diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AppendPrepend.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AppendPrepend.cs
index 2225f3c..6738858 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AppendPrepend.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AppendPrepend.cs
@@ -65,6 +65,8 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.element = element;
                 this.state = append ? State.RequireAppend : State.RequirePrepend;
                 this.cancellationToken = cancellationToken;
+
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -136,6 +138,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AsyncEnumeratorBase.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AsyncEnumeratorBase.cs
index 3f3ba2f..b34516c 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AsyncEnumeratorBase.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AsyncEnumeratorBase.cs
@@ -76,6 +76,7 @@ namespace Cysharp.Threading.Tasks.Linq
         {
             this.source = source;
             this.cancellationToken = cancellationToken;
+            TaskTracker.TrackActiveTask(this, 4);
         }
 
         // abstract
@@ -178,6 +179,7 @@ namespace Cysharp.Threading.Tasks.Linq
         // if require additional resource to dispose, override and call base.DisposeAsync.
         public virtual UniTask DisposeAsync()
         {
+            TaskTracker.RemoveTracking(this);
             if (enumerator != null)
             {
                 return enumerator.DisposeAsync();
@@ -204,6 +206,7 @@ namespace Cysharp.Threading.Tasks.Linq
         {
             this.source = source;
             this.cancellationToken = cancellationToken;
+            TaskTracker.TrackActiveTask(this, 4);
         }
 
         // abstract
@@ -399,6 +402,7 @@ namespace Cysharp.Threading.Tasks.Linq
         // if require additional resource to dispose, override and call base.DisposeAsync.
         public virtual UniTask DisposeAsync()
         {
+            TaskTracker.RemoveTracking(this);
             if (enumerator != null)
             {
                 return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Buffer.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Buffer.cs
index be666b8..be395b6 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Buffer.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Buffer.cs
@@ -61,6 +61,8 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.source = source;
                 this.count = count;
                 this.cancellationToken = cancellationToken;
+
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public IList<TSource> Current { get; private set; }
@@ -167,6 +169,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
@@ -217,6 +220,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.count = count;
                 this.skip = skip;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public IList<TSource> Current { get; private set; }
@@ -329,6 +333,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Concat.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Concat.cs
index e087f98..715795e 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Concat.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Concat.cs
@@ -57,6 +57,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.second = second;
                 this.cancellationToken = cancellationToken;
                 this.iteratingState = IteratingState.IteratingFirst;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -150,6 +151,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/DefaultIfEmpty.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/DefaultIfEmpty.cs
index da3be3f..3d21bd7 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/DefaultIfEmpty.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/DefaultIfEmpty.cs
@@ -63,6 +63,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.cancellationToken = cancellationToken;
 
                 this.iteratingState = IteratingState.Empty;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -128,6 +129,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Do.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Do.cs
index a1d7b12..f6df368 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Do.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Do.cs
@@ -124,6 +124,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.onError = onError;
                 this.onCompleted = onCompleted;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -244,6 +245,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupBy.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupBy.cs
index 672dce7..b9460ae 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupBy.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupBy.cs
@@ -255,6 +255,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.elementSelector = elementSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public IGrouping<TKey, TElement> Current { get; private set; }
@@ -313,6 +314,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (groupEnumerator != null)
                 {
                     groupEnumerator.Dispose();
@@ -364,6 +366,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -423,6 +426,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (groupEnumerator != null)
                 {
                     groupEnumerator.Dispose();
@@ -470,6 +474,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.elementSelector = elementSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public IGrouping<TKey, TElement> Current { get; private set; }
@@ -528,6 +533,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (groupEnumerator != null)
                 {
                     groupEnumerator.Dispose();
@@ -582,6 +588,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -661,6 +668,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (groupEnumerator != null)
                 {
                     groupEnumerator.Dispose();
@@ -708,6 +716,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.elementSelector = elementSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public IGrouping<TKey, TElement> Current { get; private set; }
@@ -766,6 +775,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (groupEnumerator != null)
                 {
                     groupEnumerator.Dispose();
@@ -820,6 +830,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -899,6 +910,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (groupEnumerator != null)
                 {
                     groupEnumerator.Dispose();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupJoin.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupJoin.cs
index b048132..607b221 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupJoin.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/GroupJoin.cs
@@ -129,6 +129,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -208,6 +209,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
@@ -273,6 +275,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -401,6 +404,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
@@ -466,6 +470,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -594,6 +599,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Join.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Join.cs
index daf120c..2d80889 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Join.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Join.cs
@@ -131,6 +131,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -248,6 +249,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (valueEnumerator != null)
                 {
                     valueEnumerator.Dispose();
@@ -321,6 +323,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -476,6 +479,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (valueEnumerator != null)
                 {
                     valueEnumerator.Dispose();
@@ -549,6 +553,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.resultSelector = resultSelector;
                 this.comparer = comparer;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -704,6 +709,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (valueEnumerator != null)
                 {
                     valueEnumerator.Dispose();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/OrderBy.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/OrderBy.cs
index ea58e72..d0c379f 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/OrderBy.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/OrderBy.cs
@@ -422,6 +422,7 @@ namespace Cysharp.Threading.Tasks.Linq
             {
                 this.parent = parent;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TElement Current { get; private set; }
@@ -477,6 +478,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 return default;
             }
         }
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Queue.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Queue.cs
index 032c3ce..b5c221f 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Queue.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Queue.cs
@@ -33,6 +33,7 @@ namespace Cysharp.Threading.Tasks.Linq
             Channel<TSource> channel;
             IUniTaskAsyncEnumerator<TSource> channelEnumerator;
             IUniTaskAsyncEnumerator<TSource> sourceEnumerator;
+            bool channelClosed;
 
             public _Queue(IUniTaskAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
             {
@@ -53,13 +54,13 @@ namespace Cysharp.Threading.Tasks.Linq
 
                     channelEnumerator = channel.Reader.ReadAllAsync().GetAsyncEnumerator(cancellationToken);
 
-                    ConsumeAll(sourceEnumerator, channel).Forget();
+                    ConsumeAll(this, sourceEnumerator, channel).Forget();
                 }
 
                 return channelEnumerator.MoveNextAsync();
             }
 
-            static async UniTaskVoid ConsumeAll(IUniTaskAsyncEnumerator<TSource> enumerator, ChannelWriter<TSource> writer)
+            static async UniTaskVoid ConsumeAll(_Queue self, IUniTaskAsyncEnumerator<TSource> enumerator, ChannelWriter<TSource> writer)
             {
                 try
                 {
@@ -75,6 +76,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 }
                 finally
                 {
+                    self.channelClosed = true;
                     await enumerator.DisposeAsync();
                 }
             }
@@ -89,6 +91,12 @@ namespace Cysharp.Threading.Tasks.Linq
                 {
                     await channelEnumerator.DisposeAsync();
                 }
+
+                if (!channelClosed)
+                {
+                    channelClosed = true;
+                    channel.Writer.TryComplete(new OperationCanceledException());
+                }
             }
         }
     }
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Reverse.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Reverse.cs
index a4912e1..48d4318 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Reverse.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Reverse.cs
@@ -40,6 +40,7 @@ namespace Cysharp.Threading.Tasks.Linq
             {
                 this.source = source;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -69,6 +70,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 return default;
             }
         }
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SelectMany.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SelectMany.cs
index 40db646..6cad2a5 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SelectMany.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SelectMany.cs
@@ -160,6 +160,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.selector2 = selector2;
                 this.resultSelector = resultSelector;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -324,6 +325,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public async UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (selectedEnumerator != null)
                 {
                     await selectedEnumerator.DisposeAsync();
@@ -398,6 +400,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.selector2 = selector2;
                 this.resultSelector = resultSelector;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -598,6 +601,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public async UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (selectedEnumerator != null)
                 {
                     await selectedEnumerator.DisposeAsync();
@@ -672,6 +676,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.selector2 = selector2;
                 this.resultSelector = resultSelector;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -872,6 +877,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public async UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (selectedEnumerator != null)
                 {
                     await selectedEnumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipLast.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipLast.cs
index 7b2dbc1..9d127b8 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipLast.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipLast.cs
@@ -56,6 +56,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.source = source;
                 this.count = count;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -146,6 +147,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntilCanceled.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntilCanceled.cs
index 2c7f653..f8c2b30 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntilCanceled.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntilCanceled.cs
@@ -48,6 +48,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.source = source;
                 this.cancellationToken1 = cancellationToken1;
                 this.cancellationToken2 = cancellationToken2;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -131,6 +132,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Take.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Take.cs
index be24ca7..6cd4eda 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Take.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Take.cs
@@ -47,6 +47,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.source = source;
                 this.count = count;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -111,6 +112,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeLast.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeLast.cs
index ae93ec8..ca0084e 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeLast.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeLast.cs
@@ -57,6 +57,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.source = source;
                 this.count = count;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -162,6 +163,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeUntilCanceled.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeUntilCanceled.cs
index 8604bf7..67ee3c8 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeUntilCanceled.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeUntilCanceled.cs
@@ -61,6 +61,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 {
                     this.cancellationTokenRegistration2 = cancellationToken2.RegisterWithoutCaptureExecutionContext(CancelDelegate2, this);
                 }
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TSource Current { get; private set; }
@@ -149,6 +150,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 cancellationTokenRegistration1.Dispose();
                 cancellationTokenRegistration2.Dispose();
                 if (enumerator != null)
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Zip.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Zip.cs
index 41de303..af6d5f1 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Zip.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Zip.cs
@@ -84,6 +84,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.second = second;
                 this.resultSelector = resultSelector;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -181,6 +182,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public async UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (firstEnumerator != null)
                 {
                     await firstEnumerator.DisposeAsync();
@@ -236,6 +238,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.second = second;
                 this.resultSelector = resultSelector;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -351,6 +354,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public async UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (firstEnumerator != null)
                 {
                     await firstEnumerator.DisposeAsync();
@@ -406,6 +410,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.second = second;
                 this.resultSelector = resultSelector;
                 this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
             public TResult Current { get; private set; }
@@ -521,6 +526,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public async UniTask DisposeAsync()
             {
+                TaskTracker.RemoveTracking(this);
                 if (firstEnumerator != null)
                 {
                     await firstEnumerator.DisposeAsync();
diff --git a/src/UniTask/Assets/Scenes/SandboxMain.cs b/src/UniTask/Assets/Scenes/SandboxMain.cs
index 6e7a906..512a600 100644
--- a/src/UniTask/Assets/Scenes/SandboxMain.cs
+++ b/src/UniTask/Assets/Scenes/SandboxMain.cs
@@ -190,7 +190,7 @@ public class SandboxMain : MonoBehaviour
         Debug.Log("Done");
     }
 
-    async UniTaskVoid Start()
+    void Start()
     {
         //var rp = new AsyncReactiveProperty<int>(10);
 
@@ -200,11 +200,15 @@ public class SandboxMain : MonoBehaviour
 
         //rp.Dispose();
 
-        var channel = Channel.CreateSingleConsumerUnbounded<int>();
-        Debug.Log("wait channel");
-        await channel.Reader.ReadAllAsync(this.GetCancellationTokenOnDestroy()).ForEachAsync(_ => { });
+        //var channel = Channel.CreateSingleConsumerUnbounded<int>();
+        //Debug.Log("wait channel");
+        //await channel.Reader.ReadAllAsync(this.GetCancellationTokenOnDestroy()).ForEachAsync(_ => { });
 
 
+        var rp = new AsyncReactiveProperty<int>(10);
+
+        rp.Append(10).Select(x => x * 100).Take(30).Prepend(99).SkipLast(9).Where(x => x % 2 == 0).ForEachAsync(_ => { }).Forget();
+
     }
 
     async UniTaskVoid Running(CancellationToken ct)