Give the busyobj a copy (+ref) of the req's vcl and director.

bin/varnishd/cache/cache.h

@@ -539,6 +539,8 @@ struct busyobj {
 	double			between_bytes_timeout;
 
 	const char		*storage_hint;
+	struct director		*director;
+	struct VCL_conf		*vcl;
 
 	struct vsl_log		vsl[1];
 	struct dstat		*stats;

bin/varnishd/cache/cache_busyobj.c

@@ -141,6 +141,10 @@ VBO_GetBusyObj(struct worker *wrk, struct req *req)
 
 	bo->do_stream = 1;
 
+	bo->director = req->director;
+	bo->vcl = req->vcl;
+	VCL_Ref(bo->vcl);
+
 	return (bo);
 }
 
@@ -183,6 +187,8 @@ VBO_DerefBusyObj(struct worker *wrk, struct busyobj **pbo)
 		(void)HSH_Deref(&wrk->stats, NULL, &bo->fetch_obj);
 	}
 
+	VCL_Rel(&bo->vcl);
+
 	memset(&bo->refcount, 0,
 	    sizeof *bo - offsetof(struct busyobj, refcount));