[Bug]: Nextcloud 29 rc2: spams log with BlurHash messages

[wom-bat]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After updating to Nextcloud 29 rc2 I see the log spammed with thousands of messages like this:

Error	PHP	
imagecreatefromstring(): Data is not in a recognized format at /var/www/nextcloud/lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php#117
"5 Apr 2024, 8:26:23 am"	
Error	PHP	
imagecreatefromstring(): Data is not in a recognized format at /var/www/nextcloud/lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php#117
"5 Apr 2024, 8:26:20 am"	
Error	PHP	
imagecreatefromstring(): Data is not in a recognized format at /var/www/nextcloud/lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php#117
"5 Apr 2024, 8:26:19 am"	
Error	PHP	
imagecreatefromstring(): Data is not in a recognized format at /var/www/nextcloud/lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php#117
"5 Apr 2024, 8:26:04 am"	
Error	PHP	
imagecreatefromstring(): Data is not in a recognized format at /var/www/nextcloud/lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php#117
"5 Apr 2024, 8:26:04 am"	

Steps to reproduce

Upgraded existing system to version 29 rc2; then the messages appear. I have around 25000 photos in the nextcloud instance, mostly Jpegs, but some GIF and some in PENTAX Rawformat. It's not obvious to me which are causing the issue.

Expected behavior

I do not expect to see these errors in the logs.

Installation method

Community Web installer on a VPS or web space

Nextcloud Server version

29

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 22 to 23)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

"dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "forcessl": false,
        "blacklisted_files": [
            ".htaccess"
        ],
        "overwritehost": "",
        "overwriteprotocol": "",
        "overwritewebroot": "",
        "overwritecondaddr": "",
        "overwrite.cli.url": "https:\/\/nextcloud.chubb.wattle.id.au\/",
        "theme": "",
        "default_language": "en",
        "3rdpartyroot": "",
        "3rdpartyurl": "",
        "defaultapp": "web",
        "knowledgebaseenabled": true,
        "mail_smtpdebug": false,
        "mail_smtpmode": "sendmail",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "mail_smtptimeout": 10,
        "mail_smtpauthtype": "LOGIN",
        "trashbin_retention_obligation": "180, auto",
        "allow_user_to_change_display_name": true,
        "appcodechecker": "",
        "updatechecker": false,
        "log_type": "file",
        "log_query": true,
        "logfile": "\/var\/nextcloud\/data\/owncloud.log",
        "loglevel": 2,
        "filelocking.enabled": true,
        "filelocking.ttl": 3600,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***"
        },
        "remember_login_cookie_lifetime": 1296000,
        "session_lifetime": 86400,
        "custom_csp_policy": "default-src 'self'; script-src 'self' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; frame-src *; img-src *; font-src 'self' data:; media-src *",
        "xframe_restriction": true,
        "customclient_desktop": "",
        "customclient_android": "",
        "customclient_ios": "",
        "logdateformat": "F d, Y H:i:s",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "version": "29.0.0.15",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***,
            "***REMOVED SENSITIVE VALUE***"
        ],
        "secret": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "enabledPreviewProviders": [
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\MP3",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\OpenDocument",
            "OC\\Preview\\Krita"
        ],
        "appstoreenabled": true,
        "appstoreurl": "https:\/\/apps.nextcloud.com\/api\/v1",
        "apps-paths": [
            {
                "path": "\/var\/www\/nextcloud\/apps",
                "url": "\/apps",
                "writable": "false"
            },
            {
                "path": "\/var\/www\/nextcloud\/apps2",
                "url": "\/apps2",
                "writable": "true"
            }
        ],
        "maintenance": false,
        "maintenance_window_start": 1,
        "web.baseUrl": "https:\/\/*** REMOVED SENSITIVE DATA***/",
        "web.rewriteLinks": false,
        "htaccess.rewriteBase": "\/",
        "allow_user_to_change_mail_address": true,
        "token_auth_enforced": false,
        "files_external_allow_create_new_local": true,
        "ldapIgnoreNamingRules": false,
        "default_phone_region": "AU",
        "updater.server.url": "https:\/\/updates.nextcloud.com\/updater_server\/",
        "updater.release.channel": "beta",
        "mysql.utf8mb4": true,
        "enable_file_metadata": true,
        "app_install_overwrite": [
            "impersonate",
            "duplicatefinder",
            "dropit"
        ]
    }
}

List of activated Apps

- cloud_federation_api: 1.12.0
  - comments: 1.19.0
  - contacts: 6.0.0-rc.1
  - contactsinteraction: 1.10.0
  - dashboard: 7.9.0
  - dav: 1.30.1
  - deck: 1.13.0-beta.1
  - federatedfilesharing: 1.19.0
  - federation: 1.19.0
  - files: 2.1.0
  - files_downloadlimit: 2.0.0
  - files_external: 1.21.0
  - files_pdfviewer: 2.10.0
  - files_reminders: 1.2.0
  - files_sharing: 1.21.0
  - files_trashbin: 1.19.0
  - files_versions: 1.22.0
  - impersonate: 1.16.0
  - logreader: 2.14.0
  - lookup_server_connector: 1.17.0
  - nextcloud_announcements: 1.18.0
  - notifications: 2.17.0
  - oauth2: 1.17.0
  - password_policy: 1.19.0
  - photos: 2.5.0
  - privacy: 1.13.0
  - provisioning_api: 1.19.0
  - recognize: 6.1.1
  - recommendations: 2.1.0
  - related_resources: 1.4.0
  - serverinfo: 1.19.0
  - settings: 1.12.0
  - sharebymail: 1.19.0
  - support: 1.12.0
  - survey_client: 1.17.0
  - suspicious_login: 7.0.0
  - systemtags: 1.19.0
  - text: 3.10.0
  - theming: 2.4.0
  - twofactor_backupcodes: 1.18.0
  - updatenotification: 1.19.1
  - user_ldap: 1.20.0
  - user_status: 1.9.0
  - viewer: 2.3.0
  - weather_status: 1.9.0
  - workflowengine: 2.11.0
Disabled:
  - admin_audit: 1.19.0
  - bruteforcesettings: 2.9.0
  - duplicatefinder: 1.1.4 (installed 0.0.15)
  - encryption: 2.17.0
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - firstrunwizard: 2.18.0 (installed 1.1)
  - ldap_write_support: 1.9.0 (installed 1.9.0)
  - music: 1.10.0 (installed 1.10.0)
  - twofactor_totp: 11.0.0-dev

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

{"reqId":"AeiPgLj3OMQy0CQqYxgh","level":3,"time":"2024-04-04T21:28:28+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"imagecreatefromstring(): Data is not in a recognized format at /var/www/nextcloud/lib/private/Blurhash/Listener/GenerateBlurhashMetadata.php#117","userAgent":"--","version":"29.0.0.15","data":{"app":"PHP"},"id":"6610d3bbd80cf"}

Additional info

No response