APAR status
Closed as program error.
Error description
A tcp connection can hang and never send the last bytes
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * Systems running the 5300-12 Technology Level with * bos.net.tcp.client below the 5.3.12.8 level. **************************************************************** * PROBLEM DESCRIPTION: * An established tcp connection can hang and never send the last * bytes. This has been seen primarily on VIO Clients, when * transferring large amounts of data. * * It happens when the send for the previous packet is * ACKed all at once before the call to ip_output returns back to * tcp_output. * * To determine if you're experiencing this problem, run * 'netstat -an' in a 5 sec loop. * If you notice the Send-Q value has the same non-zero value for * the same established connection after a couple of iterations, * you may be experiencing this problem. **************************************************************** * RECOMMENDATION: * Install APAR IV32615. ****************************************************************
Problem conclusion
TCP code is modified to record all acknowledgement recepits and make sure those last bytes were also sent. This change solves tcp hang issue
Temporary fix
********* * HIPER * *********
Comments
5300-12 - use AIX APAR IV32615
APAR Information
APAR number
IV32615
Reported component name
AIX 5.3 EXT SUP
Reported component ID
5765G0399
Reported release
53E
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Submitted date
2012-11-27
Closed date
2012-11-27
Last modified date
2013-11-23
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 EXT SUP
Fixed component ID
5765G0399
Applicable component levels
R53E PSY
UP
[{"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":"53E","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
23 November 2013