Add write barrier for hash in obj_traverse_i

jhawthorn · k0kubun · commit c2bda5c359fd · 2025-09-05T09:05:06.000-07:00
We are inserting directly into the st_table, so we need to issue a write
barrier from the hash.
diff --git a/ractor.c b/ractor.c
@@ -2911,6 +2911,7 @@ obj_traverse_i(VALUE obj, struct obj_traverse_data *data)
         // already traversed
         return 0;
     }
+    RB_OBJ_WRITTEN(data->rec_hash, Qundef, obj);
 
     struct obj_traverse_callback_data d = {
         .stop = false,
@@ -3357,6 +3358,8 @@ obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data)
     }
     else {
         st_insert(obj_traverse_replace_rec(data), (st_data_t)obj, replacement);
+        RB_OBJ_WRITTEN(data->rec_hash, Qundef, obj);
+        RB_OBJ_WRITTEN(data->rec_hash, Qundef, replacement);
     }
 
     if (!data->move) {

Original file line number	Diff line number	Diff line change
`@@ -2911,6 +2911,7 @@ obj_traverse_i(VALUE obj, struct obj_traverse_data *data)`
`2911`	`2911`	`// already traversed`
`2912`	`2912`	`return 0;`
`2913`	`2913`	`}`
	`2914`	`+ RB_OBJ_WRITTEN(data->rec_hash, Qundef, obj);`
`2914`	`2915`
`2915`	`2916`	`struct obj_traverse_callback_data d = {`
`2916`	`2917`	`.stop = false,`
`@@ -3357,6 +3358,8 @@ obj_traverse_replace_i(VALUE obj, struct obj_traverse_replace_data *data)`
`3357`	`3358`	`}`
`3358`	`3359`	`else {`
`3359`	`3360`	`st_insert(obj_traverse_replace_rec(data), (st_data_t)obj, replacement);`
	`3361`	`+ RB_OBJ_WRITTEN(data->rec_hash, Qundef, obj);`
	`3362`	`+ RB_OBJ_WRITTEN(data->rec_hash, Qundef, replacement);`
`3360`	`3363`	`}`
`3361`	`3364`
`3362`	`3365`	`if (!data->move) {`