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  1. Qt
  2. QTBUG-73539

[Reg 5.12->5.13] Crash in qdrawhelper.cpp because of SSE-optimized code

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.12.2, 5.14.0 Alpha
    • 5.13
    • GUI: Painting
    • None
    • CPU: Haswell (Core i7-4700MQ)
      Compiler: Mingw64 7.3
    • Windows
    • 37352b23a90e9b4550b5a5cef175f2a77598faa0 (qt/qtbase/5.12)

    Description

      Starting any qwidget-based GUI application on 5.13 or dev branch causes the app to crash. The problem doesn't happen in 5.12.1 branch on the same device.

      It looks like the problem is raleted to SSE-optimized code in qdrawhelper.cpp, because commenting-out all the SSE switches in this file fixes the problem.

       

      Attachments

        1. backtrace.txt
          5 kB
          Dmitry Kazakov
        2. hacky_disable_sse_patch.diff
          13 kB
          Dmitry Kazakov
        3. qtbug73539_stack.txt
          94 kB
          Friedemann Kleint
        4. qtdiag.txt
          10 kB
          Dmitry Kazakov
        5. TestSimpleWidget.zip
          5 kB
          Dmitry Kazakov
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            allan.jensen Allan Sandfeld Jensen
            dkazakov Dmitry Kazakov
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            Dates

              Created:
              Updated:
              Resolved:

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