A fix is available
APAR status
Closed as unreproducible in next release.
Error description
There is a session coming down between an application and a Telnet LU. VTAM receives an UNBIND and tries to update the RAP_TN_FMCB field with an FMCB Pointer. However VTAM is no longer pointing to the RAP but is pointing into the module ISTCPCTI and overlaying code with an FMCB pointer. In this case the overlay is in ISTCPCIT. Later ISTCPCIT abends.
Local fix
Code NOSHAREACB or let it default to NOSHAREACB in the TELNET profile.
Problem summary
**************************************************************** * USERS AFFECTED: All users coding SHAREACB in their * * Telnet profile. * **************************************************************** * PROBLEM DESCRIPTION: ABEND0C6 in ISTCPCIT * * ABEND0C4 in ISTTSCWU * **************************************************************** * RECOMMENDATION: * **************************************************************** The problem may be summarized as follows: 1. SHAREACB is coded in the Telnet profile 2. There is a subarea connection between the VTAM where Telnet resides and the VTAM where the PLU application resides. 3. A Telnet client requests a session with the PLU application. 4. Later, when the session goes down, a timing condition occurs that causes the RDTE to not be found and therefore not updated. 5. After not finding the RDTE, the RDTE will still point to an FMCB. Also, some storage will be overwritten. 6. If the storage overwritten is a module such as ISTCPCIT, it may abend the next time it runs. 7. Later, when VTAM is shut down with Z NET,QUICK, ABEND0C4 in ISTTSCWU may occur.
Problem conclusion
Temporary fix
********* * HIPER * *********
Comments
AMREQST and ISTAMPL are updated to allow RDTE to be specified on the AMRELESE macro. ISTAMCFR is updated to handle an RDTE specified on AMRELESE. ISTLUCSC is updated to SRTADD a low order element address for a Telnet Shareacb session. ISTSDCLR is updated to AMRELESE the low order element address added by ISTLUCSC.
APAR Information
APAR number
OA42322
Reported component name
VTAM V4 MVS/ESA
Reported component ID
569511701
Reported release
1C0
Status
CLOSED UR1
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2013-05-21
Closed date
2013-06-07
Last modified date
2013-08-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA69447 UA69448
Modules/Macros
AMREQST ISTAMCFR ISTAMPL ISTLUCSC ISTRAP ISTSDCLR
Fix information
Fixed component name
VTAM V4 MVS/ESA
Fixed component ID
569511701
Applicable component levels
Fix is available
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Document Information
Modified date:
02 August 2013