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Full Discussion: Why does this occur? *** glibc detected *** malloc(): memory corruption: 0x10013ff8 ***
Top Forums Programming Why does this occur? *** glibc detected *** malloc(): memory corruption: 0x10013ff8 *** Post 302367056 by achenle on Saturday 31st of October 2009 08:04:51 PM
Old 10-31-2009
Quote:
Originally Posted by cdbug
Add return statement and change return type and it can work.

But it still fails after generating many vertices. Notice where failure occurs

This seems to be a general problem.

Thanks for all your help

____________________________________
Program received signal SIGSEGV, Segmentation fault.
0x0027ff92 in _int_malloc () from /lib/tls/libc.so.6
(gdb) bt
#0 0x0027ff92 in _int_malloc () from /lib/tls/libc.so.6
#1 0x0027f0fd in malloc () from /lib/tls/libc.so.6
#2 0x0804956e in make_vertex (ver=0xbfffb624, index=-1, se=0, ps=2)


Code:
vertex *root;
root = make_vertex(&root, -1, 0, -1);


static vertex* make_vertex(vertex **ver, int index, int s, int ps)
{
        ver = (vertex **)malloc(sizeof(vertex *)); //Here:fails
        if (ver == NULL)
            exit(1);

        *ver = (vertex *)malloc(sizeof(vertex));
        if ( *ver == NULL ) {
            printf("memory allocation error\n");
            exit(1);
        }

        (*ver)->id        = index;
        (*ver)->seq       = s;
        (*ver)->pos       = ps;
        (*ver)->clique    = 0;
        (*ver)->numOfPrev = 0;
        (*ver)->numOfVer  = 0;
        (*ver)->numOfNext = 0;
        (*ver)->prev      = NULL;
        (*ver)->next      = NULL;
        (*ver)->front     = NULL;
        (*ver)->back      = NULL;
        (*ver)->left      = NULL;
        (*ver)->right     = NULL;

    return *ver;
}



---------- Post updated at 12:37 PM ---------- Previous update was at 11:01 AM ----------

Tried to use make_vertex. It can change memory in this way. A new trouble takes place. Allocation really gives unexpected problems.

dataset[4] changes
__________________________________________________________________
110 r = make_vertex(&rho, -1, 0, i);
(gdb) p *(dataset+3)
$33 = 0x8145200 "AATTGTAAC"
(gdb) p *(dataset+4)
$34 = 0x8145a30 "GCTGAATGA"
(gdb) n
111 first = rho;
(gdb) p *(dataset+3)
$35 = 0x8145200 "AATTGTAAC"
(gdb) p *(dataset+4)
$36 = 0xb25a90 "\210Zē"
First, if you're going to overwrite the original contents of the pointer you pass it, why bother passing in its address in the first place?

Code:
static vertex* make_vertex( int index, int s, int ps )
{
    vertex *ver;
    ver = ( vertex * ) calloc( sizeof( vertex ) );
    if ( NULL != ver )
    {
        ver->id = index;
        ver->seq = s;
        ver->pos = ps;
    }
    return( ver );
}

If THAT blows up, your heap is getting corrupted before you even make the call to make_vertex().
 

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LEARN ABOUT SUNOS

elf32_fsize

elf32_fsize(3ELF)					       ELF Library Functions						 elf32_fsize(3ELF)

NAME

       elf32_fsize, elf64_fsize - return the size of an object file type

SYNOPSIS

       cc [ flag ... ] file ... -lelf [ library ... ]
       #include <libelf.h>

       size_t elf32_fsize(Elf_Type type, size_t count, unsigned ver);

       size_t elf64_fsize(Elf_Type type, size_t count, unsigned ver);

DESCRIPTION

       elf32_fsize() gives the size in bytes of the 32-bit file representation of count data objects with the given type. The library uses version
       ver to calculate the size. See elf(3ELF) and elf_version(3ELF).

       Constant values are available for the sizes of fundamental types:

	      Elf_Type	File Size Memory Size
	      ELF_T_ADDR     ELF32_FSZ_ADDR sizeof(Elf32_Addr)
	      ELF_T_BYTE     1	  sizeof(unsigned char)
	      ELF_T_HALF     ELF32_FSZ_HALF sizeof(Elf32_Half)
	      ELT_T_OFF ELF32_FSZ_OFF  sizeof(Elf32_Off)
	      ELF_T_SWORD    ELF32_FSZ_SWORD	 sizeof(Elf32_Sword)
	      ELF_T_WORD     ELF32_FSZ_WORD sizeof(Elf32_Word)

       elf32_fsize() returns 0 if the value of type or ver is unknown. See elf32_xlatetof(3ELF) for a list of the type values.

       For the 64-bit class, replace 32 with 64 as appropriate.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       elf(3ELF), elf32_xlatetof(3ELF), elf_version(3ELF), libelf(3LIB), attributes(5)

SunOS 5.10							    11 Jul 2001 						 elf32_fsize(3ELF)
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