QtWebKit crashes on pro-linux.de

Going to pro-linux.de causes a crash in the Harfbuzz-ng code. This even on gerrit stable with the patch for QTBUG-36099 applied.

pure virtual method called
terminate called without an active exception

Program received signal SIGABRT, Aborted.
0x00007fffea866295 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 0x00007fffea866295 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007fffea869438 in __GI_abort () at abort.c:90
#2 0x00007fffeb153c8d in _gnu_cxx::_verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3 0x00007fffeb151cf6 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4 0x00007fffeb151d41 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5 0x00007fffeb15280f in __cxa_pure_virtual () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6 0x00007fffec2e5aae in QTextEngine::shapeText (this=this@entry=0x99d1f0, item=item@entry=1) at text/qtextengine.cpp:928
#7 0x00007fffec2e64d5 in QTextEngine::shape (this=this@entry=0x99d1f0, item=item@entry=1) at text/qtextengine.cpp:1403
#8 0x00007fffec2eb59d in QTextEngine::shapeLine (this=0x99d1f0, line=...) at text/qtextengine.cpp:857
#9 0x00007fffec2f69c8 in QTextLine::cursorToX (this=this@entry=0x7fffffffae70, cursorPos=cursorPos@entry=0x7fffffffae38,
edge=edge@entry=QTextLine::Leading) at text/qtextlayout.cpp:2589
#10 0x00007ffff5a25eda in cursorToX (edge=QTextLine::Leading, cursorPos=0, this=0x7fffffffae70)
at /src/qt5/qtbase/include/QtGui/../../src/gui/text/qtextlayout.h:233
#11 WebCore::Font::floatWidthForComplexText (this=this@entry=0x7fff5e428eb0, run=...)
at /src/webkit-qt5x2/Source/WebCore/platform/graphics/qt/FontQt.cpp:203
#12 0x00007ffff5a06a01 in WebCore::Font::width (this=this@entry=0x7fff5e428eb0, run=..., fallbackFonts=fallbackFonts@entry=0x7fffffffb1a0,
glyphOverflow=<optimized out>, glyphOverflow@entry=0x7fffffffb180) at /src/webkit-qt5x2/Source/WebCore/platform/graphics/Font.cpp:311
#13 0x00007ffff5c0e264 in widthFromCache (glyphOverflow=0x7fffffffb180, fallbackFonts=0x7fffffffb1a0, xPos=5, len=5, start=1, f=..., this=0x7fff6b502f50)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderText.cpp:769
#14 WebCore::RenderText::computePreferredLogicalWidths (this=this@entry=0x7fff6b502f50, leadWidth=0, fallbackFonts=..., glyphOverflow=...)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderText.cpp:1064
#15 0x00007ffff5c0fc52 in WebCore::RenderText::computePreferredLogicalWidths (this=0x7fff6b502f50, leadWidth=<optimized out>)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderText.cpp:886
#16 0x00007ffff5c0a6fe in WebCore::RenderText::trimmedPrefWidths (this=this@entry=0x7fff6b502f50, leadWidth=leadWidth@entry=0,
beginMinW=@0x7fffffffb358: 41, beginWS=@0x7fffffffb34e: false, endMinW=@0x7fffffffb35c: 41, endWS=@0x7fffffffb34f: false,
hasBreakableChar=@0x7fffffffb34c: true, hasBreak=@0x7fffffffb34d: false, beginMaxW=@0x7fffffffb360: 1.22077359e+36, endMaxW=@0x7fffffffb390: 0,
minW=@0x7fffffffb350: 0, maxW=@0x7fffffffb354: 0, stripFrontSpaces=@0x7fffffffb34b: true)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderText.cpp:784
#17 0x00007ffff5aece91 in WebCore::RenderBlock::computeInlinePreferredLogicalWidths (this=this@entry=0x7fff6b502ea0, minLogicalWidth=...,
maxLogicalWidth=...) at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBlock.cpp:6304
#18 0x00007ffff5aedda6 in WebCore::RenderBlock::computeIntrinsicLogicalWidths (this=0x7fff6b502ea0, minLogicalWidth=..., maxLogicalWidth=...)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBlock.cpp:5924
#19 0x00007ffff5adda87 in WebCore::RenderBlock::computePreferredLogicalWidths (this=0x7fff6b502ea0)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBlock.cpp:5961
#20 0x00007ffff5b19763 in WebCore::RenderBox::minPreferredLogicalWidth (this=0x7fff6b502ea0)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBox.cpp:861
#21 0x00007ffff5ae70ad in WebCore::RenderBlock::computeBlockPreferredLogicalWidths (this=0x7fff6b502de0, minLogicalWidth=..., maxLogicalWidth=...)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBlock.cpp:6460
#22 0x00007ffff5aedf05 in WebCore::RenderBlock::computeIntrinsicLogicalWidths (this=0x7fff6b502de0, minLogicalWidth=..., maxLogicalWidth=...)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBlock.cpp:5926
#23 0x00007ffff5adda87 in WebCore::RenderBlock::computePreferredLogicalWidths (this=0x7fff6b502de0)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBlock.cpp:5961
#24 0x00007ffff5b19763 in WebCore::RenderBox::minPreferredLogicalWidth (this=0x7fff6b502de0)
at /src/webkit-qt5x2/Source/WebCore/rendering/RenderBox.cpp:861
#25 0x00007ffff5ae70ad in WebCore::RenderBlock::computeBlockPreferredLogicalWidths (this=0x7fff6b522a90, minLogicalWidth=..., maxLogicalWidth=...)