PM49829: TN3270 ABENDS IN EZBITSCU(HIP61D0 11.090)+00116E S0C4/00000004 DUE TO BAD SKMBNEXT POINTER

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Telnet Server abends due to storage overlay.  The storage is in
  Telnet private.  Abends include
  EZBITSCU(HIP61D0 11.090)+00116E S0C4/00000004
  EZBTPTDP(HIP61D0 11.090)+0005C4 S0C4/00000010
  EZBTPLMI(HIP61D0 11.090)+00067E S0C1/00000001
  EZBSKDKI(HIP61D0 11.090)+000254 S4C5/74761102
  EZBTTSRV (HIP61D0 11.090) +000B6C S4C5/75D41102
  .
  EZBTTRCV issues a receive for a size greater than x'90', but
  uses a SKMB which only maps x'90' bytes of storage.  The receive
  will overlay the storage after the SKMB.
  Additional Search Keyword(s): kixdcfzos113
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the IBM Communications Server   *
  *                 for z/OS Version 1 Release(s) 13 IP: Telnet  *
  *                 Server                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Overlay causes multiple symptoms.       *
  *                      Known Abends in the following modules:  *
  *                      EZBITSCU, EZBTPTDP, EZBTPLMI, and       *
  *                      EZBSKDKI.                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem may be summarized as follows:
  1. Telnet has set up a session between a VTAM application and
     a Telnet client.
  2. Telnet receives data from the client and sends it on to VTAM.
  3. When the VTAM Send is posted, the buffer used for the
     first data is available for reuse.  However, the next data
     received from the Telnet client is larger than the allotted
     space in the buffer and an overlay occurs while
     reading the data from the client.
  4. The impact of the overlay is determined by what type of data
     gets overlaid.  We have seen the following abends:
    EZBITSCU(HIP61D0 11.090)+00116E S0C4/00000004
    EZBTPTDP(HIP61D0 11.090)+0005C4 S0C4/00000010
    EZBTPLMI(HIP61D0 11.090)+00067E S0C1/00000001
    EZBSKDKI(HIP61D0 11.090)+000254 S4C5/74761102
  +-------------------------------------------------------------+
  + 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

• EZBTTRCV is updated to ensure that it does not read more
  data into a buffer than the buffer can handle.
  
  EZBTTCCR included for maintenance purposes only.
  
  * Cross Reference between External and Internal Names
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UK72827

Modules/Macros

• EZBTTCCR EZBTTRCV
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R1D0 PSY UK72827

     UP11/12/08 P F112

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.