1 files changed, 2 insertions, 5 deletions
diff --git a/src/mscorlib/src/System/Threading/Tasks/ThreadPoolTaskScheduler.cs b/src/mscorlib/src/System/Threading/Tasks/ThreadPoolTaskScheduler.cs
index dd4cbc9a66..5c6ca9bb76 100644
--- a/src/mscorlib/src/System/Threading/Tasks/ThreadPoolTaskScheduler.cs
+++ b/src/mscorlib/src/System/Threading/Tasks/ThreadPoolTaskScheduler.cs
@@ -13,6 +13,7 @@
 
 using System;
 using System.Security;
+using System.Diagnostics;
 using System.Diagnostics.Contracts;
 using System.Collections.Generic;
 using System.Text;
@@ -39,7 +40,7 @@ namespace System.Threading.Tasks
         {
             Contract.Requires(obj != null, "TaskScheduler.LongRunningThreadWork: obj is null");
             Task t = obj as Task;
-            Contract.Assert(t != null, "TaskScheduler.LongRunningThreadWork: t is null");
+            Debug.Assert(t != null, "TaskScheduler.LongRunningThreadWork: t is null");
             t.ExecuteEntry(false);
         }
 
@@ -47,7 +48,6 @@ namespace System.Threading.Tasks
         /// Schedules a task to the ThreadPool.
         /// </summary>
         /// <param name="task">The task to schedule.</param>
-        [SecurityCritical]
         protected internal override void QueueTask(Task task)
         {
             if ((task.Options & TaskCreationOptions.LongRunning) != 0)
@@ -73,7 +73,6 @@ namespace System.Threading.Tasks
         /// IMPORTANT NOTE: TryExecuteTaskInline will NOT throw task exceptions itself. Any wait code path using this function needs
         /// to account for exceptions that need to be propagated, and throw themselves accordingly.
         /// </summary>
-        [SecurityCritical]
         protected override bool TryExecuteTaskInline(Task task, bool taskWasPreviouslyQueued)
         {
             // If the task was previously scheduled, and we can't pop it, then return false.
@@ -95,14 +94,12 @@ namespace System.Threading.Tasks
             return rval;
         }
 
-        [SecurityCritical]
         protected internal override bool TryDequeue(Task task)
         {
             // just delegate to TP
             return ThreadPool.TryPopCustomWorkItem(task);
         }
 
-        [SecurityCritical]
         protected override IEnumerable<Task> GetScheduledTasks()
         {
             return FilterTasksFromWorkItems(ThreadPool.GetQueuedWorkItems());