Cron and OCC appear to leak massive amounts of memory when a cache is enabled

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Steps to reproduce

Add any kind of cache declaration to the config e.g. 'memcache.local' => '\\OC\\Memcache\\Redis', (it doesn't actually have to work)
run cron or any OCC command, such as occ list
watch the memory usage rocket to gigabytes in seconds until the system grinds to a halt

Expected behaviour

occ list should not exhaust system memory

Actual behaviour

occ list exhausts system memory

Server configuration

Operating system: Ubuntu 20.04

Web server: Apache2

Database: Postgresql 12

PHP version: 7.4

Nextcloud version: (see Nextcloud admin page) 21.0

Updated from an older Nextcloud/ownCloud or fresh install: I tried both

Where did you install Nextcloud from: updater.phar as well as nextcloud.com zip

Signing status:

Signing status

No errors have been found.

List of activated apps:

App list

Enabled:
  - accessibility: 1.7.0
  - activity: 2.14.3
  - calendar: 2.1.3
  - cloud_federation_api: 1.4.0
  - comments: 1.11.0
  - contactsinteraction: 1.2.0
  - dashboard: 7.1.0
  - dav: 1.17.1
  - federatedfilesharing: 1.11.0
  - federation: 1.11.0
  - files: 1.16.0
  - files_automatedtagging: 1.11.0
  - files_external: 1.12.0
  - files_pdfviewer: 2.1.0
  - files_rightclick: 1.0.0
  - files_sharing: 1.13.1
  - files_trashbin: 1.11.0
  - files_versions: 1.14.0
  - files_videoplayer: 1.10.0
  - firstrunwizard: 2.10.0
  - logreader: 2.6.0
  - lookup_server_connector: 1.9.0
  - nextcloud_announcements: 1.10.0
  - notifications: 2.9.0
  - oauth2: 1.9.0
  - password_policy: 1.11.0
  - photos: 1.3.0
  - privacy: 1.5.0
  - provisioning_api: 1.11.0
  - recommendations: 1.0.0
  - serverinfo: 1.11.0
  - settings: 1.3.0
  - sharebymail: 1.11.0
  - support: 1.4.0
  - survey_client: 1.9.0
  - systemtags: 1.11.0
  - text: 3.2.0
  - theming: 1.12.0
  - twofactor_backupcodes: 1.10.0
  - updatenotification: 1.11.0
  - user_status: 1.1.1
  - viewer: 1.5.0
  - weather_status: 1.1.0
  - workflowengine: 2.3.0
Disabled:
  - admin_audit
  - encryption
  - user_ldap

Nextcloud configuration:

Config report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost:8180",
            "example.com",
            "nextcloud.example.com"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/nextcloud.example.com",
        "dbtype": "pgsql",
        "version": "21.0.0.18",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "maintenance": false,
        "theme": "",
        "loglevel": 0,
        "log_type": "syslog",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "updater.release.channel": "stable",
        "app_install_overwrite": [
            "calendar",
            "direct_menu",
            "keeporsweep"
        ],
        "encryption.legacy_format_support": false,
    }
}

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

Client configuration

Browser: N/A

Operating system: N/A

Logs

N/A, no output appears to be produced on stdout or any of the logs.

Hello,
Thank god i found this ticket!
I have the same issue with a similar setup:
I just use nginx instead of apache and APCu.

Fun fact: i commented the APCu line in my config.php and after running the cron without problem (for the first time since updating to NC21) i reopened the config.php and the line is completely gone.

i didn't erase it but it's gone. Pure magic

Same issue here with a fresh 21.0.1 on Debian buster with "PHP 7.3.27-1~deb10u1" and APCu enabled as memcache.local. Commenting it out helped. #26154 probably describes the same/a similar issue.

Closing in favour of #25742

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Cron and OCC appear to leak massive amounts of memory when a cache is enabled #26184

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Cron and OCC appear to leak massive amounts of memory when a cache is enabled #26184

Description

How to use GitHub

Steps to reproduce

Expected behaviour

Actual behaviour

Server configuration

Client configuration

Logs

Activity

beankylla commented on Apr 6, 2021

vorlon commented on Apr 8, 2021

kesselb commented on Apr 9, 2021

qinohe commented on Apr 9, 2021

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