! HTrace non mostra CallStack

Question

Quando utilizzo ! HTrace -Diff in Windbg to Debug AManiglia perdite, ottengo un sacco di maniglie (probabilmente quelle che stanno perdendo) che non mostrano un callstack:

Cosa potrebbe essere una ragione per questo e quali opzioni devo eseguire il debug in questo modo?

Handle = 0x000273e4 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273e0 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273dc - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273d8 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273d4 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273d0 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273cc - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273c8 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273c4 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273c0 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

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Handle = 0x000273bc - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273b8 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273b4 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273b0 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273ac - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273a8 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------
Handle = 0x000273a4 - OPEN
Thread ID = 0x00001190, Process ID = 0x0000114c

--------------------------------------

.

Aggiornamento : la perdita della maniglia sembra dipendere da driver grafici o schede grafiche.Inizia a perdere quando utilizzo qualsiasi forma di WPF perde solo su alcuni sistemi Windows XP con determinate schede grafiche / driver.

Answer 1

Calls are performed in kernel mode by ZwOpenProcess routine (http://msdn.microsoft.com/en-us/library/windows/hardware/ff567022(v=vs.85).aspx) and not followed by a ZwClose call. Then the handle leaks. You don't see the callstacks because they are only available when calls are performed from user mode (OpenProcess / CloseHandle).

On an XP SP3, it seems difficult to find the culprit. The solution would be to use the 'Object reference tracing' functionality built in the OS, but this path is paved with issues (see http://www.osronline.com/showthread.cfm?link=198302 for further references). Since you found out this issue arises only when a particular video card is present, you can try to contact the vendor or check for a newer version of the driver.