[Webkit-unassigned] [Bug 191805] Segfaults on https://terminalizer.com/

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191805

--- Comment #12 from Michael Catanzaro <mcatanzaro at igalia.com> ---
First two frames with an -Og build:

#0  0x00007fc93ea70d61 in WebCore::harfBuzzGetGlyph (fontData=<optimized out>, unicode=<optimized out>, 
    glyph=0x7ffccfbdf288)
    at /home/mcatanzaro/Projects/WebKit/Source/WebCore/platform/graphics/harfbuzz/HarfBuzzFaceCairo.cpp:107
        glyphs = 0x7416370
        numGlyphs = 1
        buffer = "​"
        bufferLength = <optimized out>
        hbFontData = <optimized out>
        scaledFont = 0x73b3590
        result = {
          iterator = {<std::iterator<std::forward_iterator_tag, WTF::KeyValuePair<unsigned int, unsigned int>, long, WTF::KeyValuePair<unsigned int, unsigned int>*, WTF::KeyValuePair<unsigned int, unsigned int>&>> = {<No data fields>}, 
            m_iterator = {<std::iterator<std::forward_iterator_tag, WTF::KeyValuePair<unsigned int, unsigned int>, long, WTF::KeyValuePair<unsigned int, unsigned int> const*, WTF::KeyValuePair<unsigned int, unsigned int> const&>> = {<No data fields>}, m_position = 0x0, m_endPosition = <optimized out>}}, 
          isNewEntry = <optimized out>}
#1  0x00007fc9397645df in hb_font_t::get_nominal_glyph (glyph=0x7ffccfbdf288, unicode=0, 
    this=<optimized out>) at hb-font-private.hh:211
No locals.


m_position = 0x0 looks suspicious to me.

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