Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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6.1.0
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None
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Linux/X11
Description
When checking our application for memory leaks, we found some memory not freed by the QXcbWindows, e.g.:
==1740269== 47 bytes in 5 blocks are still reachable in loss record 27 of 95 ==1740269== at 0x483E77F: malloc (vg_replace_malloc.c:307) ==1740269== by 0x90456E4: _XlcAddCT (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x9045948: _XlcInitCTInfo (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x904BC83: ??? (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x904B332: ??? (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x904BB78: _XlcCreateLC (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x906CF11: _XlcUtf8Loader (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x905319D: _XOpenLC (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x905347B: XmbTextListToTextProperty (in /usr/lib/libX11.so.6.4.0) ==1740269== by 0x8F18F4C: QXcbWindow::setWindowTitle(QXcbConnection const*, unsigned int, QString const&) (in /local/ssd/mlangen/build/a3gui.default/usr/lib/libQt6XcbQpa.so.6.1.0) ==1740269== by 0x8EE326B: QXcbConnection::getQtSelectionOwner() (in /local/ssd/mlangen/build/a3gui.default/usr/lib/libQt6XcbQpa.so.6.1.0) ==1740269== by 0x8F0F83E: QXcbVirtualDesktop::subscribeToXFixesSelectionNotify() (in /local/ssd/mlangen/build/a3gui.default/usr/lib/libQt6XcbQpa.so.6.1.0)
You can trigger the output by using valgrind with the --leak-check=full --show-leak-kinds=all options on the following program:
#include <QApplication> #include <QTimer> int main(int argc, char **argv) { QApplication app(argc, argv); QTimer::singleShot(1000, qApp, &QApplication::quit); return app.exec(); }
It looks like the memory allocated with XmbTextListToTextProperty in the method qstringToXTP() in ./qtbase/src/plugins/platforms/xcb/qxcbwindow.cpp is never XFree'd when a QXcbWindow is destroyed.