Getting a DatabaseException on startup: (database is locked (code 5 SQLITE_BUSY[5]))

Android でバージョン 3.3.1 を使用して初回ロード時の失敗を再現し、その後 package:flutter_cache_manager/src/storage/cache_info_repositories/cache_object_provider.dart の CacheObjectProvider.open と cache_store.dart の CacheStore._getCacheDataFromDatabase から調査を開始してください。sqflite を通る BEGIN EXCLUSIVE の経路を追跡し、起動中にキャッシュデータベースがロックされる理由を特定してください。初回ロードで、未処理の SQLITE_BUSY 例外なしにキャッシュを開ければ完了です。

🐛 Bug Report

Hi, I'm having a DatabaseException on the application's first load, when it tries to setup the database for the cache. The cache stays unusable for this first load, but the second time the application is opened it can work this out and then it will continue working every time.

This is a logcat output from Android:

09-05 16:18:26.154 19280 19371 I flutter : error DatabaseException(database is locked (code 5 SQLITE_BUSY[5])) sql 'BEGIN EXCLUSIVE' args [] during open, closing...
09-05 16:18:26.165 19280 19371 E flutter : [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: DatabaseException(database is locked (code 5 SQLITE_BUSY[5])) sql 'BEGIN EXCLUSIVE' args []
09-05 16:18:26.165 19280 19371 E flutter : #0      wrapDatabaseException (package:sqflite/src/exception_impl.dart:11)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #1      SqfliteDatabaseMixin.txnSynchronized (package:sqflite_common/src/database_mixin.dart:465)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #2      SqfliteDatabaseMixinExt.txnBeginTransaction (package:sqflite_common/src/database_mixin.dart:353)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #3      SqfliteDatabaseMixin.beginTransaction (package:sqflite_common/src/database_mixin.dart:719)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #4      SqfliteDatabaseMixinExt._txnTransaction (package:sqflite_common/src/database_mixin.dart:330)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #5      BasicLock.synchronized (package:synchronized/src/basic_lock.dart:33)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #6      SqfliteDatabaseMixin.txnSynchronized (package:sqflite_common/src/database_mixin.dart:490)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #7      SqfliteDatabaseMixin.doOpen (package:sqflite_common/src/database_mixin.dart:939)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #8      SqfliteDatabaseOpenHelper.openDatabase (package:sqflite_common/src/database.dart:46)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #9      SqfliteDatabaseFactoryMixin.openDatabase.<anonymous closure> (package:sqflite_common/src/factory_mixin.dart:110)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #10     ReentrantLock.synchronized.<anonymous closure> (package:synchronized/src/reentrant_lock.dart:37)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #11     BasicLock.synchronized (package:synchronized/src/basic_lock.dart:33)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #12     CacheObjectProvider.open (package:flutter_cache_manager/src/storage/cache_info_repositories/cache_object_provider.dart:30)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>
09-05 16:18:26.165 19280 19371 E flutter : #13     CacheStore._getCacheDataFromDatabase (package:flutter_cache_manager/src/cache_store.dart:112)
09-05 16:18:26.165 19280 19371 E flutter : <asynchronous suspension>

At the moment I only tried this on Android, and I'm using version 3.3.1.

My first guess is that some other library may be using Sqlite at the same time, or some other thing like that, but anyways that doesn't seems to be a good reason to crash. Is this issue known?

Thank you