The Basics
- Nextcloud Server version (e.g., 29.x.x):
32.0.8
- Operating system and version (e.g., Ubuntu 24.04):
Debian 13
- Web server and version (e.g, Apache 2.4.25):
Apache2.4.66-1~deb13u2
- Reverse proxy and version _(e.g. nginx 1.27.2)
None
- PHP version (e.g, 8.3):
8.4(Apache2 mod_php)
- Is this the first time you’ve seen this error? (Yes / No):
Seen this several times during the last few weeks
- When did this problem seem to first start?
After update from Nextcloud 31 to 32
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Bare Metal/Archive
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
When subscribing multiple Nextcloud calendars in Thunderbird (other clients seem to be ok), from time to time (can be minutes or days) Nextcloud hangs. This affects the web interface and Caldav/Carddav/Webdav access for everyone. New incoming requests simply start additional Apache processes, which also hang, consuming lots of CPU, until Apache’s process limit is reached.
There seems to be a deadlock somewhere.
Steps to replicate it (hint: details matter!):
-
Create around 20 calendars in Nextcloud
-
In Thunderbird (I’m using Debian’s 140.9ESR) subscribe to those calendars using CalDAV and set sync intervall to e.g. 5 minutes.
-
Wait
Log entries
Apache’s server-info page shows “W” (Waiting) for the hanging CalDAV “profind” and “get” requests.
Nextcloud
Nothing.
Web server / Reverse Proxy
Nothing.
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
{
"system": {
"debug": false,
"installed": true,
"dbtype": "mysql",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbtableprefix": "oc_",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"forcessl": false,
"trusted_domains": [
**REMOVED**
],
"overwrite.cli.url": "**REMOVED**",
"default_phone_region": "DE",
"logtimezone": "Europe\/Berlin",
"log_query": false,
"log_authfailip": true,
"log_rotate_size": 10485760,
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpdebug": false,
"mail_smtpmode": "sendmail",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "25",
"mail_smtptimeout": 10,
"memcache.local": "\\OC\\Memcache\\APCu",
"filelocking.enabled": true,
"memcache.locking": "\\OC\\Memcache\\Redis",
"memcache.distributed": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0,
"timeout": 0
},
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"apps_paths": [
{
"path": "\/var\/www\/nextcloud\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/nextcloud\/extra-apps",
"url": "\/extra-apps",
"writable": true
}
],
"enable_previews": true,
"enabledPreviewProviders": [
"OC\\Preview\\BMP",
"OC\\Preview\\GIF",
"OC\\Preview\\JPEG",
"OC\\Preview\\Krita",
"OC\\Preview\\MarkDown",
"OC\\Preview\\MP3",
"OC\\Preview\\OpenDocument",
"OC\\Preview\\PNG",
"OC\\Preview\\TXT",
"OC\\Preview\\XBitmap",
"OC\\Preview\\Font",
"OC\\Preview\\HEIC",
"OC\\Preview\\Illustrator",
"OC\\Preview\\Movie",
"OC\\Preview\\MSOffice2003",
"OC\\Preview\\MSOffice2007",
"OC\\Preview\\MSOfficeDoc",
"OC\\Preview\\PDF",
"OC\\Preview\\Photoshop",
"OC\\Preview\\Postscript",
"OC\\Preview\\StarOffice",
"OC\\Preview\\SVG",
"OC\\Preview\\TIFF"
],
"preview_max_scale_factor": 10,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"version": "32.0.8.2",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"appstore.experimental.enabled": true,
"updatechecker": false,
"loglevel": 2,
"theme": "",
"integrity.check.disabled": false,
"asset-pipeline.enabled": true,
"upgrade.disable-web": "true",
"logfile": "\/var\/log\/nextcloud\/nextcloud.log",
"mail_sendmailmode": "smtp",
"mysql.utf8mb4": true,
"ldapIgnoreNamingRules": false,
"ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
"simpleSignUpLink.shown": false,
"trashbin_retention_obligation": "30, 90",
"memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-glibc",
"memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64",
"memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
"memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
"memories.gis_type": 1,
"maintenance_window_start": "1",
"allow_local_remote_servers": "1",
"trusted_proxies": "***REMOVED SENSITIVE VALUE***"
}
}
Apps
The output of occ app:list (if possible).
Enabled:
- activity: 5.0.0
- bookmarks: 16.1.3
- calendar: 6.2.2
- checksum: 2.0.3
- circles: 32.0.0
- cloud_federation_api: 1.16.0
- comments: 1.22.0
- contacts: 8.3.7
- contactsinteraction: 1.13.1
- dav: 1.34.2
- epubviewer: 1.9.2
- event_update_notification: 2.8.0
- federatedfilesharing: 1.22.0
- federation: 1.22.0
- files: 2.4.0
- files_3dmodelviewer: 0.0.16
- files_antivirus: 6.2.0
- files_downloadactivity: 1.18.1
- files_downloadlimit: 5.0.0
- files_external: 1.24.1
- files_fulltextsearch: 32.0.2
- files_fulltextsearch_tesseract: 32.0.0
- files_pdfviewer: 5.0.0
- files_reminders: 1.5.0
- files_sharing: 1.24.1
- files_trashbin: 1.22.0
- files_versions: 1.25.0
- firstrunwizard: 5.0.0
- forms: 5.2.5
- fulltextsearch: 32.0.0
- fulltextsearch_elasticsearch: 32.0.2
- guests: 4.6.0
- integration_github: 3.2.2
- integration_gitlab: 4.0.0
- ldap_write_support: 1.14.1
- lookup_server_connector: 1.20.0
- mail: 5.7.6
- maps: 1.6.0
- music: 3.0.0
- notes: 4.13.1
- notifications: 5.0.0
- notify_push: 1.3.1
- oauth2: 1.20.0
- photos: 5.0.0
- polls: 8.6.3
- previewgenerator: 5.13.0
- privacy: 4.0.0
- profile: 1.1.0
- provisioning_api: 1.22.0
- quota_warning: 1.23.0
- related_resources: 3.0.0
- richdocuments: 9.0.5
- serverinfo: 4.0.0
- settings: 1.15.1
- sharebymail: 1.22.0
- spreed: 22.0.11
- systemtags: 1.22.0
- tasks: 0.17.1
- text: 6.0.1
- theming: 2.7.0
- twofactor_backupcodes: 1.21.0
- user_ldap: 1.23.0
- viewer: 5.0.0
- weather_status: 1.12.0
- webhook_listeners: 1.3.0
- workflowengine: 2.14.0
Tips for increasing the likelihood of a response
- Use the
preformatted textformatting option in the editor for all log entries and configuration output. - If screenshots are useful, feel free to include them.
- If possible, also include key error output in text form so it can be searched for.
- Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.