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如何解决mpi C

我用 C 语言用 MPI 编写了这个程序。问题是在特定的点上程序崩溃了，我不明白为什么，因为我只增加了一个变量。

 for(int tmp=0;tmp<sizeof(how_much_word)/sizeof(how_much_word[0])-1;tmp++){
                cum_sum += how_much_word[tmp];
                printf("Cumulative sum: %d \n",cum_sum);
                printf("AFTER CUM SUM");
                if(cum_sum > lowerbound && partition > 0 ){
                    strcpy(path,"/myfolder");
                    strcat(path,file_name_and_number_words[tmp]);
                    printf("name of file: %s \n",path);
                    file = fopen(path,"r");
                    printf("opening the file: %s \n",file_name_and_number_words[tmp]);
                    start = how_much_word[tmp] - (cum_sum-lowerbound);
        
                    if (start < 0){
                        start = 0;
                    }

                    printf("Start reading: %d \n",cum_sum);

                    while((ch = fgetc(file)) != EOF){
                        if(isalnum(ch)!=0 ){
                            in_word =1;

                        } else{
                            if ((ch == ' ' || ch == '\t' || ch== '\n') && (in_word==1)){
                                word_count++;
                                in_word=0;
                                if(word_count >= start){
                                    partition--;
                                }
                            }/*end if tabulazione*/
                        } /*end else*/
                    } /*end while*/
                    printf("While is over with partiton: %d",partition);
                    
                } /*end if*/
                fclose(file);
            }/*end for*/

数组有 2 个元素，file_name_and_number_words 有 "mytxt.txt" 和 "mytxt2.txt"，数组 how_much_word 有这些文件的字数，所以在这种情况下是 6 和 18。程序在 printf“AFTER CUM SUM”之前崩溃，但我不明白出了什么问题。崩溃的输出是：

Cumulative sum: 6 
[979208abf4bc:26041] *** Process received signal ***
[979208abf4bc:26041] Signal: Segmentation fault (11)
[979208abf4bc:26041] Signal code: Address not mapped (1)
[979208abf4bc:26041] Failing at address: (nil)
[979208abf4bc:26041] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20)[0x7f49630daf20]
[979208abf4bc:26041] [ 1] /lib/x86_64-linux-gnu/libc.so.6(fclose+0x4)[0x7f496311a254]
[979208abf4bc:26041] [ 2] Compiled/partitioningtest.out(+0x1950)[0x555784fc1950]
[979208abf4bc:26041] [ 3] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f49630bdb97]
[979208abf4bc:26041] [ 4] Compiled/partitioningtest.out(+0xcca)[0x555784fc0cca]
[979208abf4bc:26041] *** End of error message ***

文件路径有问题（我无法验证，因为在cumsum增量后我无法做任何事情）？变量路径在 main 中声明（在等级为 0 的进程之外）。声明是字符路径[2100]。我也在master内部使用了这个变量，但我认为这不是问题，因为每个进程应该有不同的内存区域。

已编辑：数组已由秩为 0 的进程发送并以这种方式接收 MPI_Recv(how_much_word,sizeof(how_much_word)/sizeof(how_much_word[0]),MPI_INT,1,MPI_COMM_WORLD,&status);