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好吧，正如你告诉我的，我已经创建了一个最小的可重复的例子，问题仍然存在。

#include <stdlib.h>
#include <stdio.h>

struct Map {
    FILE *ptrToMapFile;
    char *mapChars; // This will be a pointer to a malloc
};

struct Map *initializeMap() {
    struct Map *m = malloc( sizeof( *m ) );
    if ( m == NULL ) {
        printf("Error while creating malloc\n");
        exit(1);
    }

    m->ptrToMapFile = fopen("myFile.txt", "r+");
    if ( m->ptrToMapFile == NULL ) {
        printf("Error while opening file\n");
        exit(1);
    }

    // Saving all the characters of my file in malloc
    // Let's say the file contains exactly 10 chars (counting EOF)
    m->mapChars = malloc( 10 );
    char ch;
    size_t i;
    for ( i = 0; (ch = (char)fgetc(m->ptrToMapFile)) != EOF; i++ ) {
        m->mapChars[i] = ch;
    }
    m->mapChars[i] = '\0';

    return m;
}

int main( void ) {

    for ( size_t i = 0; i < 100; i++ ) {

        struct Map *map = initializeMap();

        printf("%d %s\n\n", i, map->mapChars);

        // Close and free memory
        if ( fclose( map->ptrToMapFile ) == 1 ) {
            printf("Error while closing file\n");
            exit(1);
        }
        free( map->mapChars );
        free( map );

    }

    return 0;
}

myFile.txt只包含这9个字母：第一个月
现在，如果你尝试运行代码，你会发现，经过一些迭代程序将崩溃，但如果你删除代码的free( map->mapChars );行程序将成功运行留下未释放的内存tho.那么我如何才能正确释放mapChars？