BUG: Updating Mail App exceeds Workers + CPU and terminates Nextcloud Service #13695

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1. SchwarzeLanze

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   bug

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   on Sep 16, 2026
2. SchwarzeLanze

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   Bug

   issue type on Sep 16, 2026
3. kesselb commented on Sep 21, 2026

   

   kesselb

   on Sep 21, 2026

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   Hey, thanks for reporting an issue when updating the app.

   I assume you did update from 5.11.x to 5.12.0. That upgrade will run some migrations to alter the database. These are:

   • Version5012Date20260604000000: adds the boolean column ai_generated to mail_local_messages (drafts and outbox, so a handful of rows per user).
   • Version5012Date20260816120000: adds the column master_user to mail_provisionings (one row per provisioning config).
   • Version5120Date20260901000000: replaces the unique index on mail_internal_address with one over (user_id, address). The table only holds addresses users added to their internal-address list.
   • Version5120Date20260820000000: only if you came from 5.11.5 or older; it rewrites four app config values to typed booleans. No schema change.

   None of these touch the big tables (mail_messages, mail_recipients), so I don't see where minutes of CPU or a pile of workers would come from here.

   What runs on every app update, regardless of version, are our repair steps.

   AddMissingDefaultTags for instance walks every mail account on the instance. If your instance has a lot of accounts, that is the more likely candidate.

   Could you share:

   • the exact version you updated from,
   • the output of occ app:update mail (or the updater log), it prints each migration and repair step, so we can see which one hangs,
   • roughly how many mail accounts are configured (select count(*) from oc_mail_accounts;),
   • what exactly "exceeds workers" means, is that php-fpm running out of children while the web updater holds a request open?
4. kesselb

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   needs info

   on Sep 21, 2026
5. kesselb

   self-assigned this

   on Sep 28, 2026