A fix is available
APAR status
Closed as program error.
Error description
rfxMatchQuery function would allocate storage to hold a list of subscription pointers, and would return that list to its caller. It is the responsibility of the calling function to ensure that the storage is freed when finished with. Most callers of rfxMatchQuery have appropriate logic to ensure that the storage is freed. However, a new function, rrmCheckSubs (first added at V904), doesn't free the subscription list. rrmCheckSubs is called repeatedly during cluster maintenance, which runs every hour. On a partial repository, it will be called once for each live object in the cluster cache, leaking x1A8 bytes each time it is called. Over time, these leaked control blocks result in storage fragmentation, increasing the CPU cost of all storage getmains in the chinit.
Local fix
na
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Storage leak of x1A8 long blocks * * during cluster maintenance. * **************************************************************** During cluster maintenance blocks of storage of length x1A8 bytes are allocated to hold a list of subscription pointers, however function rrmCheckSubs does not free them after use. Over time, these leaked control blocks result in storage fragmentation, increasing the CPU cost of all storage getmains in the chinit.
Problem conclusion
Function rrmCheckSubs has been updated to free the subscription pointer storage blocks after use.
Temporary fix
Comments
APAR Information
APAR number
PH17229
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-09-23
Closed date
2020-04-20
Last modified date
2020-06-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI69086
Modules/Macros
CMQXRMNT
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI69086
UP20/05/28 P F005
Fix is available
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Document Information
Modified date:
02 June 2020