Access violation in TOracleSession.Logoff under Oracle 8 (mixed ThreadSafe sessions)

[Raoul]

Dear all,

I have a pretty strange problem...

We have an access violation in ntdll.dll (Access violation at address 7C921899. Read of address BAADF01D).

It happens when TOracleSession.LogOff is doing the OCIHandleFree(authp, OCI_HTYPE_SESSION)

Now, the strange things are :

- The AV happens with the Oracle Client 8.1.7.4 regardless of the server version.

- The AV does *not* happen with Oracle client 9.2

- We have two TOracleSessions. The first one is not ThreadSafe, because all queries are executed from the main thread (and I am pretty sure of this). The second session is ThreadSafe because it is used from both the main thread and a secondary thread. In this configuration we the AV. Now,

- The AV does *not* happen when *both* sessions are ThreadSafe.

- The AV does *not* happen when *none* of the session is ThreadSafe.

I'm slowly beginning to suspect a bug in the Oracle 8.1.7 client when mixing ThreadSafe and not ThreadSafe sessions. Would you have any light on this ?

Thanks a lot...

--- Raoul

 

[Raoul]

Forgot to say that DOA version is latest 4.0.7.1.

Sorry.

 

[Marco Kalter]

I have no specific information, but I agree that it seems like an 8.1.7 client bug. Enabling ThreadSafe for both sessions seems the appropriate workaround.

 

[Devil]

try use BreakExecute before LogOff