row0sel.c:

  If innodb_force_recovery >= 5, do not try to fetch an old version of a clustered index record: this reduces crashes when dumping tables from a corrupt database


innobase/row/row0sel.c:
  If innodb_force_recovery >= 5, do not try to fetch an old version of a clustered index record: this reduces crashes when dumping tables from a corrupt database

innobase/row/row0sel.c

@@ -3222,8 +3222,14 @@ rec_loop:
 			latest version of the record */
 		
 		} else if (index == clust_index) {
-			
-			if (!lock_clust_rec_cons_read_sees(rec, index,
+			  
+			/* Fetch a previous version of the row if the current
+			one is not visible in the snapshot; if we have a very
+			high force recovery level set, we try to avoid crashes
+			by skipping this lookup */
+
+			if (srv_force_recovery < 5
+                            && !lock_clust_rec_cons_read_sees(rec, index,
 							trx->read_view)) {
 
 				err = row_sel_build_prev_vers_for_mysql(