Index: e2fsprogs-1.40.4/e2fsck/super.c
===================================================================
--- e2fsprogs-1.40.4.orig/e2fsck/super.c
+++ e2fsprogs-1.40.4/e2fsck/super.c
@@ -814,10 +814,32 @@ int check_backup_super_block(e2fsck_t ct
 			continue;
 		}
 
-#define SUPER_DIFFERENT(x) (fs->super->x != tfs->super->x)
-		if (SUPER_DIFFERENT(s_feature_compat) ||
-		    SUPER_DIFFERENT(s_feature_incompat) ||
-		    SUPER_DIFFERENT(s_feature_ro_compat) ||
+		/*
+		 * A few flags are set on the fly by the kernel, but
+		 * only in the primary superblock.  They are safe
+	 	 * to copy even if they differ.
+	 	 */ 
+
+#define FEATURE_COMPAT_IGNORE		(EXT2_FEATURE_COMPAT_EXT_ATTR)
+#define FEATURE_RO_COMPAT_IGNORE	(EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
+					 EXT4_FEATURE_RO_COMPAT_DIR_NLINK)
+#define FEATURE_INCOMPAT_IGNORE		(EXT3_FEATURE_INCOMPAT_EXTENTS)
+
+#define SUPER_COMPAT_DIFFERENT(x)	\
+	(( fs->super->x & ~FEATURE_COMPAT_IGNORE) !=	\
+	 (tfs->super->x & ~FEATURE_COMPAT_IGNORE))
+#define SUPER_INCOMPAT_DIFFERENT(x)	\
+	(( fs->super->x & ~FEATURE_INCOMPAT_IGNORE) !=	\
+	 (tfs->super->x & ~FEATURE_INCOMPAT_IGNORE))
+#define SUPER_RO_COMPAT_DIFFERENT(x)	\
+	(( fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) !=	\
+	 (tfs->super->x & ~FEATURE_RO_COMPAT_IGNORE))
+#define SUPER_DIFFERENT(x)		\
+	(fs->super->x != tfs->super->x)
+
+		if (SUPER_COMPAT_DIFFERENT(s_feature_compat) ||
+		    SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) ||
+		    SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) ||
 		    SUPER_DIFFERENT(s_blocks_count) ||
 		    SUPER_DIFFERENT(s_inodes_count) ||
 		    memcmp(fs->super->s_uuid, tfs->super->s_uuid,