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POC++ corruption of the heap
 

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  1. POC++ corruption of the heap
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    <p>I have a simple synchronisedQueue</p> <pre><code> template &lt;typename T&gt; class SynchronisedQueue { public: void Enqueue(const T&amp; data) { boost::unique_lock&lt;boost::mutex&gt; lock(queueMutex); dataQueue.push(data); conditionVariable.notify_one(); } T Dequeue() { boost::unique_lock&lt;boost::mutex&gt; lock(queueMutex); while (dataQueue.size()==0) { conditionVariable.wait(lock); } T result=dataQueue.front(); dataQueue.pop(); return result; } private: std::queue&lt;T&gt; dataQueue; // Use STL queue to store data boost::mutex queueMutex; // The mutex to synchronise on boost::condition_variable conditionVariable; // The condition to wait for }; </code></pre> <p>When I Dequeue from queue, I sometimes get corruption of the heap....</p> <blockquote> <p>HEAP: Free Heap block ccb1080 modified at ccb13c0 after it was freed</p> </blockquote> <p>call stack is :</p> <pre><code>ntdll.dll!76fa5654() [Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll] ntdll.dll!76f6a554() ntdll.dll!76f35a70() ntdll.dll!76fa5eff() ntdll.dll!76f6a3ba() ntdll.dll!76f35a70() msvcr90d.dll!_heap_alloc_base(unsigned int size=1222) Line 105 + 0x28 bytes C msvcr90d.dll!_heap_alloc_dbg_impl(unsigned int nSize=1186, int nBlockUse=1, const char * szFileName=0x00000000, int nLine=0, int * errno_tmp=0x1310ee18) Line 427 + 0x9 bytes C++ msvcr90d.dll!_nh_malloc_dbg_impl(unsigned int nSize=1186, int nhFlag=0, int nBlockUse=1, const char * szFileName=0x00000000, int nLine=0, int * errno_tmp=0x1310ee18) Line 239 + 0x19 bytes C++ msvcr90d.dll!_nh_malloc_dbg(unsigned int nSize=1186, int nhFlag=0, int nBlockUse=1, const char * szFileName=0x00000000, int nLine=0) Line 296 + 0x1d bytes C++ msvcr90d.dll!malloc(unsigned int nSize=1186) Line 56 + 0x15 bytes C++ msvcr90d.dll!operator new(unsigned int size=1186) Line 59 + 0x9 bytes C++ x.ax!std::_Allocate&lt;unsigned char&gt;(unsigned int _Count=1186, unsigned char * __formal=0x00000000) Line 43 + 0x9 bytes C++ ax.ax!std::allocator&lt;unsigned char&gt;::allocate(unsigned int _Count=1186) Line 145 + 0xb bytes C++ ax.ax!std::vector&lt;unsigned char,std::allocator&lt;unsigned char&gt; &gt;::_Buy(unsigned int _Capacity=1186) Line 1110 + 0xf bytes C++ ax.ax!std::vector&lt;unsigned char,std::allocator&lt;unsigned char&gt; &gt;::vector&lt;unsigned char,std::allocator&lt;unsigned char&gt; &gt;(const std::vector&lt;unsigned char,std::allocator&lt;unsigned char&gt; &gt; &amp; _Right=[1186](83 'S',50 '2',54 '6',67 'C',162 '¢',4 '',0,0,108 'l',0,0,0,2 '',64 '@',0,0,6 '',14 '',64 '@',0,35 '#',2 '',147 '“',76 'L',114 'r',53 '5',0,0,54 '6',79 'O',78 'N',4 '',0,0,0,0,54 '6',79 'O',78 'N',4 '',0,0,0,0,255 'ÿ',255 'ÿ',255 'ÿ',255 'ÿ',255 'ÿ',255 'ÿ',255 'ÿ',255 'ÿ',106 'j',4 '',0,0,0,0,0,1 '',65 'A',154 'š',3 '',1 '',176 '°',159 'Ÿ',255 'ÿ',240 'ğ',199 'Ç',...)) Line 501 + 0x11 bytes C++ ax.ax!SynchronisedQueue&lt;std::vector&lt;unsigned char,std::allocator&lt;unsigned char&gt; &gt; &gt;::Dequeue() Line 32 + 0xc bytes C++ ax.ax!PPin::FillBuffer(IMediaSample * pSample=0x0cadbea8) Line 225 + 0x12 bytes C++ ax.ax!PPin::DoBufferProcessingLoop() Line 300 + 0x13 bytes C++ ax.ax!CSourceStream::ThreadProc() + 0x13e bytes ax.ax!CAMThread::InitialThreadProc() + 0x51 bytes kernel32.dll!753bed6c() ntdll.dll!76f4377b() ntdll.dll!76f4374e() </code></pre> <blockquote> <p>What may cause this heap corruption? How to debug heap corruption errors? Any ideas...</p> </blockquote> <p><strong>UPDATE:</strong> Usage sample</p> <pre><code>// Enqueue void GetVideoStreams( BYTE *pData) { std::vector&lt;BYTE&gt; vecFrame(pData, pData + nLen/sizeof(pData[0])); IncomingFramesQueue.Enqueue(vecFrame); } //Dequeue void ConsumeVideoStreams() { vector&lt;BYTE&gt; data = IncomingFramesQueue.Dequeue(); } </code></pre>
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    1. COThe debug heap is really good at being slow and thus at disguising thread race errors. I suggest you move to the Release mode and just sweep through the program in div-2 manner using HeapValidate(GetProcessHeap(),0,0) to localize the timing issue. I mean validating the heap just before and just after the lines or calls where the errors occur and moving it until it is clear when a heap corruption occurs. Don't forget to use /MD when compiling, though.
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    2. COwhat is the type of dataQueue?
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    3. COYou are built in debug mode aren't you? Storage layout of STL varies between the two, so linking non-debug mode against debug mode libraries will go bang!
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