Debug backtrace for the crash:

#0  0xb790284a in png_zalloc (png_ptr=0x820ce90, items=15, size=3079792265) at 
png.c:155
155     png.c: No such file or directory.
        in png.c
(gdb) thread apply all bt full

Thread 1 (process 4967):
#0  0xb790284a in png_zalloc (png_ptr=0x820ce90, items=15, size=3079792265) at 
png.c:155
        ptr = <value optimized out>
        save_flags = <value optimized out>
#1  0xb79570d3 in inflateInit_ () from /usr/lib/libz.so.1
No symbol table info available.
#2  0xb7910547 in png_create_read_struct_2 (user_png_ver=0xb7091f2e "d", 
error_ptr=0xbfb9eb84, 
    error_fn=0xb7090f00 <png_simple_error_callback+48>, warn_fn=0xb7090510 
<png_simple_warning_callback>, mem_ptr=0x0, 
    malloc_fn=0xb7091b40 <gdk_pixbuf__png_image_load>, free_fn=0xb70905d0 
<png_free_callback>) at pngread.c:144
        png_ptr = (png_structp) 0x820cdc0
#3  0xb7091bd7 in gdk_pixbuf__png_image_load (f=0x8215020, error=0xbfb9eb84) at 
io-png.c:285
        pixbuf = (GdkPixbuf * volatile) 0x0
        png_ptr = (png_structp) 0xb7f082d0
        info_ptr = (png_infop) 0xbfb9e438
        text_ptr = <value optimized out>
        i = <value optimized out>
        ctype = <value optimized out>
        w = <value optimized out>
        h = <value optimized out>
        rows = (volatile png_bytepp) 0x0
        num_texts = <value optimized out>
        key = <value optimized out>
        value = <value optimized out>
#4  0xb78b6e90 in _gdk_pixbuf_generic_image_load (module=0x820c9f8, 
f=0x8215020, error=0xbfb9eb84) at gdk-pixbuf-io.c:793
        buffer = 
"\bv\001\000�s\001\000\000�U��_W�x�\017\b*�\033\bHԹ��\2138�XԹ��MQ��\bJ�H\000\000\000xԹ�\006\037\237�4u\017\b�\2138�xԹ��MQ���\033\b�Թ�XqW�XqW�PqW�
 qW�\000�\033\b\001\002\000\000\020\000\000\000(qW���\033\bP", '\0' <repeats 11 
times>, "�Թ��'J� 
qW�\000\002\000\000�\001\000\000�_W�\000\000\000\000�\001\000\000�Թ�8)J�\000\002\000\000�\034J�`�\033\b\002\000\000\000\000\002\000\000\f\000\000\000Hչ�G�\201�8"...
        length = <value optimized out>
        pixbuf = (GdkPixbuf *) 0x0
        animation = <value optimized out>
        context = <value optimized out>
        locked = 0
#5  0xb78b7f04 in IA__gdk_pixbuf_new_from_file (filename=0x820b858 
"/usr/share/gdm/themes/Human/background.png", 
    error=0xbfb9eb84) at gdk-pixbuf-io.c:906
        pixbuf = <value optimized out>
        f = (FILE *) 0x8215020
        buffer = "[EMAIL 
PROTECTED]|\bd\210\000\000\000\tpHYs\000\000\r�\000\000\r�\001B(\233x\000\000\000\031tEXtSoftware\000www.inkscape.org\233�<\032\000\000
 
\000IDATx\234�}[��*\017$\234o\217���\223����\207$\016\027U�\004�\222,��W\002�\222\000\031;Զ\235����?\217\224RJ9\025���\227\\~$X�i7�~��\027�E�8��z\003U}Ǭ\036g\026"...
        image_module = (GdkPixbufModule *) 0x820c9f8
        display_name = (gchar *) 0x82154e0 
"/usr/share/gdm/themes/Human/background.png"
        __PRETTY_FUNCTION__ = "IA__gdk_pixbuf_new_from_file"
#6  0x0805e774 in ?? ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#7  0x0820b858 in ?? ()
No symbol table info available.
#8  0xbfb9eb84 in ?? ()
No symbol table info available.
#9  0x0804e84c in [EMAIL PROTECTED] ()
No symbol table info available.
#10 0x0804ec5c in [EMAIL PROTECTED] ()
No symbol table info available.
#11 0x08215910 in ?? ()
No symbol table info available.
#12 0x08215bf8 in ?? ()
No symbol table info available.
#13 0x08214f88 in ?? ()
No symbol table info available.
#14 0x00000000 in ?? ()
No symbol table info available.


** Changed in: libpng (Ubuntu)
Sourcepackagename: gdm => libpng
   Importance: Undecided => Medium

-- 
[apport] gdmgreeter crashed with SIGILL in inflateInit2_()
https://launchpad.net/bugs/91756

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