c - 两种不同的内存错误取决于我分配内存的位置

Question

对于我的 C 程序，我尝试为双数组(ssi)分配内存，然后在另一个函数(spslicer)中访问它。如果我在调用另一个应该不相关的函数(kpmdos)之前分配此内存，我会收到错误:

*** glibc 检测到 *** ./SpecSli.ex:双重释放或损坏 (!prev):0x0000000000a86e40 ***

如果我在收到错误后分配它:

malloc.c:3830: _int_malloc: 断言“(unsigned long)(size) >= (unsigned long)(nb)”失败。

基于此，我认为分配内存时我在 kpmdos 中做错了什么，但我看不到任何错误:

void kpmdos(csptr A, int Mdeg, double nvec, double ctr, double wid, int n, double *mu){

  // initialize variables
  double *w = malloc(n*sizeof(double));
  //free(w);
  fill_rand(n, w);
  double *v = malloc(n*sizeof(double));
  divide_array(w, norm(w, n), v, n);

  double *vkm1 = malloc(n*sizeof(double)); 
  fill(n, 0, vkm1);
  double *vk = malloc(n*sizeof(double));
  memcpy(vk,v, n*sizeof(double));
  double *temp = malloc(n*sizeof(double));
  double *vkp1 = malloc(n*sizeof(double));
  double thet = pi/(Mdeg+1);
  double a1 = 1/(Mdeg+2.0);
  double a2 = sin(thet);
  double jac;
  double scal;

然后我在不分配内存的情况下进行一些其他编码。

  free(w);
  free(vkp1);
  free(vkm1);
  free(temp);
  free(vk);
  free(v);
}

当 valgrind 在函数之前分配时，使用它的输出是:

> > ==7045== HEAP SUMMARY:
> ==7045==     in use at exit: 46,452 bytes in 235 blocks
> ==7045==   total heap usage: 351 allocs, 116 frees, 66,700 bytes allocated
> ==7045== 
> ==7045== LEAK SUMMARY:
> ==7045==    definitely lost: 22,331 bytes in 146 blocks
> ==7045==    indirectly lost: 0 bytes in 0 blocks
> ==7045==      possibly lost: 0 bytes in 0 blocks
> ==7045==    still reachable: 24,121 bytes in 89 blocks
> ==7045==         suppressed: 0 bytes in 0 blocks
> ==7045== Rerun with --leak-check=full to see details of leaked memory
> ==7045== 
> ==7045== For counts of detected and suppressed errors, rerun with: -v
> ==7045== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)

如果您知道问题所在或需要更多信息，请告诉我。

Answer 1

谢谢大家的帮助。我终于明白了大部分内容。在我没有发布的编码过程中，我有一个函数可以将数组中的所有变量更改为不同的值，并且对于这个函数，我输入了错误的数组大小。