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  1. Qt
  2. QTBUG-45045

SIGFPE in QQuickMenu

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Details

    • Bug
    • Resolution: Duplicate
    • P2: Important
    • 6.2.5, 6.3.0 Beta3
    • 5.4.1
    • Quick: Controls 1
    • None
    • * Windows 7 x64
      * Qt 5.4.1
      * MinGW 4.9.1 32bits

    Description

      When calling Menu.popup() in QML, the process crash with SIGFPE.

      The issue comes from QtQuickMenu::popup() in qquickmenu.cpp:377 :

              if (mousePos.x() == int(qInf())) {

      The integer cast effectively emits the SIGFPE.

      This does not happens in standard cases. However, if for any reason the floating point unit control word has been changed previously the process may crash.

      I successfully prevented the crash by reseting the floating point control word to its original value just before calling Menu.popup(). Here is the function I used, if anyone want to test:

      void setFpu(unsigned short fpu)
{
	unsigned short var = fpu;
	asm("fldcw -2(%ebp)");
}

      A quick fix could be to replace the comparison by:

      mousePos.x() == std::numeric_limits<int>::min()

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-69167 Floating point exception in QPointF::toPoint() with qInf()s

          • 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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-52472 Undefined Behaviour in qsimpledrag.cpp line 207

          • 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-61783 SwipeDelegate left and right components not reacting on touchscreen press

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-45045
          # Subject Branch Project Status CR V
          393144,2 Stop using QGuiApplicationPrivate::lastCursorPosition.toPoint() dev qt/qtdeclarative Status: MERGED -1 0
          393209,9 Make QGuiApplicationPrivate::lastCursorPosition.toPoint() safe to use dev qt/qtbase Status: MERGED +2 0
          394092,2 Stop using QGuiApplicationPrivate::lastCursorPosition.toPoint() 6.3 qt/qtdeclarative Status: MERGED +2 0
          394093,2 Stop using QGuiApplicationPrivate::lastCursorPosition.toPoint() 6.2 qt/qtdeclarative Status: MERGED +2 0
          397257,2 Make QGuiApplicationPrivate::lastCursorPosition.toPoint() safe to use 6.2 qt/qtbase Status: MERGED +2 0
          397259,2 Make QGuiApplicationPrivate::lastCursorPosition.toPoint() safe to use 6.3 qt/qtbase Status: MERGED +2 0
          397260,2 Make QGuiApplicationPrivate::lastCursorPosition.toPoint() safe to use 6.2.4 qt/qtbase Status: MERGED +2 0

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              Unassigned Unassigned
              bterrier Benjamin Terrier
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              Dates

                Created:
                Updated:
                Resolved: