Red Alert - Potentially incorrect data for z/OS applications sending data using TCPIP ASYNCIO on z/OS 1.10

Here's a new Red Alert :

Abstract:
A logic error in z/OS 1.10 TCPIP can cause applications using ASYNCIO Writes to be driven twice. This can affect various applications and subsystems using z/OS TCPIP ASYNCIO on the sending side, such as Websphere MQ, JES and non-IBM products.

Description:
A logic error in TCPIP on z/OS 1.10 can cause applications using ASYNCIO Writes to be driven twice. The application data presented on the socket write operation is sent over the TCP connection twice, thus corrupting the data stream. This can affect various applications and subsystems using z/OS TCPIP ASYNCIO on the sending side, such as Websphere MQ, JES and non-IBM products. Please see APAR PK86842 for the details and symptoms that may result.

Recommended Actions:
z/OS 1.10 users should install the APAR fix for PK86842 that is currently available from IBM Support. z/OS releases prior to 1.10 are not affected.

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