Program: 11377
Project: 11377
Buggy source:
@Override public void onConnectionStateChange(BluetoothDevice device,int status,int newState){
  super.onConnectionStateChange(device,status,newState);
switch (newState) {
case BluetoothProfile.STATE_CONNECTED:
    if (requireBonding && device.getBondState() == BluetoothDevice.BOND_NONE) {
      device.createBond();
      device.setPairingConfirmation(true);
      IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
      context.registerReceiver(new BroadcastReceiver(){
        @Override public void onReceive(        Context context,        Intent intent){
          final String action=intent.getAction();
          if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
            final int state=intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,BluetoothDevice.ERROR);
            if (state == BluetoothDevice.BOND_BONDED) {
              BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
              context.unregisterReceiver(this);
              connectMidiDevice(device);
            }
          }
        }
      }
,filter);
    }
 else {
      connectMidiDevice(device);
    }
  break;
case BluetoothProfile.STATE_DISCONNECTED:
String deviceAddress=device.getAddress();
synchronized (midiInputDevicesMap) {
MidiInputDevice midiInputDevice=midiInputDevicesMap.get(deviceAddress);
if (midiInputDevice != null) {
  midiInputDevicesMap.remove(deviceAddress);
  midiInputDevice.setOnMidiInputEventListener(null);
  if (midiDeviceDetachedListener != null) {
    midiDeviceDetachedListener.onMidiInputDeviceDetached(midiInputDevice);
  }
}
}
synchronized (midiOutputDevicesMap) {
MidiOutputDevice midiOutputDevice=midiOutputDevicesMap.get(deviceAddress);
if (midiOutputDevice != null) {
midiOutputDevicesMap.remove(deviceAddress);
if (midiDeviceDetachedListener != null) {
  midiDeviceDetachedListener.onMidiOutputDeviceDetached(midiOutputDevice);
}
}
}
synchronized (bluetoothDevicesMap) {
bluetoothDevicesMap.remove(deviceAddress);
}
break;
}
}

Fixed version (ground truth):
@Override public void onConnectionStateChange(BluetoothDevice device,int status,int newState){
  super.onConnectionStateChange(device,status,newState);
switch (newState) {
case BluetoothProfile.STATE_CONNECTED:
    if (requireBonding && device.getBondState() == BluetoothDevice.BOND_NONE) {
      device.createBond();
      device.setPairingConfirmation(true);
      IntentFilter filter=new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
      context.registerReceiver(new BroadcastReceiver(){
        @Override public void onReceive(        Context context,        Intent intent){
          final String action=intent.getAction();
          if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
            final int state=intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE,BluetoothDevice.ERROR);
            if (state == BluetoothDevice.BOND_BONDED) {
              BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
              context.unregisterReceiver(this);
              connectMidiDevice(device);
            }
          }
        }
      }
,filter);
    }
 else {
      connectMidiDevice(device);
    }
  break;
case BluetoothProfile.STATE_DISCONNECTED:
String deviceAddress=device.getAddress();
synchronized (midiInputDevicesMap) {
MidiInputDevice midiInputDevice=midiInputDevicesMap.get(deviceAddress);
if (midiInputDevice != null) {
  midiInputDevicesMap.remove(deviceAddress);
  ((InternalMidiInputDevice)midiInputDevice).stop();
  midiInputDevice.setOnMidiInputEventListener(null);
  if (midiDeviceDetachedListener != null) {
    midiDeviceDetachedListener.onMidiInputDeviceDetached(midiInputDevice);
  }
}
}
synchronized (midiOutputDevicesMap) {
MidiOutputDevice midiOutputDevice=midiOutputDevicesMap.get(deviceAddress);
if (midiOutputDevice != null) {
midiOutputDevicesMap.remove(deviceAddress);
if (midiDeviceDetachedListener != null) {
  midiDeviceDetachedListener.onMidiOutputDeviceDetached(midiOutputDevice);
}
}
}
synchronized (bluetoothDevicesMap) {
bluetoothDevicesMap.remove(deviceAddress);
}
break;
}
}