Core: Error 12 interacting with memcached : CONNECTION DATA EXISTS

[kwisatz]

Steps to reproduce

1. Install memcached
2. Set up memcached for file locking
3.

Expected behaviour

Use memcached successfully for file locking, do not throw exceptions

Actual behaviour

Getting exceptions in the log for any file operation:

{
"reqId":"0b3b441c-08dd-4b05-b7ce-40f050660431",
"level":3,
"time":"2018-05-04T07:23:38+00:00",
"remoteAddr":"195.218.30.41",
"user":"********************",
"app":"no app in context",
"method":"DELETE",
"url":"/remote.php/dav/files/********************/********************/Formulaire********************.docx",
"message":"Exception: {"Exception":"Exception","Message":"Error 12 interacting with memcached : CONNECTION DATA EXISTS","Code":0,"Trace":"#0 

Full log entry below.

Server configuration

Operating system: Debian 8.10

Web server: Apache 2.4

Database: Mysql 5.5

PHP version: 5.6.33

ownCloud version: 10.0.8.5

Updated from an older ownCloud or fresh install: Updated from 9.1.6.2

Where did you install ownCloud from: package manager

The content of config/config.php:

{
    "system": {
        "debug": false,
        "updatechecker": false,
        "instanceid": "ocn9d23yezta",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "my.domain.tld"
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/my.domain.tld",
        "htaccess.RewriteBase": "\/",
        "dbtype": "mysql",
        "version": "10.0.8.5",
        "dbname": "owncloud",
        "dbhost": "localhost",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "maintenance": false,
        "loglevel": 2,
        "log_type": "owncloud",
        "logfile": "\/var\/log\/owncloud\/owncloud.log",
        "logtimezone": "UTC",
        "filelocking.enabled": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Memcached",
        "memcached_servers": [
            [
                "localhost",
                11211
            ]
        ],
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "theme": ""
    }
}

Are you using external storage, if yes which one: no

Are you using encryption: no

Are you using an external user-backend, if yes which one: No

Logs

ownCloud log (data/owncloud.log)

{"reqId":"0b3b441c-08dd-4b05-b7ce-40f050660431","level":3,"time":"2018-05-04T07:23:38+00:00","remoteAddr":"*************","user":"***********","app":"no app in context","method":"DELETE","url":"\/remote.php\/dav\/files\/***********\/Horaires\/Formulaire%20de%20cong%C3%A9_Kevin.docx","message":"Exception: {\"Exception\":\"Exception\",\"Message\":\"Error 12 interacting with memcached : CONNECTION DATA EXISTS\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Memcache\\\/Memcached.php(170): OC\\\\Memcache\\\\Memcached->verifyReturnCode()\\n#1 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Memcache\\\/Memcached.php(183): OC\\\\Memcache\\\\Memcached->add('files\\\/ac34ff928...', 0)\\n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Lock\\\/MemcacheLockingProvider.php(79): OC\\\\Memcache\\\\Memcached->inc('files\\\/ac34ff928...')\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Common.php(653): OC\\\\Lock\\\\MemcacheLockingProvider->acquireLock('files\\\/ac34ff928...', 1)\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(589): OC\\\\Files\\\\Storage\\\\Common->acquireLock('files\\\/Horaires\\\/...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(589): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/Horaires\\\/...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#6 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(589): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/Horaires\\\/...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#7 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1973): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/Horaires\\\/...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#8 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(2075): OC\\\\Files\\\\View->lockPath('\\\/Horaires\\\/Formu...', 1, false)\\n#9 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1356): OC\\\\Files\\\\View->lockFile('\\\/Horaires\\\/Formu...', 1)\\n#10 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1403): OC\\\\Files\\\\View->getCacheEntry(Object(OC\\\\Files\\\\Storage\\\\Wrapper\\\\Checksum), 'files\\\/Horaires\\\/...', '\\\/Horaires\\\/Formu...')\\n#11 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Node\\\/HookConnector.php(143): OC\\\\Files\\\\View->getFileInfo('\\\/Horaires\\\/Formu...')\\n#12 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Node\\\/HookConnector.php(103): OC\\\\Files\\\\Node\\\\HookConnector->getNodeForPath('\\\/Horaires\\\/Formu...')\\n#13 [internal function]: OC\\\\Files\\\\Node\\\\HookConnector->postDelete(Array)\\n#14 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/hook.php(105): call_user_func(Array, Array)\\n#15 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1298): OC_Hook::emit('OC_Filesystem', 'post_delete', Array)\\n#16 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1224): OC\\\\Files\\\\View->runHooks(Array, '\\\/Horaires\\\/Formu...', true)\\n#17 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(737): OC\\\\Files\\\\View->basicOperation('unlink', '\\\/Horaires\\\/Formu...', Array)\\n#18 \\\/var\\\/www\\\/owncloud\\\/lib\\\/public\\\/Events\\\/EventEmitterTrait.php(50): OC\\\\Files\\\\View->OC\\\\Files\\\\{closure}(Array)\\n#19 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(747): OC\\\\Files\\\\View->emittingCall(Object(Closure), Array, 'file', 'delete')\\n#20 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/File.php(402): OC\\\\Files\\\\View->unlink('\\\/Horaires\\\/Formu...')\\n#21 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Tree.php(179): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\File->delete()\\n#22 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(287): Sabre\\\\DAV\\\\Tree->delete('files\\\/******...')\\n#23 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpDelete(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#24 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#25 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:DELETE', Array)\\n#26 \\\/var\\\/www\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#27 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(278): Sabre\\\\DAV\\\\Server->exec()\\n#28 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#29 \\\/var\\\/www\\\/owncloud\\\/remote.php(165): require_once('\\\/var\\\/www\\\/ownclo...')\\n#30 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/Memcache\\\/Memcached.php\",\"Line\":223}"}

[IljaN]

Have you tried to upgrade php to 7.1? 5.6 is not supported with 10.0.8, see https://doc.owncloud.org/server/latest/admin_manual/release_notes.html#changes-in-10-0-8

[kwisatz]

It actually states here that 5.6 will only be deprecated starting with 10.1.

https://doc.owncloud.com/server/latest/admin_manual/installation/system_requirements.html#officially-recommended-supported-options

And the package didn't have any such dependencies. I'd expect it to have those.

[phil-davis]

Yes, PHP 5.6.33 is supported and also works with ownCloud 10.0.8

So the issue here "must" be some interaction with memcached

But of course, everyone, everywhere, on every server (not just ownCloud) is encouraged to upgrade away from PHP 5.6 as soon as they can.

[IljaN]

Sorry for the noise :)

[SmartOPZ]

Same issue here with a fresh 10.8.5 install.
Same with previous 10.0.7.2.

   'memcache.local' => '\\OC\\Memcache\\Memcached',
   'memcache.locking' => '\\OC\\Memcache\\Memcached',
   'memcached_servers' => array(
        array('localhost', 11211),
   ),

Debian 9 environment :

• PHP 7.0.27-0+deb9u1
• memcached 1.4.33-1

Any clue on how to solve this issue ?
Thx 👍

[patrickjahns]

@SmartOPZ @kwisatz

It would be great if you could provide the full stack trace of the error message

[kwisatz]

@patrickjahns, I believe my log entry should contain the whole - while not word-wrapped - stack trace. Or is there something more I can provide?

Sent from my Android device with K-9 Mail. Please excuse my brevity.

[SmartOPZ]

I reproduced the issus to get the full stacktrace, here it is :

{"reqId":"aZ7PVQfLD8YXPPDZyLii",
"level":3,"time":"2018-05-18T06:44:45+00:00",
"remoteAddr":"192.168.10.120",
"user":"admin",
"app":"no app in context",
"method":"DELETE",
"url":"\/remote.php\/webdav\/ownCloud%20Manual.pdf",
"message":"Exception: {\"Exception\":\"Exception\",\"Message\":\"Error 12 interacting with memcached : CONNECTION DATA EXISTS\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Memcache\\\/Memcached.php(170): OC\\\\Memcache\\\\Memcached->verifyReturnCode()\\n#1 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Memcache\\\/Memcached.php(183): OC\\\\Memcache\\\\Memcached->add('files\\\/22b849c6d...', 0)\\n#2 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Lock\\\/MemcacheLockingProvider.php(79): OC\\\\Memcache\\\\Memcached->inc('files\\\/22b849c6d...')\\n#3 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/Storage\\\/Common.php(653): OC\\\\Lock\\\\MemcacheLockingProvider->acquireLock('files\\\/22b849c6d...', 1)\\n#4 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(589): OC\\\\Files\\\\Storage\\\\Common->acquireLock('files\\\/ownCloud ...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#5 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(589): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/ownCloud ...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#6 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(589): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/ownCloud ...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#7 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(1972): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/ownCloud ...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#8 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(2075): OC\\\\Files\\\\View->lockPath('\\\/ownCloud Manua...', 1, false)\\n#9 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(1356): OC\\\\Files\\\\View->lockFile('\\\/ownCloud Manua...', 1)\\n#10 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(1403): OC\\\\Files\\\\View->getCacheEntry(Object(OCA\\\\Files_Trashbin\\\\Storage), 'files\\\/ownCloud ...', '\\\/ownCloud Manua...')\\n#11 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/Node\\\/HookConnector.php(143): OC\\\\Files\\\\View->getFileInfo('\\\/admin\\\/files\\\/ow...')\\n#12 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/Node\\\/HookConnector.php(103): OC\\\\Files\\\\Node\\\\HookConnector->getNodeForPath('\\\/ownCloud Manua...')\\n#13 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/legacy\\\/hook.php(105): OC\\\\Files\\\\Node\\\\HookConnector->postDelete(Array)\\n#14 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(1296): OC_Hook::emit('OC_Filesystem', 'post_delete', Array)\\n#15 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(1224): OC\\\\Files\\\\View->runHooks(Array, '\\\/ownCloud Manua...', true)\\n#16 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(737): OC\\\\Files\\\\View->basicOperation('unlink', '\\\/ownCloud Manua...', Array)\\n#17 \\\/var\\\/www\\\/\\\/lib\\\/public\\\/Events\\\/EventEmitterTrait.php(50): OC\\\\Files\\\\View->OC\\\\Files\\\\{closure}(Array)\\n#18 \\\/var\\\/www\\\/\\\/lib\\\/private\\\/Files\\\/View.php(747): OC\\\\Files\\\\View->emittingCall(Object(Closure), Array, 'file', 'delete')\\n#19 \\\/var\\\/www\\\/\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/File.php(402): OC\\\\Files\\\\View->unlink('\\\/ownCloud Manua...')\\n#20 \\\/var\\\/www\\\/\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Tree.php(179): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\File->delete()\\n#21 \\\/var\\\/www\\\/\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(287): Sabre\\\\DAV\\\\Tree->delete('ownCloud Manual...')\\n#22 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpDelete(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#23 \\\/var\\\/www\\\/\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#24 \\\/var\\\/www\\\/\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:DELETE', Array)\\n#25 \\\/var\\\/www\\\/\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#26 \\\/var\\\/www\\\/\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(63): Sabre\\\\DAV\\\\Server->exec()\\n#27 \\\/var\\\/www\\\/\\\/remote.php(165): require_once('\\\/home\\\/client.rl...')\\n#28 {main}\",\"File\":\"\\\/var\\\/www\\\/\\\/lib\\\/private\\\/Memcache\\\/Memcached.php\",\"Line\":223}"}

[elonmir]

Same thing here.

[jawrat]

I was getting the same error and found that by removing memcache.locking from my config, it fixed the issue and file synchronization is now working as expected.

[kirkwor]

Same happening on a fresh install Centos 7.5.1804 (Core), nginx-1.14, PHP 7.2.7, memcached-1.4.15-10, owncloud-files-10.0.8-1.1.

[madpsy]

@jawrat That 'solution' worked for me (just comment 'memcache.locking' out in config.php) . Unsure of any negative side affects with disabling locking but sure I'll find out over time.

[paraqles]

Same problem here.
Disabling locking for now helps -> maybe decrease in performance.

Another hint: seems only affecting new users, and those that do not log in regularly.

owncloud version: 10.0.2.1
php version: 7.1.8
php memcache version: 3.0.3
libmemcached version: 1.0.18

running in nginx with php-fpm and fcgi.

[benrubson]

Same issue here with version 10.0.10.
@patrickjahns, @phil-davis some news on this perhaps ?
Thank you very much 👍

{"reqId":"M8rhULN83VVM9wamQlXC",
"level":3,"time":"2019-01-03T07:43:53+00:00",
"remoteAddr":"109.210.55.124",
"user":"admin",
"app":"no app in context",
"method":"DELETE",
"url":"\/remote.php\/webdav\/FileShot201.txt","message":"Exception: {\"Exception\":\"Exception\",\"Message\":\"Error 12 interacting with memcached : CONNECTION DATA EXISTS\",\"Code\":0,\"Trace\":\"#0 \\\/owncloud\\\/lib\\\/private\\\/Memcache\\\/Memcached.php(170): OC\\\\Memcache\\\\Memcached->verifyReturnCode()\\n#1 \\\/owncloud\\\/lib\\\/private\\\/Memcache\\\/Memcached.php(183): OC\\\\Memcache\\\\Memcached->add('files\\\/6dd80b2c4...', 0)\\n#2 \\\/owncloud\\\/lib\\\/private\\\/Lock\\\/MemcacheLockingProvider.php(79): OC\\\\Memcache\\\\Memcached->inc('files\\\/6dd80b2c4...')\\n#3 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Common.php(657): OC\\\\Lock\\\\MemcacheLockingProvider->acquireLock('files\\\/6dd80b2c4...', 1)\\n#4 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(588): OC\\\\Files\\\\Storage\\\\Common->acquireLock('files\\\/FileSh...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#5 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/Storage\\\/Wrapper\\\/Wrapper.php(588): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/FileSh...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#6 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1975): OC\\\\Files\\\\Storage\\\\Wrapper\\\\Wrapper->acquireLock('files\\\/FileSh...', 1, Object(OC\\\\Lock\\\\MemcacheLockingProvider))\\n#7 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(2078): OC\\\\Files\\\\View->lockPath('\\\/FileShot20...', 1, false)\\n#8 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1361): OC\\\\Files\\\\View->lockFile('\\\/FileShot20...', 1)\\n#9 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1408): OC\\\\Files\\\\View->getCacheEntry(Object(OC\\\\Files\\\\Storage\\\\Wrapper\\\\Checksum), 'files\\\/FileSh...', '\\\/FileShot20...')\\n#10 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/Node\\\/HookConnector.php(143): OC\\\\Files\\\\View->getFileInfo('\\\/admin\\\/files\\\/File...')\\n#11 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/Node\\\/HookConnector.php(103): OC\\\\Files\\\\Node\\\\HookConnector->getNodeForPath('\\\/FileShot20...')\\n#12 \\\/owncloud\\\/lib\\\/private\\\/legacy\\\/hook.php(105): OC\\\\Files\\\\Node\\\\HookConnector->postDelete(Array)\\n#13 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1301): OC_Hook::emit('OC_Filesystem', 'post_delete', Array)\\n#14 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(1226): OC\\\\Files\\\\View->runHooks(Array, '\\\/FileShot20...', true)\\n#15 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(739): OC\\\\Files\\\\View->basicOperation('unlink', '\\\/FileShot20...', Array)\\n#16 \\\/owncloud\\\/lib\\\/public\\\/Events\\\/EventEmitterTrait.php(50): OC\\\\Files\\\\View->OC\\\\Files\\\\{closure}(Array)\\n#17 \\\/owncloud\\\/lib\\\/private\\\/Files\\\/View.php(749): OC\\\\Files\\\\View->emittingCall(Object(Closure), Array, 'file', 'delete')\\n#18 \\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Connector\\\/Sabre\\\/File.php(422): OC\\\\Files\\\\View->unlink('\\\/FileShot20...')\\n#19 \\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Tree.php(179): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\File->delete()\\n#20 \\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(287): Sabre\\\\DAV\\\\Tree->delete('FileShot201...')\\n#21 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpDelete(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#22 \\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#23 \\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(479): Sabre\\\\Event\\\\EventEmitter->emit('method:DELETE', Array)\\n#24 \\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#25 \\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(64): Sabre\\\\DAV\\\\Server->exec()\\n#26 \\\/owncloud\\\/remote.php(165): require_once('\\\/owncloud...')\\n#27 {main}\",\"File\":\"\\\/owncloud\\\/lib\\\/private\\\/Memcache\\\/Memcached.php\",\"Line\":223}"}

[Shucach]

Sometimes i have the same error. It happens when i load some video from PC
witch version 10.0.10 php-7.0

[Shucach]

I was getting the same error and found that by removing memcache.locking from my config, it fixed the issue and file synchronization is now working as expected.

I did the same and it's really helped me.

[Nikolo]

Same issue here with version 10.0.10.4
OS: FreeBSD 11.2-RELEASE-p5
PHP: PHP 7.1.24 (cli) (built: Nov 29 2018 01:24:22) ( NTS )

[V1pr]

Same issue here, disabling locking solved the issue.
OC: 10.0.10
OS: Debian 9.7
PHP: 7.0.33-0+deb9u1

[ghost]

Still getting the same error.
"Exception: Error 12 interacting with memcached : CONNECTION DATA EXISTS

Upload going successfully after trying a couple of minutes of failure.
Any quick fix ?

[mrodriguezmad]

Same error with:
Owncloud: 10.2.0.5
Memcached: 1.4.33
PHP: 7.0.33 (via FPM)

Config:
'memcache.locking' => '\OC\Memcache\Memcached',
'memcache.local' => '\OC\Memcache\Memcached',
'memcache.distributed' => '\OC\Memcache\Memcached',
'memcached_servers' =>
array (
0 =>
array (
0 => 'localhost',
1 => 11211,
),
),

[benrubson]

Still facing this with 10.3.0 version.
Could it be possible to have a look at it please ?
Thank you very much 👍

[Lord-Y]

Same issue here which 10.3.1 version. Sounds like the issue is coming from 'memcache.locking' => '\OC\Memcache\Memcached',. I disabled file locking for now and waiting for the fix.

[ho4ho]

'memcache.locking' => '\OC\Memcache\Memcached',

https://doc.owncloud.com/server/10.3/admin_manual/configuration/server/caching_configuration.html#memcached reads by:

it is not suitable to use with Transactional File Locking

All (@kwisatz, @SmartOPZ, @elonmir, @jawrat, @kirkwor, @madpsy, @paraqles, @benrubson, @Shucach, @Nikolo, @V1pr, @mrodriguezmad, @Lord-Y) seem using wrongly configuration for locking. Correctly use Redis insted? https://doc.owncloud.org/server/10.3/admin_manual/configuration/server/caching_configuration.html#configuring-transactional-file-locking

Text "Memcached, the popular distributed memory caching system, is not suitable for the new file locking because" seem there since long time:

https://doc.owncloud.org/server/9.0/admin_manual/configuration_files/files_locking_transactional.html

[kwisatz]

'memcache.locking' => '\OC\Memcache\Memcached',

https://doc.owncloud.com/server/10.3/admin_manual/configuration/server/caching_configuration.html#memcached reads by:

it is not suitable to use with Transactional File Locking

Ha, we must all be blind…

[benrubson]

Ha, we must all be blind…

Not sure, more than a recommendation not to use it (related to how Memcache works), it should at least work, and not raise this exception, IMO.

[ho4ho]

it should at least work

If not suitable not implemented by ownCloud?

and not raise this exception, IMO.

Thinking same, create new issue for ownCloud? (ownCloud could log "Only redis supported by filelocking"?)

[ho4ho]

Not good in coding but maybe help by #36484