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Cisco Bug: CSCsz11007 - Memory leak causing many processes to be killed by OOM Killer

Last Modified

Feb 12, 2018

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

5.1(3) 5.20(279.1.1) 6.0(224.1.1) 6.0(226.1.3) 6.1(3) 7.0(2)

Description (partial)

Many CUCM processes are killed some causing things like Web access and
alerting to be out. This may also impact AMC/RTMT, DRS backups and the ability to collect CDR records.

The OOM Killer reports some stats when it kills processes.  One of the stats seem to point to the depletion of lowmem memory (as shown below):
Apr  5 10:46:54 server1 kern 4 kernel: Normal free:3696kB min:3728kB low:7456kB high:11184kB active:204kB inactive:276kB present:901120kB pages_scanned:396 all_unreclaimable? yes
Apr  5 10:46:54 server1 kern 4 kernel: Normal: 0*4kB 0*8kB 1*16kB 1*32kB 1*64kB 0*128kB 0*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 3696kB

Memory leak eventually causes the system OS to start killing processes.
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