Glibc error (possible in qt text rendering ?)

[A Former User]

Hello,

I am facing this problem with my application. When I run the app, it gives me a glibc error. However, it DOES NOT always give this error. At certain occasions, it runs just fine. I am unable to debug it using QTCreator or check the memory profile using Valgrind.

For some reason, whenever I try to check it using valgrind, it doesn't throw the error. Can someone guide me as to how to narrow down on the problem ?

This is the error:
@*** glibc detected *** ./Jacobi: realloc(): invalid old size: 0x0000000000b37130 ***@

[A Former User]

And the stack trace is:
@
0 __lll_lock_wait_private /lib64/libc.so.6 0 0x7ffff55b473e
1 _L_lock_9946 /lib64/libc.so.6 0 0x7ffff5548d21
2 malloc /lib64/libc.so.6 0 0x7ffff5546d60
3 _dl_map_object_deps /lib64/ld-linux-x86-64.so.2 0 0x7ffff7de84a9
4 dl_open_worker /lib64/ld-linux-x86-64.so.2 0 0x7ffff7dedc88
5 _dl_catch_error /lib64/ld-linux-x86-64.so.2 0 0x7ffff7de9c36
6 _dl_open /lib64/ld-linux-x86-64.so.2 0 0x7ffff7ded7ca
7 do_dlopen /lib64/libc.so.6 0 0x7ffff55de840
8 _dl_catch_error /lib64/ld-linux-x86-64.so.2 0 0x7ffff7de9c36
9 dlerror_run /lib64/libc.so.6 0 0x7ffff55de8df
10 __libc_dlopen_mode /lib64/libc.so.6 0 0x7ffff55de947
11 init /lib64/libc.so.6 0 0x7ffff55b9d15
12 pthread_once /lib64/libpthread.so.0 0 0x7ffff65653d3
13 backtrace /lib64/libc.so.6 0 0x7ffff55b9e34
14 __libc_message /lib64/libc.so.6 0 0x7ffff553cedf
15 malloc_printerr /lib64/libc.so.6 0 0x7ffff5542c06
16 _int_realloc /lib64/libc.so.6 0 0x7ffff5545977
17 realloc /lib64/libc.so.6 0 0x7ffff55473be
18 ft_mem_qrealloc /usr/lib64/libfreetype.so.6 0 0x7ffff52568a2
19 ft_mem_realloc /usr/lib64/libfreetype.so.6 0 0x7ffff525695b
20 FT_GlyphLoader_CheckPoints /usr/lib64/libfreetype.so.6 0 0x7ffff5256b17
21 ?? /usr/lib64/libfreetype.so.6 0 0x7ffff5262daf
22 ?? /usr/lib64/libfreetype.so.6 0 0x7ffff5267329
23 ?? /usr/lib64/libfreetype.so.6 0 0x7ffff526c911
24 FT_Load_Glyph /usr/lib64/libfreetype.so.6 0 0x7ffff5259164
25 QFontEngineFT::loadGlyph(QFontEngineFT::QGlyphSet*, unsigned int, QFontEngineFT::GlyphFormat, bool) const /usr/lib64/libQtGui.so.4 0 0x7ffff70bb4c6
26 QFontEngineFT::recalcAdvances(QGlyphLayout*, QFlagsQTextEngine::ShaperFlag) const /usr/lib64/libQtGui.so.4 0 0x7ffff70bd038
27 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6ff0bf8
28 ?? /usr/lib64/libQtCore.so.4 0 0x7ffff6857163
29 ?? /usr/lib64/libQtCore.so.4 0 0x7ffff685b504
30 QTextEngine::shapeTextWithHarfbuzz(int) const /usr/lib64/libQtGui.so.4 0 0x7ffff7020d64
31 QTextEngine::shapeText(int) const /usr/lib64/libQtGui.so.4 0 0x7ffff70215cb
32 QTextEngine::shape(int) const /usr/lib64/libQtGui.so.4 0 0x7ffff70218e8
33 QTextLine::layout_helper(int) /usr/lib64/libQtGui.so.4 0 0x7ffff702b3a0
34 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6f2691c
35 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6f27221
36 QFontMetrics::boundingRect(QRect const&, int, QString const&, int, int*) const /usr/lib64/libQtGui.so.4 0 0x7ffff6ffe80f
37 QFontMetrics::size(int, QString const&, int, int*) const /usr/lib64/libQtGui.so.4 0 0x7ffff6ffe88f
38 ?? /usr/lib64/kde4/plugins/styles/oxygen.so 0 0x7fffeaddbd3e
39 ?? /usr/lib64/kde4/plugins/styles/oxygen.so 0 0x7fffeaddc11b
40 QCommonStyle::drawComplexControl(QStyle::ComplexControl, QStyleOptionComplex const*, QPainter*, QWidget const*) const /usr/lib64/libQtGui.so.4 0 0x7ffff70e5ffc
41 ?? /usr/lib64/kde4/plugins/styles/oxygen.so 0 0x7fffeadcb72b
42 QGroupBox::paintEvent(QPaintEvent*) /usr/lib64/libQtGui.so.4 0 0x7ffff71ce05b
43 QWidget::event(QEvent*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e292b8
44 QGroupBox::event(QEvent*) /usr/lib64/libQtGui.so.4 0 0x7ffff71cef17
45 QApplicationPrivate::notify_helper(QObject*, QEvent*) /usr/lib64/libQtGui.so.4 0 0x7ffff6dd8c34
46 QApplication::notify(QObject*, QEvent*) /usr/lib64/libQtGui.so.4 0 0x7ffff6dddac1
47 QCoreApplication::notifyInternal(QObject*, QEvent*) /usr/lib64/libQtCore.so.4 0 0x7ffff68d681c
48 QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e261c6
49 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e26da0
50 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e26c80
51 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e26c80
52 QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e25efc
@

[A Former User]

@53 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e26da0
54 QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e25efc
55 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e26da0
56 QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e26c80
57 QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e25efc
58 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6fe5278
59 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6fe5605
60 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6e53d6a
61 QApplication::x11ProcessEvent(_XEvent*) /usr/lib64/libQtGui.so.4 0 0x7ffff6e54dc9
62 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6e7c312
63 g_main_context_dispatch /usr/lib64/libglib-2.0.so.0 0 0x7ffff484158d
64 ?? /usr/lib64/libglib-2.0.so.0 0 0x7ffff4841d88
65 g_main_context_iteration /usr/lib64/libglib-2.0.so.0 0 0x7ffff4841f59
66 QEventDispatcherGlib::processEvents(QFlagsQEventLoop::ProcessEventsFlag) /usr/lib64/libQtCore.so.4 0 0x7ffff690150f
67 ?? /usr/lib64/libQtGui.so.4 0 0x7ffff6e7bf9e
68 QEventLoop::processEvents(QFlagsQEventLoop::ProcessEventsFlag) /usr/lib64/libQtCore.so.4 0 0x7ffff68d5a22
69 QEventLoop::exec(QFlagsQEventLoop::ProcessEventsFlag) /usr/lib64/libQtCore.so.4 0 0x7ffff68d5c1f
70 QCoreApplication::exec() /usr/lib64/libQtCore.so.4 0 0x7ffff68d9de7
71 main main.cc 17 0x446824 @