0xb786fb49 in js_GetGCStringRuntime (str=0x8087f78) at jsgc.c:517
517         pi = THING_TO_PAGE(str);
(gdb) bt
#0  0xb786fb49 in js_GetGCStringRuntime (str=0x8087f78) at jsgc.c:517
#1  0xb784506f in JS_GetStringBytes (str=0x8087f78) at jsapi.c:4550
#2  0x08074bb1 in ?? ()