A fix is available
APAR status
Closed as program error.
Error description
abd 5c6 and CSQX206E caused by the XA client sending an invalid sequence of flows. The client is sending: xa_end() with TMFAIL followed by: xa_end() with TMSUCCESS This is invalid (for the same XID) as after the TMFAIL, the specification states that this: "dissociates caller and marks transaction branch rollback-only" However, despite this combination being invalid, MQ is not handling the exception in a graceful manner and that is why the abend is occurring.
Local fix
investigate the client application to determine the incorrect sequence of xa calls
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 * * Release 1 Modification 0 * **************************************************************** * PROBLEM DESCRIPTION: Issuing multiple XA_END calls for the * * same MQ XA transaction with the * * CSQSERVICE1 flag set, results in abend * * 5C6-00940001 in CSQMCPRH. * **************************************************************** * RECOMMENDATION: * **************************************************************** With CSQSERVICE1, XA transactions can be prepared on a different client connection. However with this, when a XA_END call is made sucessfully, subsequent XA_END calls for the same XID result in abend 5C6-00940001 in CSQMCPRH, as the logic cannot find an XTE associated with the connection ACE. This also results in the subsequent XA_END calls for the XID failing unexpectedly with XAER_RMERR (-3).
Problem conclusion
XA_END processing has been altered, to correctly handle the case where there is no associated XTE, and ensure the correct reason code, XAER_PROTO is returned on the subsequent XA_END call. In this case the QMGR should no longer abend. 100Y CSQMCPRH
Temporary fix
Comments
APAR Information
APAR number
PI89764
Reported component name
WMQ Z/OS V7
Reported component ID
5655R3600
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-11-06
Closed date
2017-11-30
Last modified date
2018-01-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Modules/Macros
CSQMCPRH
Fix information
Fixed component name
WMQ Z/OS V7
Fixed component ID
5655R3600
Applicable component levels
R100 PSY UI52283
UP17/12/19 P F712
Fix is available
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Document Information
Modified date:
03 January 2018