A Bug in EF SqlGenerator thread

This isn't the performance of multiple parallel queries on a single context.

This performance of several parallel queries on multiple contexts, but that a single application by the context:

When you query a DbContext we received the following exception:

The exception stack
  1. System.Data.Entity.Core.EntityCommandCompilationException: An error occurred during the development of the command definition. See the inner exception for more details. -> System.IndexOutOfRangeException: Index was outside the bounds of the array.

to System.Collections.Generic.List' 1. Add (T item)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.Visit (e DbScanExpression)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitJoinExpression (IList 1 entered, DbExpressionKind joinKind, String joinString, joinCondition DbExpression)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.Visit (e DbJoinExpression)

at Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitInputExpression (inputExpression, String inputVarName, inputVarType TypeUsage DbExpression object, symbol & fromSymbol)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitFilterExpression (entry DbExpressionBinding, DbExpression predicate, Boolean negatePredicate)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.Visit (e DbFilterExpression)

at Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitInputExpression (inputExpression, String inputVarName, inputVarType TypeUsage DbExpression object, symbol & fromSymbol)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.Visit (e DbProjectExpression)

at Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitExpressionEnsureSqlStatement (object e DbExpression, Boolean addDefaultColumns)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.Visit (e DbLimitExpression)

at Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitInputExpression (inputExpression, String inputVarName, inputVarType TypeUsage DbExpression object, symbol & fromSymbol)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.Visit (e DbProjectExpression)

at Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.VisitExpressionEnsureSqlStatement (object e DbExpression, Boolean addDefaultColumns)

to Oracle.ManagedDataAccess.EntityFramework.SqlGen.SqlGenerator.GenerateSql (tree DbQueryCommandTree, HashSet 1 & ListOfParamsToMakeUnicodeFalse)

at Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices.CreateCommand (EFOracleProviderManifest providerManifest, commandTree DbCommandTree)

to Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices.CreateDbCommandDefinition (DbProviderManifest, DbCommandTree commandTree providerManifest)

to System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition... ctor (DbProviderFactory storeProviderFactory DbCommandTree commandTree, DbInterceptionContext interceptionContext, IDbDependencyResolver resolver, BridgeDataReaderFactory bridgeDataReaderFactory, ColumnMapFactory columnMapFactory)

-End of the exception stack trace internal-

to System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition... ctor (DbProviderFactory storeProviderFactory DbCommandTree commandTree, DbInterceptionContext interceptionContext, IDbDependencyResolver resolver, BridgeDataReaderFactory bridgeDataReaderFactory, ColumnMapFactory columnMapFactory)

to System.Data.Entity.Core.EntityClient.Internal.EntityProviderServices.CreateDbCommandDefinition (DbProviderManifest, DbCommandTree commandTree, DbInterceptionContext interceptionContext providerManifest)

to System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlanFactory.CreateCommandDefinition (ObjectContext, DbQueryCommandTree tree object context)

at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlanFactory.Prepare (object context ObjectContext, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Boolean streaming, Span span, IEnumerable 1 compiledQueryParameters, AliasGenerator aliasGenerator)

to System.Data.Entity.Core.Objects.ELinq.ELinqQueryState.GetExecutionPlan (Nullable 1 forMergeOption)

to System.Data.Entity.Core.Objects.ObjectQuery'1. <>c__DisplayClass7. b__6() < GetResults >

to [T] System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction (func Func 1, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)

to System.Data.Entity.Core.Objects.ObjectQuery'1. <>c__DisplayClass7. b__5() < GetResults >

to System.Data.Entity.Core.Objects.ObjectQuery'1.GetResults (Nullable 1 forMergeOption)

to System.Data.Entity.Core.Objects.ObjectQuery'1. < < T > m. GetEnumerator > b__0()

to System.Data.Entity.Internal.LazyEnumerator'1.MoveNext)

to System.Linq.Enumerable.SingleOrDefault [TSource] (IEnumerable 1 source)

to System.Linq.Queryable.SingleOrDefault [TSource] (IQueryable 1 source, predicate Expression 1)

List < T >. Add may throw an exception if it is called at the same time (it can also work, and it can happen that one is lost... anything can happen when invoked in parallel) and in Visit (DbScanExpression) Add is called on a static list < string > without blocking.

So far, we have not written a scenario to test for it, it appeared once every 6 months (version 6.121.2.20141216).

Access to TargetOwner and TargetTable shouldn't be synchronized?

Bug 21570261 has been filed to track this issue.

Tags: Database

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