Update

vendor/gvisor.dev/gvisor/pkg/waiter/waiter.go

@@ -154,6 +154,15 @@ func (e *Entry) Init(eventListener EventListener, mask EventMask) {
 	e.mask = mask
 }
 
+// SetQueuedMask changes the entry mask.
+//
+// Preconditions: The Entry must be registered to the given Queue.
+func (e *Entry) SetQueuedMask(q *Queue, mask EventMask) {
+	q.mu.Lock()
+	e.mask = mask
+	q.mu.Unlock()
+}
+
 // Mask returns the entry mask.
 func (e *Entry) Mask() EventMask {
 	return e.mask
@@ -201,6 +210,14 @@ func NewFunctionEntry(mask EventMask, fn func(EventMask)) (e Entry) {
 	return e
 }
 
+// NoopListener is an EventListener that does nothing.
+//
+// +stateify savable
+type NoopListener struct{}
+
+// NotifyEvent implements EventListener.NotifyEvent.
+func (NoopListener) NotifyEvent(mask EventMask) {}
+
 // Queue represents the wait queue where waiters can be added and
 // notifiers can notify them when events happen.
 //

vendor/gvisor.dev/gvisor/pkg/waiter/waiter_state_autogen.go

@@ -39,6 +39,27 @@ func (e *Entry) StateLoad(ctx context.Context, stateSourceObject state.Source) {
 	stateSourceObject.Load(2, &e.mask)
 }
 
+func (n *NoopListener) StateTypeName() string {
+	return "pkg/waiter.NoopListener"
+}
+
+func (n *NoopListener) StateFields() []string {
+	return []string{}
+}
+
+func (n *NoopListener) beforeSave() {}
+
+// +checklocksignore
+func (n *NoopListener) StateSave(stateSinkObject state.Sink) {
+	n.beforeSave()
+}
+
+func (n *NoopListener) afterLoad(context.Context) {}
+
+// +checklocksignore
+func (n *NoopListener) StateLoad(ctx context.Context, stateSourceObject state.Source) {
+}
+
 func (q *Queue) StateTypeName() string {
 	return "pkg/waiter.Queue"
 }
@@ -122,6 +143,7 @@ func (e *waiterEntry) StateLoad(ctx context.Context, stateSourceObject state.Sou
 
 func init() {
 	state.Register((*Entry)(nil))
+	state.Register((*NoopListener)(nil))
 	state.Register((*Queue)(nil))
 	state.Register((*waiterList)(nil))
 	state.Register((*waiterEntry)(nil))