Doctrine\DBAL\Exception\UniqueConstraintViolationException: An exception occurred while executing 'INSERT INTO `oc_file_locks`

[tapete]

### Steps to reproduce 1. Fresh install nextcloud 13.0.0 2. Install Desktop client 2.3.3 to desktop A 2. Sync Data From desktop A to nextcloud 3. Install Desktop client 2.3.3 to desktop B 4. Sync Data from nextcloud to desktop B ### Expected behaviour Desktop A and desktop B should be synced. ### Actual behaviour Server Error in step 4. ### Server configuration **Operating system**: Ubuntu 16.04.3 **Web server:** apache 2.4.18 **Database:** MySQL 5.7.21 **PHP version:** 7.0.22 **Nextcloud version:** (see Nextcloud admin page) 13.0.0 **Updated from an older Nextcloud/ownCloud or fresh install:** fresh install **Where did you install Nextcloud from:** downloaded zip file from nextcloud.com **Signing status:**

Signing status

No errors have been found.

**List of activated apps:**

App list

Enabled: - activity: 2.6.1 - audioplayer: 2.2.5 - calendar: 1.6.1 - comments: 1.3.0 - contacts: 2.1.2 - dav: 1.4.6 - federatedfilesharing: 1.3.1 - federation: 1.3.0 - files: 1.8.0 - files_pdfviewer: 1.2.0 - files_sharing: 1.5.0 - files_texteditor: 2.5.1 - files_trashbin: 1.3.0 - files_versions: 1.6.0 - files_videoplayer: 1.2.0 - firstrunwizard: 2.2.1 - gallery: 18.0.0 - logreader: 2.0.0 - lookup_server_connector: 1.1.0 - nextcloud_announcements: 1.2.0 - notifications: 2.1.2 - oauth2: 1.1.0 - password_policy: 1.3.0 - provisioning_api: 1.3.0 - radio: 0.6.1 - serverinfo: 1.3.0 - sharebymail: 1.3.0 - survey_client: 1.1.0 - systemtags: 1.3.0 - theming: 1.4.1 - twofactor_backupcodes: 1.2.3 - updatenotification: 1.3.0 - workflowengine: 1.3.0 Disabled: - admin_audit - encryption - files_external - user_external - user_ldap

**Nextcloud configuration:**

Config report

{ "system": { "instanceid": "***REMOVED SENSITIVE VALUE***", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "secret": "***REMOVED SENSITIVE VALUE***", "trusted_domains": [ "REMOVED" ], "datadirectory": "***REMOVED SENSITIVE VALUE***", "overwrite.cli.url": "https:REMOVED", "dbtype": "mysql", "version": "13.0.0.14", "dbname": "***REMOVED SENSITIVE VALUE***", "dbhost": "***REMOVED SENSITIVE VALUE***", "dbport": "", "dbtableprefix": "oc_", "mysql.utf8mb4": true, "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "installed": true } }

**Are you using external storage, if yes which one:** local/smb/sftp/... no **Are you using encryption:** yes/no no **Are you using an external user-backend, if yes which one:** LDAP/ActiveDirectory/Webdav/... no ### Client configuration **Browser:** not used **Operating system:** Windows 8 ### Logs #### Web server error log

Web server error log

no errors in apache error log

#### Nextcloud log (data/nextcloud.log)

Nextcloud log

``` {"reqId":"IZayWr9u8RlHbPF4jkSz","level":4,"time":"2018-03-14T21:26:23+00:00","remoteAddr":"88.130.91.85","user":"REMOVED","app":"webdav","method":"GET","url":"\/remote.php\/dav\/files\/REMOVED\/Eigene%20Dateien\/Projekte\/Ubuntu%20Server\/REMOVED\/Downloads\/owncloud\/lib\/public\/appframework\/app.php","message":"Exception: {\"Exception\":\"Doctrine\\\\DBAL\\\\Exception\\\\UniqueConstraintViolationException\",\"Message\":\"An exception occurred while executing 'INSERT INTO `oc_file_locks` (`key`,`lock`,`ttl`) SELECT ?,?,? FROM `oc_file_locks` WHERE `key` = ? HAVING COUNT(*) = 0' with params [\\\"files\\\\\\\/588083b9b29a30143825e90a02e060fc\\\", 1, 1521066383, \\\"files\\\\\\\/588083b9b29a30143825e90a02e060fc\\\"]:\\n\\nSQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'files\\\/588083b9b29a30143825e90a02e060fc' for key 'lock_key_index'\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/doctrine\\\/dbal\\\/lib\\\/Doctrine\\\/DBAL\\\/DBALException.php(128): Doctrine\\\\DBAL\\\\Driver\\\\AbstractMySQLDriver->convertException('An exception oc...', Object(Doctrine\\\\DBAL\\\\Driver\\\\PDOException))\\n#1 \\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/doctrine\\\/dbal\\\/lib\\\/Doctrine\\\/DBAL\\\/Connection.php(1015): Doctrine\\\\DBAL\\\\DBALException::driverExceptionDuringQuery(Object(Doctrine\\\\DBAL\\\\Driver\\\\PDOMySql\\\\Driver), Object(Doctrine\\\\DBAL\\\\Driver\\\\PDOException), 'INSERT INTO `oc...', Array)\\n#2 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/DB\\\/Connection.php(216): Doctrine\\\\DBAL\\\\Connection->executeUpdate('INSERT INTO `oc...', Array, Array)\\n#3 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/DB\\\/Adapter.php(114): OC\\\\DB\\\\Connection->executeUpdate('INSERT INTO `oc...', Array)\\n#4 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/DB\\\/Connection.php(254): OC\\\\DB\\\\Adapter->insertIfNotExist('*PREFIX*file_lo...', Array, Array)\\n#5 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Lock\\\/DBLockingProvider.php(119): OC\\\\DB\\\\Connection->insertIfNotExist('*PREFIX*file_lo...', Array, Array)\\n#6 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Lock\\\/DBLockingProvider.php(164): OC\\\\Lock\\\\DBLockingProvider->initLockField('files\\\/588083b9b...', 1)\\n#7 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/Storage\\\/Common.php(709): OC\\\\Lock\\\\DBLockingProvider->acquireLock('files\\\/588083b9b...', 1)\\n#8 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(592): OC\\\\Files\\\\Storage\\\\Common->acquireLock('files\\\/Eigene Da...', 1, Object(OC\\\\Lock\\\\DBLockingProvider))\\n#9 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(592): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/Eigene Da...', 1, Object(OC\\\\Lock\\\\DBLockingProvider))\\n#10 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/View.php(1926): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/Eigene Da...', 1, Object(OC\\\\Lock\\\\DBLockingProvider))\\n#11 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/View.php(2040): OC\\\\Files\\\\View->lockPath('\\\/Eigene Dateien...', 1)\\n#12 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/View.php(1134): OC\\\\Files\\\\View->lockFile('\\\/Eigene Dateien...', 1)\\n#13 \\\/var\\\/www\\\/html\\\/ssl443\\\/lib\\\/private\\\/Files\\\/View.php(987): OC\\\\Files\\\\View->basicOperation('fopen', '\\\/Eigene Dateien...', Array, 'r')\\n#14 \\\/var\\\/www\\\/html\\\/ssl443\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/File.php(337): OC\\\\Files\\\\View->fopen('Eigene Dateien\\\/...', 'r')\\n#15 \\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(85): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\File->get()\\n#16 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpGet(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#17 \\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#18 \\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:GET', Array)\\n#19 \\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#20 \\\/var\\\/www\\\/html\\\/ssl443\\\/apps\\\/dav\\\/lib\\\/Server.php(283): Sabre\\\\DAV\\\\Server->exec()\\n#21 \\\/var\\\/www\\\/html\\\/ssl443\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(35): OCA\\\\DAV\\\\Server->exec()\\n#22 \\\/var\\\/www\\\/html\\\/ssl443\\\/remote.php(164): require_once('\\\/var\\\/www\\\/html\\\/s...')\\n#23 {main}\",\"File\":\"\\\/var\\\/www\\\/html\\\/ssl443\\\/3rdparty\\\/doctrine\\\/dbal\\\/lib\\\/Doctrine\\\/DBAL\\\/Driver\\\/AbstractMySQLDriver.php\",\"Line\":66}","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.3.3 (build 1) (Nextcloud)","version":"13.0.0.14"} ```

[tapete]

Since I switched to file locking with Redis, the error is gone. This is good news I think but it also means that the traditional file locking is broken.

[Temtaime]

This error is annoying and i have tons of it in my logs. Also it makes desktop client stuck for a time.

[MorrisJobke]

Since I switched to file locking with Redis, the error is gone. This is good news I think but it also means that the traditional file locking is broken.

ref #7795

In more recent versions (13.0.4 and 12.0.9) we reduced drastically the amount of lock statements which should avoid most of the problems in here. Thus I will close it. If there is still stuff that breaks have a look at #9305 and it's linked issues.

[MorrisJobke]

Since I switched to file locking with Redis, the error is gone. This is good news I think but it also means that the traditional file locking is broken.

In more recent versions (13.0.4 and 12.0.9) we reduced drastically the amount of lock statements which should avoid most of the problems in here. Thus I will close it. If there is still stuff that breaks have a look at #9305 and it's linked issues.

[jirutka]

Since I switched to file locking with Redis, the error is gone. This is good news I think but it also means that the traditional file locking is broken.

The same here.

In more recent versions (13.0.4 and 12.0.9) we reduced drastically the amount of lock statements which should avoid most of the problems in here. Thus I will close it.

What? This is not a fix of the problem, just mitigation of the symptoms!

[MorrisJobke]

What? This is not a fix of the problem, just mitigation of the symptoms!

And I also said, that #9305 will hold more information. That ticket is for the race conditions on the SQL side and #8239 is for the race conditions on the Redis side. We just want to consolidate tickets and find common patterns.