.
Thread 1 (process 6945):
#0  0xb7f1bd2b in IA__g_logv (log_domain=<value optimized out>, log_level=G_LOG_LEVEL_ERROR, format=0xb7f64990 "file %s: line %d (%s): assertion failed: (%s)", 
    args1=0xbfdbce2c "Þ¥\004\bÌ") at /build/buildd/glib2.0-2.13.7/glib/gmessages.c:493
	buffer = "¿|Ñ\004\b\000\000\000\000\000\000\000\000\002", '\0' <repeats 11 times>, "\004\000\000\000\034\"Ó·ô!Ó·ô¿ü·î\037>æ\001\000\000\200¤ÊÛ¿xÊÛ¿¬ËÛ¿ Ð\004\bðËÛ¿\205\201\227¡", '\0' <repeats 12 times>, "\214ÊÛ¿ä\031ü·`Âü·PÊÛ¿äÊÛ¿\000ËÛ¿`Âü·\000\000\000\000äÊÛ¿ðËÛ¿\001\000\000\200¤,ï·\020ii\rX\tì·\234ÊÛ¿\033\234û·ö}Ø·\232,ï·\\\rû·L\rû·<Ô×·\002\000Û¿©ìû·\027,ï·X\rû·ô¿ü·àÊÛ¿\204\bì·\024ËÛ¿Ð\237"...
	depth = <value optimized out>
	domain = <value optimized out>
	data = (gpointer) 0x0
	log_func = (GLogFunc) 0xb7f1c880 <IA__g_log_default_handler>
	domain_fatal_mask = 5
	test_level = <value optimized out>
	was_recursion = 0
	i = <value optimized out>
#1  0xb7f1bfa9 in IA__g_log (log_domain=0x0, log_level=G_LOG_LEVEL_ERROR, format=0xb7f64990 "file %s: line %d (%s): assertion failed: (%s)")
    at /build/buildd/glib2.0-2.13.7/glib/gmessages.c:517
	args = 0xbfdbce2c "Þ¥\004\bÌ"
#2  0xb7f1c026 in IA__g_assert_warning (log_domain=0x0, file=0x804a5de "tracker-thumbnailer.c", line=204, pretty_function=0x804a95c "main", 
    expression=0x804a758 "(fp = g_fopen (thumbnail_filename, \"r\"))") at /build/buildd/glib2.0-2.13.7/glib/gmessages.c:552
No locals.
#3  0x08049b9c in ?? ()
#4  0x00000000 in ?? ()