The device gets stuck when running "Surprise Removal" test with "Run Tests with I/O" option selected in a NDIS 6.2 WWAN driver for DTM.

·         When Run Tests with I/O option is disabled, the test passes. ·         This issue can be specific to a Win 7 NDIS 6.2 WWAN driver only. ·         Compiling the same driver as NDIS 6.0 or NDIS 5.1 does not reproduce the issue. ·         We may not see any pending IRPs or reference in the…

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Usage of NativeWindow.AssignHandle/ReleaseHandle when unmanaged code is involved.

If an application is Subclassing from managed and unmanaged code, it should not use the NativeWindow.AssignHandle/ReleaseHandle to subclass/unsubclass due to following reasons,   In a managed application, if we call NativeWindow.AssignHandle to subclass, while that Winproc is still in the subclass chain and some native component calls SetWindowLong or SetWindowSubclass, and then when we call…

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WPF based application experiences different memory leaks.

If you have a WPF based application which leaks memory with following symptoms, the fix is available now. This fix as on 31/ 3/ 2010 is the latest. This is fixing for about 5 different unrelated and extremely rare intermittent memory leaks in WPF. I will release the KB soon. I filled fix only for.net…

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Some Multi-threaded terminal server applications crashes in Win 2008 R2

In Win2008 R2 some Multi-threaded terminal server application may crashes with access violation in the test  eax, eax cpu instruction with following symptoms. This issue is very intermittent. 1.          2.       You may find following 2 threads, Executing a test instruction and causing AV. Trying to change the protection of exactly same code memory page…

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C# .net application doing serial communication bug-check Window 2003.

Ø  An application which is doing intensive serial communication may bug-check( blue Screen) a Windows 2003 Server even with latest update until this date 29 – March – 2010. Ø  This is potentially a issue in the speed.sys but yet have to confirm. Ø  As far as I know this issue is extremely rare only…

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Compile a Kernel mode driver in Visual Studio with full intellisense

To compile a Kernel mode driver in VS 2005 or similar Visual Studio versions with intellisense, following steps can be useful. I thought this is a ‘well known stuff’ but I was asked recently by some of my customers a couple of times, so thought of documenting the same although obviously not supported.   Nothing…

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