DrMemory and Qt5

[Carlsberg]

I was using this DrMemory program to check for memory leaks, and only from starting and closing the application I get about 160 leak reports, all in the same place: QLocalePrivate::decimal. They look like this

Error #3936: LEAK 12 direct bytes 0x0290ad38-0x0290ad44 + 0 indirect bytes
# 0 Qt5Core.dll!QLocalePrivate::decimal           +0x24     (0x5b1f3e45 <Qt5Core.dll+0x23e45>)
# 1 Qt5Gui.dll!QCss::ValueExtractor::extractBox   +0xf3     (0x5aecced4 <Qt5Gui.dll+0xfced4>)
# 2 Qt5Widgets.dll!QStyleSheetStyle::renderRule   +0x235    (0x5aa16186 <Qt5Widgets.dll+0x86186>)
# 3 Qt5Widgets.dll!QStyleSheetStyle::setGeometry  +0x31     (0x5aa16d02 <Qt5Widgets.dll+0x86d02>)
# 4 Qt5Widgets.dll!QStyleSheetStyle::polish       +0xe2     (0x5aa14623 <Qt5Widgets.dll+0x84623>)
# 5 Qt5Widgets.dll!QStyleSheetStyle::unsetPalette +0x421    (0x5aa1dfd2 <Qt5Widgets.dll+0x8dfd2>)
# 6 Qt5Widgets.dll!QStyleSheetStyle::repolish     +0x8b     (0x5aa16b6c <Qt5Widgets.dll+0x86b6c>)
# 7 Qt5Widgets.dll!QWidget::setStyleSheet

Error #3936: LEAK 12 direct bytes 0x0290ad38-0x0290ad44 + 0 indirect bytes
# 0 Qt5Core.dll!QLocalePrivate::decimal           +0x24     (0x5b1f3e45 <Qt5Core.dll+0x23e45>)
# 1 Qt5Gui.dll!QCss::ValueExtractor::extractBox   +0xf3     (0x5aecced4 <Qt5Gui.dll+0xfced4>)
# 2 Qt5Widgets.dll!QStyleSheetStyle::renderRule   +0x235    (0x5aa16186 <Qt5Widgets.dll+0x86186>)
# 3 Qt5Widgets.dll!QStyleSheetStyle::setGeometry  +0x31     (0x5aa16d02 <Qt5Widgets.dll+0x86d02>)
# 4 Qt5Widgets.dll!QStyleSheetStyle::polish       +0xe2     (0x5aa14623 <Qt5Widgets.dll+0x84623>)
# 5 Qt5Widgets.dll!QStyleSheetStyle::unsetPalette +0x421    (0x5aa1dfd2 <Qt5Widgets.dll+0x8dfd2>)
# 6 Qt5Widgets.dll!QStyleSheetStyle::repolish     +0x8b     (0x5aa16b6c <Qt5Widgets.dll+0x86b6c>)
# 7 Qt5Widgets.dll!QWidget::setStyleSheet

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ERRORS FOUND:
      3 unique,     8 total unaddressable access(es)
   3821 unique, 59963 total uninitialized access(es)
      0 unique,     0 total invalid heap argument(s)
      0 unique,     0 total GDI usage error(s)
      0 unique,     0 total warning(s)
    165 unique,   993 total,  50180 byte(s) of leak(s)
      4 unique,     4 total,   9356 byte(s) of possible leak(s)
ERRORS IGNORED:
    905 still-reachable allocation(s)
         (re-run with "-show_reachable" for details)

ERRORS FOUND:
      3 unique,     8 total unaddressable access(es)
   3821 unique, 59963 total uninitialized access(es)
      0 unique,     0 total invalid heap argument(s)
      0 unique,     0 total GDI usage error(s)
      0 unique,     0 total warning(s)
    165 unique,   993 total,  50180 byte(s) of leak(s)
      4 unique,     4 total,   9356 byte(s) of possible leak(s)
ERRORS IGNORED:
    905 still-reachable allocation(s)
         (re-run with "-show_reachable" for details)

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The stacks are various, but they all end up in QLocalePrivate::decimal.

Is this a real problem?

Thank you

[Lykurg]

Hm,

QChar decimal() const { return QChar(m_data->m_decimal); }

QChar decimal() const { return QChar(m_data->m_decimal); }

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don't looks like that could be a memory leak.

[Carlsberg]

Yeah, I end up there too, but I'm not familiar with the Qt code too much, that's why I was wondering.