Memory leak in newer versions

[ryan-adler]

Until recently, we were running the smtp4dev container without any issues on version linux-amd64-3.2.0-ci20221023104. We have moved to a newer container with the latest tag (3.6.0+32d49cac3a0c67e55228cd39ca66d3b552afa7d6), and we see a constant increase in memory usage until we get OutOfMemoryExceptions.

System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
   at Microsoft.Data.Sqlite.SqliteValueReader.GetBlob(Int32 ordinal)
   at Microsoft.Data.Sqlite.SqliteValueReader.GetFieldValue[T](Int32 ordinal)
   at lambda_method110(Closure, QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator)
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Rnwood.Smtp4dev.Controllers.MessagesController.GetSummaries(String searchTerms, String mailboxName, String sortColumn, Boolean sortIsDescending, Int32 page, Int32 pageSize) in /home/vsts/work/1/s/Rnwood.Smtp4dev/Controllers/MessagesController.cs:line 81
   at lambda_method98(Closure, Object, Object[])
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerAct

[rnwood]

Thanks for reporting this.

Are you running with DB as a file (the default) as in memory? What kind of volume of sessions/messages before you are hitting this?

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From: ryan-adler @.> Sent: Wednesday, May 15, 2024 7:45:39 AM To: rnwood/smtp4dev @.> Cc: Subscribed @.***> Subject: [rnwood/smtp4dev] Memory leak in newer versions (Issue #1479)

Until recently, we were running the smtp4dev container without any issues on version linux-amd64-3.2.0-ci20221023104. We have moved to a newer container with the latest tag, and we see a constant increase in memory usage until we get OutOfMemoryExceptions.

System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown. at Microsoft.Data.Sqlite.SqliteValueReader.GetBlob(Int32 ordinal) at Microsoft.Data.Sqlite.SqliteValueReader.GetFieldValue[T](Int32 ordinal) at lambda_method110(Closure, QueryContext, DbDataReader, ResultContext, SingleQueryResultCoordinator) at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable1.Enumerator.MoveNext() at System.Collections.Generic.List1..ctor(IEnumerable1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source) at Rnwood.Smtp4dev.Controllers.MessagesController.GetSummaries(String searchTerms, String mailboxName, String sortColumn, Boolean sortIsDescending, Int32 page, Int32 pageSize) in /home/vsts/work/1/s/Rnwood.Smtp4dev/Controllers/MessagesController.cs:line 81 at lambda_method98(Closure, Object, Object[]) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerAct

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[ryan-adler]

It is running from the container, with basically default settings, except for enabling StartTls, NumberOfMessageToKeep at 5000,, setting the hostname, port, and locking settings. So I guess the DB is using the default file mode. I would guess around 500-1000 mails is the expected volume. I can give a more accurate estimate tomorrow after our test suites have run against the old container and I can look at the history there.

[rnwood]

Please can you confirm if this is reproducable for you with >= 3.6.1.

I'm not able to reproduce this with 3.6.0, however the stress testing script I have and settings may not match yours. In particular, mine currently sends a large number of messages per session.

[ryan-adler]

Please give us some time - we need to have the devs move tests to the new API before we can fully test. I'll let you know as soon as possible.