diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 588c1ec536..bad698c125 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -1416,6 +1416,20 @@ ExecuteTruncate(TruncateStmt *stmt)
 
 				/* find_all_inheritors already got lock */
 				rel = heap_open(childrelid, NoLock);
+
+				/*
+				 * It is possible that the parent table has children that are
+				 * temp tables of other backends.  We cannot safely access
+				 * such tables (because of buffering issues), and the best
+				 * thing to do seems to be to silently ignore them.  No point
+				 * in holding onto the lock either.
+				 */
+				if (RELATION_IS_OTHER_TEMP(rel))
+				{
+					heap_close(rel, AccessExclusiveLock);
+					continue;
+				}
+
 				truncate_check_rel(RelationGetRelid(rel), rel->rd_rel);
 				truncate_check_activity(rel);