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Steps to reproduce

1. Have users on your installation with set up mail accounts
2. Have suspicious login also enabled (might be important)
3. Run cron jobs

Expected behavior

Nothing happens in the logs

Actual behavior

Our log shows this error 506 times for the last 2 weeks:

{
  "reqId": "jF18I3StppDQxCchnn0q",
  "level": 3,
  "time": "2022-03-22T16:50:50+00:00",
  "remoteAddr": "",
  "user": "--",
  "app": "mail",
  "method": "",
  "url": "--",
  "message": "Cron mail sync failed for account 65",
  "userAgent": "--",
  "version": "23.0.3.2",
  "exception": {
    "Exception": "OCA\\Mail\\Exception\\ServiceException",
    "Message": "Sync failed for 65:INBOX: Dataset must contain samples with exactly 3 dimensions, 4 given.",
    "Code": 0,
    "Trace": [
      {
        "file": "/var/www/html/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
        "line": 135,
        "function": "sync",
        "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
        "type": "->"
      },
      {
        "file": "/var/www/html/apps/mail/lib/BackgroundJob/SyncJob.php",
        "line": 109,
        "function": "syncAccount",
        "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
        "type": "->"
      },
      {
        "file": "/var/www/html/lib/public/BackgroundJob/Job.php",
        "line": 79,
        "function": "run",
        "class": "OCA\\Mail\\BackgroundJob\\SyncJob",
        "type": "->"
      },
      {
        "file": "/var/www/html/lib/public/BackgroundJob/TimedJob.php",
        "line": 95,
        "function": "execute",
        "class": "OCP\\BackgroundJob\\Job",
        "type": "->"
      },
      {
        "file": "/var/www/html/cron.php",
        "line": 150,
        "function": "execute",
        "class": "OCP\\BackgroundJob\\TimedJob",
        "type": "->"
      }
    ],
    "File": "/var/www/html/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
    "Line": 249,
    "Previous": {
      "Exception": "Rubix\\ML\\Exceptions\\IncorrectDatasetDimensionality",
      "Message": "Dataset must contain samples with exactly 3 dimensions, 4 given.",
      "Code": 0,
      "Trace": [
        {
          "file": "/var/www/html/apps/suspicious_login/vendor/rubix/ml/src/Classifiers/GaussianNB.php",
          "line": 297,
          "function": "check",
          "class": "Rubix\\ML\\Specifications\\DatasetHasDimensionality",
          "type": "->"
        },
        {
          "file": "/var/www/html/apps/mail/lib/Service/Classification/ImportanceClassifier.php",
          "line": 327,
          "function": "predict",
          "class": "Rubix\\ML\\Classifiers\\GaussianNB",
          "type": "->"
        },
        {
          "file": "/var/www/html/apps/mail/lib/Listener/NewMessageClassificationListener.php",
          "line": 118,
          "function": "classifyImportance",
          "class": "OCA\\Mail\\Service\\Classification\\ImportanceClassifier",
          "type": "->"
        },
        {
          "file": "/var/www/html/lib/private/EventDispatcher/ServiceEventListener.php",
          "line": 87,
          "function": "handle",
          "class": "OCA\\Mail\\Listener\\NewMessageClassificationListener",
          "type": "->"
        },
        {
          "file": "/var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php",
          "line": 251,
          "function": "__invoke",
          "class": "OC\\EventDispatcher\\ServiceEventListener",
          "type": "->"
        },
        {
          "file": "/var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php",
          "line": 73,
          "function": "callListeners",
          "class": "Symfony\\Component\\EventDispatcher\\EventDispatcher",
          "type": "->"
        },
        {
          "file": "/var/www/html/lib/private/EventDispatcher/EventDispatcher.php",
          "line": 88,
          "function": "dispatch",
          "class": "Symfony\\Component\\EventDispatcher\\EventDispatcher",
          "type": "->"
        },
        {
          "file": "/var/www/html/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
          "line": 380,
          "function": "dispatch",
          "class": "OC\\EventDispatcher\\EventDispatcher",
          "type": "->"
        },
        {
          "file": "/var/www/html/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
          "line": 230,
          "function": "runPartialSync",
          "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
          "type": "->"
        },
        {
          "file": "/var/www/html/apps/mail/lib/Service/Sync/ImapToDbSynchronizer.php",
          "line": 135,
          "function": "sync",
          "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
          "type": "->"
        },
        {
          "file": "/var/www/html/apps/mail/lib/BackgroundJob/SyncJob.php",
          "line": 109,
          "function": "syncAccount",
          "class": "OCA\\Mail\\Service\\Sync\\ImapToDbSynchronizer",
          "type": "->"
        },
        {
          "file": "/var/www/html/lib/public/BackgroundJob/Job.php",
          "line": 79,
          "function": "run",
          "class": "OCA\\Mail\\BackgroundJob\\SyncJob",
          "type": "->"
        },
        {
          "file": "/var/www/html/lib/public/BackgroundJob/TimedJob.php",
          "line": 95,
          "function": "execute",
          "class": "OCP\\BackgroundJob\\Job",
          "type": "->"
        },
        {
          "file": "/var/www/html/cron.php",
          "line": 150,
          "function": "execute",
          "class": "OCP\\BackgroundJob\\TimedJob",
          "type": "->"
        }
      ],
      "File": "/var/www/html/apps/suspicious_login/vendor/rubix/ml/src/Specifications/DatasetHasDimensionality.php",
      "Line": 64
    },
    "CustomMessage": "Cron mail sync failed for account 65"
  },
  "id": "623a30d26bda1"
}

Note at the end that the DatasetHasDimensionality seems to be loaded from another app, so there might be a different version?

      "File": "/var/www/html/apps/suspicious_login/vendor/rubix/ml/src/Specifications/DatasetHasDimensionality.php",
      "Line": 64

Mail app version

1.11.7

Mailserver or service

mx.nc.c

Operating system

Ubuntu

PHP engine version

PHP 7.4

Web server

Apache (supported)

Database

MariaDB

Additional info

suspicious_login: 4.1.0

+1. I have exactly the same issue with same logs on Nextcloud 24.0.2 on Linux (plain install). @nickvergessen , did you solve it and if so, how? Thank you

I'm not into the mail code, so I don't plan to look into it. Currently I'm just ignoring those errors