Bug 5624

Summary:	Segmentation fault of gtk/wxGTK within cairo
Product:	cairo	Reporter:	Kostas Karanikolas <k_karanikolas>
Component:	xlib backend	Assignee:	Carl Worth <cworth>
Status:	RESOLVED DUPLICATE	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	high	CC:	nelson178
Version:	1.0.2
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Kostas Karanikolas 2006-01-17 05:38:48 UTC

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

Comment 1 Tom Nelson 2006-04-28 06:03:08 UTC

I can easily reproduce a similar problem with gtk+-2.8.3/examples/paned/paned 
which shows up all yellow on X-Win32 in my environment.  Some of my co-workers 
see teal.  Why is this relavent here?  Because we also have problems with 
Exceed and viewing the Linux on a Solaris and have seen the core dump when 
experimenting with Pseudo Color to try to workaround the situation.  My guess 
is that wrong color issues are related to this seg fault.  See bug 5212.

The color problems we have seen from Cairo affect gtk+, wxwidgets, and QT in 
many situations when the users try to make use of the Cairo dependent in a 
common X-windows use model of running on one machine and viewing on another.  I 
would strongly plead for this bug to be fixed as well as bug 5212.

Comment 2 Chris Wilson 2008-10-10 10:23:30 UTC

The segmentation issue has been fixed so this becomes a simple dup of 5212 (which I haven't yet worked out if has been fixed...)

*** This bug has been marked as a duplicate of bug 5212 ***

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