Select the product you need help with
XADM: Handles Leak During Online BackupArticle ID: 249148 - View products that this article applies to. This article was previously published under Q249148 SYMPTOMS
If you monitor the Exchange Server computer by using Performance Monitor, you find that many handles leaked after an online backup.
CAUSE
Several registry keys are opened during an online backup. Some of them come from the Mdbrest.dll file. After the query, the keys are not closed. They remain open for later use for performance reasons. But if the Mdbrest.dll has been relocated because of a memory address collision, those keys are not closed. They are reopened, and the previous handles leak when they are queried again.
RESOLUTIONTo resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the
Microsoft Knowledge Base:
191014 The following files are available for download from the Microsoft
Download Center:
(http://support.microsoft.com/kb/191014/EN-US/
)
XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack
x86:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
Collapse this image 
(http://www.microsoft.com/downloads/release.asp?ReleaseID=25443)
Alpha: Collapse this image
(http://www.microsoft.com/downloads/release.asp?ReleaseID=25444)
119591
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
(http://support.microsoft.com/kb/119591/EN-US/
)
How to Obtain Microsoft Support Files from Online Services
STATUSMicrosoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4. MORE INFORMATION
If you use CDB to attach to the Mad.exe file, the following information is displayed:
LDR: Automatic DLL relocation in Mad.exe
If you use the Oh.exe file to check the handles that are held by the Mad.exe file, you find that the leaked handles are from the following key:
LDR: Dll mdbrest.dll base 004b0000 relocated due to collision with Dynamically Allocated Memory CDB ModLoad: 0b950000 0b982000 Mdbrest.dll CDB ModLoad: 6fcc0000 6fcd4000 C:\Exchsrvr\Bin\Netif.dll CDB ModLoad: 6fcb0000 6fcb8000 C:\Exchsrvr\Bin\Isatq.dll HKEY_LOCAL_MACHINE\SYSTEM\CCS\Service\MSExchangeIS\ParametersPrivate
The fix closes all such keys when the .dll file is detached.
PropertiesArticle ID: 249148 - Last Review: October 26, 2006 - Revision: 4.1
|
Back to the top
