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MF67697 - LIC-OTHER-SRCB6005121-INCORROUT DURING IASP QUIESCE, AN ERRO

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-OTHER-SRCB6005121-INCORROUT DURING IASP QUIESCE, AN ERRO


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

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



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
AGREED TO IN THE APPLICABLE LICENSE AGREEMENT OR AN APPLICABLE SUPPORT
AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
During IASP quiesce, multiple tasks were started to scan for
changed IASP pages that need to be written out. Code did not
properly handle a buffer creation event, while running in a
Critical Section.

Avoiding an IASP quiesce (i.e. Vary Off) would avoid the
exposure.

Service Keywords:
word 1 srcB6005121 B6005121
word 3 src0002000A 0002000A
word 4 src00100013 00100013

Task SMCHGPGSCANxx
SmMtChangedPageWriter -> SmMtSeqPageScanner

CORRECTION FOR APAR MA48550 :
-----------------------------
The code is changed to prevent passing a NULL pointer to a task.
Instead we will run with the tasks that have already been
started before being unable to allocate a buffer.  If the buffer
allocate fails for the first task we are starting we will use
the existing single threaded IASP quiesce code.

CIRCUMVENTION FOR APAR MA48550 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS IS A DELAYED PTF TO BE APPLIED AT IPL TIME.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF67245      LIC-IPL-PERF improve shutdown times.

Summary Information

System..............................i
Models..............................
Release.............................V7R4M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA48550
Superseded by:......................View fix details for PTF MF68358
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C1091740


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Document Information

Modified date:
17 April 2021