Date: Mon, 31 May 2004 23:19:38 +0200 From: "Willem Jan Withagen" <wjw@withagen.nl> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: freebsd-current@freebsd.org Subject: Re: Possible bug in malloc-code Message-ID: <0c1301c44754$fc027160$471b3dd4@dual> References: <2675.1086036694@critter.freebsd.dk>
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> In message <0be501c4474f$bb115400$471b3dd4@dual>, "Willem Jan Withagen"
writes:
> >
> > i = 11
> >Alloc: n = 335544320, ADR = 0x00000000485D7000
> >Alloc: n = 402653184, ADR = 0x000000005C5D7000
> >Alloc: n = 469762048, ADR = 0x00000000745D7000
> >Alloc: n = 536870912, ADR = 0xFFFFFFFF905D7000
> >Free: n = 536870912, ADR = 0xFFFFFFFF905D7000
> >rMemoryDrv in free(): error: junk pointer, too high to make sense
> >Abort (core dumped)
>
> As for this part: Does the program in fact have a prototype for
> malloc(3) in sight ? Can you try to explicitly add a wrong prototype
> to see that it complains ? Alternatively, #include <stdlib.h> to get
> it a prototype.
>
> I looked briefly at the source code of the test-program and while I am
> in a position to say that it is doing something wrong with the casting,
> it does look mightily bogus to me.
Fair question, and to be honest. I assume(d) that it somewhere in its infinite
load of obscurity included stdlib.h
Hold on, I'll check....
Well I'm actually using calloc() since the original writer assumes that malloc
returns zero-ed space.
And looking through the preprocessed output stdlib.h is not included....
And bingo, we have a winner with stdlib.h manually included:
Alloc/Free large not inverse 11
Alloc: n = 402653184, ADR = 0x00000000605E7000
Alloc/Free large not inverse 11
Alloc: n = 402653184, ADR = 0x00000000785E7000
Alloc/Free large not inverse 11
i = 12
Alloc: n = 671088640, ADR = 0x00000000905E7000
Alloc: n = 805306368, ADR = 0x00000000B85E7000
Alloc: n = 939524096, ADR = 0x00000000E85E7000
No more sign-extention trouble
I'm afraid that these kinds of 'bugs' are going to haunt me for the remainder
of porting the tool. :(
Thanx,
--WjW
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