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MF60085 - LIC-LOOP WORKLOAD CAPPING FUNCTION HANGS SYSTEM

PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-LOOP WORKLOAD CAPPING FUNCTION HANGS SYSTEM


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
NONE



NOTICE:
-------
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REGARDING THE PTF.


APAR Error Description / Circumvention

-------------------------------------------------
Use of workload capping group function can hang
the system.

A spinlock protocol error in LIC workload capping group
support can hang the system in several scenarios:

o Create LIC workload capping group.
o Change maximum SMT level when LIC workload
capping group exists.
o Change processor multitasking mode when LIC
workload capping group exists.

Note that the operating system commands to manage
workload capping groups and their job associations
(e.g. ADDWLCGRP) provide for persistent groups using
non-persistent LIC workload capping group support, so
underlying LIC operations to support persistent groups
(e.g. create group) occur every IPL.  On a given IPL,
a system hang may result from operating system actions
corresponding to an ADDWLCGRP command issued on a
previous IPL.  In short, if workload capping is being
used, the system is at risk for the hang problem.

CORRECTION FOR APAR 'MA44578' :
-------------------------------
The lock protocol error in LIC workload capping group
support is fixed.

CIRCUMVENTION FOR APAR 'MA44578' :
----------------------------------
None.


Activation Instructions


None.




Special Instructions

None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System.............................. i
Models..............................
Release............................. V7R2M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA44578
Superseded by:......................
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C5310720


System i Support

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Document information

More support for: i family

Software version: V7R2M0

Operating system(s): OS/400

Reference #: MF60085

Modified date: 30 April 2015