Program: 5913
Project: 5913
Buggy source:
@Override protected final void executeLoop(){
  long lastSyncWriteTimestamp=System.currentTimeMillis();
  long lastSyncReadTimestamp=lastSyncWriteTimestamp;
  while (true) {
    if (this.shouldStopHard())     break;
    if (this.shouldStopSoft()) {
      if (this.gracefull)       break;
 else       this.callbacks.handleLogEvent(Level.WARN,null,"String_Node_Str");
    }
synchronized (this.monitor) {
      final long currentTimestamp=System.currentTimeMillis();
      if (this.syncWriteDatastore != null) {
        if ((currentTimestamp - lastSyncWriteTimestamp) > this.syncWriteTimeout) {
          this.callbacks.handleLogEvent(Level.DEBUG,null,"String_Node_Str");
          try {
            if (!this.syncWriteDatastore.syncWrite())             this.callbacks.handleLogEvent(Level.ERROR,null,"String_Node_Str");
          }
 catch (          final Error exception) {
            this.callbacks.handleException(exception,"String_Node_Str");
          }
          lastSyncWriteTimestamp=currentTimestamp;
        }
      }
      if (this.syncReadDatastore != null) {
        if ((currentTimestamp - lastSyncReadTimestamp) > this.syncReadTimeout) {
          this.callbacks.handleLogEvent(Level.DEBUG,null,"String_Node_Str");
          try {
            if (!this.syncReadDatastore.syncRead())             this.callbacks.handleLogEvent(Level.ERROR,null,"String_Node_Str");
          }
 catch (          final Error exception) {
            this.callbacks.handleException(exception,"String_Node_Str");
          }
          lastSyncReadTimestamp=currentTimestamp;
        }
      }
    }
    try {
      Thread.sleep(this.waitTimeout);
    }
 catch (    final InterruptedException exception) {
    }
  }
}

Fixed version (ground truth):
@Override protected final void executeLoop(){
  long lastSyncWriteTimestamp=System.currentTimeMillis();
  long lastSyncReadTimestamp=lastSyncWriteTimestamp;
  while (true) {
    if (this.shouldStopHard())     break;
    if (this.shouldStopSoft()) {
      if (this.cancel)       break;
 else       this.callbacks.handleLogEvent(Level.WARN,null,"String_Node_Str");
    }
synchronized (this.monitor) {
      final long currentTimestamp=System.currentTimeMillis();
      if (this.syncWriteDatastore != null) {
        if ((currentTimestamp - lastSyncWriteTimestamp) > this.syncWriteTimeout) {
          this.callbacks.handleLogEvent(Level.DEBUG,null,"String_Node_Str");
          try {
            if (!this.syncWriteDatastore.syncWrite())             this.callbacks.handleLogEvent(Level.ERROR,null,"String_Node_Str");
          }
 catch (          final Error exception) {
            this.callbacks.handleException(exception,"String_Node_Str");
          }
          lastSyncWriteTimestamp=currentTimestamp;
        }
      }
      if (this.syncReadDatastore != null) {
        if ((currentTimestamp - lastSyncReadTimestamp) > this.syncReadTimeout) {
          this.callbacks.handleLogEvent(Level.DEBUG,null,"String_Node_Str");
          try {
            if (!this.syncReadDatastore.syncRead())             this.callbacks.handleLogEvent(Level.ERROR,null,"String_Node_Str");
          }
 catch (          final Error exception) {
            this.callbacks.handleException(exception,"String_Node_Str");
          }
          lastSyncReadTimestamp=currentTimestamp;
        }
      }
    }
    try {
      Thread.sleep(this.waitTimeout);
    }
 catch (    final InterruptedException exception) {
    }
  }
}