A fix is available
APAR status
Closed as program error.
Error description
The CSQFAMSM address space had already ended - this was due to being killed by with signal 9 SIGKILL (IEF450I CSQFAMSM CSQFAMSM - ABEND=SEC6 U0000 REASON=0000FF09), and so the ASCB stored in the queue manager was no longer valid. During queue manager shutdown CSQ0BSTP attempts to post the ECB in the AMSM address space using this ASCB, which fails with the abend 602 and captures the reported dump in this situation.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Following abnormal termination of the * * AMSM address space, the queue manager * * fails to terminate, resulting in * * various symptoms which can include: * * * * - 0D6 abends when applications call * * MQ and AMS services are required * * * * - Abend 602-00000000 during normal * * queue manager termination * **************************************************************** When AMS identifies with the queue manager, an incorrect termination ECB address is used. If AMS terminates abnormally, EOT processing posts this address, resulting in the AMS ASID value in the G0BL being overlaid. When CSQ0EOMC checks if a terminating TCB is from the AMSM address space, it incorrectly determines that the TCB is not, due to the overlaid value, and does not call CSQ0DEAD to terminate the queue manager. The queue manager does not expect to be running with AMS enabled but no longer running, resulting in unexpected behaviour.
Problem conclusion
The correct ECB address is passed during identify processing, preventing the overlay of the asid in the G0BL, and consequently allowing the queue manager to be terminated abnormally in the event of abnormal AMS termination.
Temporary fix
Comments
APAR Information
APAR number
PH18877
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-11-05
Closed date
2020-05-27
Last modified date
2020-09-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI69703
Modules/Macros
CSQ0DPCS CSQVATRM
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI69703
UP20/08/08 P F008 ¢
Fix is available
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Document Information
Modified date:
03 September 2020