(gdb) bt
#0  0x00007fae503af8ba in QDashStroker::processCurrentSubpath() (t=0, this=0x7ffe38a2f320) at ../../src/corelib/tools/qline.h:364
#1  0x00007fae503af8ba in QDashStroker::processCurrentSubpath() (this=0x1eb5670) at painting/qstroker.cpp:1220
#2  0x00007fae503af060 in QStrokerOps::end() (this=this@entry=0x1eb5670)
    at painting/qstroker.cpp:219
#3  0x00007fae503b4689 in QDashStroker::end() (this=0x1eb5670)
    at ../../src/gui/painting/qstroker_p.h:380
#4  0x00007fae5033926f in QPaintEngineEx::stroke(QVectorPath const&, QPen const&) (this=this@entry=0x1e8f540, path=..., pen=...)
    at painting/qpaintengineex.cpp:502

(gdb) frame 4
#4  0x00007fae5033926f in QPaintEngineEx::stroke (this=this@entry=0x1e8f540, 
    path=..., pen=...) at painting/qpaintengineex.cpp:502
502	        d->activeStroker->end();

(gdb) print path
(const QVectorPath &) @0x7ffe38a2f710: {m_elements = 0x0, 
  m_points = 0x2027c18, m_count = 421, m_hints = 3, m_cp_rect = {x1 = 19, 
    y1 = 1.6513144223376483e-316, x2 = 0, y2 = 5.9203682607406943e-312}, 
  m_cache = 0x0}

(gdb) print path->m_points[0]@(421*2)

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  148.3353943735969, 651.02084066525106, 148.36190426912498, 
  653.04037045262157, 148.39067851098309, 655.10189660989749, 
  148.42175849044821, 657.2071544869334, 148.45519777270238, 
  659.3580235138835, 148.4910377490225, 661.55646769993143, 
  148.52933563676217, 663.8046091531844, 148.57013769676033, 
  666.10470253562482, 148.6135060159325, 668.4591208887241, 
  148.65949415946068, 670.87046529023348, 148.70816502585404, 
  673.34147669261608, 148.75958029623126, 675.87515290067427, 
  148.81380976764763, 678.47463502069718, 148.87091796179968, 
  681.14339375239433, 148.93098360327309, 683.88509543315718, 
  148.99407932970101, 686.70373038634784, 149.06028711204377, 
  689.60367304561839, 149.12969176183955, 692.58960687739295, 
  149.20238377178217, 695.66661721530897, 149.2784552577528, 
  698.84029904785757, 149.35800563997563, 702.11676293735798, 
  149.44114083142412, 705.50266274567991, 149.52797080304015, 
  709.00534734690518, 149.61861161271798, 712.63292199774651, 
  149.71318662269505, 716.39428696664436, 149.81182852853576, 
  720.29938332696963, 149.91467489536669, 724.35921974817097, 
  150.02187262164142, 728.58615131062481, 150.13357753334407, 
  732.99396299432738, 150.24995803616036, 737.5982322939617, 
  150.37118943432233, 742.41650678813198, 150.49745636538916, 
  747.46891597440731, 150.62896537994902, 752.77826036546389, 
  150.76592424598056, 758.37085759090826, 150.90856264449147, 
  764.27712307982404, 151.05711999561339, 770.53257317118084, 
  151.21185357453868, 777.17870984475405, 151.37303161297416, 
  784.26483504255975, 151.54094384985882, 785, inf}

(gdb) print *(pen->d)
{ref = {<QAtomicInteger<int>> = {<QBasicAtomicInteger<int>> = {
        _q_value = 4}, <No data fields>}, <No data fields>}, width = 1.5, 
  brush = {d = {d = 0x2175d90}}, style = Qt::DashLine, 
  capStyle = Qt::SquareCap, joinStyle = Qt::BevelJoin, dashPattern = {
    d = 0x1efcff0}, dashOffset = 0, miterLimit = 2, cosmetic = 0, 
  defaultWidth = 0}