2 email rifiutate da 2026.4.0-latest ( 5f0d95e1f1 )

Ethsim2 · 7 Aprile 2026, 8:37pm

Ciao, sto riscontrando un errore intermittente nell’elaborazione delle email in arrivo su un sito self-hosted che utilizza mail-receiver.

Cosa è successo

Due email in arrivo separate:

sono state consegnate all’indirizzo Discourse corretto
appaiono in /admin/email/received
appaiono anche in /admin/email/rejected
mostrano il messaggio di rifiuto generico: “Si è verificato un errore non riconosciuto durante l’elaborazione della tua email e non è stata pubblicata.”

All’incirca nello stesso periodo, i log hanno mostrato ActiveRecord::Deadlocked.

Perché penso che possa essere un bug

Ho confrontato le email rifiutate con una successiva email riuscita di formato molto simile:

stesso pattern del mittente
stesso percorso Microsoft / Power Automate
stesso formato visibile del campo To:
stesso destinatario SMTP della busta per l’indirizzo Discourse

Quindi non sembra trattarsi di un semplice problema di configurazione con mail-receiver.

Prove

Per entrambe le email rifiutate:

si trattava di consegne separate con diversi Message-ID
avevano diversi ID di coda Postfix
entrambe sono state consegnate for <ppyem3.accomodation@discourse.domain.com>

Ho inoltre osservato ActiveRecord::Deadlocked nei log nello stesso periodo.

Contesto di hosting

self-hosted
utilizzo di mail-receiver
piccolo VPS IONOS
1 worker web configurato

Mi rendo conto che il singolo worker web potrebbe essere solo un contesto di background e non la causa, dato che questo sembra riguardare l’elaborazione di email in arrivo/background piuttosto che la gestione delle richieste web.

Se utile, posso fornire:

intestazioni anonimizzate per le 2 email rifiutate
intestazioni anonimizzate per un’email comparabile riuscita
la voce di log del deadlock

Ethsim2 · 7 Aprile 2026, 9:12pm

browsing the /logs endpoint, i see the two errors

env

hostname	ubuntu-app
process_id	2297
application_version	5f0d95e1f11a9cb5acbe8c7a61142400fc506f06
job	Jobs::ProcessEmail
db	default
time	7:48 pm

backtrace

activesupport-8.0.5/lib/active_support/broadcast_logger.rb:218:in 'block in ActiveSupport::BroadcastLogger#dispatch' 
activesupport-8.0.5/lib/active_support/broadcast_logger.rb:217:in 'Array#map' 
activesupport-8.0.5/lib/active_support/broadcast_logger.rb:217:in 'ActiveSupport::BroadcastLogger#dispatch' 
activesupport-8.0.5/lib/active_support/broadcast_logger.rb:129:in 'ActiveSupport::BroadcastLogger#error' 
/var/www/discourse/lib/email/processor.rb:126:in 'Email::Processor#handle_failure' 
/var/www/discourse/lib/email/processor.rb:31:in 'Email::Processor#process!' 
/var/www/discourse/lib/email/processor.rb:13:in 'Email::Processor.process!' 
/var/www/discourse/app/jobs/regular/process_email.rb:8:in 'Jobs::ProcessEmail#execute' 
/var/www/discourse/app/jobs/base.rb:318:in 'block (2 levels) in Jobs::Base#perform' 
rails_multisite-7.0.0/lib/rails_multisite/connection_management/null_instance.rb:49:in 'RailsMultisite::ConnectionManagement::NullInstance#with_connection'
rails_multisite-7.0.0/lib/rails_multisite/connection_management.rb:17:in 'RailsMultisite::ConnectionManagement.with_connection'
/var/www/discourse/app/jobs/base.rb:305:in 'block in Jobs::Base#perform' 
/var/www/discourse/app/jobs/base.rb:301:in 'Array#each' 
/var/www/discourse/app/jobs/base.rb:301:in 'Jobs::Base#perform' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:220:in 'Sidekiq::Processor#execute_job' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:185:in 'block (4 levels) in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:180:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
/var/www/discourse/lib/sidekiq/suppress_user_email_errors.rb:6:in 'Sidekiq::SuppressUserEmailErrors#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
/var/www/discourse/lib/sidekiq/discourse_event.rb:6:in 'Sidekiq::DiscourseEvent#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
/var/www/discourse/lib/sidekiq/pausable.rb:131:in 'Sidekiq::Pausable#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/job/interrupt_handler.rb:9:in 'Sidekiq::Job::InterruptHandler#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/metrics/tracking.rb:26:in 'Sidekiq::Metrics::ExecutionTracker#track' 
sidekiq-7.3.10/lib/sidekiq/metrics/tracking.rb:134:in 'Sidekiq::Metrics::Middleware#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:173:in 'Sidekiq::Middleware::Chain#invoke' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:184:in 'block (3 levels) in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:145:in 'block (6 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_retry.rb:118:in 'Sidekiq::JobRetry#local' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:144:in 'block (5 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/config.rb:39:in 'block in <class:Config>' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:139:in 'block (4 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:281:in 'Sidekiq::Processor#stats' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:134:in 'block (3 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_logger.rb:15:in 'Sidekiq::JobLogger#call' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:133:in 'block (2 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_retry.rb:85:in 'Sidekiq::JobRetry#global' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:132:in 'block in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_logger.rb:40:in 'Sidekiq::JobLogger#prepare' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:131:in 'Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:183:in 'block (2 levels) in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:182:in 'Thread.handle_interrupt' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:182:in 'block in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:181:in 'Thread.handle_interrupt' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:181:in 'Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:86:in 'Sidekiq::Processor#process_one' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:76:in 'Sidekiq::Processor#run' 
sidekiq-7.3.10/lib/sidekiq/component.rb:10:in 'Sidekiq::Component#watchdog' 
sidekiq-7.3.10/lib/sidekiq/component.rb:19:in 'block in Sidekiq::Component#safe_thread'

info

Unrecognized error type (ActiveRecord::Deadlocked: PG::TRDeadlockDetected: ERROR:  deadlock detected
DETAIL:  Process 1170676 waits for ShareLock on transaction 3318694; blocked by process 1169876.
Process 1169876 waits for ExclusiveLock on tuple (4,27) of relation 74547 of database 16384; blocked by process 1170546.
Process 1170546 waits for ShareLock on transaction 3318690; blocked by process 1170676.
HINT:  See server log for query details.
CONTEXT:  while updating tuple (1,54) in relation "user_stats"
) when processing incoming email

Backtrace:
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/patches/db/pg/alias_method.rb:109:in 'PG::Connection#exec'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/patches/db/pg/alias_method.rb:109:in 'PG::Connection#async_exec'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/postgresql/database_statements.rb:167:in 'ActiveRecord::ConnectionAdapters::PostgreSQL::DatabaseStatements#perform_query'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/abstract/database_statements.rb:556:in 'block (2 levels) in ActiveRecord::ConnectionAdapters::DatabaseStatements#raw_execute'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/abstract_adapter.rb:1022:in 'block in ActiveRecord::ConnectionAdapters::AbstractAdapter#with_raw_connection'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5/lib/active_support/concurrency/null_lock.rb:9:in 'ActiveSupport::Concurrency::NullLock#synchronize'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/abstract_adapter.rb:991:in 'ActiveRecord::ConnectionAdapters::AbstractAdapter#with_raw_connection'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_ad...

env

hostname	ubuntu-app
process_id	2297
application_version	5f0d95e1f11a9cb5acbe8c7a61142400fc506f06
job	Jobs::ProcessEmail
db	default
time	7:48 pm

backtrace

activesupport-8.0.5/lib/active_support/broadcast_logger.rb:218:in 'block in ActiveSupport::BroadcastLogger#dispatch' 
activesupport-8.0.5/lib/active_support/broadcast_logger.rb:217:in 'Array#map' 
activesupport-8.0.5/lib/active_support/broadcast_logger.rb:217:in 'ActiveSupport::BroadcastLogger#dispatch' 
activesupport-8.0.5/lib/active_support/broadcast_logger.rb:129:in 'ActiveSupport::BroadcastLogger#error' 
/var/www/discourse/lib/email/processor.rb:126:in 'Email::Processor#handle_failure' 
/var/www/discourse/lib/email/processor.rb:31:in 'Email::Processor#process!' 
/var/www/discourse/lib/email/processor.rb:13:in 'Email::Processor.process!' 
/var/www/discourse/app/jobs/regular/process_email.rb:8:in 'Jobs::ProcessEmail#execute' 
/var/www/discourse/app/jobs/base.rb:318:in 'block (2 levels) in Jobs::Base#perform' 
rails_multisite-7.0.0/lib/rails_multisite/connection_management/null_instance.rb:49:in 'RailsMultisite::ConnectionManagement::NullInstance#with_connection'
rails_multisite-7.0.0/lib/rails_multisite/connection_management.rb:17:in 'RailsMultisite::ConnectionManagement.with_connection'
/var/www/discourse/app/jobs/base.rb:305:in 'block in Jobs::Base#perform' 
/var/www/discourse/app/jobs/base.rb:301:in 'Array#each' 
/var/www/discourse/app/jobs/base.rb:301:in 'Jobs::Base#perform' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:220:in 'Sidekiq::Processor#execute_job' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:185:in 'block (4 levels) in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:180:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
/var/www/discourse/lib/sidekiq/suppress_user_email_errors.rb:6:in 'Sidekiq::SuppressUserEmailErrors#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
/var/www/discourse/lib/sidekiq/discourse_event.rb:6:in 'Sidekiq::DiscourseEvent#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
/var/www/discourse/lib/sidekiq/pausable.rb:131:in 'Sidekiq::Pausable#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/job/interrupt_handler.rb:9:in 'Sidekiq::Job::InterruptHandler#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:183:in 'block in Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/metrics/tracking.rb:26:in 'Sidekiq::Metrics::ExecutionTracker#track' 
sidekiq-7.3.10/lib/sidekiq/metrics/tracking.rb:134:in 'Sidekiq::Metrics::Middleware#call' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:182:in 'Sidekiq::Middleware::Chain#traverse' 
sidekiq-7.3.10/lib/sidekiq/middleware/chain.rb:173:in 'Sidekiq::Middleware::Chain#invoke' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:184:in 'block (3 levels) in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:145:in 'block (6 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_retry.rb:118:in 'Sidekiq::JobRetry#local' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:144:in 'block (5 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/config.rb:39:in 'block in <class:Config>' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:139:in 'block (4 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:281:in 'Sidekiq::Processor#stats' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:134:in 'block (3 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_logger.rb:15:in 'Sidekiq::JobLogger#call' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:133:in 'block (2 levels) in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_retry.rb:85:in 'Sidekiq::JobRetry#global' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:132:in 'block in Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/job_logger.rb:40:in 'Sidekiq::JobLogger#prepare' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:131:in 'Sidekiq::Processor#dispatch' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:183:in 'block (2 levels) in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:182:in 'Thread.handle_interrupt' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:182:in 'block in Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:181:in 'Thread.handle_interrupt' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:181:in 'Sidekiq::Processor#process' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:86:in 'Sidekiq::Processor#process_one' 
sidekiq-7.3.10/lib/sidekiq/processor.rb:76:in 'Sidekiq::Processor#run' 
sidekiq-7.3.10/lib/sidekiq/component.rb:10:in 'Sidekiq::Component#watchdog' 
sidekiq-7.3.10/lib/sidekiq/component.rb:19:in 'block in Sidekiq::Component#safe_thread'

info

Unrecognized error type (ActiveRecord::Deadlocked: PG::TRDeadlockDetected: ERROR:  deadlock detected
DETAIL:  Process 1170678 waits for ShareLock on transaction 3318690; blocked by process 1170676.
Process 1170676 waits for ShareLock on transaction 3318694; blocked by process 1169876.
Process 1169876 waits for ExclusiveLock on tuple (4,27) of relation 74547 of database 16384; blocked by process 1170678.
HINT:  See server log for query details.
CONTEXT:  while locking tuple (4,27) in relation "categories"
) when processing incoming email

Backtrace:
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/patches/db/pg/alias_method.rb:109:in 'PG::Connection#exec'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/patches/db/pg/alias_method.rb:109:in 'PG::Connection#async_exec'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/postgresql/database_statements.rb:167:in 'ActiveRecord::ConnectionAdapters::PostgreSQL::DatabaseStatements#perform_query'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/abstract/database_statements.rb:556:in 'block (2 levels) in ActiveRecord::ConnectionAdapters::DatabaseStatements#raw_execute'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/abstract_adapter.rb:1022:in 'block in ActiveRecord::ConnectionAdapters::AbstractAdapter#with_raw_connection'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activesupport-8.0.5/lib/active_support/concurrency/null_lock.rb:9:in 'ActiveSupport::Concurrency::NullLock#synchronize'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_adapters/abstract_adapter.rb:991:in 'ActiveRecord::ConnectionAdapters::AbstractAdapter#with_raw_connection'
  /var/www/discourse/vendor/bundle/ruby/3.4.0/gems/activerecord-8.0.5/lib/active_record/connection_ada...

Ethsim2 · 7 Aprile 2026, 9:37pm

Ciao, grazie per aver dato un’occhiata. Voglio assicurarmi di raccogliere i giusti dati aggiuntivi prima di eseguire operazioni rumorose sul server.

In base al deadlock e a come viene eseguito Jobs::ProcessEmail, penso che quanto segue possa aiutare a restringere il campo, ma gradirei una conferma prima di procedere.

1. Confronto degli intestazioni email (fallita vs riuscita)

Posso estrarre e pubblicare le intestazioni grezze oscurate da:

/admin/email/received → “Mostra originale”

Per:

1 email fallita

oppure entrambe come da

1 email riuscita con lo stesso pattern

come da

Questo includerebbe:

Message-ID
From
To
Delivered-To
Return-Path
le righe superiori di Received:

Sarebbe utile questo confronto?

2. Esito del job Sidekiq (retry / dead set)

Dato che ciò sta accadendo all’interno di Jobs::ProcessEmail, posso verificare se i job:

sono stati riprovati
hanno infine avuto successo
o sono finiti nel dead set

Utilizzando:

./launcher enter app
rails c
Sidekiq::RetrySet.new.select { |j| j.klass == "Jobs::ProcessEmail" }
Sidekiq::DeadSet.new.select { |j| j.klass == "Jobs::ProcessEmail" }

Confermare il comportamento di retry/dead-set aiuterebbe a diagnosticare il problema?

Configurazione della concorrenza

Ho menzionato di essere in esecuzione con 1 worker web, ma mi rendo conto che la concorrenza di Sidekiq è probabilmente più rilevante per un deadlock.

Posso condividere i valori pertinenti da app.yml, ad esempio:

UNICORN_WORKERS:
SIDEKIQ_CONCURRENCY:

Al momento, non ho impostato esplicitamente SIDEKIQ_CONCURRENCY in app.yml, quindi credo che sia in esecuzione con la concorrenza predefinita (cioè più thread Sidekiq).

Sarebbe un contesto importante per interpretare il deadlock?

Versione di PostgreSQL

Dato che si tratta di un PG::TRDeadlockDetected, posso anche confermare la versione esatta di PostgreSQL in uso.

Vale la pena includerla?

Tempistica delle email in arrivo

Ho osservato che le due email fallite sono state elaborate a brevissima distanza temporale (stesso minuto).

Posso estrarre tempistiche più precise dai log se utile.

Una correlazione temporale più stretta aiuterebbe a confermare se si tratta di un problema attivato dalla concorrenza?

Se utile, posso raccogliere e pubblicare tutto quanto sopra in un follow-up; volevo solo verificare cosa sarebbe stato più utile per prima cosa.

Grazie ancora

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