Thread 1 (Thread 0x7fffcf98f980 (LWP 26954)):
#0 0x00007fffddc44348 in convertIndexedToARGB32PM(unsigned int*, unsigned int const*, int, QVector<unsigned int> const*, QDitherInfo*) () at /lib64/libQt5Gui.so.5
#1 0x00007fffddc4e581 in blend_untransformed_generic(int, QT_FT_Span_ const*, void*) () at /lib64/libQt5Gui.so.5
#2 0x00007fffddc7b6c6 in fillRect_normalized(QRect const&, QSpanData*, QRasterPaintEnginePrivate*) () at /lib64/libQt5Gui.so.5
#3 0x00007fffddc80d9d in QRasterPaintEngine::drawImage(QRectF const&, QImage const&, QRectF const&, QFlags<Qt::ImageConversionFlag>) [clone .part.109] () at /lib64/libQt5Gui.so.5
#4 0x00007fffddc9a3b7 in QPainter::drawImage(QRectF const&, QImage const&, QRectF const&, QFlags<Qt::ImageConversionFlag>) () at /lib64/libQt5Gui.so.5
#5 0x00007fffea6f5ef8 in QwtPainter::drawImage(QPainter*, QRectF const&, QImage const&) (image=..., r=<synthetic pointer>, this=0x7fffffffb540) at /usr/include/qt5/QtGui/qpainter.h:848
#6 0x00007fffea6f5ef8 in QwtPainter::drawImage(QPainter*, QRectF const&, QImage const&) (painter=painter@entry=0x7fffffffb540, rect=..., image=...) at ../../qwt-6.1/src/qwt_painter.cpp:665
#7 0x00007fffea7581b2 in QwtPlotRasterItem::draw(QPainter*, QwtScaleMap const&, QwtScaleMap const&, QRectF const&) const (this=<optimized out>, painter=0x7fffffffb540, xMap=..., yMap=..., canvasRect=...) at ../../qwt-6.1/src/qwt_plot_rasteritem.cpp:761
yInterval = {d_minValue = 9750, d_maxValue = 10750, d_borderFlags = {i = 2}}
paintRect = {xp = 0, yp = 0, w = 1229, h = 714}
area = {xp = 0, yp = 9750, w = 500, h = 1000}
imageRect = {xp = 0, yp = 1, w = 1228, h = 713}
yyMap = {d_s1 = 9750, d_s2 = 10750, d_p1 = 713, d_p2 = 0, d_cnv = -0.71299999999999997, d_ts1 = 9750, d_transform = 0x0}
xInterval = {d_minValue = 0, d_maxValue = 500, d_borderFlags = {i = 2}}
xxMap = {d_s1 = 0, d_s2 = 500, d_p1 = 0, d_p2 = 1228, d_cnv = 2.456, d_ts1 = 0, d_transform = 0x0}
br = {xp = 0, yp = 9750, w = 500, h = 1000}
image = <incomplete type>
pixelRect = {xp = 0, yp = 9750, w = 2, h = 7.8125}
#8 0x00007fffea740495 in QwtPlotSpectrogram::draw(QPainter*, QwtScaleMap const&, QwtScaleMap const&, QRectF const&) const (this=this@entry=0xd92010, painter=painter@entry=0x7fffffffb540, xMap=..., yMap=..., canvasRect=...) at ../../qwt-6.1/src/qwt_plot_spectrogram.cpp:645
#9 0x00007fffea721c00 in QwtPlot::drawItems(QPainter*, QRectF const&, QwtScaleMap const*) const (this=<optimized out>, painter=0x7fffffffb540, canvasRect=..., maps=0x7fffffffb320) at ../../qwt-6.1/src/qwt_plot.cpp:790
item = 0xd92010
it = {i = 0xd92b18}
itmList = @0xaf5e50: {<QListSpecialMethods<QwtPlotItem*>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {_M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0xd92b00}, d = 0xd92b00}}
#10 0x00007fffea721e75 in QwtPlot::drawCanvas(QPainter*) (this=0x976300, painter=0x7fffffffb540) at ../../qwt-6.1/src/qwt_plot.cpp:755
maps = {{d_s1 = 9750, d_s2 = 10750, d_p1 = 713, d_p2 = 0, d_cnv = -0.71299999999999997, d_ts1 = 9750, d_transform = 0x0}, {d_s1 = -0.021730000153183937, d_s2 = 1.2283560037612915, d_p1 = 713, d_p2 = 0, d_cnv = -570.36075739376076, d_ts1 = -0.021730000153183937, d_transform = 0x0}, {d_s1 = 0, d_s2 = 500, d_p1 = 0, d_p2 = 1228, d_cnv = 2.456, d_ts1 = 0, d_transform = 0x0}, {d_s1 = 0, d_s2 = 1000, d_p1 = 0, d_p2 = 1228, d_cnv = 1.228, d_ts1 = 0, d_transform = 0x0}}
#11 0x00007fffea75176a in QwtPlotCanvas::drawCanvas(QPainter*, bool) (this=this@entry=0xa9ba40, painter=painter@entry=0x7fffffffb540, withBackground=withBackground@entry=false) at ../../qwt-6.1/src/qwt_plot_canvas.cpp:920
hackStyledBackground = <optimized out>
#12 0x00007fffea75398e in QwtPlotCanvas:
aintEvent(QPaintEvent*) (this=0xa9ba40, event=<optimized out>) at ../../qwt-6.1/src/qwt_plot_canvas.cpp:761
p = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7fffdddc5de0, data = 0x7fffdddc5d20, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xea0290}}
bs = @0xa9b4b0: <incomplete type>
pixelRatio = <optimized out>
painter = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7fffdddc5de0, data = 0x7fffdddc5d20, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xb81410}}
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