Examples of errors detected by the V3054 diagnostic

V3054. Potentially unsafe double-checked locking. Use volatile variable(s) or synchronization primitives to avoid this.

RunUO

V3054 Potentially unsafe double-checked locking. Use volatile variable(s) or synchronization primitives to avoid this. Item.cs 1624

private Packet m_RemovePacket;
....
private object _rpl = new object();
public Packet RemovePacket
{
  get
  {
    if (m_RemovePacket == null)
    {
      lock (_rpl)
      {
        if (m_RemovePacket == null)
        {
          m_RemovePacket = new RemoveItem(this);
          m_RemovePacket.SetStatic();
        }
      }
    }

    return m_RemovePacket;
  }
}

PowerShell

V3054 Potentially unsafe double-checked locking. Use volatile variable(s) or synchronization primitives to avoid this. Utils.cs 305

....
private static bool logInitialized = false;
....
if (!logInitialized)
{
  lock (logLock)
  {
    if (!logInitialized)
    {
      DebugHelper.GenerateLog = File.Exists(logFile);
      logInitialized = true;
    }
  }
}
....