Subj : SIGBUS on Latest CVS checkout of Spidermonkey
To   : netscape.public.mozilla.jseng
From : prohto
Date : Wed Jun 29 2005 10:36 am

Hi everybudy.

I'm using a latest cvs checkout of spidermonkey on a custom
application. In few words, during testing I do an infinite loop,
executing in every loop the same secuence command ans script on a
context. Before staring a new iteration I run JS_GC.
When I compile  the libjs using BUILD_OPT=1, I get a SIGBUS after a few
iteration. I tried the same test but now compiling for DBG, but I
couldn't get the signal. I tried again with BUILD_OPT=1 but now I
manully added the option "-g" at compile time. This time I got the
signal and core was dumped. Using gdb a got the following information:

#0  0xff27c9b0 in MarkGCThing (cx=0x175c90, thing=0x73c90,
    flagp=0x740ea "0  ", '\001' <repeats 19 times>, "   \001
\001\001\001\001\001 \001", ' ' <repeats 41 times>, "\001", ' '
<repeats 28 times>) at jsgc.c:1132
#1  0xff27cb64 in MarkGCThing (cx=0x175c90, thing=0x73c90,
    flagp=0x740ea "0  ", '\001' <repeats 19 times>, "   \001
\001\001\001\001\001 \001", ' ' <repeats 41 times>, "\001", ' '
<repeats 28 times>) at jsgc.c:1223
#2  0xff27d41c in js_MarkGCThing (cx=0x175c90, thing=0x73c90,
arg=0x740ea) at jsgc.c:1438
Current language:  auto; currently c
(gdb) bt full
#0  0xff27c9b0 in MarkGCThing (cx=0x175c90, thing=0x73c90,
    flagp=0x740ea "0  ", '\001' <repeats 19 times>, "   \001
\001\001\001\001\001 \001", ' ' <repeats 41 times>, "\001", ' '
<repeats 28 times>) at jsgc.c:1132
        rt = (JSRuntime *) 0x17e0a8
        obj = (JSObject *) 0x73c90
        v = 1578981
        vp = (jsval *) 0x740ea
        end = (jsval *) 0x38
        str = (JSString *) 0x182e60
        next_thing = (void *) 0x182c40
        next_flagp = (uint8 *) 0x1817a0
"\020\021\022\021\021\021\021\021"
        stackDummy = 374552
#1  0xff27cb64 in MarkGCThing (cx=0x175c90, thing=0x73c90,
    flagp=0x740ea "0  ", '\001' <repeats 19 times>, "   \001
\001\001\001\001\001 \001", ' ' <repeats 41 times>, "\001", ' '
<repeats 28 times>) at jsgc.c:1223
        rt = (JSRuntime *) 0x17e0a8
        obj = (JSObject *) 0x73c90
        v = 1578981
        vp = (jsval *) 0x740ea
        end = (jsval *) 0x38
        str = (JSString *) 0x182e60
        next_thing = (void *) 0x182c40
        next_flagp = (uint8 *) 0x1817a0
"\020\021\022\021\021\021\021\021"
        stackDummy = 374552
#2  0xff27d41c in js_MarkGCThing (cx=0x175c90, thing=0x73c90,
arg=0x740ea) at jsgc.c:1438
        flagp = (uint8 *) 0x17e0a8 ""


I hope somebody could extract some usefull information from this logs.
In the mean time I will try to solve or override the problem.


Best regards


Carlos Fangmeier H.

.