Cisco Bug: CSCte65329 - Address socket read events spin loop for gtp io
Jan 29, 2017
- Cisco 7600 Gateway GPRS Support Node
Known Affected Releases
Symptoms: 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. Conditions: 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
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