帮助调试此问题

时间：2009-11-16 03:25:45

标签： c++ debugging

我可能已经包含了超过我需要的内容，但话说回来，我可能完全错过了我需要添加的内容。无论如何，下面是堆栈跟踪，一些valgrind输出和一些相关代码。 valgrind输出可能解释最多。我认为堆栈跟踪价值不高;也许程序在它可能有用之前输出。

这是程序崩溃和堆栈跟踪的地方。

Transition: LROWS: 64, LCOLS: 256, n: 15360, row: 7, col: 174, calc1: 15534, calc2: 328
Transition: LROWS: 64, LCOLS: 256, n: 15616, row: 7, col: 174, calc1: 15790, calc2: 328
Transition: LROWS: 64, LCOLS: 256, n: 15872, row: 7, col: 174, calc1: 16046, calc2: 328
Transition: LROWS: 64, LCOLS: 256, n: 16128, row: 7, col: 174, calc1: 16302, calc2: 328

Program received signal SIGSEGV, Segmentation fault.
0x04b57fd3 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
Missing separate debuginfos, use: debuginfo-install ImageMagick-6.5.1.2-1.fc11.i586 ImageMagick-c++-6.5.1.2-1.fc11.i586 bzip2-libs-1.0.5-5.fc11.i586 expat-2.0.1-6.fc11.1.i586 glibc-2.10.1-5.i686 libXt-1.0.5-2.fc11.i586 libvorbis-1.2.0-9.fc11.i586 qt-4.5.3-9.fc11.i586 qt-x11-4.5.3-9.fc11.i586
(gdb) bt
#0  0x04b57fd3 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#1  0x04b58a22 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) ()
   from /usr/lib/libQtCore.so.4
#2  0x04b920a7 in QTimer::timeout() () from /usr/lib/libQtCore.so.4
#3  0x04b5d4fe in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQtCore.so.4
#4  0x04b51edf in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#5  0x04d5f8b4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#6  0x04d67029 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#7  0x04b420ab in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#8  0x04b6f29e in ?? () from /usr/lib/libQtCore.so.4
#9  0x04b6cc30 in ?? () from /usr/lib/libQtCore.so.4
#10 0x07db6308 in g_main_dispatch (context=<value optimized out>) at gmain.c:1824
#11 IA__g_main_context_dispatch (context=<value optimized out>) at gmain.c:2377
#12 0x07db99e0 in g_main_context_iterate (context=0x8148c90, block=<value optimized out>, dispatch=1, 
    self=0x81437d8) at gmain.c:2455
#13 0x07db9b13 in IA__g_main_context_iteration (context=0x8148c90, may_block=1) at gmain.c:2518
#14 0x04b6cb7c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQtCore.so.4
#15 0x04dfec45 in ?? () from /usr/lib/libQtGui.so.4
#16 0x04b40639 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQtCore.so.4
#17 0x04b40a8a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#18 0x04b42f0f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#19 0x04d5f737 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#20 0x08054b57 in LCD::LCDControl::Start (this=0x80f73d0, argc=1, argv=0xbffff404) at LCDControl.cpp:33
#21 0x0805d636 in main (argc=1, argv=0xbffff404) at Main.cpp:20
(gdb)

这是valgrind的一些输出。

Transition: LROWS: 64, LCOLS: 256, n: 15872, row: 7, col: 240, calc1: 16112, calc2: 64
Transition: LROWS: 64, LCOLS: 256, n: 16128, row: 7, col: 240, calc1: 16368, calc2: 64
Transition: LROWS: 64, LCOLS: 256, n: 0, row: 0, col: 9, calc1: 9, calc2: 988
==14585== 
==14585== Invalid read of size 1
==14585==    at 0x4007B88: memcpy (mc_replace_strmem.c:402)
==14585==    by 0x809509A: LCD::LCDGraphic::Transition() (LCDGraphic.cpp:490)
==14585==    by 0x8089D8C: LCD::Generic<LCD::LCDGraphic>::GraphicLayoutTransition() (Generic.h:512)
==14585==    by 0x80C2431: LCD::LCDWrapper::GraphicLayoutTransition() (LCDWrapper.h:61)
==14585==    by 0x80C20EC: LCD::LCDWrapper::qt_metacall(QMetaObject::Call, int, void**) (moc_LCDWrapper.cc:116)
==14585==    by 0x4B57DC2: QMetaObject::activate(QObject*, int, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B58A21: QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B920A6: QTimer::timeout() (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B5D4FD: QTimer::timerEvent(QTimerEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B51EDE: QObject::event(QEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4D5F8B3: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==    by 0x4D67028: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==  Address 0x61f38ef is 1 bytes before a block of size 65,536 alloc'd
==14585==    at 0x400612D: operator new[](unsigned int) (vg_replace_malloc.c:268)
==14585==    by 0x80938D7: LCD::LCDGraphic::GraphicInit(int, int, int, int, int) (LCDGraphic.cpp:84)
==14585==    by 0x8084AEE: LCD::DrvPicoGraphics::DrvPicoGraphics(std::string, LCD::LCDControl*, Json::Value*) (DrvPicoGraphics.cpp:52)
==14585==    by 0x8055562: LCD::LCDControl::ConfigSetup() (LCDControl.cpp:88)
==14585==    by 0x8054B51: LCD::LCDControl::Start(int, char**) (LCDControl.cpp:32)
==14585==    by 0x805D635: main (Main.cpp:20)
==14585== 
==14585== Invalid read of size 1
==14585==    at 0x4007B92: memcpy (mc_replace_strmem.c:402)
==14585==    by 0x809509A: LCD::LCDGraphic::Transition() (LCDGraphic.cpp:490)
==14585==    by 0x8089D8C: LCD::Generic<LCD::LCDGraphic>::GraphicLayoutTransition() (Generic.h:512)
==14585==    by 0x80C2431: LCD::LCDWrapper::GraphicLayoutTransition() (LCDWrapper.h:61)
==14585==    by 0x80C20EC: LCD::LCDWrapper::qt_metacall(QMetaObject::Call, int, void**) (moc_LCDWrapper.cc:116)
==14585==    by 0x4B57DC2: QMetaObject::activate(QObject*, int, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B58A21: QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B920A6: QTimer::timeout() (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B5D4FD: QTimer::timerEvent(QTimerEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B51EDE: QObject::event(QEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4D5F8B3: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==    by 0x4D67028: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==  Address 0x61f38ee is 2 bytes before a block of size 65,536 alloc'd
==14585==    at 0x400612D: operator new[](unsigned int) (vg_replace_malloc.c:268)
==14585==    by 0x80938D7: LCD::LCDGraphic::GraphicInit(int, int, int, int, int) (LCDGraphic.cpp:84)
==14585==    by 0x8084AEE: LCD::DrvPicoGraphics::DrvPicoGraphics(std::string, LCD::LCDControl*, Json::Value*) (DrvPicoGraphics.cpp:52)
==14585==    by 0x8055562: LCD::LCDControl::ConfigSetup() (LCDControl.cpp:88)
==14585==    by 0x8054B51: LCD::LCDControl::Start(int, char**) (LCDControl.cpp:32)
==14585==    by 0x805D635: main (Main.cpp:20)
==14585== 
==14585== Invalid read of size 1
==14585==    at 0x4007B9B: memcpy (mc_replace_strmem.c:402)
==14585==    by 0x809509A: LCD::LCDGraphic::Transition() (LCDGraphic.cpp:490)
==14585==    by 0x8089D8C: LCD::Generic<LCD::LCDGraphic>::GraphicLayoutTransition() (Generic.h:512)
==14585==    by 0x80C2431: LCD::LCDWrapper::GraphicLayoutTransition() (LCDWrapper.h:61)
==14585==    by 0x80C20EC: LCD::LCDWrapper::qt_metacall(QMetaObject::Call, int, void**) (moc_LCDWrapper.cc:116)
==14585==    by 0x4B57DC2: QMetaObject::activate(QObject*, int, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B58A21: QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B920A6: QTimer::timeout() (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B5D4FD: QTimer::timerEvent(QTimerEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B51EDE: QObject::event(QEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4D5F8B3: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==    by 0x4D67028: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==  Address 0x61f38ed is 3 bytes before a block of size 65,536 alloc'd
==14585==    at 0x400612D: operator new[](unsigned int) (vg_replace_malloc.c:268)
==14585==    by 0x80938D7: LCD::LCDGraphic::GraphicInit(int, int, int, int, int) (LCDGraphic.cpp:84)
==14585==    by 0x8084AEE: LCD::DrvPicoGraphics::DrvPicoGraphics(std::string, LCD::LCDControl*, Json::Value*) (DrvPicoGraphics.cpp:52)
==14585==    by 0x8055562: LCD::LCDControl::ConfigSetup() (LCDControl.cpp:88)
==14585==    by 0x8054B51: LCD::LCDControl::Start(int, char**) (LCDControl.cpp:32)
==14585==    by 0x805D635: main (Main.cpp:20)
==14585== 
==14585== Invalid read of size 1
==14585==    at 0x4007BA4: memcpy (mc_replace_strmem.c:402)
==14585==    by 0x809509A: LCD::LCDGraphic::Transition() (LCDGraphic.cpp:490)
==14585==    by 0x8089D8C: LCD::Generic<LCD::LCDGraphic>::GraphicLayoutTransition() (Generic.h:512)
==14585==    by 0x80C2431: LCD::LCDWrapper::GraphicLayoutTransition() (LCDWrapper.h:61)
==14585==    by 0x80C20EC: LCD::LCDWrapper::qt_metacall(QMetaObject::Call, int, void**) (moc_LCDWrapper.cc:116)
==14585==    by 0x4B57DC2: QMetaObject::activate(QObject*, int, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B58A21: QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B920A6: QTimer::timeout() (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B5D4FD: QTimer::timerEvent(QTimerEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4B51EDE: QObject::event(QEvent*) (in /usr/lib/libQtCore.so.4.5.3)
==14585==    by 0x4D5F8B3: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==    by 0x4D67028: QApplication::notify(QObject*, QEvent*) (in /usr/lib/libQtGui.so.4.5.3)
==14585==  Address 0x61f38ec is 4 bytes before a block of size 65,536 alloc'd
==14585==    at 0x400612D: operator new[](unsigned int) (vg_replace_malloc.c:268)
==14585==    by 0x80938D7: LCD::LCDGraphic::GraphicInit(int, int, int, int, int) (LCDGraphic.cpp:84)
==14585==    by 0x8084AEE: LCD::DrvPicoGraphics::DrvPicoGraphics(std::string, LCD::LCDControl*, Json::Value*) (DrvPicoGraphics.cpp:52)
==14585==    by 0x8055562: LCD::LCDControl::ConfigSetup() (LCDControl.cpp:88)
==14585==    by 0x8054B51: LCD::LCDControl::Start(int, char**) (LCDControl.cpp:32)
==14585==    by 0x805D635: main (Main.cpp:20)
Transition: LROWS: 64, LCOLS: 256, n: 256, row: 0, col: 9, calc1: 265, calc2: 988
Transition: LROWS: 64, LCOLS: 256, n: 512, row: 0, col: 9, calc1: 521, calc2: 988

这是LCDGraphic :: Transition（）：

void LCDGraphic::Transition() {
    int direction = visitor_->GetDirection();
    int col;
    transitioning_ = true;
    for(unsigned int row = 0; row < LROWS / YRES; row++) {
        if( direction == TRANSITION_LEFT ||
            (direction == TRANSITION_BOTH && row % 2 == 0))
            col = LCOLS - transition_tick_ - 1;
        else if( direction == TRANSITION_RIGHT || direction == TRANSITION_BOTH)
            col = transition_tick_;
        else
            col = 0;
        if(col < 0)
            col = 0;

        for(unsigned int i = 0; i < YRES; i++) {
            int n = row * YRES * LCOLS + i * LCOLS;
            RGBA tmp[LCOLS];
            LCDError("Transition: LROWS: %u, LCOLS: %u, n: %d, row: %d, col: %d, calc1: %d, calc2: %d", 
            LROWS, LCOLS, n, row, col, n + col, (LCOLS - col) * sizeof(RGBA));
            memcpy(tmp + XRES, GraphicFB + n + col + XRES, (LCOLS - col) * sizeof(RGBA));
            for(unsigned j = 0; j < XRES; j++)
                tmp[j] = NO_COL;
            memcpy(GraphicFB + n + col, tmp, sizeof(RGBA) * (LCOLS - col));

        }

    }

    transition_tick_+=XRES;
    if( transition_tick_ >= (int)LCOLS ) {
        transitioning_ = false;
        transition_tick_ = 0;
        emit static_cast<LCDEvents *>(
            visitor_->GetWrapper())->_TransitionFinished();
    }

    GraphicBlit(0, 0, LROWS, LCOLS);
}

这是LCDGraphic :: GraphicInit：

void LCDGraphic::GraphicInit(const int rows, const int cols,
    const int yres, const int xres, const int layers) {
    LROWS = rows;
    LCOLS = cols;
    YRES = yres;
    XRES = xres;
    LAYERS = layers;

    GraphicFB = (RGBA **)malloc(sizeof(RGBA **) * layers);

    for(int l = 0; l < layers; l++) {
        GraphicFB[l] = new RGBA[rows * cols];
    }

    for(int l = 0; l < layers; l++)
        for(int i = 0; i < cols * rows; i++)
            GraphicFB[l][i] = NO_COL;

}

1 个答案:

答案 0 :(得分：3)

问题在于你的两个memcpys之一：

memcpy(tmp + XRES, GraphicFB + n + col + XRES, (LCOLS - col) * sizeof(RGBA));

或者：

memcpy(GraphicFB + n + col, tmp, sizeof(RGBA) * (LCOLS - col));

如果没有行号，不能分辨出来，但由于它是无效的读取而不是无效的写入，因此可以假设您的第二个或第三个参数无效。

尝试添加一个print语句，打印出源地址的地址，看看你是否超出缓冲区;我希望你是。

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