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PODebug Assertion Failed … _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)
 

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  1. PODebug Assertion Failed … _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)
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    <p>I have got a really bad memory leak I am trying to fix, but somehow i am not able to delete Objects without triggering this assertation.</p> <p>I have searched for a solution via Google and have read the Questions on stackoverflow about this Error but I was still not able to find the answer!</p> <p>Possible reasons to get this Error according to my research:<br> 1. deleting objects more then one<br> 2. shadow copying<br> 3. creating and deleting Objects that are loaded from an external dll<br> 4. creating objects without storing the pointer</p> <p>BUT:<br> 1. I checked the code and was not able to find double deletion<br> 2. I use a copy constructor to copy Objects<br> 3. The Error relatet classes are build (with MS Visual Studio) to a seperate lib but not to a dll. AND all the classes that are related to this error are located in the same lib.<br> 4. I checked the code and it seems like that's not the problem</p> <p>It would be great if anybody is able to spot the mistake in the code below, and I appreciate every hint that points me to the solution of the problem.</p> <p>EDIT:<br> I forgot to mention the same deleting problem in sendThreadMain of MessageSystem (see code below). If i delete the Message there it causes unexpected errors somewhere else in the code. Might just be wrong data transmission... but i do not really know.<br> This code is run on Windows and Linux!</p> <p>Here are the error related parts of the code:</p> <p>Message</p> <pre><code>class Message { public: Message (char type, unsigned char id, unsigned short size) { mType = type; mId = id; mSize= size; } Message(const Message &amp;o) { mType = o.mType; mId = o.mId; mSize = o.mSize; } char getType() const {return mType;}; unsigned char getId() const {return mId;}; unsigned short getSize() const {return mSize;}; protected: char mType; unsigned char mId; unsigned short mSize; }; class JoinMessage : public Message { public: JoinMessage () : Message ('j', 0, sizeof (JoinMessage)) { team = TEAM_SPECTATOR; } JoinMessage (unsigned char id) : Message ('j', id, sizeof (JoinMessage)){} JoinMessage (const JoinMessage &amp;o) : Message (o) { team = o.team; setName(o.getName()); } void setName(std::string newName) { if (newName.length() &gt; MAX_PLAYER_NAME_LENGHT) newName = newName.substr(0, MAX_PLAYER_NAME_LENGHT); memset(name, 0, MAX_PLAYER_NAME_LENGHT); for(unsigned int i = 0; i &lt; newName.length(); i++) name[i] = newName[i]; } std::string getName() const { std::string stringToReturn; for(unsigned int i = 0; i &lt; MAX_PLAYER_NAME_LENGHT; i++) { if (name[i]) stringToReturn.push_back(name[i]); else break; } return stringToReturn; } TeamIdentifier team; private: unsigned char name[MAX_PLAYER_NAME_LENGHT]; }; // there are a lot other messages </code></pre> <p>MessageQueue</p> <pre><code>MessageQueue::~MessageQueue() { boost::mutex::scoped_lock lock (queueMutex); while(messageQueue.size() &gt; 0) { // the crash is non-reproducible // works 90% of the time delete messageQueue.front (); // &lt;- Debug Assertion Failed … _BLOCK_TYPE_IS_VALID messageQueue.pop_front(); } } void MessageQueue::enqueMessage (Message* message) { { boost::mutex::scoped_lock lock (queueMutex); messageQueue.push_back(message); } } Message* MessageQueue::dequeMessage () { boost::mutex::scoped_lock lock (queueMutex); if (messageQueue.size() == 0) return nullptr; Message* message = messageQueue.front (); messageQueue.pop_front(); return message; } </code></pre> <p>MessageSystem</p> <pre><code>template &lt;class MessageType&gt; void broadcast (MessageType &amp;message) { MessageType *internMessage = new MessageType(message); boost::mutex::scoped_lock lock (mRecipientMapMutex); std::map &lt;boost::asio::ip::udp::endpoint, MessageQueue *&gt;::iterator it; for (it = mRecipientMap.begin (); it != mRecipientMap.end (); it++) { it-&gt;second-&gt;enqueMessage(internMessage); } } template &lt;class MessageType&gt; void post (MessageType &amp;message, boost::asio::ip::udp::endpoint &amp;recipient) { MessageType *internMessage = new MessageType(message); std::map &lt;boost::asio::ip::udp::endpoint, MessageQueue* &gt;::iterator it; MessageQueue *messageQueue = NULL; { boost::mutex::scoped_lock lock (mRecipientMapMutex); it = mRecipientMap.find (recipient); if (it != mRecipientMap.end()) messageQueue = it-&gt;second; if(messageQueue) messageQueue-&gt;enqueMessage (internMessage); } } void MessageSystem::sendThreadMain () { // copy endpoints to vecotr so it can be // deleted from map while iterating std::vector&lt;udp::endpoint&gt; endpoints; { boost::mutex::scoped_lock lock (mRecipientMapMutex); std::map &lt;udp::endpoint, MessageQueue *&gt;::iterator mapIt = mRecipientMap.begin (); while (mapIt != mRecipientMap.end()) { endpoints.push_back(mapIt-&gt;first); mapIt++; } } std::vector&lt;udp::endpoint&gt;::iterator endpointIt = endpoints.begin(); while (endpointIt != endpoints.end()) { char sendBuffer[PACKET_SIZE]; int sendBufferPosition = 0; { boost::mutex::scoped_lock lock (mRecipientMapMutex); MessageQueue *messageQueue = mRecipientMap[*endpointIt]; if (messageQueue == nullptr) { mRecipientMap.erase(*endpointIt); endpointIt++; continue; } while (Message *message = messageQueue-&gt;dequeMessage ()) { if (sendBufferPosition + message-&gt;getSize() &gt; PACKET_SIZE) { // put message back and send it later messageQueue-&gt;enqueMessage (message); break; } // copy message into buffer std::memcpy ( &amp;sendBuffer [sendBufferPosition], message, message-&gt;getSize()); sendBufferPosition += message-&gt;getSize(); // deleting this message causes a crash if 2 or more // recipients are registered within MessageSystem //delete message; &lt;- RANDOM CRASH elsewhere in the program } } .... // more code down here that seems not related to the error </code></pre>
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    1. COYou do not add messages to the queue in any other place than the `broadcast` function?
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      1. USSome programmer dude
    2. COThere's good news and bad news. The good news is that this most definitely is not caused by a memory leak.
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    3. COI'm not sure if this is the problem but you should have a virtual destructor in the class Message.
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