259333 2010-12-09 15:54:29 +0000 KExtendableItemDelegate crashes in extendRect() on initial paint 2014-07-06 15:19:38 +0000 1 1 10 Unmaintained kdelibs kdeui unspecified Ubuntu Linux RESOLVED FIXED NOR crash --- 1 echidnaman ahartmetz ahartmetz fd.svensson mirza.dervisevic rdesfo stavros.tsigas vladimir.tuboltsev yuberion 0 oldest_to_newest 1055870 0 echidnaman 2010-12-09 15:54:29 +0000 Version: unspecified (using KDE 4.5.85) OS: Linux I'm using the KExtendableItemDelegate in the Muon Software Center. I have a reproducible crash that after my list view is completely deleted and a new one is created, I get a crash the first time I try to extend an extender. I've checked using kDebug() and have confirmed that the extender pointer is valid. (I even used a function with the pointer right before extending to check if the pointer was dangling or not) For some reason it seems to crash even though the extender is valid. Here is a "bt full" backtrace from gdb, going back to the first paintSiblingsRecursive() call. #0 0xb7dcd383 in KExtendableItemDelegate::extenderRect (this=0x8811588, extender=0x890acc8, option=..., index=...) at ../../kdeui/itemviews/kextendableitemdelegate.cpp:313 indentation = <value optimized out> rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66} #1 0xb7dce642 in KExtendableItemDelegate::paint (this=0x8811588, painter=0xbfffc3bc, option=..., index=...) at ../../kdeui/itemviews/kextendableitemdelegate.cpp:277 extOption = {<QStyleOptionViewItemV3> = {<QStyleOptionViewItemV2> = {<QStyleOptionViewItem> = {<QStyleOption> = {version = 4, type = 12, state = {i = 106753}, direction = Qt::LeftToRight, rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66}, fontMetrics = {d = {d = 0x8150c80}}, palette = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x811d598, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 129}, decorationAlignment = {i = 132}, textElideMode = Qt::ElideRight, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 16, ht = 16}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = {d = 0x8150c80}, resolve_mask = 0}, showDecorationSelected = true}, features = {i = 0}}, locale = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb6b1c2c0 "QLocale", data = 0xb6b1d460, extradata = 0x0}}, { v = 0x10144, p = {index = 324, numberOptions = 1}}}, widget = 0x89017b0}, index = {r = 0, c = 0, p = 0x87cf970, m = 0x899a738}, checkState = Qt::Unchecked, icon = {d = 0x0}, text = {static null = {<No data fields>}, static shared_null = { ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x809304a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 52}, alloc = 0, size = 0, data = 0xb6b884b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x8093038, static codecForCStrings = 0x0}, viewItemPosition = QStyleOptionViewItemV4::OnlyOne, backgroundBrush = {d = { d = 0x80f9dc0}}} indicatorX = 0 indicatorOption = {<QStyleOptionViewItemV3> = {<QStyleOptionViewItemV2> = {<QStyleOptionViewItem> = {<QStyleOption> = {version = 4, type = 12, state = {i = 106753}, direction = Qt::LeftToRight, rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66}, fontMetrics = {d = {d = 0x8150c80}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x811d598, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 129}, decorationAlignment = {i = 132}, textElideMode = Qt::ElideRight, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 16, ht = 16}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = {d = 0x8150c80}, resolve_mask = 0}, showDecorationSelected = true}, features = {i = 0}}, locale = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb6b1c2c0 "QLocale", data = 0xb6b1d460, extradata = 0x0}}, { v = 0x10144, p = {index = 324, numberOptions = 1}}}, widget = 0x89017b0}, index = {r = 0, c = 0, p = 0x87cf970, m = 0x899a738}, checkState = Qt::Unchecked, icon = {d = 0x0}, text = {static null = {<No data fields>}, static shared_null = { ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x809304a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 52}, alloc = 0, size = 0, data = 0xb6b884b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x8093038, static codecForCStrings = 0x0}, viewItemPosition = QStyleOptionViewItemV4::Beginning, backgroundBrush = {d = { d = 0x80f9dc0}}} itemOption = {<QStyleOptionViewItemV3> = {<QStyleOptionViewItemV2> = {<QStyleOptionViewItem> = {<QStyleOption> = {version = 4, type = 12, state = {i = 106753}, direction = Qt::LeftToRight, rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66}, fontMetrics = {d = {d = 0x8150c80}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x811d598, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 129}, decorationAlignment = {i = 132}, textElideMode = Qt::ElideRight, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 16, ht = 16}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = {d = 0x8150c80}, resolve_mask = 0}, showDecorationSelected = true}, features = {i = 0}}, locale = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb6b1c2c0 "QLocale", data = 0xb6b1d460, extradata = 0x0}}, { v = 0x10144, p = {index = 324, numberOptions = 1}}}, widget = 0x89017b0}, index = {r = 0, c = 0, p = 0x87cf970, m = 0x899a738}, checkState = Qt::Unchecked, icon = {d = 0x0}, text = {static null = {<No data fields>}, static shared_null = { ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x809304a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 52}, alloc = 0, size = 0, data = 0xb6b884b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x8093038, static codecForCStrings = 0x0}, viewItemPosition = QStyleOptionViewItemV4::Beginning, backgroundBrush = {d = { d = 0x80f9dc0}}} extenderHeight = 33 indicatorY = 0 showExtensionIndicator = false cachedRow = 0 parentIndex = {r = -1, c = -1, p = 0x0, m = 0x0} cachedStateTick = 2 cachedParentIndex = {r = -1, c = -1, p = 0x0, m = 0x0} extender = 0x890acc8 row = 0 #2 0x08069ed1 in ApplicationDelegate::paint (this=0x8811588, painter=0xbfffc3bc, option=..., index=...) at /home/jonathan/src/muon/installer/ApplicationModel/ApplicationDelegate.cpp:90 rect = {x1 = 16, y1 = 135597184, x2 = 0, y2 = -1224209664} p = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f1a0 "QPainter", data = 0xb767f240, extradata = 0x0}}, d_ptr = {d = 0x0}} opa = <value optimized out> style = 0x812d490 local_option_title = {<QStyleOption> = {version = 20, type = 146267888, state = { i = 19}, direction = 3075647488, rect = {x1 = -1, y1 = 143768120, x2 = 0, y2 = 0}, fontMetrics = {d = {d = 0x8db70c0}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0xffffffff, current_group = 0, resolve_mask = 0}}, displayAlignment = { i = 2}, decorationAlignment = {i = 12}, textElideMode = 65537, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 0, ht = 0}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = { d = 0xffffffff}, resolve_mask = 4294967295}, showDecorationSelected = 128} overlays = {<QList<QString>> = {{p = {static shared_null = {ref = {_q_value = 1}, alloc = 0, begin = 0, end = 0, sharable = 1, array = {0x0}}, d = 0xffffffff}, d = 0xffffffff}}, <No data fields>} leftCount = <value optimized out> top = 144287544 width = <value optimized out> foregroundColor = {cspec = 132, ct = {argb = {alpha = 1, red = 0, green = 0, blue = 0, pad = 16}, ahsv = {alpha = 1, hue = 0, saturation = 0, value = 0, pad = 16}, acmyk = {alpha = 1, cyan = 0, magenta = 0, yellow = 0, black = 16}, ahsl = {alpha = 1, hue = 0, saturation = 0, lightness = 0, pad = 16}, array = {1, 0, 0, 0, 16}}} iconSize = <value optimized out> textWidth = <value optimized out> itemHeight = <value optimized out> topTextHeight = <value optimized out> leftToRight = true local_option_normal = {<QStyleOption> = {version = 143767552, type = 171390010, state = {i = 1031}, direction = Qt::LeftToRight, rect = {x1 = 148598976, y1 = 135110800, x2 = 0, y2 = 0}, fontMetrics = {d = {d = 0x0}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x0, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 0}, decorationAlignment = {i = 143768120}, textElideMode = 144911456, decorationPosition = 66, decorationSize = {wd = 0, ht = 602240}, font = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = { d = 0x8696400}, resolve_mask = 1}, showDecorationSelected = false} pixmap = {<QPaintDevice> = {_vptr.QPaintDevice = 0xbfffbf20, painters = 43848}, data = {d = 0x8c4acf0}} opt = {<QStyleOptionViewItemV3> = {<QStyleOptionViewItemV2> = {<QStyleOptionViewItem> = {<QStyleOption> = {version = 4, type = 12, state = {i = 106753}, direction = Qt::LeftToRight, rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66}, fontMetrics = {d = {d = 0x8150c80}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x811d598, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 129}, decorationAlignment = {i = 132}, textElideMode = Qt::ElideRight, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 16, ht = 16}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = {d = 0x8150c80}, resolve_mask = 0}, showDecorationSelected = true}, features = {i = 0}}, locale = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb6b1c2c0 "QLocale", data = 0xb6b1d460, extradata = 0x0}}, { v = 0x10144, p = {index = 324, numberOptions = 1}}}, widget = 0x89017b0}, index = {r = -1, c = -1, p = 0x0, m = 0x0}, checkState = Qt::Unchecked, icon = { d = 0x0}, text = {static null = {<No data fields>}, static shared_null = { ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x809304a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 52}, alloc = 0, size = 0, data = 0xb6b884b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x8093038, static codecForCStrings = 0x0}, viewItemPosition = QStyleOptionViewItemV4::OnlyOne, backgroundBrush = {d = { d = 0x80f9dc0}}} left = <value optimized out> ratingPainter = {d = 0x0} iconMode = <value optimized out> icon = {<QIcon> = {d = 0xbfffc12c}, d = 0xb6a60d01} #3 0xb74e2664 in QTreeView::drawRow (this=0x89017b0, painter=0xbfffc3bc, option=..., index=...) at itemviews/qtreeview.cpp:1678 headerSection = 0 nextLogicalSection = <value optimized out> prevLogicalSection = <value optimized out> currentLogicalSection = <value optimized out> parent = {r = -1, c = -1, p = 0x0, m = 0x0} spanning = false widgetHasFocus = true columnCount = 1 reverse = false right = 0 alternate = true indexWidgetHasFocus = false modelIndex = {r = 0, c = 0, p = 0x87cf970, m = 0x899a738} y = 1 logicalIndices = {{d = 0x8369090, p = 0x8369090}} d = 0x8b7def0 left = 779 currentRowHasFocus = false width = 779 height = <value optimized out> position = 0 opt = {<QStyleOptionViewItemV3> = {<QStyleOptionViewItemV2> = {<QStyleOptionViewItem> = {<QStyleOption> = {version = 4, type = 12, state = {i = 106753}, direction = Qt::LeftToRight, rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66}, fontMetrics = {d = {d = 0x8150c80}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x811d598, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 129}, decorationAlignment = {i = 132}, textElideMode = Qt::ElideRight, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 16, ht = 16}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = {d = 0x8150c80}, resolve_mask = 0}, showDecorationSelected = true}, features = {i = 0}}, locale = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb6b1c2c0 "QLocale", data = 0xb6b1d460, extradata = 0x0}}, { v = 0x10144, p = {index = 324, numberOptions = 1}}}, widget = 0x89017b0}, index = {r = -1, c = -1, p = 0x0, m = 0x0}, checkState = Qt::Unchecked, icon = { d = 0x0}, text = {static null = {<No data fields>}, static shared_null = { ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x809304a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 52}, alloc = 0, size = 0, data = 0xb6b884b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x8093038, static codecForCStrings = 0x0}, viewItemPosition = QStyleOptionViewItemV4::OnlyOne, backgroundBrush = {d = { d = 0x80f9dc0}}} current = {r = 0, c = 0, p = 0x87cf970, m = 0x899a738} enabled = true allColumnsShowFocus = false hoverRow = <value optimized out> header = 0x8db0148 hover = {r = 0, c = 0, p = 0x87cf970, m = 0x899a738} logicalIndexBeforeLeft = -1 logicalIndexAfterRight = -1 #4 0xb74e54b2 in QTreeView::drawTree (this=0x89017b0, painter=0xbfffc3bc, region=...) at itemviews/qtreeview.cpp:1441 itemHeight = <value optimized out> area = {x1 = 0, y1 = 0, x2 = 778, y2 = 481} i = 0 y = <value optimized out> a = <value optimized out> d = 0x8b7def0 viewItems = {{d = 0x8a32c60, p = 0x8a32c60}} option = {<QStyleOptionViewItemV3> = {<QStyleOptionViewItemV2> = {<QStyleOptionViewItem> = {<QStyleOption> = {version = 4, type = 12, state = {i = 65537}, direction = Qt::LeftToRight, rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 66}, fontMetrics = {d = {d = 0x8150c80}}, palette = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767e140 "QPalette", data = 0xb767e280, extradata = 0x0}}, d = 0x811d598, current_group = 0, resolve_mask = 0}}, displayAlignment = {i = 129}, decorationAlignment = {i = 132}, textElideMode = Qt::ElideRight, decorationPosition = QStyleOptionViewItem::Left, decorationSize = {wd = 16, ht = 16}, font = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f520 "QFont", data = 0xb767f600, extradata = 0x0}}, d = {d = 0x8150c80}, resolve_mask = 0}, showDecorationSelected = false}, features = {i = 0}}, locale = { static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb6b1c2c0 "QLocale", data = 0xb6b1d460, extradata = 0x0}}, { v = 0x10144, p = {index = 324, numberOptions = 1}}}, widget = 0x89017b0}, index = {r = -1, c = -1, p = 0x0, m = 0x0}, checkState = Qt::Unchecked, icon = { d = 0x0}, text = {static null = {<No data fields>}, static shared_null = { ref = {_q_value = 1}, alloc = 0, size = 0, data = 0x809304a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 52}, alloc = 0, size = 0, data = 0xb6b884b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x8093038, static codecForCStrings = 0x0}, viewItemPosition = QStyleOptionViewItemV4::Invalid, backgroundBrush = {d = { d = 0x80f9dc0}}} viewportWidth = 779 drawn = {{d = 0x8093080, p = 0x8093080}} multipleRects = false rects = {{d = 0x8c4ab68, p = 0x8c4ab68}} firstVisibleItemOffset = 0 firstVisibleItem = 0 #5 0xb74e5e3b in QTreeView::paintEvent (this=0x89017b0, event=0xbfffcc44) at itemviews/qtreeview.cpp:1274 d = 0x8b7def0 painter = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0xb767f1a0 "QPainter", data = 0xb767f240, extradata = 0x0}}, d_ptr = {d = 0x867a2f0}} #6 0xb6f808ae in QWidget::event (this=0x89017b0, event=0xbfffcc44) at kernel/qwidget.cpp:8346 d = 0x8b7def0 #7 0xb7370fb3 in QFrame::event (this=0x89017b0, e=0xbfffcc44) at widgets/qframe.cpp:557 result = <value optimized out> #8 0xb73ff062 in QAbstractScrollArea::viewportEvent (this=0x89017b0, e=0xbfffcc44) at widgets/qabstractscrollarea.cpp:1043 No locals. #9 0xb749f5c7 in QAbstractItemView::viewportEvent (this=0x89017b0, event=0xbfffcc44) at itemviews/qabstractitemview.cpp:1619 d = <value optimized out> #10 0xb74e72b3 in QTreeView::viewportEvent (this=0x89017b0, event=0xbfffcc44) at itemviews/qtreeview.cpp:1256 d = <value optimized out> #11 0xb7401955 in viewportEvent (this=0x8b4b808, o=0x8c46748, e=0xbfffcc44) at widgets/qabstractscrollarea_p.h:100 No locals. #12 QAbstractScrollAreaFilter::eventFilter (this=0x8b4b808, o=0x8c46748, e=0xbfffcc44) at widgets/qabstractscrollarea_p.h:116 No locals. #13 0xb6a4c7aa in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x80b89f0, receiver=0x8c46748, event=0xbfffcc44) at kernel/qcoreapplication.cpp:847 obj = 0x890acc8 i = <value optimized out> #14 0xb6f287f0 in QApplicationPrivate::notify_helper (this=0x80b89f0, receiver=0x8c46748, e=0xbfffcc44) at kernel/qapplication.cpp:4441 consumed = <value optimized out> #15 0xb6f2d3cb in QApplication::notify (this=0xbffff1d8, receiver=0x8c46748, e=0xbfffcc44) at kernel/qapplication.cpp:4410 d = 0x80b89f0 res = false #16 0xb7e00d4a in KApplication::notify (this=0xbffff1d8, receiver=0x8c46748, event=0xbfffcc44) at ../../kdeui/kernel/kapplication.cpp:311 No locals. #17 0xb6a4c60b in QCoreApplication::notifyInternal (this=0xbffff1d8, receiver=0x8c46748, event=0xbfffcc44) at kernel/qcoreapplication.cpp:732 threadData = 0x8098eb8 returnValue = <value optimized out> result = false cbdata = {0x8c46748, 0xbfffcc44, 0xbfffcbcf} d = <value optimized out> #18 0xb6f7d62c in sendSpontaneousEvent (this=0x8c48e00, pdev=0x8199fec, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x8199fb0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:218 No locals. #19 QWidgetPrivate::drawWidget (this=0x8c48e00, pdev=0x8199fec, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x8199fb0) at kernel/qwidget.cpp:5433 paintEngine = 0x827a530 e = {<QEvent> = {_vptr.QEvent = 0xb7868850, static staticMetaObject = {d = { superdata = 0x0, stringdata = 0xb6b1f920 "QEvent", data = 0xb6b20300, extradata = 0x0}}, d = 0x0, t = 12, posted = 0, spont = 1, m_accept = 1, reserved = 276}, m_rect = {x1 = 0, y1 = 0, x2 = 778, y2 = 481}, m_region = { d = 0x89af970, static shared_empty = {ref = {_q_value = 345}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, m_erased = false} onScreen = false asRoot = false toBePainted = {d = 0x89af970, static shared_empty = {ref = {_q_value = 345}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}} #20 0xb6f7e29c in QWidgetPrivate::paintSiblingsRecursive (this=0x8b7def0, pdev=0x8199fec, siblings=..., index=<value optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x8199fb0) at kernel/qwidget.cpp:5640 wRegion = {d = 0x89af970, static shared_empty = {ref = {_q_value = 345}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}} w = <value optimized out> boundingRect = {x1 = 3, y1 = 3, x2 = 781, y2 = 484} dirtyBoundingRect = false exludeOpaqueChildren = false wd = 0x8c48e00 hasMask = false Reproducible: Always 1084334 1 pino 2011-02-05 22:35:37 +0000 *** Bug 265548 has been marked as a duplicate of this bug. *** 1085966 2 ahartmetz 2011-02-09 20:52:11 +0000 Please check what Valgrind has to say. Just that a pointer is non-null doesn't mean that it points to memory containing sensible/initialized/not deleted data. 1085977 3 echidnaman 2011-02-09 21:15:19 +0000 I successfully ran a function of the pointee's right before the extend function was called s, so the widget being extended is indeed initialized right before being extended. 1085988 4 echidnaman 2011-02-09 21:35:20 +0000 void ApplicationDelegate::itemActivated(QModelIndex index) { if (index == m_oldIndex) { return; } if (isExtended(m_oldIndex)) { disconnect(m_extender, SIGNAL(infoButtonClicked(Application *)), this, SIGNAL(infoButtonClicked(Application *))); disconnect(m_extender, SIGNAL(installButtonClicked(Application *)), this, SIGNAL(installButtonClicked(Application *))); disconnect(m_extender, SIGNAL(removeButtonClicked(Application *)), this, SIGNAL(removeButtonClicked(Application *))); disconnect(m_extender, SIGNAL(cancelButtonClicked(Application *)), this, SIGNAL(cancelButtonClicked(Application *))); contractItem(m_oldIndex); m_extender->deleteLater(); m_extender = 0; } Application *app = static_cast<const ApplicationProxyModel*>(index.model())->applicationAt(index); QTreeView *view = static_cast<QTreeView*>(parent()); m_extender = new ApplicationExtender(view, app, m_appBackend); connect(m_extender, SIGNAL(infoButtonClicked(Application *)), this, SIGNAL(infoButtonClicked(Application *))); connect(m_extender, SIGNAL(installButtonClicked(Application *)), this, SIGNAL(installButtonClicked(Application *))); connect(m_extender, SIGNAL(removeButtonClicked(Application *)), this, SIGNAL(removeButtonClicked(Application *))); connect(m_extender, SIGNAL(cancelButtonClicked(Application *)), this, SIGNAL(cancelButtonClicked(Application *))); kDebug() << m_extender->sizeHint().height(); extendItem(m_extender, index); m_oldIndex = index; } In a situation where the crash occurs, the kDebug() in the above function gives a correct output of 33. This is also coincidentally the way in which the extender pointer is used internally in kextendableitemdelegate.cpp at line 313. Since the extender pointer is valid right before KExtendableItemDelegate::extendItem() is called, something inside the KExtendableItemDelegate must mess up the pointer. 1086002 5 echidnaman 2011-02-09 21:54:18 +0000 A clue; line 313 in kextendableitemdelegate.cpp is nested inside this if statement: if (isExtended(index)) {} The extender is most definitely not extended at this point, as this crash happens with a totally new view. Here's the valgrind log for posterity: ==2081== Invalid read of size 4 ==2081== at 0x45568E3: KExtendableItemDelegate::extenderRect(QWidget*, QStyleOptionViewItem const&, QModelIndex const&) const (kextendableitemdelegate.cpp:313) ==2081== by 0x4557BA1: KExtendableItemDelegate::paint(QPainter*, QStyleOptionViewItem const&, QModelIndex const&) const (kextendableitemdelegate.cpp:277) ==2081== by 0x806B9ED: ApplicationDelegate::paint(QPainter*, QStyleOptionViewItem const&, QModelIndex const&) const (ApplicationDelegate.cpp:90) ==2081== by 0x53B1C03: QTreeView::drawRow(QPainter*, QStyleOptionViewItem const&, QModelIndex const&) const (qtreeview.cpp:1678) ==2081== by 0x53B4A71: QTreeView::drawTree(QPainter*, QRegion const&) const (qtreeview.cpp:1441) ==2081== by 0x53B53FA: QTreeView::paintEvent(QPaintEvent*) (qtreeview.cpp:1274) ==2081== by 0x4E5068D: QWidget::event(QEvent*) (qwidget.cpp:8346) ==2081== by 0x5240FB2: QFrame::event(QEvent*) (qframe.cpp:557) ==2081== by 0x52CF861: QAbstractScrollArea::viewportEvent(QEvent*) (qabstractscrollarea.cpp:1043) ==2081== by 0x536E9C6: QAbstractItemView::viewportEvent(QEvent*) (qabstractitemview.cpp:1619) ==2081== by 0x53B6872: QTreeView::viewportEvent(QEvent*) (qtreeview.cpp:1256) ==2081== by 0x52D2154: QAbstractScrollAreaFilter::eventFilter(QObject*, QEvent*) (qabstractscrollarea_p.h:100) ==2081== Address 0x38 is not stack'd, malloc'd or (recently) free'd ==2081== Looking at the isExtended() function: bool KExtendableItemDelegate::isExtended(const QModelIndex &index) const { return d->extenders.value(index); } d->extenders is a QHash of indices and QWidget *'s. QHash docs state that if that the key passed to value() is not in the QHash, it will return a default-constructed value. If this default-constructed pointer happens to not be pointing at 0x0 (say, 0x38 maybe), then the return statement will return true even though 0x38 is not a valid pointer. It would be much safer instead to use QHash::contains(key), as it is guaranteed to return false if the key is not present in the QHash. I am running a kdelibs build with this patch to see if this fixes the bug. 1086064 6 echidnaman 2011-02-09 23:43:54 +0000 Hmm, it still happens when using contains(). The Qt docs also say that a default-constructed value for primitive types such as int and pointers default to 0. This does however mean that somehow the KExtendableItemDelegate's internals mapped an invalid QWidget pointer to the index instead of the QWidget pointer provided. 1088306 7 ahartmetz 2011-02-16 03:04:42 +0000 I just had an idea. Check if the index is valid! Maybe there is an extender (or more) with invalid index in the QHash. I might have to add a check for valid index, probably with a kWarning(), to prevent such errors in the future. Generally check if all indices are sane, like they don't change while KExtendableItemDelegate is using them. 1110096 8 cfeck 2011-04-21 15:05:35 +0000 *** Bug 271201 has been marked as a duplicate of this bug. *** 1110150 9 fd.svensson 2011-04-21 19:09:49 +0000 My Muon-updater Work perfectly after some update 19/4-11. 1158003 10 cfeck 2011-08-28 19:46:07 +0000 *** Bug 280941 has been marked as a duplicate of this bug. *** 1159757 11 echidnaman 2011-09-04 20:06:00 +0000 *** Bug 281286 has been marked as a duplicate of this bug. *** 1163597 12 cfeck 2011-09-17 10:25:03 +0000 *** Bug 282176 has been marked as a duplicate of this bug. *** 1166710 13 63942 vladimir.tuboltsev 2011-09-25 07:30:39 +0000 Created attachment 63942 New crash information added by DrKonqi muon-installer (1.2.1 "Caustic Carrionite") on KDE Platform 4.7.1 (4.7.1) using Qt 4.7.4 - What I was doing when the application crashed: I install any of application, then I find the other application and click on him, then muon center's crash. I can repeat this error. -- Backtrace (Reduced): #7 0x00007fa013b73148 in KExtendableItemDelegate::extenderRect (this=0x27f51f0, extender=<optimized out>, option=<optimized out>, index=...) at ../../kdeui/itemviews/kextendableitemdelegate.cpp:313 #8 0x00007fa013b7412d in KExtendableItemDelegate::paint (this=0x27f51f0, painter=0x7fffd798d740, option=..., index=...) at ../../kdeui/itemviews/kextendableitemdelegate.cpp:277 #9 0x000000000042ad37 in ApplicationDelegate::paint (this=0x27f51f0, painter=0x7fffd798d740, option=..., index=...) at /build/buildd/muon-1.2.1/installer/ApplicationModel/ApplicationDelegate.cpp:90 #10 0x00007fa012f0baed in QTreeView::drawRow (this=0x1f75b20, painter=0x7fffd798d740, option=..., index=...) at itemviews/qtreeview.cpp:1678 #11 0x00007fa012f0e5b3 in QTreeView::drawTree (this=0x1f75b20, painter=0x7fffd798d740, region=<optimized out>) at itemviews/qtreeview.cpp:1441 1167285 14 ahartmetz 2011-09-26 19:22:23 +0000 Git commit fc923ff98a3d0aaf0fb57ca480ba022e2978c2ac by Andreas Hartmetz. Committed on 26/09/2011 at 21:14. Pushed by ahartmetz into branch 'KDE/4.7'. Don't use "method static" (ahem) variables for per-instance data. When I wrote that code I didn't know that static data in member functions is "global" - all instances use the same data. So if there is more than one KExtendableItemDelegate in an application, it makes Bad Things happen. At least it is binary compatible to remove the bogus variables. This is officially a brown paper bag bug. Hopefully fixes BUG: 259333 M +26 -21 kdeui/itemviews/kextendableitemdelegate.cpp http://commits.kde.org/kdelibs/fc923ff98a3d0aaf0fb57ca480ba022e2978c2ac 1459687 15 ahartmetz 2014-07-06 15:19:38 +0000 Seems fixed now with the commit from the last comment, please reopen if necessary. 63942 2011-09-25 07:30:39 +0000 2011-09-25 07:30:39 +0000 New crash information added by DrKonqi drkonqireport text/plain 11925 vladimir.tuboltsev QXBwbGljYXRpb246IG11b24taW5zdGFsbGVyICgxLjIuMSAiQ2F1c3RpYyBDYXJyaW9uaXRlIikK S0RFIFBsYXRmb3JtIFZlcnNpb246IDQuNy4xICg0LjcuMSkKUXQgVmVyc2lvbjogNC43LjQKT3Bl cmF0aW5nIFN5c3RlbTogTGludXggMy4wLjAtMTEtZ2VuZXJpYyB4ODZfNjQKRGlzdHJpYnV0aW9u OiBVYnVudHUgb25laXJpYyAoZGV2ZWxvcG1lbnQgYnJhbmNoKQoKLS0gSW5mb3JtYXRpb24gYWJv dXQgdGhlIGNyYXNoOgotIFdoYXQgSSB3YXMgZG9pbmcgd2hlbiB0aGUgYXBwbGljYXRpb24gY3Jh c2hlZDoKCkkgaW5zdGFsbCBhbnkgb2YgYXBwbGljYXRpb24sIHRoZW4gSSBmaW5kIHRoZSBvdGhl ciBhcHBsaWNhdGlvbiBhbmQgY2xpY2sgb24gaGltLCB0aGVuIG11b24gY2VudGVyJ3MgY3Jhc2gu 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