IBM Support

MF63558 - OSP-OTHER-THREADS-INCORROUT SYSTEM HANG ON CTL QPACTL01 MSCP

PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

OSP-OTHER-THREADS-INCORROUT SYSTEM HANG ON CTL QPACTL01 MSCP


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

-----------------------------------------------
System hang. Jobs waiting for a seize on controller QPACTL01.
That job was waiting for a seize on module #mscptsk which was
held by task MSCP. MSCP had been waiting for hours on a gate
locked by module SnaPc2QPairStatic.
If a user is logged on, they may run fine. If not, they are
unable to log in. APPC, Enterprise Extender, and other
communications controllers may also stop responding to user
requests such as vary on or vary off due to MSCP task deadlock.
Eventually the console hangs so they have to do a main store
dump and IPL to recover.

CORRECTION FOR APAR MA46356 :
-----------------------------
System deadlock on a LIC SNA component gate which is used to
serialize access to FID2 path control for an APPC controller and
updates to its FID5 path control list for HPRIP/RTP connections.
One of the routines in the RTP connection take down and bring up
path invoked to perform HPR path switches attempted to obtain
the shared and exclusive lock out of order causing deadlock. The
ordering problem has been fixed by removing the unneeded shared
lock and replacing it with a single exclusive lock request.

CIRCUMVENTION FOR APAR MA46356 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


1.- Vary off all *APPN controllers using:
WRKCFGSTS *CTL *APPC
Another option is to vary off all *APPN controllers using:
VRYCFG CFGOBJ(*APPN) CFGTYPE(*CTL) STATUS(*OFF)

2.- Close all USER type RTP sessions with command:
WRKAPPNSTS, option 2 "Work with RTP Connections".
Close all remaining RTP sessions with option 10.

3.- Install/Remove this PTF

4.- Proceed to vary controllers back on with:
WRKCFGSTS *CTL *APPC
or,
VRYCFG CFGOBJ(*APPN) CFGTYPE(*CTL) STATUS(*ON)


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF60283      LIC-COMM-OTHER-WAIT TELNET AND SNA COMMUNICATIONS HANG

Summary Information

System.............................. i
Models..............................
Release............................. V7R2M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA46356
Superseded by:......................
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C7290720


System i Support

IBM disclaims all warranties, whether express or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. By furnishing this document, IBM grants no licenses to any related patents or copyrights. Copyright © 1996,1997,1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 IBM Corporation. Any trademarks and product or brand names referenced in this document are the property of their respective owners. Consult the Terms of use link for trademark information.

Document information

More support for: i family

Software version: V7R2M0

Operating system(s): OS/400

Reference #: MF63558

Modified date: 23 May 2017