Random crash: NullReferenceException and invalid database handle (crashing
application available)
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Key: DNET-727
URL: http://tracker.firebirdsql.org/browse/DNET-727
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 5.7.0.0, 5.6.0.0, 5.5.0.0, 5.1.1.0, 5.1.0.0, 5.0.5.0,
5.0.0.0, 4.10.0.0, 4.9.0.0
Environment: Windows 10, desktop
Reporter: Eric Bole-Feysot
Assignee: Jiri Cincura
Priority: Blocker
Hi
I would like to report some random crash I met since v4.8.1 on
FirebirdSql.Data.Client. It happens randomly so it is not easy to reproduce.
One of my app user reported this bug some days ago and I took a new look at it.
I manage to modify my application to reproduce this bug (still random).
I tried with the latest 5.7.0 and it is still there.
System.NullReferenceException: Object reference not set to an instance of an
object.
at FirebirdSql.Data.FirebirdClient.FbCommand.Release() in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\FirebirdClient\FbCommand.cs:line
832
at FirebirdSql.Data.FirebirdClient.FbCommand.Dispose(Boolean disposing) in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\FirebirdClient\FbCommand.cs:line
376
at System.ComponentModel.Component.Finalize()
invalid database handle (no active connection)
at FirebirdSql.Data.Client.Native.FesDatabase.ProcessStatusVector(IntPtr[]
statusVector) in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\Client\Native\FesDatabase.cs:line
365
at FirebirdSql.Data.Client.Native.FesStatement.Free(Int32 option) in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\Client\Native\FesStatement.cs:line
621
at FirebirdSql.Data.Common.StatementBase.Release() in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\Common\StatementBase.cs:line
241
at FirebirdSql.Data.Client.Native.FesStatement.Release() in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\Client\Native\FesStatement.cs:line
246
at FirebirdSql.Data.Client.Native.FesStatement.Dispose(Boolean disposing) in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\Client\Native\FesStatement.cs:line
181
at FirebirdSql.Data.FirebirdClient.FbCommand.Release() in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\FirebirdClient\FbCommand.cs:line
838
at FirebirdSql.Data.FirebirdClient.FbCommand.Dispose(Boolean disposing) in
C:\Users\Jiri\Documents\devel\NETProvider\working\Provider\src\FirebirdSql.Data.FirebirdClient\FirebirdClient\FbCommand.cs:line
376
at System.ComponentModel.Component.Finalize()
I suppose both are related. It happens during the dispose of objects.
I got a compiled application (46 MB). Tell me if you want to give it a try and
I will upload it to my domain server.
Currently I'm stuck in v4.8.1 (in fact I did a v4.8.2 with a dirty hack to
catch the exception and I didn't see any side effect so far), but I would like
to catch up with the latest release.
Thanks for your work and I hope you will find a fix as it is very annoying.
Eric
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