Re: [Gaul-devel] glibc detected *** double free or corruption (!prev) for integer Differential Evolution

[Gangadhar N. <npk...@gm...>]

Stewart,
I also don't have access to the code right now to be certain as to
what is the problem, but the question from the stack trace I have is
- why should the datatype of whatever is being deleted be instrumental
in a coredump. From the stack it looks like it is a double delete. So,
is it a case of a border condition being hit when the data became
float. Just a thought.

Thank you
Gangadhar
On 3/2/08, Stewart Adcock <ste...@gm...> wrote:
> Hi Nick,
>
>  I don't have access to the source to check, but I am pretty sure that
>  the differential evolution algorithm requires chromosomes with
>  continuous rather than discrete values.  Therefore, it does not
>  support integers; it probably only supports doubles as currently
>  implemented.
>
>  This should be documented somewhere, but it most likely not.  So,
>  sorry about that,
>
>  Regards,
>  Stewart.
>
>  2008/2/26 Nick Hall <dar...@gm...>:
>  > Hello,
>  >
>  > I recently started using GAUL and I like it so far, however, I've run into a
>  > problem.
>  >
>  > If I compile and run the polynomial_de example it works just fine, however,
>  > I changed the chromosomes, which were doubles, to ints, and also changed the
>  > call to ga_genesis_double to ga_genesis_int to account for the change in
>  > data type.
>  >
>  > Now when I run the program it crashes with the output:
>  >
>  > Strategy DE/best/1/exp (DE0) ; C = 0.800000 ; F = 0.500000
>  > 0: A = 1 B = 1 C = 1 D = 1 (fitness = -0.716106)
>  > *** glibc detected *** double free or corruption (!prev): 0x0000000000503d70
>  > ***
>  >  Aborted (core dumped)
>  >
>  > I ran valgrind on the program and got the following output:
>  >
>  > Strategy DE/best/1/exp (DE0) ; C = 0.800000 ; F = 0.500000
>  > ==3256== Conditional jump or move depends on uninitialised value(s)
>  >  ==3256==    at 0x36DA011C46:
>  > ga_population_set_differentialevolution_parameters (in
>  > /usr/lib64/libgaul.so.0.0.49)
>  > ==3256==    by 0x400C99: main (polynomial_de.c:231)
>  > 0: A = 1 B = 1 C = 1 D = 1 (fitness = -0.716106)
>  >  ==3256==
>  > ==3256== Invalid read of size 8
>  > ==3256==    at 0x36DA012C13: ga_differentialevolution (in
>  > /usr/lib64/libgaul.so.0.0.49)
>  > ==3256==    by 0x400CA6: main (polynomial_de.c:237)
>  > ==3256==  Address 0x4A31C60 is 8 bytes after a block of size 16 alloc'd
>  >  ==3256==    at 0x4904A06: malloc (vg_replace_malloc.c:149)
>  > ==3256==    by 0x36D9E09693: s_malloc_safe (in
>  > /usr/lib64/libgaul_util.so.0.0.49)
>  > ==3256==    by 0x36DA009712: ga_chromosome_integer_allocate (in
>  > /usr/lib64/libgaul.so.0.0.49)
>  >  ==3256==    by 0x36DA00DEAB: ga_get_free_entity (in
>  > /usr/lib64/libgaul.so.0.0.49)
>  > ==3256==    by 0x36DA00E067: gaul_population_fill (in
>  > /usr/lib64/libgaul.so.0.0.49)
>  > ==3256==    by 0x36DA01219E: ga_differentialevolution (in
>  > /usr/lib64/libgaul.so.0.0.49)
>  >  ==3256==    by 0x400CA6: main (polynomial_de.c:237)
>  > etc......
>  >
>  > Just for comparison, I tried running valgrind on the original program (with
>  > doubles) and it did not detect any memory problems.
>  >
>  > I am running GAUL 0.1849-0, CentOS 4.6, Linux kernel 2.6.9-67.0.4, GCC
>  > version 3.4.6.
>  >
>  > I also wrote my own program using ints and differential evolution and have
>  > the same issue. Does anyone know what could be causing this problem with
>  > ints? Thanks,
>  >
>  > Nick
>  >
>  >
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