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POAssertion failure :: malloc
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copied!<p>I am running code in a coding site and got following error:</p> <p>solution: malloc.c:2369: sysmalloc: Assertion `(old_top == (((mbinptr) (((char *) &((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd)))) && old_size == 0) || ((unsigned long) (old_size) >= (unsigned long)((((__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 * (sizeof(size_t))) - 1)) & ~((2 * (sizeof(size_t))) - 1))) && ((old_top)->size & 0x1) && ((unsigned long)old_end & pagemask) == 0)' failed. Aborted (core dumped)</p> <p>Code:</p> <pre><code>#include <stdio.h> #include <string.h> #include <math.h> typedef struct cell { int x; int y; struct cell *prevcell; struct cell *nextcell; }cell; /* Head ends here */ void nextMove(int x, int y, int pacman_x, int pacman_y, int food_x, int food_y, char grid[x][y]){ //logic here int i=pacman_x; int j=pacman_y; cell *top,*node; top = NULL; while(grid[i][j] != '.') { node = NULL; //UP if(i != 0 && grid[i-1][j] != '%') { if(grid[i][j] != 'd') { printf("%d %d\n",i,j); grid[i][j]='d'; } //push node = (cell*)malloc(sizeof(node)); node->x=i; node->y=j; node->prevcell=top; node->nextcell=NULL; if(top != NULL) top->nextcell=node; top=node; i=i-1; } //LEFT else if(j != 0 && grid[i][j-1] != '%') { if(grid[i][j] != 'd') { printf("%d %d\n",i,j); grid[i][j]='d'; } //push node = (cell*)malloc(sizeof(node)); node->x=i; node->y=j; node->prevcell=top; node->nextcell=NULL; if(top != NULL) top->nextcell=node; top=node; j=j-1; } //RIGHT else if(j != y-1 && grid[i][j+1] != '%') { if(grid[i][j] != 'd') { printf("%d %d\n",i,j); grid[i][j]='d'; } //push node = (cell*)malloc(sizeof(node)); node->x=i; node->y=j; node->prevcell=top; node->nextcell=NULL; if(top != NULL) top->nextcell=node; top=node; j=j+1; } //DOWN else if(i != x-1 && grid[i+1][j] != '%') { if(grid[i][j] != 'd') { printf("%d %d\n",i,j); grid[i][j]='d'; } //push node = (cell*)malloc(sizeof(node)); node->x=i; node->y=j; node->prevcell=top; node->nextcell=NULL; if(top != NULL) top->nextcell=node; top=node; i=i+1; } else { //pop top=top->prevcell; free(top->nextcell); i=top->x; j=top->y; } } } /* Tail starts here */ int main() { int x, y; int pacman_x, pacman_y; int food_x, food_y; scanf( "%d %d", &pacman_x, &pacman_y); scanf( "%d %d", &food_x, &food_y); scanf( "%d %d", &x, &y); char grid[x][y]; for( int i=0; i<x; i++) { scanf("%s[^\\n]%*c", grid[i]); } nextMove( x, y, pacman_x, pacman_y, food_x, food_y, grid); return 0; } </code></pre> <p>I am not getting the issue. Could someone help??</p>

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