Avoid marking possibly freed stack;
MODIFY
src/gc.c
src/gc.c
@@ -648,9 +648,12 @@ gc_mark_children(mrb_state *mrb, mrb_gc *gc, struct RBasic *obj)
struct REnv *e = (struct REnv*)obj;
mrb_int i, len;
- if (MRB_ENV_STACK_SHARED_P(e) && e->cxt.c->fib) {
+ if (MRB_ENV_STACK_SHARED_P(e)) {
+ if (e->cxt.c->fib) {
mrb_gc_mark(mrb, (struct RBasic*)e->cxt.c->fib);
}
+ break;
+ }
len = MRB_ENV_STACK_LEN(e);
for (i=0; i<len; i++) {
mrb_gc_mark_value(mrb, e->stack[i]);

Avoid marking possibly freed stack; #3550 #3612