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MF66987 - LIC-DB2MIRROR RDMA socket connect failure following link fai

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-DB2MIRROR RDMA socket connect failure following link fai


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
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including programs that circumvent control technology designed to limit
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for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

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REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
An RDMA socket may hang or fail while attempting to connect if a
link failure occurs. In some cases the connection will be
successful but LICLOG 2C002102 will occur on the server system
showing an 80 exception in LoRdmaEndpoint::passiveConnect.

CORRECTION FOR APAR MA48159 :
-----------------------------
During connection establishment, the link failure may require
resending the connect message over a second RDMA link. Under
certain conditions this could misorder the messages or the
listening server socket could attempt to create two, duplicate,
child endpoints, one of which would then incorrectly attempt to
reset the connection. LoRdmaEndpoint has been corrected to
handle these timing and ordering issues so that a single child
endpoint is correctly established.

CIRCUMVENTION FOR APAR MA48159 :
--------------------------------
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
--------------  ------------------------------------------------------------
   MF66512      LIC-DB2MIRROR RDMA socket hang after link failure
   MF66212      LIC-DB2MIRROR Deadlock Retrieving NRG Connections
   MF66189      LIC-DB2MIRROR RDMA socket hang on close
   MF66097      LIC-DB2MIRROR Add additional RDMA socket debug capability
   MF65996      LIC-COMM Db2 Mirror RDMA connection hang following RDMA link
   MF65760      LIC-COMM Db2 Mirror RDMA connection hang during connect

Summary Information

System..............................i
Models..............................
Release.............................V7R4M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA48159
Superseded by:......................View fix details for PTF MF99304
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C0121740


IBM i Support

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Document Information

Modified date:
03 March 2021