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Why does this occur? *** glibc detected *** malloc(): memory corruption: 0x10013ff8 ***

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Top Forums Programming Why does this occur? *** glibc detected *** malloc(): memory corruption: 0x10013ff8 ***
# 1  
Old 10-30-2009
Why does this occur? *** glibc detected *** malloc(): memory corruption: 0x10013ff8 ***
there seems not to be error in this segment. In some computers, it can work well. But in others, it will give a failure.

why it ocurrs and how to deal with it?


in a function:
Code:
        if( *ver == NULL ) {
                *ver = (vertex *) malloc(sizeof(vertex));    //this line
                if( *ver == NULL ) {
                        printf("memory allocation error\n");
                }
        }

Last edited by pludi; 10-30-2009 at 09:15 AM.. Reason: code tags, please
# 2  
Old 10-30-2009
Quote:
Originally Posted by cdbug
there seems not to be error in this segment. In some computers, it can work well. But in others, it will give a failure.

why it ocurrs and how to deal with it?


in a function:
Code:
        if( *ver == NULL ) {
                *ver = (vertex *) malloc(sizeof(vertex));    //this line
                if( *ver == NULL ) {
                        printf("memory allocation error\n");
                }
        }



//tabs can not work
Hi. Is this better ?

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

Last edited by vbe; 10-30-2009 at 11:02 AM.. Reason: added code tags in quote...
# 3  
Old 10-30-2009
does not make effect. should generate many vertices for a graph. but it will fail after 20 vertices.

can generate 20 vertices. after then, it fails. can't figure out.
# 4  
Old 10-30-2009
Can you post more of your code including the typedef of vertex...and on which platforms does it fail.
# 5  
Old 10-30-2009
Linux 3.2.3-59

Code:
struct  vertex {
        int id;
        int seq;
        int pos;
        int clique;
        int numOfVer;
        int numOfPrev;
        int numOfNext;
        int *prev;
        int *next;
        vertex *front;
        vertex *back;
        vertex *left;
        vertex *right;
};

static void make_vertex(vertex **ver, int index, int s, int ps) {
       
        *ver = NULL;
        if( *ver == NULL ) {
                *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;
}

Regards
Last edited by cdbug; 10-30-2009 at 12:55 PM..
# 6  
Old 10-30-2009
Quote:
Originally Posted by cdbug
Linux 3.2.3-59

Code:
struct  vertex {
        int id;
        int seq;
        int pos;
        int clique;
        int numOfVer;
        int numOfPrev;
        int numOfNext;
        int *prev;
        int *next;
        vertex *front;
        vertex *back;
        vertex *left;
        vertex *right;
};

static void make_vertex(vertex **ver, int index, int s, int ps) {
       
        *ver = NULL;
        if( *ver == NULL ) {
                *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;
}

Regards
Allocate storage for ver before mallocing memory for *ver as ver maybe pointing to some arbitrary location producing the malloc corruption.
# 7  
Old 10-30-2009
where and how should this be done? Would you please give an example?

Thanks
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