Don't enqueue to a terminated worker's freed event loop from other threads

src/bundler/ParseTask.rs

@@ -2810,14 +2810,15 @@ pub mod parse_worker {
             .any_loop_mut()
             .expect("BundleV2.linker.loop must be set before scheduling ParseTask")
         {
-            bun_event_loop::AnyEventLoop::Js { owner } => {
+            bun_event_loop::AnyEventLoop::Js { owner, generation } => {
                 owner.enqueue_task_concurrent(
                     bun_event_loop::ConcurrentTask::ConcurrentTask::from_callback(result, |p| {
                         // SAFETY: `p` is the `result` Box leaked above; ownership
                         // transfers to `on_complete`, which deallocates it.
                         unsafe { on_complete(p) };
                         Ok(())
                     }),
+                    *generation,
                 );
             }
             bun_event_loop::AnyEventLoop::Mini(mini) => {

src/bundler/ServerComponentParseTask.rs

@@ -121,14 +121,15 @@ fn task_callback_wrap(thread_pool_task: *mut ThreadPoolTask) {
         .any_loop_mut()
         .expect("BundleV2.linker.loop must be set before scheduling ServerComponentParseTask")
     {
-        bun_event_loop::AnyEventLoop::Js { owner } => {
+        bun_event_loop::AnyEventLoop::Js { owner, generation } => {
             owner.enqueue_task_concurrent(
                 bun_event_loop::ConcurrentTask::ConcurrentTask::from_callback(result, |p| {
                     // SAFETY: `p` is the `result` Box leaked above; ownership
                     // transfers to `on_complete`, which deallocates it.
                     unsafe { on_complete(p) };
                     Ok(())
                 }),
+                *generation,
             );
         }
         bun_event_loop::AnyEventLoop::Mini(mini) => {

src/bundler/bundle_v2.rs

@@ -1566,8 +1566,8 @@ pub mod bv2_impl {
             // the plugins.
             // `any_loop_mut` centralises the BACKREF deref of `linker.r#loop`.
             match &*self.any_loop_mut() {
-                bun_event_loop::AnyEventLoop::Js { owner } => {
-                    owner.enqueue_task_concurrent(task);
+                bun_event_loop::AnyEventLoop::Js { owner, generation } => {
+                    owner.enqueue_task_concurrent(task, *generation);
                 }
                 bun_event_loop::AnyEventLoop::Mini(_) => {
                     panic!("No JavaScript event loop for transpiler plugins to run on");
@@ -4205,12 +4205,13 @@ pub mod bv2_impl {
             // `on_load` must land there — not on the JS plugin loop — or it will
             // mutate `graph` / allocate from `graph.heap` off-thread.
             match self.any_loop_mut() {
-                bun_event_loop::AnyEventLoop::Js { owner } => {
+                bun_event_loop::AnyEventLoop::Js { owner, generation } => {
                     owner.enqueue_task_concurrent(
                         bun_event_loop::ConcurrentTask::ConcurrentTask::from_callback(
                             std::ptr::from_mut(load),
                             on_load_from_js_loop_raw,
                         ),
+                        *generation,
                     );
                 }
                 bun_event_loop::AnyEventLoop::Mini(mini) => {
@@ -4230,12 +4231,13 @@ pub mod bv2_impl {
         pub fn on_resolve_async(&mut self, resolve: &mut jsc_api::JSBundler::Resolve) {
             // See `on_load_async` — must dispatch on the bundler's own loop.
             match self.any_loop_mut() {
-                bun_event_loop::AnyEventLoop::Js { owner } => {
+                bun_event_loop::AnyEventLoop::Js { owner, generation } => {
                     owner.enqueue_task_concurrent(
                         bun_event_loop::ConcurrentTask::ConcurrentTask::from_callback(
                             std::ptr::from_mut(resolve),
                             on_resolve_from_js_loop_raw,
                         ),
+                        *generation,
                     );
                 }
                 bun_event_loop::AnyEventLoop::Mini(mini) => {