRORTAG_REPORT(ip->i_mount, XFS_ERRTAG_WB_DELAY_MS);
 		return false;
+	}
 	if (xfs_inode_has_cow_data(ip) &&
-	    XFS_WPC(wpc)->cow_seq != READ_ONCE(ip->i_cowfp->if_seq))
+	    XFS_WPC(wpc)->cow_seq != READ_ONCE(ip->i_cowfp->if_seq)) {
+		XFS_ERRORTAG_REPORT(ip->i_mount, XFS_ERRTAG_WB_DELAY_MS);
 		return false;
+	}
 	return true;
 }
 
@@ -285,6 +291,8 @@ xfs_map_blocks(
 	if (xfs_is_shutdown(mp))
 		return -EIO;
 
+	XFS_ERRORTAG_DELAY(mp, XFS_ERRTAG_WB_DELAY_MS);
+
 	/*
 	 * COW fork blocks can overlap data fork blocks even if the blocks
 	 * aren't shared.  COW I/O always takes precedent, so we must always
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index dea3c0649d2f..13ac52e7f9e5 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -60,6 +60,7 @@ static unsigned int xfs_errortag_random_default[] = {
 	XFS_RANDOM_LARP,
 	XFS_RANDOM_DA_LEAF_SPLIT,
 	XFS_RANDOM_ATTR_LEAF_TO_NODE,
+	XFS_RANDOM_WB_DELAY_MS,
 };
 
 struct xfs_errortag_attr {
@@ -175,6 +176,7 @@ XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
 XFS_ERRORTAG_ATTR_RW(larp,		XFS_ERRTAG_LARP);
 XFS_ERRORTAG_ATTR_RW(da_leaf_split,	XFS_ERRTAG_DA_LEAF_SPLIT);
 XFS_ERRORTAG_ATTR_RW(attr_leaf_to_node,	XFS_ERRTAG_ATTR_LEAF_TO_NODE);
+XFS_ERRORTAG_ATTR_RW(wb_delay_ms,	XFS_ERRTAG_WB_DELAY_MS);
 
 static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -218,6 +220,7 @@ static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(larp),
 	XFS_ERRORTAG_ATTR_LIST(da_leaf_split),
 	XFS_ERRORTAG_ATTR_LIST(attr_leaf_to_node),
+	XFS_ERRORTAG_ATTR_LIST(wb_delay_ms),
 	NULL,
 };
 ATTRIBUTE_GROUPS(xfs_errortag);
@@ -267,6 +270,14 @@ xfs_errortag_valid(
 	return true;
 }
 
+bool
+xfs_errortag_enabled(
+	struct xfs_mount	*mp,
+	unsigned int		tag)
+{
+	return mp->m_errortag && mp->m_errortag[tag] != 0;
+}
+
 bool
 xfs_errortag_test(
 	struct xfs_mount	*mp,
diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index 5191e9145e55..15baa5428e1a 100644
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -45,6 +45,26 @@ extern bool xfs_errortag_test(struct xfs_mount *mp, const char *expression,
 		const char *file, int line, unsigned int error_tag);
 #define XFS_TEST_ERROR(expr, mp, tag)		\
 	((expr) || xfs_errortag_test((mp), #expr, __FILE__, __LINE__, (tag)))
+bool xfs_errortag_enabled(struct xfs_mount *mp, unsigned int tag);
+#define XFS_ERRORTAG_REPORT(mp, tag)		\
+	do { \
+		if (!xfs_errortag_enabled((mp), (tag))) \
+			break; \
+		xfs_warn((mp), \
+"Injected errortag (%s) set to %u at file %s, line %d, on filesystem \"%s\"", \
+				#tag, (mp)->m_errortag[(tag)], \
+				__FILE__, __LINE__, (mp)->m_super->s_id); \
+	} while (0)
+#define XFS_ERRORTAG_DELAY(mp, tag)		\
+	do { \
+		if (!xfs_errortag_enabled((mp), (tag))) \
+			break; \
+		xfs_warn_ratelimited((mp), \
+"Injecting %ums delay at file %s, line %d, on filesystem \"%s\"", \
+				(mp)->m_errortag[(tag)], __FILE__, __LINE__, \
+				(mp)->m_super->s_id); \
+		mdelay((mp)->m_errortag[(tag)]); \
+	} while (0)
 
 extern int xfs_errortag_get(struct xfs_mount *mp, unsigned int error_tag);
 extern int xfs_errortag_set(struct xfs_mount *mp, unsigned int error_tag,
@@ -55,6 +75,8 @@ extern int xfs_errortag_clearall(struct xfs_mount *mp);
 #define xfs_errortag_init(mp)			(0)
 #define xfs_errortag_del(mp)
 #define XFS_TEST_ERROR(expr, mp, tag)		(expr)
+#define XFS_ERRORTAG_REPORT(mp, tag)		((void)0)
+#define XFS_ERRORTAG_DELAY(mp, tag)		((void)0)
 #define xfs_errortag_set(mp, tag, val)		(ENOSYS)
 #define xfs_errortag_add(mp, tag)		(ENOSYS)
 #define xfs_errortag_clearall(mp)		(ENOSYS)
