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Cisco Bug: CSCur27703 - hctmConfig memory leak during high volume of UNCR results in core

Last Modified

Jun 23, 2020

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Description (partial)

During a prolonged high volume of UNCR the hctmConfig process memory utilization increases until the maximum allowed is reached and then cores.  This was observed on several in-service production ISDS running ISR 1.5.1 (f2.3.0.12 p2).  The memory leak does not appear on systems receiving normal rates of UNCRs.

The high rate of UNCRs was caused by STBs not receiving UNCC.  The UNCC messages were lost on the network and not associated with this BR.  Since large numbers of STBs were not receiving UNCC, they were constantly in a retry loop (Send UNCR, no UNCC received, wait based on a retry scheme, repeat).
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