Qt C++ code crash (ASSERT: *node == e)

[Vyuvaraj]

What is reason behind the below error message

ASSERT: "*node == e || (*node)->next" in file ....\include/QtCore/../../src/corelib/tools/qhash.h, line 918
11:43:02: The program has unexpectedly finished.
11:43:02: The process was ended forcefully.

I have tcp client socket which received 74 bytes of data from server @ 20mSec interval.
I'm collecting the data using queue and emitting @ every 50mSec interval to other C++ backend class which does processing of the data.
I'm doubtful if the processing on the backend class is causing the issue?
How to debug the crash and collect crash log?

[Christian Ehrlicher]

@Vyuvaraj said in Qt C++ code crash (ASSERT: *node == e):

How to debug the crash and collect crash log?

Use a debugger and take a look at the backtrace to see where it comes from. Are you using threads?

[fcarney]

Code Please

[Vyuvaraj]

@fcarney

bool m_quit = false;
bool m_InProcess = false;
QTcpSocket *m_sock = nullptr;

tpClient::tpClient(QObject *parent) : QThread(parent) {
   m_InProcess = false;
   m_sock = new QTcpSocket(this);
   connect(m_sock, SIGNAL(connected()), this, SLOT(connected()));
   connect(m_sock, SIGNAL(disconnected()), this, SLOT(disconnected()));
   connect(m_sock, SIGNAL(readyRead()), this, SLOT(readyRead()));
   m_sock->abort();
   m_sock->connectToHost("127.0.0.1",51001);
}

void tpClient::connected() { if(!isRunning()){start();} }

void tpClient::readyRead() { m_dataInQ.push(m_sock->readAll()); }

void tpClient::run(void) {
  qDebug() <<  "Thread is Running...";
  while(!m_quit){
    while(!m_dataInQ.empty() && !m_InProcess){
    /* This will allow the rendering engine to achieve a consistent 60 frames-per-second refresh rate.
        60 FPS means that there is approximately 16 milliseconds.
        Provide 2 times more for safety */
    msleep(32);

    if(m_mutex.tryLockForRead(1000)) {
      QByteArray data = m_dataInQ.front();
      m_dataInQ.pop();
      m_mutex.unlock();
      processInput(processRawInput(data));
    }   
  }

  msleep(10); 
  }
}

[Christian Ehrlicher]

Please read the QThread docs - you're doing it wrong, the examples and docs give you a good starting point...