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  1. Qt
  2. QTBUG-82945

Reg->Qt 6/963c47aece12a0025707c76f6f8cb3de306752b8/MSVC2019/Windows: Crashes in property system

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Details

    • Bug
    • Resolution: Fixed
    • P1: Critical
    • None
    • 6.0.0
    • Core: Object Model
    • None
    • Windows

    Description

      On Windows, Qt Designer crashes in QMetaProperty::read() ( qtbug82945.zip
      , qtbug82945_stack.txt) and

      Linux is valgrind-clean; MinGW WIndows also is not affected.

         QPushButton w(qVersion());
   auto mo = w.metaObject();
   int idx = mo->indexOfProperty("shortcut"); // QKeySequence from QtGui (!)
   qDebug() << idx;
   qDebug() << mo->property(idx).read(&w);

      I heard rumours that there is some lazy metatype registration or similar; is there some code that is run at library load time, which may work differently on Windows?

      Note: It works for QSizePolicy though, that is maybe it is related to the QKeySequence meta type registration changes due to the QAction split?

      See comment of 8.4.2020, it looks like some compiler bug that for some reason only manifests within widgets. It disappeared at some time in MSVC 2019 16.6, but unfortunately re-appeared in 16.6.

      Attachments

        1. qtbug82945_diag.diff
          1 kB
        2. qtbug82945_stack.txt
          6 kB
        3. qtbug82945_tpl_diag.diff
          5 kB
        4. qtbug82945_tpl_test.zip
          2 kB
        5. qtbug82945.zip
          3 kB

        Issue Links

          relates to

          Technical task - A technical task. QTBUG-75670 moc: use new meta-type id system in meta-objects

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-82403 MSVC errors out on recent exported extern template QMetaTypeForType

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-83600 Invalid property assignment: "horizontalCenter" is a read-only property

          • P0: Blocker - MUST be fixed ASAP. This includes issues that prevent/block further Qt development; Legal issues & Serious data loss issues.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-84416 tst_qqmlproperty crash on msvc2019 developer build

          • 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
          For Gerrit Dashboard: QTBUG-82945
          # Subject Branch Project Status CR V
          296702,2 Use static function instead of lambda in an attempt to fix a MSVC compiler bug dev qt/qtbase Status: NEW -2 0
          295090,2 WIP: Remove QAxMetaObject 5.15 qt/qtactiveqt Status: ABANDONED -2 0
          295091,6 Port to QMetaObjectBuilder dev qt/qtactiveqt Status: MERGED +2 0
          295141,2 WIP: Port to MetaObjectBuilder 5.15 qt/qtactiveqt Status: ABANDONED -2 0
          295142,5 axviewer test: Add a metaobject dump 5.15 qt/qtactiveqt Status: MERGED +2 0
          295291,3 Port to QMetaObjectBuilder dev qt/qtactiveqt Status: ABANDONED +2 0
          295862,11 dumpcpp: Use moc to generate metaobject code dev qt/qtactiveqt Status: MERGED +2 0
          302378,4 Use static function instead of lambda to workaround a MSVC compiler bug dev qt/qtbase Status: MERGED +2 0

          Activity

            People

              fabiankosmale Fabian Kosmale
              kleint Friedemann Kleint
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              Dates

                Created:
                Updated:
                Resolved:

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