When you log on to a computer that is running Windows Server 2008 R2 or Windows 7, the logon process stops responding and a blue swirl is shown on the Welcome screen indefinitely. After some time, the computer stops responding to any network-related commands. You must forcibly restart the computer to recover from this issue.
OS Hotfix
- Windows 7
- Windows 7 Service Pack 1 (SP1)
- Windows Server 2008 R2
- Windows Server 2008 R2 Service Pack 1 (SP1)
This issue occurs because of a race condition between the Windows Event Log service and the Event Tracing for Windows (ETW) tracing functions. When the race condition occurs, it causes a deadlock situation. This deadlock situation then causes the Winlogon.exe process to become unresponsive.
