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Next, find the process ID of the 09basicmleakexe instance we just started and issue the following command:
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C:\LeakDiag\Logs>c:\LeakDiag\ldcmdexe /p 3028 /start /a 2 Sent Start Tracing command for pID 3832 Allocator 1: TRACING OFF Allocator 2: TRACING ON Allocator 3: TRACING OFF Allocator 4: TRACING OFF Allocator 5: TRACING OFF Allocator 6: TRACING OFF
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Remember to specify the process ID relative to your execution The /start command sends a signal to the process to start intercepting allocation calls, and the /a 2 tells it to intercept all allocations from the heap allocator The next step involves dumping all the allocation stack traces Before issuing a dump command with LeakDiag, you have to make sure that the symbol path is set correctly Unlike UMDH, LeakDiag does not honor the _NT_SYMBOL_PATH environment variable; rather, it relies on a registry value stored under the following key:
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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\LeakDiag
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The registry value is named SymPath and needs to be set to the directory containing the symbols After the symbol path has been set, continue the execution of 09basicmleakexe and, before exiting, type the following command:
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C:\LeakDiag\Logs>c:\LeakDiag\ldcmdexe /p 3028 /dump /a 2 Sent Dump Log command for pID 3832 Allocator 1: TRACING OFF Allocator 2: TRACING ON Allocator 3: TRACING OFF Allocator 4: TRACING OFF Allocator 5: TRACING OFF Allocator 6: TRACING OFF
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This time, we used the /dump switch to tell LeakDiag to produce a log file of all the allocations collected in the process The actual log filename is a conglomerate of various file attributes (such as filename, date of run, and so on) If you have a lot of log files in the directory, the best way to find the correct one is simply to look at the date and time of the file In this particular run, the filename corresponding to the run is
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05/31/2005 03:54 PM 155419_sess_01xml 12,631 09basicmleak_2296_WindowsHeapAllocator_050531-
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As you can tell by the xml extension, the log file is stored in XML format A good way to view an XML file is to load it in Internet Explorer You will also see that the log file comes with the associated schema and is quite large Rather than listing the entire log file here, we will simply focus on the most important parts, namely how the stack traces are represented If you want to see the entire log file, it can be found in the following location:
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C:\AWDBIN\WinXPx86chk\09basicmleak_2296_WindowsHeapAllocator_050531155419_sess_01xml
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The overall structure of the log file resembles the following:
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< xml version= 10 > <logdata> <xs:schema id= logdata xmlns:xs= http://wwww3org/2001/XMLSchema xmlns:msdata= urn:schemas-microsoft-com:xml-msdata > </xs:schema> <LEAKS ver= 131030915 > </LEAKS> <SUMMARY_INFO> </SUMMARY_INFO> </logdata>
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Whereas the schema section details the structure of the XML data, the LEAKS section details allocation history in the application run and finally a summary section that shows information such as LeakDiag settings, modules loaded, overall memory statistics, and so on The most interesting section is the LEAKS section Expanding the LEAKS section reveals a number of STACK sections each one detailing allocations made throughout the lifetime of the application Looking at the first stack trace yields
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<STACK numallocs= 0710 size= 028 totalsize= 019880 totalalloccount= 0710 totalallocsize= 019880 > <STACKSTATS> <SIZESTAT size= 028 numallocs= 0710 type= N/A /> <HEAPSTAT handle= 80000 numallocs= 0710 /> </STACKSTATS> <FRAME num= 0 dll= 09basicmleakexe function= CServer__GetSID offset= 0xC8 filename= c:\zone\pwd\cd\code\resleak\memleak\scenario1\server\srvcpp line= 42 addr= 0x1001C38 /> <FRAME num= 1 dll= 09basicmleakexe function= ThreadWorker offset= 0x6B filename= c:\zone\pwd\cd\code\resleak\memleak\scenario1\client\clientcpp line= 36 addr= 0x100142B /> <FRAME num= 2 dll= kernel32dll function= BaseThreadStart offset= 0x37 filename= line= addr= 0x7C80B50B /> <STACKID>008E5C88</STACKID> </STACK>
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Although the log file is represented in XML, it yields results very similar to the UMDH logs The STACK element attributes give information, such as number of
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