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moozzyk / EFCache

Second Level Cache for Entity Framework 6.1

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NullReferenceException in CachingCommand.Dispose(Boolean)

icnocop opened this issue · comments

commented

Hi.

A NullReferenceException may be thrown in EFCache.CachingCommand.Dispose(Boolean) if an an OutOfMemoryException is previously thrown (in EFCache.CachingCommandDefinition.CreateCommand() for example).

This caused my application to crash.

First exception:

System.OutOfMemoryException
   at System.Object.MemberwiseClone()
   at System.Array.Clone()
   at System.Data.SqlClient.SqlParameter..ctor(SqlParameter source)
   at System.Data.SqlClient.SqlParameter.System.ICloneable.Clone()
   at System.Data.Entity.SqlServer.SqlProviderServices.CloneDbCommand(DbCommand fromDbCommand)
   at System.Data.Entity.Core.Common.DbCommandDefinition.CreateCommand()
   at EFCache.CachingCommandDefinition.CreateCommand()
   at System.Data.Entity.Core.Common.DbProviderServices.CreateCommand(DbCommandTree commandTree, DbInterceptionContext interceptionContext)
   at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
   at System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(Dictionary`2 identifierValues)
   at System.Data.Entity.Core.Mapping.Update.Internal.DynamicUpdateCommand.Execute(Dictionary`2 identifierValues, List`1 generatedValues)
   at System.Data.Entity.Core.Mapping.Update.Internal.UpdateTranslator.Update()
   at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.<Update>b__2(UpdateTranslator ut)
   at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update[T](T noChangesResult, Func`2 updateFunction)
   at System.Data.Entity.Core.EntityClient.Internal.EntityAdapter.Update()
   at System.Data.Entity.Core.Objects.ObjectContext.<SaveChangesToStore>b__35()
   at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
   at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
   at System.Data.Entity.Core.Objects.ObjectContext.<>c__DisplayClass2a.<SaveChangesInternal>b__27()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal(SaveOptions options, Boolean executeInExistingTransaction)
   at System.Data.Entity.Core.Objects.ObjectContext.SaveChanges(SaveOptions options)
   at System.Data.Entity.Internal.InternalContext.SaveChanges()
   at System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
   at MyApplication.MyCodeFirstDatabase.Model.MyDatabaseContext.SaveChanges()

Second exception:

Description: The process was terminated due to an unhandled exception.
Exception Info: System.NullReferenceException
   at EFCache.CachingCommand.Dispose(Boolean)
   at System.ComponentModel.Component.Finalize()

Thank you.

commented

Nice stress testing. I would love to know which part is actually null  😀

commented

Seems that the object was created but the _command was not yet initialized when the OutOfMemory exception was thrown.