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  1. Qt
  2. QTBUG-124496

QObject::timerEvent may be called before the timer elapsed

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Details

    • Windows
    • 66a76da0a (dev), 21e9875d6 (dev), 701263379 (6.8), 7e5f80ebb (tqtc/lts-6.5)
    • Foundation Sprint 116, Foundation Sprint 117

    Description

      QObject::timerEvent may be called before the timer elapsed because timer ids are aggressively reused by Qt's timers. This issue can happen if

      • A timer was recently stopped
      • There are remaining WM_TIMER events in the Windows event queue
      • QObject::startTimer is used to create a new timer

      Under these conditions, QObject::startTimer will likely reuse the timer id of the previously stopped timer. This causes premature execution of QObject::timerEvent when the lingering WM_TIMER is processed.

      This can for example cause premature false return from QSignalSpy even if no signals were received, which leads to flaky tests.

      See also

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        Issue Links

          is duplicated by

          Suggestion - Public suggestions QTBUG-132926 Guard WinTimerInfo::obj with a QPointer

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-124853 [REG: 6.5.3 - 6.7.0] QNetworkRequest is sometimes canceled if setTransferTimeout ist set

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-114152 QTimer: Make timers' timeouts ordered

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open
          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-124925 [REG 6.5.5 -> 6.5.6] Spectrum App Crashes after recording sound in "Record and Playback" Mode

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              manordheim Mårten Nordheim
              johanseg Jøger Hansegård
              Vladimir Minenko Vladimir Minenko
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              Dates

                Created:
                Updated:
                Resolved:

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