branch-4.0: [fix](core)be core when BeConfDataDirReader::get_data_dir_by_file_path #59204 #59472
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#59204) During the execution of `init_file_cache_factory`, the following call path is triggered: ```txt init_file_cache_factory -> FileCacheFactory::create_file_cache -> cache->initialize() -> initialize_unlocked -> _storage->init(this) -> FSFileCacheStorage::init() ``` (At this point, a thread named `_cache_background_load_thread` is created, and the remaining operations run within this thread) `-> upgrade_cache_dir_if_necessary -> read_file_cache_version -> FileSystem::open_file -> open_file_impl -> LocalFileReader::LocalFileReader -> BeConfDataDirReader::get_data_dir_by_file_path` After `FSFileCacheStorage::init` completes (spawning the `_cache_background_load_thread`), `ExecEnv::_init` continues to execute `doris::io::BeConfDataDirReader::init_be_conf_data_dir`. This function performs push operations on `be_config_data_dir_list`. Simultaneously, `BeConfDataDirReader::get_data_dir_by_file_path` (running in the background thread) iterates over this same `be_config_data_dir_list`. This leads to a race condition: if `doris::io::BeConfDataDirReader::init_be_conf_data_dir` is inserting data while the vector is being read, two issues arise: 1. Modifying `be_config_data_dir_list` while iterating over it via a range-based for loop results in **Undefined Behavior (UB)**. 2. If `be_config_data_dir_list` triggers a reallocation (expansion) during the insertion, concurrent read operations on its elements will access dangling references, triggering a **heap-use-after-free** error. Since `init_be_conf_data_dir` depends on `cache_paths` derived from `init_file_cache_factory`, we must carefully manage the synchronization sequence to prevent these errors.
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yiguolei
approved these changes
Dec 30, 2025
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Cherry-picked from #59204