Endless recursion runs on Mac OS X (tested on 10.7) when setting QScrollArea::widgetResizable to true, adding widget and setting its minimum size hint greater than corresponding maximum size hint.

Code to reproduce:
QScrollArea* scrollArea = new QScrollArea();
scrollArea->setWidgetResizable (true); //true, not false;
QWidget* widget = new QWidget();
widget->setMinimumHeight(100);
widget->setMaximumHeight(120);
scrollArea->setWidget(widget);
someParentLayout->addWidget(scrollArea);
...
widget->setMinimumHeight(125); //BOOM

QScrollArea calls updateScrollBars, updateScrollBars tries to adjust widget's size, it causes repaint, repaint causes updateScrollBars call etc etc.

Here just a small part of call stack, bug is too easy to reproduce, so I believe dump is not needed:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 Test 0x00000001007f8d94 QStyleSheetStyle::renderRule(QWidget const*, QStyleOption const*, int) const + 92
1 Test 0x00000001007e1cac QStyleSheetStyle::pixelMetric(QStyle::PixelMetric, QStyleOption const*, QWidget const*) const + 260
2 Test 0x0000000100a37ca0 QScrollBar::sizeHint() const + 190
3 Test 0x0000000100a973b4 QAbstractScrollArea::maximumViewportSize() const + 76
4 Test 0x0000000100aa544d QScrollAreaPrivate::updateScrollBars() + 153
5 Test 0x0000000100aa5bbc QScrollArea::eventFilter(QObject*, QEvent*) + 124
6 Test 0x0000000100f10e4f QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) + 247
7 Test 0x0000000100108d81 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 397
8 Test 0x000000010010d308 QApplication::notify(QObject*, QEvent*) + 17702
9 Test 0x0000000100f149ac QCoreApplication::notifyInternal(QObject*, QEvent*) + 208
10 Test 0x0000000100f1e0f1 QCoreApplication::sendEvent(QObject*, QEvent*) + 81
11 Test 0x000000010004ce71 QWidgetPrivate::setGeometry_sys_helper(int, int, int, int, bool) + 2267
12 Test 0x0000000100052bba QWidgetPrivate::setGeometry_sys(int, int, int, int, bool) + 2704
13 Test 0x00000001001c8b65 QWidget::resize(QSize const&) + 239
14 Test 0x0000000100aa596b QScrollAreaPrivate::updateScrollBars() + 1463
15 Test 0x0000000100aa5bbc QScrollArea::eventFilter(QObject*, QEvent*) + 124
16 Test 0x0000000100f10e4f QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) + 247
17 Test 0x0000000100108d81 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 397
18 Test 0x000000010010d308 QApplication::notify(QObject*, QEvent*) + 17702
19 Test 0x0000000100f149ac QCoreApplication::notifyInternal(QObject*, QEvent*) + 208
20 Test 0x0000000100f1e0f1 QCoreApplication::sendEvent(QObject*, QEvent*) + 81
21 Test 0x000000010004ce71 QWidgetPrivate::setGeometry_sys_helper(int, int, int, int, bool) + 2267
22 Test 0x0000000100052bba QWidgetPrivate::setGeometry_sys(int, int, int, int, bool) + 2704
23 Test 0x00000001001c8b65 QWidget::resize(QSize const&) + 239
24 Test 0x0000000100aa596b QScrollAreaPrivate::updateScrollBars() + 1463
25 Test 0x0000000100aa5bbc QScrollArea::eventFilter(QObject*, QEvent*) + 124
26 Test 0x0000000100f10e4f QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) + 247
27 Test 0x0000000100108d81 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 397
28 Test 0x000000010010d308 QApplication::notify(QObject*, QEvent*) + 17702
29 Test 0x0000000100f149ac QCoreApplication::notifyInternal(QObject*, QEvent*) + 208
30 Test 0x0000000100f1e0f1 QCoreApplication::sendEvent(QObject*, QEvent*) + 81
31 Test 0x000000010004ce71 QWidgetPrivate::setGeometry_sys_helper(int, int, int, int, bool) + 2267
32 Test 0x0000000100052bba QWidgetPrivate::setGeometry_sys(int, int, int, int, bool) + 2704
33 Test 0x00000001001c8b65 QWidget::resize(QSize const&) + 239
34 Test 0x0000000100aa596b QScrollAreaPrivate::updateScrollBars() + 1463
...