Unhandled exception at 0x77256214 (ntdll.dll) in My.exe: 0xC0000374: A heap has been corrupted (para

fa7d0be5-37a8-4dcd-a2b3-4d6553a593a4

We are using Oracle.DataAccess.dll (ODP.NET) version 4.121.2.0 with System.Transactions (TransactionScope class). Somehow when System.Transacations invoke the callback method inside ODP.NET the process crashed with heap corrupted exception.

I asked the same question on .NET CoreFx repo https://github.com/dotnet/corefx/issues/39892

I have a long-running .NET console application (4.6.1). Suddenly since fews days I am getting this error in Visual Studio,

`Unhandled exception at 0x77256214 (ntdll.dll) in My.exe: 0xC0000374: A heap has been corrupted (parameters: 0x77272378).`

Pressing F5 again, it shows me another stuck and then stuck with the same error,

`Exception thrown at 0x771B234D (ntdll.dll) in My.exe: 0xC0000005: Access violation reading location 0x656C6573.`

I have global try catch which is not triggering in the console application. I have added,

`<legacyCorruptedStateExceptionsPolicy enabled="true" /> ` and `[HandleProcessCorruptedStateExceptionsAttribute]` but still application crashes without hitting the breakpoint. Then I tried WinDBG (`.loadby sos clr` then `!analyze -v` then `!CLRStack -a` then `!dumpstackobjects`),

```

OS Thread Id: 0x3da4 (0)

Child SP       IP Call Site

007cea38 771ac33c [GCFrame: 007cea38]

007cea54 771ac33c [HelperMethodFrame_1OBJ: 007cea54] System.Threading.Monitor.ReliableEnter(System.Object, Boolean ByRef)

007cead0 60f98710 System.Collections.Hashtable+SyncHashtable.Remove(System.Object) [f:\dd\ndp\clr\src\BCL\system\collections\hashtable.cs @ 1518]

007ceafc 0db7405f Oracle.DataAccess.Client.OracleResourcePool.RemoveResourceHolder(Oracle.DataAccess.Client.OracleResourceHolder)

007ceb28 0db73ffd Oracle.DataAccess.Client.OracleResourceHolder.Dispose()

007ceb34 0db7386f Oracle.DataAccess.Client.OracleResourceHolder.TransactionCompleted(System.Object, System.Transactions.TransactionEventArgs)

 

007ceb38 0086e053 [InlinedCallFrame: 007ceb38]

007cebb0 0086e053 [MulticastFrame: 007cebb0] System.Transactions.TransactionCompletedEventHandler.Invoke(System.Object, System.Transactions.TransactionEventArgs)

007cebdc 556cc0fb System.Transactions.InternalTransaction.FireCompletion()

007cebf0 556ea3f2 System.Transactions.TransactionStatePromotedAborted.EnterState(System.Transactions.InternalTransaction)

 

007cec08 556ed9c0 System.Transactions.TransactionStateDelegatedAborting.ChangeStatePromotedAborted(System.Transactions.InternalTransaction)

007cec14 556ee8ba System.Transactions.DurableEnlistmentDelegated.Aborted(System.Transactions.InternalEnlistment, System.Exception)

007cec24 556e34d6 System.Transactions.SinglePhaseEnlistment.Aborted()

007cec6c 0e36d662 Oracle.DataAccess.Client.PromotableTxnMgr.Rollback(System.Transactions.SinglePhaseEnlistment)

007cec90 556ed922 System.Transactions.TransactionStateDelegatedAborting.EnterState(System.Transactions.InternalTransaction)

007cecd4 556eb8f5 System.Transactions.TransactionStateDelegated.Rollback(System.Transactions.InternalTransaction, System.Exception)

007cece4 556c9c0a System.Transactions.Transaction.Rollback()

007ced18 556f0f43 System.Transactions.TransactionScope.InternalDispose()

007ced50 556f0da7 System.Transactions.TransactionScope.Dispose()

007cee04 0d49f9ae MyApp.Program.method()

```

Clearly, it's related to TransactionScope and Oracle but dunno why its crashing. For now I am just looking for a work around

Alex Keh-Oracle

I would recommend opening up a service request with Oracle Support: https://support.oracle.com/

You will then be able to share your debugger dump with Oracle. We can then take a look.