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Received backend message ReadyForQuery while expecting ParseCompleteMessage.

See original GitHub issue

Steps to reproduce

not deterministic.

The issue

On reading and writing data, following exception is thrown: Npgsql.NpgsqlException (0x80004005): Received backend message ReadyForQuery while expecting ParseCompleteMessage. Please file a bug.

Exception Message:

Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details.
 ---> Npgsql.NpgsqlException (0x80004005): Received backend message ReadyForQuery while expecting ParseCompleteMessage. Please file a bug.

Stacktrace:

at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming, CancellationToken cancellationToken)
 at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
 at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
 at Npgsql.NpgsqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync(IRelationalConnection connection, CancellationToken cancellationToken)
 --- End of inner exception stack trace ---
 at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync(IRelationalConnection connection, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(IEnumerable`1 commandBatches, IRelationalConnection connection, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IList`1 entriesToSave, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(DbContext _, Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementationAsync[TState,TResult](Func`4 operation, Func`4 verifySucceeded, TState state, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementationAsync[TState,TResult](Func`4 operation, Func`4 verifySucceeded, TState state, CancellationToken cancellationToken)
 at Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)

Npgsql version: Npgsql.EntityFrameworkCore.PostgreSQL v 5.0.5.1 Postgres: AWS Aurora 9.6.16 Operating system: (Debian 10) k8s -> docker-image -> mcr.microsoft.com/dotnet/aspnet:5.0 -> buster-slim-amd64

Issue Analytics

State:
Created 2 years ago
Comments:11 (7 by maintainers)

Top GitHub Comments

1reaction

vonzshikcommented, May 21, 2021

@efmk it actually did help. I took a look not so long ago and found a potential bug with keepalive (npgsql/npgsql#3765). And your logs do confirm that it’s possible that’s the reason for your specific issue (as there is a race condition between connection closing and keepalive performing).

0reactions

rojicommented, Jul 26, 2021

Duplicate of https://github.com/npgsql/npgsql/issues/3765

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