alternatively, duplicate of facing error — glibc detected free invalid next size (fast).
i have struct called bond defined follows:
typedef struct{ int type1; int type2; int id_1; int id_2; float dist; } bond; i allocating array of these structs in nested loop , freeing periodically. however, reason getting free() invalid next size error. code below:
while(i<(c.num_type_a+c.num_type_b)){//1a bond_arr=(bond*)malloc(100*sizeof(bond)); a=-n1; while(a<=n1){//2a b=-n2; while(b<=n2){//3a c=-n3; while(c<=n3){//4a j=0; while(j<(c.num_type_a+c.num_type_b)){//5a //if same atom nothing if((i==j)&&(a==0)&&(b==0)&&(c==0)){//6a j=j+1; }//6b else{//7a //calculate bond length bondlength=calc_dist(a,b,c,i,j,c); if(bondlength<=cutoff){//8a //store bond temp_bond.type1=((i+1)<=c.num_type_a); temp_bond.type2=((j+1)<=c.num_type_b); temp_bond.id_1=i; temp_bond.id_2=j; temp_bond.dist=bondlength; bond_arr[n]=temp_bond; n=n+1; //if out of memory allocate twice if(n==(nmax-1)){//9a printf("begin\n"); temp_ptr=realloc(bond_arr,sizeof(bond)*2*nmax); printf("end\n"); if(temp_ptr==null){ printf("memory allocation failed\n"); } else{ bond_arr=temp_ptr; } nmax=2*nmax; }//9b }//8b }//7b j=j+1; }//5b c=c+1; }//4b b=b+1; }//3b a=a+1; }//2b //sort bonds , update li index sort_bonds(bond_arr,n); f=update_li(bond_arr,licurr,n); licurr=f; printf("%d\n",n); free(bond_arr); n=0; i=i+1; }//1b
it looks realloc logic might blame. initial allocation of size 100. grown when n reaches nmax-1. initial value of nmax not shown (that see). if starts @ 100, not reset @ top of loop. if n ever grows past 100 , causes realloc, nmax doubled , no longer match original size of 100.
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