Nov 04, 2015 I'm currently seeing a large amount of memory consumed on a windows 2012 R2 box (that has 8GB of RAM), all of which is in the paged pool: - Processes running on the server are not showing anywhere near that amount of memory consumed. Running poolmon shows: - Approximately 5GB of memory of the paged pool is being taken up by the Toke tag. This article describes a memory leak issue that occurs in the svhdxflt.sys filter driver in Windows Server 2012 R2. The leak occurs against nonpaged pool with the svxp tag. You can fix this issue by using the update in this article.
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I have a Windows 2012 R2 std. Server with a memory leak. Something tells me that the leak started after we installed Symantic Endpoint protection 12.1.5 - but I am not sure. I tried to disable Symantic without any change to the memory leak. Using RamMap I can see that The Nonpaged Pool grows 1GB per day. Windows Server 2012 Memory Leak. Ask Question Asked 3 years, 7 months ago. Install the Windows WDK, run poolmon. Browse other questions tagged visual-studio-2013 memory-leaks server bamboo windows-server-2012-r2 or ask your own question. Is there a version of poolmon available for Windows Server 2008 64-bit? This KB article says it only applies to versions up to Server 2003. Is this tool (or something equivalent) available for Server. What is Event ID 2012 In Windows Server 2012 R2? We explain in detail and possible solutions to resolve and fix the problem in your environment.
PoolMon requires the following system configuration, permissions, and files.
System Requirements
The version of PoolMon included in the Windows Driver Kit (WDK) and described in this document runs only on Microsoft Windows XP and later versions of Windows.
Pool Tagging Requirement
Before running any version of PoolMon on Windows XP or earlier versions of Windows, you must enable pool tagging. Pool tagging is permanently enabled on Windows Server 2003 and later versions of Windows.
The pool tagging feature collects and calculates statistics about pool memory sorted by the tag value of the allocation.
To enable pool tagging, use GFlags, a tool included in Debugging Tools for Windows. Open the Global Flags dialog box, check the Enable Pool Tagging check box, and then restart the computer.
Requirements for Terminal Services Session Pool Monitoring
PoolMon displays allocations from the Terminal Services session pools only on Windows Server 2003 and later versions of Windows.
Windows allocates memory from Terminal Services session pools only when the computer is configured as a Terminal Server. On Terminal Servers, the kernel-mode portions of the Win32 subsystem allocate memory from the session pools. Otherwise, Windows allocates pool memory for Terminal Services from the system pool.
Requirements for Generating a Local Tag File
The /c parameter, which creates a localtag.txt file of pool tags used by drivers on the local machine, is supported only on 32-bit versions of Windows.
Display Requirements
To see the entire PoolMon display, the Command Prompt window size must be at least 80 characters wide (width=80) and at least 53 rows high (height=53), and the Command Prompt window buffer must be at least 500 characters wide (width=500) and at least 2000 rows high (height=2000). Otherwise, the display might be truncated.
Required Files
poolmon.exe
msdis130.dll
msvcp70.dll
msvcr70.dll
pooltag.txt
In our previous article we discussed how to identify a pool leak using perfmon. Although it may be interesting to know that you have a pool leak, most customers are interested in identifying the cause of the leak so that it can be corrected. In this article we will begin the process of identifying what kernel mode driver is leaking pool, and possibly identify why.
Often when we are collecting data for a poor performance scenario there are two pieces of data that we collect. Perfmon log data is one, as we discussed in our previous article. The other piece of data is poolmon logs. The memory manager tracks pool usage according to the tag associated with the pool allocations, using a technique called pool tagging. Poolmon gathers this data and displays it in an easy to use format. Apple logic pro free download. Poolmon can also be configured to dump data to a log, and in some scenarios it is beneficial to schedule poolmon to periodically collect such logs. There are several available techniques to schedule poolmon, however that is beyond the scope of this article.
Poolmon has shipped with many different packages over the years; it is currently available with the Windows Driver Kit. If you install the WDK to the default folder, poolmon will be in “C:Program Files (x86)Windows Kits8.0Toolsx64”. Poolmon does not have dependencies on other modules in this folder; you can copy it to your other computers when you need to investigate pool usage.
How does pool tagging work? When a driver allocates pool it calls the ExAllocatePoolWithTag API. This API accepts a tag - a four-letter string - that will be used to label the allocation. It is up to a driver developer to choose this tag. Ideally each developer will choose a tag that is unique to their driver and use a different tag for each code path which calls ExAllocatePoolWithTag. Because each tag should be unique to each driver, if we can identify the tag whose usage corresponds with the leak we can then begin to identify the driver which is leaking the memory. The tag may also give the driver developer clues as to why the memory is being leaked, if they use a unique tag for each code path.
To view the pool usage associated with each tag run “poolmon -b” from a command prompt. This will sort by the number of bytes associated with each tag. If you are tracking pool usage over a period of time, you can log the data to a file with “poolmon -b -n poolmonlog1.txt”, replacing 1 with increasing numbers to obtain a series of logs. Once you have a series of logs you may be able to view usage increasing for a specific tag, in a corresponding fashion to what you see in perfmon.
When analyzing poolmon the important data is at the top. Typically the tag with the largest usage in bytes is the cause of the leak.
In the above data we can see that the tag with the most pool usage is “Leak”. Now that we know what tag is leaking we need to identify what driver is using this tag. Techniques for associating a leak with a tag vary, but findstr is often effective. Most drivers are located in c:windowssystem32drivers, so that is a good starting point when looking for the driver. If you don’t find a result in that folder, go up a folder and try again, repeating until you get to the root of the drive.
C:>findstr /s Leak *.sys
UsersAdministratorDesktopmyfault.sys:
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Sega dreamcast games collection torrent. Although there is a professional version available for a fee, the free demo version has the ability to burn CDI images up to 700mb, which is usually more than enough for free Dreamcast games burned to discs.
└δ_Aï ╞♣@∟☺ë♣▓← Aï@♦ë♣¼←δCAâ∙♦u╓AïAìI♦A╕Leak;┴☼B┴3╔ï╨ §
In the above output we can see that “Leak” is used in myfault.sys. If we hadn’t forced this leak with notmyfault, the next step in troubleshooting would be an internet search for the tag and the driver. Often such a search will allow you to identify a specific fault within the driver and a solution.
Poolmon Windows Server 2012 R2
Don’t panic if findstr doesn’t find your tag, or if you find the tag but it is not unique to one driver. In future articles we will cover additional techniques for associating drivers with tags, and for associating allocations with specific code within a driver.