A fix is available
APAR status
Closed as program error.
Error description
If tcp_nodelayack is set on each end of 2 socket pair, it could lead to a spurious sorwakeup when a socket is not readable, causing the next read on the socket to return EAGAIN. This is especially true if the socket pair are using the loopback interface.
Local fix
disable tcp_nodelayack
Problem summary
pollset_poll returns back to the application with POLLIN, even though the socket is not readable, causing next read on the socket to return EAGAIN.
Problem conclusion
Code is modified to check if the socket is readable before awakening the process
Temporary fix
Comments
5300-10 - use AIX APAR IZ91031 5300-11 - use AIX APAR IZ91124 5300-12 - use AIX APAR IZ91123 6100-03 - use AIX APAR IZ94543 6100-04 - use AIX APAR IZ81307 6100-05 - use AIX APAR IZ94530 6100-06 - use AIX APAR IZ85844 7100-00 - use AIX APAR IZ92383
APAR Information
APAR number
IZ94543
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2011-02-06
Closed date
2011-02-06
Last modified date
2013-04-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U839021
UP11/03/22 I 1000
PTF to Fileset Mapping
U839021 bos.net.tcp.client 6.1.3.9
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Document Information
Modified date:
16 April 2013