worker: fix crash when a worker joins after exit

Qard · ruyadorno · commit bfd11d766197 · 2025-01-05T13:05:26.000-05:00
If a worker has not already joined before running to completion it will join in a SetImmediateThreadsafe which could occur after the worker has already ended by other means. Mutating a JS object at that point would fail because the isolate is already disposed. PR-URL: #56191 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
diff --git a/src/node_worker.cc b/src/node_worker.cc
@@ -449,6 +449,9 @@ void Worker::JoinThread() {
 
   env()->remove_sub_worker_context(this);
 
+  // Join may happen after the worker exits and disposes the isolate
+  if (!env()->can_call_into_js()) return;
+
   {
     HandleScope handle_scope(env()->isolate());
     Context::Scope context_scope(env()->context());
