Program: 191574
Project: 191574
Buggy source:
/** 
 * Returns a list of the recents tasks.
 * @param isHomeStackVisible whether or not the home stack is currently visible.  If it isvisible, then we ignore all excluded tasks (even the first one).
 */
public List<ActivityManager.RecentTaskInfo> getRecentTasks(int numLatestTasks,int userId,boolean isHomeStackVisible,ArraySet<Integer> quietProfileIds){
  if (mAm == null)   return null;
  if (RecentsDebugFlags.Static.EnableMockTasks) {
    ArrayList<ActivityManager.RecentTaskInfo> tasks=new ArrayList<ActivityManager.RecentTaskInfo>();
    int count=Math.min(numLatestTasks,RecentsDebugFlags.Static.MockTaskCount);
    for (int i=0; i < count; i++) {
      int packageIndex=i % RecentsDebugFlags.Static.MockTasksPackageCount;
      ComponentName cn=new ComponentName("String_Node_Str" + packageIndex,"String_Node_Str" + i + "String_Node_Str");
      String description="String_Node_Str" + i + "String_Node_Str"+ Long.toString(Math.abs(new Random().nextLong()),36);
      ActivityManager.RecentTaskInfo rti=new ActivityManager.RecentTaskInfo();
      rti.id=rti.persistentId=rti.affiliatedTaskId=i;
      rti.baseIntent=new Intent();
      rti.baseIntent.setComponent(cn);
      rti.description=description;
      rti.firstActiveTime=rti.lastActiveTime=i;
      if (i % 2 == 0) {
        rti.taskDescription=new ActivityManager.TaskDescription(description,Bitmap.createBitmap(mDummyIcon),null,0xFF000000 | (0xFFFFFF & new Random().nextInt()),0xFF000000 | (0xFFFFFF & new Random().nextInt()));
      }
 else {
        rti.taskDescription=new ActivityManager.TaskDescription();
      }
      tasks.add(rti);
    }
    return tasks;
  }
  int minNumTasksToQuery=10;
  int numTasksToQuery=Math.max(minNumTasksToQuery,numLatestTasks);
  List<ActivityManager.RecentTaskInfo> tasks=mAm.getRecentTasksForUser(numTasksToQuery,ActivityManager.RECENT_IGNORE_HOME_STACK_TASKS | ActivityManager.RECENT_INGORE_DOCKED_STACK_TOP_TASK | ActivityManager.RECENT_INGORE_PINNED_STACK_TASKS| ActivityManager.RECENT_IGNORE_UNAVAILABLE| ActivityManager.RECENT_INCLUDE_PROFILES| ActivityManager.RECENT_WITH_EXCLUDED,userId);
  if (tasks == null) {
    return new ArrayList<>();
  }
  boolean isFirstValidTask=true;
  Iterator<ActivityManager.RecentTaskInfo> iter=tasks.iterator();
  while (iter.hasNext()) {
    ActivityManager.RecentTaskInfo t=iter.next();
    boolean isExcluded=(t.baseIntent.getFlags() & Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS) == Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS;
    boolean isBlackListed=sRecentsBlacklist.contains(t.realActivity.getClassName());
    isExcluded|=quietProfileIds.contains(t.userId);
    if (isBlackListed || (isExcluded && (isHomeStackVisible || !isFirstValidTask))) {
      iter.remove();
      continue;
    }
    isFirstValidTask=false;
  }
  return tasks.subList(0,Math.min(tasks.size(),numLatestTasks));
}

Fixed version (ground truth):
/** 
 * Returns a list of the recents tasks.
 * @param includeFrontMostExcludedTask if set, will ensure that the front most excluded taskwill be visible, otherwise no excluded tasks will be visible.
 */
public List<ActivityManager.RecentTaskInfo> getRecentTasks(int numLatestTasks,int userId,boolean includeFrontMostExcludedTask,ArraySet<Integer> quietProfileIds){
  if (mAm == null)   return null;
  if (RecentsDebugFlags.Static.EnableMockTasks) {
    ArrayList<ActivityManager.RecentTaskInfo> tasks=new ArrayList<ActivityManager.RecentTaskInfo>();
    int count=Math.min(numLatestTasks,RecentsDebugFlags.Static.MockTaskCount);
    for (int i=0; i < count; i++) {
      int packageIndex=i % RecentsDebugFlags.Static.MockTasksPackageCount;
      ComponentName cn=new ComponentName("String_Node_Str" + packageIndex,"String_Node_Str" + i + "String_Node_Str");
      String description="String_Node_Str" + i + "String_Node_Str"+ Long.toString(Math.abs(new Random().nextLong()),36);
      ActivityManager.RecentTaskInfo rti=new ActivityManager.RecentTaskInfo();
      rti.id=rti.persistentId=rti.affiliatedTaskId=i;
      rti.baseIntent=new Intent();
      rti.baseIntent.setComponent(cn);
      rti.description=description;
      rti.firstActiveTime=rti.lastActiveTime=i;
      if (i % 2 == 0) {
        rti.taskDescription=new ActivityManager.TaskDescription(description,Bitmap.createBitmap(mDummyIcon),null,0xFF000000 | (0xFFFFFF & new Random().nextInt()),0xFF000000 | (0xFFFFFF & new Random().nextInt()));
      }
 else {
        rti.taskDescription=new ActivityManager.TaskDescription();
      }
      tasks.add(rti);
    }
    return tasks;
  }
  int minNumTasksToQuery=10;
  int numTasksToQuery=Math.max(minNumTasksToQuery,numLatestTasks);
  int flags=ActivityManager.RECENT_IGNORE_HOME_STACK_TASKS | ActivityManager.RECENT_INGORE_DOCKED_STACK_TOP_TASK | ActivityManager.RECENT_INGORE_PINNED_STACK_TASKS| ActivityManager.RECENT_IGNORE_UNAVAILABLE| ActivityManager.RECENT_INCLUDE_PROFILES;
  if (includeFrontMostExcludedTask) {
    flags|=ActivityManager.RECENT_WITH_EXCLUDED;
  }
  List<ActivityManager.RecentTaskInfo> tasks=mAm.getRecentTasksForUser(numTasksToQuery,flags,userId);
  if (tasks == null) {
    return new ArrayList<>();
  }
  boolean isFirstValidTask=true;
  Iterator<ActivityManager.RecentTaskInfo> iter=tasks.iterator();
  while (iter.hasNext()) {
    ActivityManager.RecentTaskInfo t=iter.next();
    if (sRecentsBlacklist.contains(t.realActivity.getClassName())) {
      iter.remove();
    }
    boolean isExcluded=(t.baseIntent.getFlags() & Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS) == Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS;
    isExcluded|=quietProfileIds.contains(t.userId);
    if (isExcluded && (!isFirstValidTask || !includeFrontMostExcludedTask)) {
      iter.remove();
    }
    isFirstValidTask=false;
  }
  return tasks.subList(0,Math.min(tasks.size(),numLatestTasks));
}