A fix is available
APAR status
Closed as program error.
Error description
There are two symptoms for this. One is that memory will be used up and eventually network memory will be exhausted. The list of sockets of the free list will be large -- often in the hundreds of thousands. The other symptom is the statistic: "Connection dropped due to duplicate SYN packets" will be large. Usually it is zero. Note that if the system freezes and is rebooted, this count will be 0 so in the snap it will be 0. But issuing netstat -s using kdb from a dump of the system will provide the value at the time the system dump was forced (assuming a system dump is forced).
Local fix
Problem summary
Customer system freezes. The network memory is exhausted and also the statistic: "Connection dropped due to duplicate SYN packets" was very large ( 744204).
Problem conclusion
When we identify a packet as duplicate SYN and before dropping it, we will unref the socket ( of existing connection). Later when socket is closEd it will get closed without any issue.
Temporary fix
Comments
5300-10 - use AIX APAR IZ83149 5300-11 - use AIX APAR IZ91126 5300-12 - use AIX APAR IZ91125 6100-03 - use AIX APAR IZ94544 6100-04 - use AIX APAR IZ94537 6100-05 - use AIX APAR IZ94531 6100-06 - use AIX APAR IZ94528 6100-06 - use AIX APAR IZ86972 7100-01 - use AIX APAR IZ99505
APAR Information
APAR number
IZ91125
Reported component name
AIX 5.3
Reported component ID
5765G0300
Reported release
530
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2010-12-16
Closed date
2010-12-16
Last modified date
2013-04-17
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 5.3
Fixed component ID
5765G0300
Applicable component levels
R530 PSY U838600
UP11/02/22 I 1000
PTF to Fileset Mapping
U838600 bos.net.tcp.client 5.3.12.3
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11P","label":"APARs - AIX 5.3 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"530","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
17 April 2013