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Cisco Bug: CSCte65329 - Address socket read events spin loop for gtp io

Last Modified

Jan 29, 2017

Products (1)

  • Cisco 7600 Gateway GPRS Support Node

Known Affected Releases


Description (partial)

When using TCP as the path protocol for charging, the GGSN CPU is seen at 
100% utilization at times with the GTP I/O process occupying the bulk of 
the CPU. Because of this, GTP Transfer Failures are seen on the charging 
path and CDRs start accumulating (buffering) on the system. The GGSN does
not recover from this condition, and can eventually cause system memory
depletion and related symptoms due to continuous buffering of CDRs.


This issue is seen when the charging gateway sends corrupted or invalid
byte streams towards the GGSN on the TCP socket established between the 
GGSN and the charging gateway. The corrupted byte stream results in
system error logs such as "LFN bit in CHRG msg should be set" since
the charging gateway sends packets with 20 byte headers even though the
charging path and GGSN are configured to process short (6 byte) headers.
Eventually the corrupted byte stream causes the GTP I/O process in GGSN 
to take up the bulk of the CPU causing the symtoms listed above.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
  • Related Community Discussions
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