Errors logged in CalDAV provider

[arnowelzel]

Steps to reproduce

1. Opening the calendar in the browser.
2. Sometimes (but not always) an error is logged, even though the calendar is always display correct.

Expected behaviour

No errors occur in the log.

Actual behaviour

The following errors are logged on the server:

Undefined offset: 1 at /var/www/clients/client1/web28/web/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232
Undefined offset: 0 at /var/www/clients/client1/web28/web/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231
Undefined offset: 1 at /var/www/clients/client1/web28/web/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232
Undefined offset: 0 at /var/www/clients/client1/web28/web/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231

Server configuration

Operating system: Ubuntu 16.04

Web server: Apache 2.4

Database: MariaDB

PHP version: 7.0

Nextcloud version: 13.0.0

Updated from an older Nextcloud/ownCloud or fresh install: updated from 12.0.5

Where did you install Nextcloud from: nextcloud.com

Signing status:

Signing status

No errors have been found.

List of activated apps:

App list

Enabled:
  - activity: 2.6.1
  - apporder: 0.4.1
  - bookmarks: 0.10.1
  - bruteforcesettings: 1.0.3
  - calendar: 1.6.0
  - caniupdate: 0.1.2
  - comments: 1.3.0
  - contacts: 2.1.0
  - dav: 1.4.6
  - deck: 0.3.0
  - defaultlinkopen: 1.0.0
  - external: 3.0.2
  - federatedfilesharing: 1.3.1
  - federation: 1.3.0
  - files: 1.8.0
  - files_markdown: 2.0.1
  - 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
  - groupfolders: 1.2.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.1.0
  - mail: 0.7.9
  - news: 12.0.1
  - nextcloud_announcements: 1.2.0
  - notifications: 2.1.2
  - oauth2: 1.1.0
  - password_policy: 1.3.0
  - provisioning_api: 1.3.0
  - richdocuments: 1.12.40
  - serverinfo: 1.3.0
  - sharebymail: 1.3.0
  - socialsharing_email: 1.0.3
  - spreed: 3.0.1
  - survey_client: 1.1.0
  - systemtags: 1.3.0
  - tasks: 0.9.6
  - theming: 1.4.1
  - theming_customcss: 1.0.0
  - 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": [
            "nextcloud.0x0c.de"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/nextcloud.0x0c.de",
        "dbtype": "mysql",
        "version": "13.0.0.14",
        "installed": true,
        "htaccess.RewriteBase": "\/",
        "maintenance": false,
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "knowledgebaseenabled": false,
        "theme": "",
        "loglevel": 2,
        "mysql.utf8mb4": 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: none

Client configuration

Browser: Firefox 58.0.2 (x86-64)

Operating system: Windows 10

Logs

Web server error log

Web server error log

xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "GET /status.php HTTP/1.1" 200 4906 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "PROPFIND /remote.php/webdav/ HTTP/1.1" 207 1246 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "GET /ocs/v1.php/cloud/capabilities?format=json HTTP/1.1" 200 2384 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "GET /ocs/v1.php/cloud/user?format=json HTTP/1.1" 200 1079 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "GET /ocs/v1.php/cloud/activity?page=0&pagesize=100&format=json HTTP/1.1" 200 3575 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "GET /ocs/v2.php/apps/notifications/api/v1/notifications?format=json HTTP/1.1" 200 948 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
xxx.xxx.xxx.xxx - - [13/Feb/2018:19:19:16 +0100] "PROPFIND /remote.php/dav/files/awelzel/ HTTP/1.1" 207 4880 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"

Nextcloud log (data/nextcloud.log)

Nextcloud log

{"reqId":"PBG66EnNnQnsZs2gcrrV","level":3,"time":"2018-02-13T18:19:16+00:00","remoteAddr":"xxx.xxx.xxx.xxx","user":"xxxx","app":"PHP","method":"GET","url":"\/ocs\/v1.php\/cloud\/activity?page=0&pagesize=100&format=json","message":"Undefined offset: 0 at \/var\/www\/clients\/client1\/web28\/web\/apps\/dav\/lib\/CalDAV\/Activity\/Provider\/Calendar.php#231","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.3.3 (build 1) (Nextcloud)","version":"13.0.0.14"}
{"reqId":"PBG66EnNnQnsZs2gcrrV","level":3,"time":"2018-02-13T18:19:16+00:00","remoteAddr":"xxx.xxx.xxx.xxx","user":"xxxx","app":"PHP","method":"GET","url":"\/ocs\/v1.php\/cloud\/activity?page=0&pagesize=100&format=json","message":"Undefined offset: 1 at \/var\/www\/clients\/client1\/web28\/web\/apps\/dav\/lib\/CalDAV\/Activity\/Provider\/Calendar.php#232","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.3.3 (build 1) (Nextcloud)","version":"13.0.0.14"}
{"reqId":"PBG66EnNnQnsZs2gcrrV","level":3,"time":"2018-02-13T18:19:16+00:00","remoteAddr":"xxx.xxx.xxx.xxx","user":"xxxx","app":"PHP","method":"GET","url":"\/ocs\/v1.php\/cloud\/activity?page=0&pagesize=100&format=json","message":"Undefined offset: 0 at \/var\/www\/clients\/client1\/web28\/web\/apps\/dav\/lib\/CalDAV\/Activity\/Provider\/Calendar.php#231","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.3.3 (build 1) (Nextcloud)","version":"13.0.0.14"}
{"reqId":"PBG66EnNnQnsZs2gcrrV","level":3,"time":"2018-02-13T18:19:16+00:00","remoteAddr":"xxx.xxx.xxx.xxx","user":"xxxx","app":"PHP","method":"GET","url":"\/ocs\/v1.php\/cloud\/activity?page=0&pagesize=100&format=json","message":"Undefined offset: 1 at \/var\/www\/clients\/client1\/web28\/web\/apps\/dav\/lib\/CalDAV\/Activity\/Provider\/Calendar.php#232","userAgent":"Mozilla\/5.0 (Windows) mirall\/2.3.3 (build 1) (Nextcloud)","version":"13.0.0.14"}

I can confirm this.

Server configuration
Operating system: Debian 9.3
Web server: Nginx 1.10.3
Database: MariaDB
PHP version: 7.0
Nextcloud version: 13.0.0
Updated from an older Nextcloud/ownCloud or fresh install: Fresh install
Where did you install Nextcloud from: nextcloud.com

[Fixel2012]

I have currently the same problem with nextcloud 13 (up to date).

Is there already a fix for it?

[MoonshineSG]

13.0.2 has the same problem when adding certain .ics files (ex: from Tripit) . Some work, some don't....

[albirs]

+1
I have currently the same problem with nextcloud 13.0.2

[derpingit]

same issue here:

"Error	PHP	Undefined offset: 1 at /var/www/nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#234	
Error	PHP	Undefined offset: 0 at /var/www/nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#23

[MoonshineSG]

Any of the developers read these messages? Some sort of reply or acknowledgement would be appreciated

[livier]

+1

[zax-29]

+1

[serbik]

Also getting this on NC 13.0.2 , Calendar 1.6.1

Seems to log it it about 100x every 15 minutes (likely crown inducing it)

[MorrisJobke]

@georgehrke @nickvergessen @rullzer Could you have a look at this?

[georgehrke]

@nickvergessen Is getSubjectParameters() ever supposed to return an empty array?

https://github.com/nextcloud/server/blob/v13.0.0/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#L166
https://github.com/nextcloud/server/blob/v13.0.0/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#L232

[nickvergessen]

Fixed with #10078