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  1. Qt
  2. QTBUG-54822

QML/V4 broken on AArch64 with non-39 bit VA space

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.6.3
    • 5.6.1, 5.7.0
    • QML: Declarative and Javascript Engine
    • None
    • openSUSE Leap 42.2 Alpha (Port for AArch64) with Linux 4.4.15
    • 2afb54fb51091765f79548b0b057795bc3c6eb38

    Description

      On linux for aarch64 with CONFIG_ARM64_VA_BITS=48, use of the QML JS engine results reliably in a nullptr dereference with following backtrace:

      #0  0x0000ffffb54f20b0 in QV4::Object::defineReadonlyProperty(QV4::String*, QV4::Value const&) () from /usr/lib64/libQt5Qml.so.5                                                                        
#1  0x0000ffffb554365c in ?? () from /usr/lib64/libQt5Qml.so.5                                                                                                                                          
#2  0x0000ffffb54b9ad4 in QV4::ExecutionEngine::ExecutionEngine(QV4::EvalISelFactory*) () from /usr/lib64/libQt5Qml.so.5                                                                                
#3  0x0000ffffb55ef5b0 in QV8Engine::QV8Engine(QJSEngine*) () from /usr/lib64/libQt5Qml.so.5                                                                                                            
#4  0x0000ffffb544b600 in QJSEngine::QJSEngine(QJSEnginePrivate&, QObject*) () from /usr/lib64/libQt5Qml.so.5                                                                                           
#5  0x0000ffffb555ac44 in QQmlEngine::QQmlEngine(QObject*) () from /usr/lib64/libQt5Qml.so.5

      I assume that V4 does not like it if bits 39-47 in pointers are used.

      Attachments

        For Gerrit Dashboard: QTBUG-54822
        # Subject Branch Project Status CR V
        169892,13 V4: Free up 2 address bits in 64bit mode 5.6 qt/qtdeclarative Status: MERGED -2 0

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            erikv Erik Verbruggen
            vogtinator Fabian Vogt
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            Dates

              Created:
              Updated:
              Resolved:

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