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  1. Qt
  2. QTBUG-61504

Possible QDnsLookup::lookup() memory leak

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P2: Important
    • Resolution: Invalid
    • Affects Version/s: 5.9.0
    • Fix Version/s: None
    • Component/s: Network: DNS
    • Labels:
      None
    • Environment:
      macOS 10.12.4

      Description

      Calling the lookup method on QDnsLookup class, produces a memory leak on macOS. It was inspected with Xcode Instruments Tool and Valgrind, both with similar results.

      This simple code can reproduce the problem easily.

      #include "dnsresolver.h"
      
      DnsResolver::DnsResolver(QObject *parent) : QObject(parent)
      {
          lookup = new QDnsLookup(QDnsLookup::A, "qt.io",QHostAddress("8.8.8.8"));
          connect(lookup, SIGNAL(finished()), this, SLOT(handleLookup()));
          lookup->lookup();
      }
      
      void DnsResolver::handleLookup()
      {
          // I use sleep for letting the profiler inspect the memory trace with enough time
          QThread::sleep(10);
      
          // I won't use lookup anymore
          delete lookup;
      
          // Let's close the app
          QCoreApplication::quit();
      }
      

       

      The output of Xcode mem leak result is attached.

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          Activity

            People

            Assignee:
            tpochep Timur Pocheptsov
            Reporter:
            comandillos Alejandro Antunez Reino
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              Dates

              Created:
              Updated:
              Resolved:

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