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MF51968 - LIC-COMM-OTHER-WAIT DEADLOCK IN SOCKETS

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

LIC-COMM-OTHER-WAIT DEADLOCK IN SOCKETS


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  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

-----------------------------------------------
dup2 deadlock SAPs JVM, intermittently, stall with IBM i 7.1 in
a thread with the following call stack: Type Program Statement
Procedure P libnet.so 887 0000009C Java_java_net_PlainSocketIm >
P libnet.so 265 000000B4 closefd P libc.a(shr_64.o) 00000020
dup2 P libc.a(shr_64.o) 00000048 fcntl P libc.a(shr_64.o)
000001E8 __fcntl P unix 00000008 <syscall64>:kfcntl

CORRECTION FOR APAR MA40356 :
-----------------------------
The timing window that exposed the deadlock between dup2() and
accept() processing has been eliminated.

CIRCUMVENTION FOR APAR MA40356 :
--------------------------------
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
--------------  ------------------------------------------------------------
   MF51055      LIC-COMM-TCPIP CLIENT SOCKS TO SOCKS SERVER ON LOOPBACK STAR

Summary Information

System..............................i
Models..............................
Release.............................V7R1M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA40356
Superseded by:......................View fix details for PTF MF99011
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C1116710


System i Support

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Document Information

Modified date:
10 January 2011