PQ71402: ABEND0A9 IN ISTTSCSX DUE TO ZEROS IN CSM TOKEN PROVIDED BY TCPIP

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible.

Error description

• ABEND0A9 in ISTTSCSX occurred when TCPIP passed an XBUFLIST
  to VTAM that contained zeros in a CSM Token field.  The data
  was for EE and a packet had been fragmented.  Two fragments
  were received together in a packed message.  When TCPIP created
  the xbuflist a correct CSM Token was used for the first fragment
  but a CSM Token of zeros was used for the second.
  ( MV24109 )
  Verification Steps:
  Additional Symptoms:
  ABEND0A9 ISTTSCSH RCFF13 FF13
  Sense code 10100000
  

Local fix

• KEYWORDS: ABEND 0A9 ABEND0A9 CSM TOKEN ZEROS XBUFLIST ISTTSCSX
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the Communications Server for   *
  *                 OS/390 Release 10 IP and z/OS Version 1      *
  *                 Release 2:  Enterprise Extender              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Enterprise Extender inbound data causes *
  *                      an abend0A9 in ISTTSCSX due to an CSM   *
  *                      buffer token that is zeros.             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Enterprise Extender inbound data processing clears the CSM token
  when processing a packet that is not in a packing buffer.  When
  a fragmented packet arrives there may be more than one reference
  to the same CMS buffer.  Clearing the CSM token when the first
  packet is processed causes an abend0A9 in ISTTSCSX when the
  subsequent packets are forwarded to VTAM.
  This problem was identified and corrected in z/OS Version 1
  Release 4 IP under PTR MV24109.
  +-------------------------------------------------------------+
  + Please check our Communications Server for OS/390 homepages +
  + for common networking tips and fixes.  The URL for these    +
  + homepages can be found in Informational APAR II11334.       +
  +-------------------------------------------------------------+
  

Problem conclusion

Temporary fix

Comments

• EZBUDBYP has been amended to not clear the CSM token when the
  SKDB has a reference count greater than 1.
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UQ74952 UQ74953

Modules/Macros

• EZBUDBYP
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R120 PSY UQ74952

     UP03/04/12 P F304

• R50A PSY UQ74953

     UP03/04/12 P F304

Fix is available

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