QList iterator will cause crash

void ProjectInfos::getFilesInfos(const QString &path){   
    QDir dir(path);   
    auto files = dir.entryInfoList(QDir::NoDotAndDotDot|QDir::Files |QDir::Dirs);   
    auto it = files.begin();   
    QFile record(getTmpPath()+"/"+dir.dirName()+".csv");    if(!record.open(QIODevice::WriteOnly))   
    {        return ;    }   
    QTextStream out(&record);   
    int i = 0;   
    while (i<files.size())
    {        qDebug()<<" file count "<<files.size()  << " index "<<i;      
        //auto info  = files.at(i);       
        auto info  = *it;      
        out<< info.fileName() <<","<<info.size()<<Qt::endl;       
        qDebug()<<info.fileName() ;       
        bool isFile = info.isFile();        
        if(isFile)      
        {            ++it;        
            ++i;           
            continue;     
        }    
        QDir subDir(info.absoluteFilePath());    
        auto subFiles = subDir.entryInfoList(QDir::NoDotAndDotDot|QDir::Files |QDir::Dirs);        //files+=subFiles;       
        for(auto info : subFiles)      
        {           
            files.push_back(info);     
        }     
        qDebug()<<" add files "<<subFiles.size();        ++it;        ++i;    }   
    out.flush();
}}

//代码占位符
void ProjectInfos::getFilesInfos(const QString &path)
{   
    QDir dir(path);  
    auto files = dir.entryInfoList(QDir::NoDotAndDotDot|QDir::Files |QDir::Dirs).toStdList();   
    auto it = files.begin();   
    QFile record(getTmpPath()+"/"+dir.dirName()+".csv");    if(!record.open(QIODevice::WriteOnly))   
    {       
        return ;   
    }   
    QTextStream out(&record);   
    int i = 0;    
    while (i<files.size()) 
    {       
        qDebug()<<" file count "<<files.size()  << " index "<<i;     
        //auto info  = files.at(i);       
        auto info  = *it;      
        out<< info.fileName() <<","<<info.size()<<Qt::endl;      
        qDebug()<<info.fileName() ;       
        bool isFile = info.isFile();      
        if(isFile)      
        {            ++it;  
            ++i;          
            continue;       
        }         QDir subDir(info.absoluteFilePath());   
        auto subFiles = subDir.entryInfoList(QDir::NoDotAndDotDot|QDir::Files |QDir::Dirs).toStdList();       
        //files+=subFiles;        
        
        for(auto info : subFiles)       
        {           
            files.push_back(info);     
        }        
        qDebug()<<" add files "<<subFiles.size();      
        ++it;      
        ++i;   
    }   
    out.flush();
}