[cairo-bugs] [Bug 5624] New: Segmentation fault of gtk/wxGTK within cairo

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https://bugs.freedesktop.org/show_bug.cgi?id=5624          
     
           Summary: Segmentation fault of gtk/wxGTK within cairo
           Product: cairo
           Version: 1.0.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: xlib backend
        AssignedTo: cworth at cworth.org
        ReportedBy: k_karanikolas at hotmail.com
         QAContact: cairo-bugs at cairographics.org


I've noticed a consistent crash of a unicode gtk/wxGtk application in cairo. The
backtrace appears simillar to bug 4505, however the application works fine until
, what I'm guessing is an unknown unicode string needs to get rendered, when
this crash occurs.

I'm running this application within XVnc (tightvnc 1.3_alpha7) and the server
should be running in 16-bit color (and not 8-bit pseudocolor as mentioned in bug
4505), but it could be related.

Thanks.

The other related libs are:
gtk+-2.8.10
pango-1.10.2
glib-2.8.5
freetype-2.1.9

Here's what's xdpyinfo reports:
version number:    11.0
vendor string:    AT&T Laboratories Cambridge
vendor release number:    3332
maximum request size:  4194300 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    2
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0x3400009, revert to PointerRoot
number of extensions:    7
    BIG-REQUESTS
    MIT-SHM
    MIT-SUNDRY-NONSTANDARD
    SHAPE
    SYNC
    XC-MISC
    XTEST
default screen number:    0
number of screens:    1

screen #0:
  dimensions:    1280x1024 pixels (433x347 millimeters)
  resolution:    75x75 dots per inch
  depths (1):    16
  root window id:    0x25
  depth of root window:    16 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x21
  default number of colormap cells:    64
  preallocated pixels:    black 0, white 65535
  options:    backing-store YES, save-unders YES
  largest cursor:    1280x1024
  current input event mask:    0xfa4031
    KeyPressMask             EnterWindowMask          LeaveWindowMask
    KeymapStateMask          StructureNotifyMask      SubstructureNotifyMask
    SubstructureRedirectMask FocusChangeMask          PropertyChangeMask
    ColormapChangeMask
  number of visuals:    1
  default visual id:  0x22
  visual:
    visual id:    0x22
    class:    TrueColor
    depth:    16 planes
    available colormap entries:    64 per subfield
    red, green, blue masks:    0xf800, 0x7e0, 0x1f
    significant bits in color specification:    8 bits



And here is the backtrace:
--------------------------------------------
#0  0xb709a232 in _cairo_ft_scaled_font_show_glyphs (abstract_font=0x970e2f0,
operator=CAIRO_OPERATOR_CLEAR, pattern=0xbf9a8ee0,
    surface=0x96f04f0, source_x=0, source_y=0, dest_x=112, dest_y=9, width=138,
height=13, glyphs=0x96864a8, num_glyphs=9)
    at cairo-ft-font.c:1988
#1  0xb708555f in _cairo_scaled_font_show_glyphs (scaled_font=0x970e2f0,
operator=CAIRO_OPERATOR_OVER, pattern=0xbf9a8ee0,
    surface=0x96f04f0, source_x=112, source_y=9, dest_x=112, dest_y=9,
width=138, height=13, glyphs=0x96864a8, num_glyphs=9)
    at cairo-font.c:940
#2  0xb7088d5d in _cairo_gstate_show_glyphs_draw_func (closure=0xbf9a8ec0,
operator=CAIRO_OPERATOR_CLEAR, src=0xbf9a8ee0, dst=0x0,
    dst_x=0, dst_y=0, extents=0xbf9a8eb8) at cairo-gstate.c:2053
#3  0xb70876f8 in _cairo_gstate_clip_and_composite (clip=0x96eff6c,
operator=CAIRO_OPERATOR_OVER, src=0xbf9a8ee0,
    draw_func=0xb7088c80 <_cairo_gstate_show_glyphs_draw_func>,
draw_closure=0xbf9a8ec0, dst=0x96f04f0, extents=0xbf9a8eb8)
    at cairo-gstate.c:1094
#4  0xb7088f8e in _cairo_gstate_show_glyphs (gstate=0x96efee8,
glyphs=0xbf9a8fc0, num_glyphs=9) at cairo-gstate.c:2131
#5  0xb7082073 in cairo_show_glyphs (cr=0x97c02a8, glyphs=0x96eed78,
num_glyphs=0) at cairo.c:2158
#6  0xb70bf312 in pango_cairo_renderer_get_type () from
/usr/lib/libpangocairo-1.0.so.0
#7  0xb730d279 in pango_renderer_draw_glyphs () from /usr/lib/libpango-1.0.so.0
#8  0xb70bf807 in pango_cairo_show_glyph_string () from
/usr/lib/libpangocairo-1.0.so.0
#9  0xb73708b0 in gdk_pango_renderer_get_type () from /usr/lib/libgdk-x11-2.0.so.0
#10 0xb730d279 in pango_renderer_draw_glyphs () from /usr/lib/libpango-1.0.so.0
#11 0xb730d140 in pango_renderer_draw_layout_line () from /usr/lib/libpango-1.0.so.0
#12 0xb730c84b in pango_renderer_draw_layout () from /usr/lib/libpango-1.0.so.0
#13 0xb7371f45 in gdk_draw_layout_with_colors () from /usr/lib/libgdk-x11-2.0.so.0
#14 0xb7372151 in gdk_draw_layout () from /usr/lib/libgdk-x11-2.0.so.0          
     
     
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