Qt 5.3.0: process crash complaining about free() in QQmlImageProviderBase when closing QQuickView



  • Hello, I am working on a project recently migrated to Qt 5.3.0 (previously it was running on Qt 5.2.1).

    My project is based on a QQuickView object being filled with some QML files, depending on some command I receive from a communication protocol...

    Since I was on Qt 5.2.1 the system worked fine and was rock solid: never a problem. Now with Qt 5.3.0 if I close the QQuickView window the process crashes with the following output:

    bq. * glibc detected * /home/morix/devel/aesys/VLED/build/bin/VLED: free(): invalid pointer: 0x091ec694 *
    ======= Backtrace: =========
    /lib/i386-linux-gnu/libc.so.6(+0x75ee2)[0xb5c1fee2]
    /usr/lib/i386-linux-gnu/libstdc++.so.6(_ZdlPv+0x1f)[0xb5e1b51f]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(_ZN21QQmlImageProviderBaseD0Ev+0x24)[0xb7136110]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(+0x211f59)[0xb713cf59]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(+0x2138b3)[0xb713e8b3]
    /opt/Qt/5.3/gcc/lib/libQt5Core.so.5(_ZN9QHashData11free_helperEPFvPNS_4NodeEE+0x4a)[0xb5f40e7a]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(_ZN17QQmlEnginePrivateD1Ev+0x8ab)[0xb71378c5]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(_ZN17QQmlEnginePrivateD0Ev+0x1c)[0xb7137a7c]
    /opt/Qt/5.3/gcc/lib/libQt5Core.so.5(_ZN7QObjectD1Ev+0x6a1)[0xb6173031]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(_ZN9QJSEngineD1Ev+0x36)[0xb70352b6]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(_ZN10QQmlEngineD1Ev+0xf0)[0xb71398fe]
    /opt/Qt/5.3/gcc/lib/libQt5Qml.so.5(_ZN10QQmlEngineD0Ev+0x1c)[0xb71399e2]
    /opt/Qt/5.3/gcc/lib/libQt5Core.so.5(_ZN14QObjectPrivate14deleteChildrenEv+0x6c)[0xb616e4ac]
    /opt/Qt/5.3/gcc/lib/libQt5Core.so.5(_ZN7QObjectD1Ev+0x661)[0xb6172ff1]
    /opt/Qt/5.3/gcc/lib/libQt5Gui.so.5(_ZN7QWindowD2Ev+0x6d)[0xb646a7bd]
    /opt/Qt/5.3/gcc/lib/libQt5Quick.so.5(_ZN12QQuickWindowD1Ev+0xd9)[0xb74878e9]
    /opt/Qt/5.3/gcc/lib/libQt5Quick.so.5(_ZN10QQuickViewD1Ev+0x9a)[0xb753925a]
    /home/morix/devel/aesys/VLED/build/bin/VLED[0x8059bbe]
    /home/morix/devel/aesys/VLED/build/bin/VLED[0x8059c8f]
    /home/morix/devel/aesys/VLED/build/bin/VLED[0x8051368]
    /home/morix/devel/aesys/VLED/build/bin/VLED[0x804d429]
    /lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0xb5bc34d3]
    /home/morix/devel/aesys/VLED/build/bin/VLED[0x804d2b1]

    (VLED is the name of my project in the output here above).

    It seems that some free() call in QQmlImageProviderBase is working on a unvalid pointer...

    Please consider that in my project I make use of a QQmlImageProviderBase-derived class to provide some "live" pixmaps to QML... but I don't think the problem is there: the code is very simple (simply returns some pixmaps previously inserted in a local collection) and furthermore with Qt 5.2.1 it works fine...

    I am working on Ubuntu Linux 12.04 LTS... but the problem is the same if I cross-compile the application for BeagleBone Black / TI AM335x... so it seems not to be an "environment-related" problem but rather a Qt problem...

    Does somebody else is experiencing such a problem with Qt 5.3.0? Any workaround?

    UPDATE
    I created a very simply project for reproducing the issue: it can be found "here":https://drive.google.com/file/d/0B6VBXyLO0UtUbE02eE5TWDBLLVU/edit?usp=sharing

    Please try it on your own and let me know if you have the same issue and if you find a valid workaround...


  • Lifetime Qt Champion

    Hi,

    Since you have a minimal project, you should take a look at the "bug report system":http://bugreports.qt-project.org to see if it's something known. If not please consider opening a new report providing your sample application.



  • Ok SGaist: I followed your suggestion: the issue has been filed to the bug report system as "QTBUG-39621":https://bugreports.qt-project.org/browse/QTBUG-39621

    I am going to update this discussion thread as soon as I have some news about it.


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