PostgreSQL 25P02 in_failed_sql_transaction: aborted block

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

1. 1

   Locate the first SQLSTATE error that preceded 25P02 on the same session

   Tools required

   Who:

   You or your developer inspecting the application request trace or PostgreSQL server log.

   How:

   Filter the log by the backend process ID (PID), session ID, or request trace immediately before the first 25P02 entry, redacting any passwords, connection strings, or personal data before copying.

   Result that matters:

   The exact SQLSTATE code and error message of the statement that failed immediately before 25P02 began appearing.

   If an earlier statement on the same PID threw a constraint, syntax, permission, or lock error right before 25P02, that confirms the earlier statement is the true root cause to fix.

   If the very first statement of a new web request fails with 25P02 without a prior error in that request, that points to a pooled connection handed over while already in an aborted transaction block.

   Evidence to keep:

   Save the redacted log sequence showing both the initial error SQLSTATE and the subsequent 25P02 message on the same PID.

   Never ignore the initial error or suppress 25P02 in logs; always redact sensitive query literals before sharing log excerpts.

   Evidence: PostgreSQL 18 Appendix A: Error Codes · PostgreSQL 18 libpq connection status functions · PostgreSQL 18 transactions tutorial

2. 2

   Check pg_stat_activity for sessions stuck in idle in transaction (aborted)

   Tools required

   Who:

   Your DBA or developer with read access to pg_stat_activity.

   How:

   Run a read-only SELECT on pg_stat_activity filtering for state = 'idle in transaction (aborted)' to inspect pid, usename, application_name, xact_start, state_change, and query.

   Result that matters:

   Whether client backends are lingering in the aborted transaction state instead of rolling back promptly.

   If pg_stat_activity lists backends in state idle in transaction (aborted) for that application_name, that confirms client sessions are failing to issue ROLLBACK after query errors.

   If no backends remain in idle in transaction (aborted), that indicates the application eventually rolls back at request end after emitting one or more 25P02 errors mid-request.

   Evidence to keep:

   Record the pid, application_name, xact_start, state_change, and redacted query text from pg_stat_activity.

   Do not attempt to fix aborted transactions by killing server processes at the OS level; use only read-only catalog queries during diagnosis.

   Evidence: PostgreSQL ROLLBACK · PostgreSQL 18 cumulative statistics system

3. 3

   Review transaction state handling and SAVEPOINT usage in the client code

   No special tools

   Who:

   Your developer examining the data-access layer or ORM transaction block.

   How:

   Check whether the code expects to recover from an expected error inside a transaction block using SAVEPOINT and ROLLBACK TO, or whether it should abort the whole block with ROLLBACK.

   Result that matters:

   Whether every catch block inside a BEGIN ... COMMIT scope issues either ROLLBACK or ROLLBACK TO a valid savepoint defined before the failed command.

   If a catch block swallows an exception inside a transaction without calling ROLLBACK TO a prior savepoint, that confirms why PostgreSQL rejects the next query with 25P02.

   If the driver checks PQtransactionStatus and resets connections reporting PQTRANS_INERROR via ROLLBACK before reuse, that rules out pool state leakage.

   Evidence to keep:

   Keep the file and line numbers of the catch block and the connection pool reset configuration.

   Evidence: PostgreSQL ROLLBACK · PostgreSQL 18 libpq connection status functions · PostgreSQL 18 transactions tutorial

A code is meaningful only inside the right product and version context.

Appendix A lists 25P02 as in_failed_sql_transaction in Class 25, Invalid Transaction State. Once any SQL command errors inside a BEGIN ... COMMIT transaction block, PostgreSQL places that transaction block into an aborted state (reported by libpq as PQTRANS_INERROR and in pg_stat_activity as idle in transaction (aborted)) and rejects further commands until the session executes ROLLBACK or rolls back to a SAVEPOINT created before the failure. Code 25P02 is a follow-on symptom of an unhandled earlier error and never proves by itself that the statement currently returning 25P02 is invalid or that the database server is damaged.

• Mediumsource verified

  Never assume the SQL statement that returned 25P02 is the broken query; 25P02 only reports that the transaction block was already aborted by a prior command.

  Evidence: PostgreSQL 18 Appendix A: Error Codes · PostgreSQL 18 transactions tutorial

• Highsource verified

  Do not attempt to bypass transaction errors by disabling database constraints or triggers, and always issue ROLLBACK before starting a new unit of work on the same session.

  Evidence: PostgreSQL ROLLBACK · PostgreSQL 18 transactions tutorial

1. 1

   PostgreSQL 18 Appendix A: Error Codes

   PostgreSQL Global Development Group · 2026 · official_doc

2. 2

   PostgreSQL transaction isolation

   PostgreSQL Global Development Group · 2026 · official_doc

3. 3

   PostgreSQL ROLLBACK

   PostgreSQL Global Development Group · 2026 · official_doc