Comment 2 for bug 1273693

StacktraceTop:
 gray_render_scanline (worker=0x1, worker@entry=0x22b8bd0, ey=ey@entry=3, x1=x1@entry=9151, y1=-288, y1@entry=256, x2=x2@entry=9792, y2=y2@entry=48) at /build/buildd/freetype-2.5.2/freetype-2.5.2/src/smooth/ftgrays.c:753
 gray_render_line (worker=0x22b8bd0, to_x=9792, to_y=816) at /build/buildd/freetype-2.5.2/freetype-2.5.2/src/smooth/ftgrays.c:901
 gray_line_to (to=<optimized out>, worker=<optimized out>) at /build/buildd/freetype-2.5.2/freetype-2.5.2/src/smooth/ftgrays.c:1200
 FT_Outline_Decompose (outline=outline@entry=0x22b92f8, func_interface=func_interface@entry=0x7fbcd0c8cde0 <func_interface>, user=user@entry=0x22b8bd0) at /build/buildd/freetype-2.5.2/freetype-2.5.2/src/base/ftoutln.c:161
 gray_convert_glyph_inner (worker=worker@entry=0x22b8bd0) at /build/buildd/freetype-2.5.2/freetype-2.5.2/src/smooth/ftgrays.c:1791