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Cisco Bug: CSCul04184 - SIP Proxy core dump handling large scale SIP based federation traffic

Last Modified

Feb 10, 2017

Products (4)

  • Cisco Unified Communications Manager IM & Presence Service
  • Cisco Unified Communications Manager IM and Presence Service Version 9.1
  • Cisco Unified Communications Manager IM and Presence Service Version 10.0
  • Cisco Unified Presence Version 8.6

Known Affected Releases

10.0(1) 8.6(5) 9.1(1)

Description (partial)

One of the SIP Proxy worker processes generates a core dump every 1 to 2 days under high load. This worker process then shuts down, and is immediately replaced by a new worker process, with no loss of service.

A bug in SIP Proxy shared memory management logic can result in this core dump being generated. It is related to a race condition accessing memory - that should only be seen at very high SIP federation traffic rates.

This is an intermittent issue that impacts that one worker process only. All 19 other worker processes continue to process packets without issue. And the affected worker process is immediately replaced, bringing the quota back up to 20 processes.
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