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!icpleak

The !icpleak extension examines all I/O completion objects in the system for the object with the largest number of queued entries.

!icpleak [HandleFlag]

Parameters

HandleFlag

If this flag is set, the display also includes all processes that have a handle to the object with the largest number of queued entries.

DLL

Windows 2000

Unavailable

Windows XP and later

Kdexts.dll

 

Additional Information

For information about I/O completion ports, see Microsoft Windows Internals by Mark Russinovich and David Solomon. (This book may not be available in some languages and countries.)

Remarks

This extension is useful when there is a leak in the I/O completion pool. I/O completion pool leaks can occur when a process is allocating I/O completion packets by calling PostQueuedCompletionStatus, but is not calling GetQueuedCompletionStatus to free them, or when a process is queuing completion entries to a port, but there is no thread retrieving the entries. To detect a leak run the !poolused extension and check the value of ICP pool tag. If pool use with the ICP tag is significant, a leak might have occurred.

This extension works only if the system maintains type lists. If the HandleFlag is set and the system has many processes, this extension will take a long time to run.

You can stop at any point by pressing CTRL+BREAK (in WinDbg) or CTRL+C (in KD).

 

 

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