std::getline()导致segmention fault的奇怪问题.

首先说一下程序逻辑:
程序是提交到hadoop的streaming跑的c++程序.所以需要从stdin读取数据进行处理.而且每一次循环读入的数据都很大可能一行要达到5Mb左右的数据量.
现象是,
当处理少量数据时,程序可以正常结束,但是当处理大量数据时,hadoop报错,subprocess faild with code :11
也就是程序收到signal 11, 最终程序会产生segmention fault错误.
我加-g参数编译(gcc编译器),生成带符号的版本,等seg fault后,gdb -c加载dump文件,然后看堆栈调用,显示全部都是类似如下形式:
0xXXXXXXXX in ?? ()
看样子是调用到什么库里崩的.
然后我将程序逐行打log,发现是崩溃在getline这个c++的库函数调用里.非常不解是怎么回事,哪位高手能解答一下.

下面是程序的部分代码:

int main(int argc, char** argv){

    Json::Reader json;

    static csh handle;

    cs_err cerr;

    cerr = cs_open(CS_ARCH_X86, CS_MODE_32, &handle);

    while(true){

        std::string line; 

        printf("begin ... \n");

        if(std::getline(std::cin, line)){

            printf("parsing string ....\n");

            size_t pos = line.find_last_of("\t");

            printf("first find done ...\n");

            if(pos != std::string::npos && line.find("file_content") != std::string::npos){

                Json::Value output, json_data;

                if(json.parse(line.substr(pos), json_data)){

                    pos = line.find_first_of("\t");

                    output["md5"] = line.substr(0, pos);

                    printf("json parse end ...\n");

                    std::string zip_buffer = base64_decode(json_data["file_content"].asString());

                    size_t file_buf_len = 0;

                    void* file_buf = (void*)unzip(zip_buffer.c_str(), zip_buffer.length(), (size_t*)&file_buf_len);

                    zip_buffer.clear();

                    printf("unzip end ... \n");

                    if(file_buf_len >= sizeof(IMAGE_DOS_HEADER)){

                        //check "MZ" signature

                        printf("checking MZ header ... \n");

                        if(*(unsigned short int*)(file_buf) == 0x5a4d){

                            PIMAGE_DOS_HEADER dos_header = (PIMAGE_DOS_HEADER)file_buf;

                            //check "PE" signature

                            printf("checking PE header ... \n");

                            if(file_buf_len >= (dos_header->e_lfanew + sizeof(IMAGE_NT_HEADERS32)) && *(unsigned int*)((char*)file_buf + dos_header->e_lfanew) == 0x4550){

                                PIMAGE_NT_HEADERS32 nt_header = (PIMAGE_NT_HEADERS32)((char*)file_buf + dos_header->e_lfanew);

                                printf("getting section ... \n");

                                PIMAGE_SECTION_HEADER psh = get_section_header(file_buf, file_buf_len, nt_header->OptionalHeader.AddressOfEntryPoint);

                                printf("border check ... \n");

                                if(psh && file_buf_len >= psh->PointerToRawData + psh->SizeOfRawData){

                                    cs_insn* insn;

                                    unsigned int address = nt_header->OptionalHeader.AddressOfEntryPoint + nt_header->OptionalHeader.ImageBase;

                                    size_t count = cs_disasm(handle, \

                                            (uint8_t*)((char*)file_buf+RVA2OFFSET(nt_header->OptionalHeader.AddressOfEntryPoint,psh)), \

                                            psh->PointerToRawData + psh->SizeOfRawData, \

                                            address, 0, &insn);

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

                                        char szIns[520] = {0};

                                        sprintf(szIns, "0x%x\t%s\t%s\n", insn[i].address, insn[i].mnemonic, insn[i].op_str);

                                        output["asm"].append(szIns);

                                    }

                                    cs_free(insn, count);

                                    std::cout<<output["md5"].asString()<<std::endl;

                                }

                            }

                        }

                    }

                    std::cout<<"free buffer ... "<<std::endl;

                    if(file_buf) free(file_buf);

                }

            }

            std::cout<<"-------------------------------"<<std::endl;

            line.resize(0);

        }

    }

    return 0;

}

下面是崩溃时的log:

begin ... 

parsing string ....

first find done ...

json parse end ...

unzip end ... 

checking MZ header ... 

checking PE header ... 

getting section ... 

border check ... 

318e619313393266d4036b42815b5646

free buffer ... 

-------------------------------

begin ... 

parsing string ....

first find done ...

json parse end ...

unzip end ... 

checking MZ header ... 

checking PE header ... 

getting section ... 

border check ... 

860582da12e4205474eb8a0fb49e556b

free buffer ... 

-------------------------------

begin ... 



[1]+  段错误               nohup cat /data/sample.bin | ./asm > log.log 2>&1