A fix is available
APAR status
Closed as program error.
Error description
If AuxTrace is active and a transaction is purged there is a small window when CICS can go in wait. DFHTRSU issues message DFHTR0116 because of an AKEH abend. If the task is running on open TCB, have auxtrace active and to have just come out of an ECB WAIT for the I/O for the aux buffer when the transaction is purged. In this case the tracing of the return from DB2 was being issued from DFHD2D2 (on an L8 TCB), DFHTRPT issued the TRACE PUT call, and had acquired the trace lock. The bit indicating that the trace lock was held had been set and a call to DFHTRSU WRITE_AUX_BUFFER had been issued. This issues a DFHTRATM CHECK call which drives DFHTRAO and its DFHTRAO which issue the ECB wait. If at this point the transaction is purged then DFHTRSU's recovery routine is driven, which issues the DFHTR0116 message and sets the aux trace to paused, but it does not percolate back to DFHTRPT's recovery routine, which is where the trace lock would have been freed. The transaction should be protected from being purged whilst in the trace modules.
Local fix
n/a
Problem summary
**************************************************************** * USERS AFFECTED: All CICS Users. * **************************************************************** * PROBLEM DESCRIPTION: Following a purge of a CICS * * transaction, CICS region may enter * * wait. * **************************************************************** * RECOMMENDATION: * **************************************************************** Following a purge of a CICS transaction, the CICS region may go into a wait. This problem can occur when AUXTRACE is active and the CICS transaction has done a call to DB2. Should the purge of the CICS transaction happen to occur in the CICS code writing out the trace record then the CICS region will enter a wait and need to be restarted.
Problem conclusion
DFHD2D2 has been changed to protect the writing of trace records from being purgeable.
Temporary fix
********* * HIPER * ********* FIX AVAILABLE BY PTF ONLY
Comments
APAR Information
APAR number
PI62546
Reported component name
CICS TS Z/OS V5
Reported component ID
5655Y0400
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-05-17
Closed date
2016-07-21
Last modified date
2016-08-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI64045 UI39582 UI39583
Modules/Macros
DFHD2D2
Fix information
Fixed component name
CICS TS Z/OS V5
Fixed component ID
5655Y0400
Applicable component levels
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.
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Document Information
Modified date:
02 August 2016