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  1. Qt
  2. QTBUG-96873

Calling QThread::start() and QThread::wait() repeatedly causes a crash

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Invalid
    • Affects Version/s: 6.2.0 RC2, 6.3
    • Fix Version/s: None
    • Component/s: Core: Threads
    • Labels:
      None
    • Platform/s:
      Linux/X11

      Description

      Running a program that creates a thread and then calls start() and wait() in a loop causes the following error on Linux:

      terminate called after throwing an instance of 'std::future_error'
        what():  std::future_error: No associated state
      

      Here is the program:

      #include <QCoreApplication>
      #include <QThread>
      #include <QTimer>
      
      static void startAndWaitForever()
      {
          QThread *thread = QThread::create([](){ });
      
          for (;;) {
              thread->start();
              Q_ASSERT(thread->wait());
          }
      };
      
      int main(int argc, char **argv) {
          QCoreApplication app(argc, argv);
      
          QTimer::singleShot(0, startAndWaitForever);
          return app.exec();
      }
      

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          Alan Fan
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            People

            Assignee:
            thiago Thiago Macieira
            Reporter:
            ievgenii.meshcheriakov Ievgenii Meshcheriakov
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              Dates

              Created:
              Updated:
              Resolved:

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