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我知道 asprintf() 分配内存，这需要在调用后释放。我为提供给 asprintf 的指针添加了免费语句（在使用它们之后），但 valgrind 报告我仍然有内存泄漏：

==2697== HEAP SUMMARY:
==2697==     in use at exit: 0 bytes in 12 blocks
==2697==   total heap usage: 401 allocs, 389 frees, 15,015 bytes allocated
==2697== 
==2697== 0 bytes in 6 blocks are definitely lost in loss record 1 of 2
==2697==    at 0x4C2DB2F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2697==    by 0x1094BB: experiment (hw2pt2.c:235)
==2697==    by 0x4E416C9: start_thread (pthread_create.c:333)
==2697== 
==2697== 0 bytes in 6 blocks are definitely lost in loss record 2 of 2
==2697==    at 0x4C2DB2F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==2697==    by 0x1094CC: experiment (hw2pt2.c:236)
==2697==    by 0x4E416C9: start_thread (pthread_create.c:333)
==2697== 
==2697== LEAK SUMMARY:
==2697==    definitely lost: 0 bytes in 12 blocks
==2697==    indirectly lost: 0 bytes in 0 blocks
==2697==      possibly lost: 0 bytes in 0 blocks
==2697==    still reachable: 0 bytes in 0 blocks
==2697==         suppressed: 0 bytes in 0 blocks

...所以现在所有字节都被释放了，但我仍然分配了块？我该如何解决。这也是发生这种情况的代码部分（包括 hw2pt2.c:235 和 236，它们是 asprintf 行）。

char *results = (char *)malloc(0);
  for (int i = 0; i < NUM_THREADS; i++) {
    char *str1 = (char *)malloc(0);
    char *str2 = (char *)malloc(0);
    asprintf(&str1, "\tProducer Thread %d slept %d times\n", i, r_vals[i]);
    asprintf(&str2, "\tConsumer Thread %d slept %d times\n", i, r_vals[i+2]);
    int len = strlen(str1)+strlen(str2)+strlen(results);
    results = (char *)realloc(results, len*sizeof(char));
    strcat(results, str1);
    strcat(results, str2);
    free(str1);
    free(str2);
  }

PS - “*results”稍后在程序中被释放

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