A fix is available
APAR status
Closed as program error.
Error description
System could hang with a stack similar to, --- CPU #8 --- pvthread+794800 STACK: [00575764]slock+000104 (0000000000000003, F1000815B0232FF0 [??]) [000090C4].disable_lock+0000C0 () [05E13DA8]in_pcbhashlookup3+0003E8 (??, ??, ??, ??, ??, ??, ??, ??) [05E8D6D4]tcp_input0+000AD4 (??, ??, ??, ??) [05E965E4]tcp_input+000064 (F1000E008FAD3000, 0000001400000014) [05DEC04C]ipintr_noqueue_post_fw+0009CC (000000000529E490, F1000E008FAD3000, F1000815B02339C0) [05DED300]ipintr_noqueue+000120 (??, ??, ??) [05DED4F0]ipintr+0000F0 () [0019CA0C]i_offlevel+00012C (??, ??) [0019C54C]i_softmod+0005CC () [001EDACC]flih_util+000258 ()
Local fix
Problem summary
System could hang with a stack similar to, --- CPU #8 --- pvthread+794800 STACK: 00575764 slock+000104 (0000000000000003, F1000815B0232FF0 ?? ) 000090C4 .disable_lock+0000C0 () 05E13DA8 in_pcbhashlookup3+0003E8 (??, ??, ??, ??, ??, ??, ??, ??) 05E8D6D4 tcp_input0+000AD4 (??, ??, ??, ??) 05E965E4 tcp_input+000064 (F1000E008FAD3000, 0000001400000014) 05DEC04C ipintr_noqueue_post_fw+0009CC (000000000529E490, F1000E008FAD3000, F1000815B02339C0) 05DED300 ipintr_noqueue+000120 (??, ??, ??) 05DED4F0 ipintr+0000F0 () 0019CA0C i_offlevel+00012C (??, ??) 0019C54C i_softmod+0005CC () 001EDACC flih_util+000258 () Also there will be FIN-URG-ACK network storm
Problem conclusion
While retransmitting FIN, Code is modified to check whether we have already received ACK for the previous FIN and it was not processed correctly. In this case restore the tcp connection's state and retransmit FIN. This avoids FIN-URG-ACK storm.
Temporary fix
Comments
APAR Information
APAR number
IV48360
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2013-09-12
Closed date
2013-09-12
Last modified date
2014-02-17
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 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U859520
UP14/02/17 I 1000
PTF to Fileset Mapping
U859520 bos.net.tcp.client 6.1.8.17
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Document Information
Modified date:
17 February 2014