Article ID: 979524 - View products that this article applies to.
The Distributed File System (DFS) Replication service crashes randomly on a computer that is running an x64-based version of Windows Server 2008 R2. Additionally, you may experience one or more of the following symptoms:
This issue occurs because the DFS Replication service performs asynchronous local I/O requests incorrectly when the service is under stress.
Hotfix informationA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
PrerequisitesTo apply this hotfix, you must be running a x64-based version of Windows Server 2008 R2. Additionally, the DFS Replication service under the File Server role must be installed.
Restart requirementYou must restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace a previously released hotfix.
File informationThe global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2008 R2 file information notes
For all supported x64-based versions of Windows Server 2008 R2
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
978538For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/978538/ )The DFS Replication service crashes randomly in Windows Server 2008
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Additional file information
Additional file information for Windows Server 2008 R2
Additional files for all supported x64-based versions of Windows Server 2008 R2
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Call stack informationThe following is a sample of the call stack that is generated when the issue occurs:
0:012> dps 0x00000000`0035b8e0 00000000`0035b8e0 00000000`00000000 00000000`0035b8e8 000e1780`00006803 00000000`0035b8f0 00000000`76d88f15 ntdll!RtlFreeHeap+0x1a2 00000000`0035b8f8 00000000`76c3c4ca kernel32!HeapFree+0xa 00000000`0035b900 000007fe`fd3f10c0 msvcrt!free+0x1c 00000000`0035b908 00000000`ff603493 dfsrs!AsyncBuffers::FreeAsyncBuffers+0x9f 00000000`0035b910 00000000`ff605d68 dfsrs!AsyncUnbufferedFileReader::Close+0x40 00000000`0035b918 00000000`ff605c20 dfsrs!AsyncUnbufferedFileReader::`scalar deleting destructor'+0x3c 00000000`0035b920 00000000`ff624aea dfsrs!MarshalContext::~MarshalContext+0xba 00000000`0035b928 00000000`ff62ccdb dfsrs!MarshalFileReader::`scalar deleting destructor'+0x47 00000000`0035b930 00000000`ff6dc6c1 dfsrs!OutConnection::OpenFile+0x222d 00000000`0035b938 00000000`ff7509d5 dfsrs!UpstreamTransport::OpenFile+0xd5 00000000`0035b940 00000000`ff735f9d dfsrs!InitializeFileTransferAsyncState::ProcessIoCompletion+0x909 00000000`0035b948 00000000`ff72ad1e dfsrs!IoPortManager::ThreadEntryProc+0x272 00000000`0035b950 00000000`76c2be3d kernel32!BaseThreadInitThunk+0xd
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