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Cisco Bug: CSCuj24022 - 15.0 - MME - Sig11 - Seg fault - sn_memblock_cache_block_flush

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(1) 15.0(14)

Description (partial)

Symptom:
MME would experience Memory  corruption and Crash with Function: : " Sig 11 - Seg fault - sn_memblock_cache_block_flush".

Conditions:
MME is loaded with 600K Active Subscribers and having Attach rate of around 600 Attaches/Sec.
Under this load condition, if we encounter a L3 failure for S11 interface, MME would experience memory corruption and will result in Crash :  " Sig 11 - Seg fault - sn_memblock_cache_block_flush".
The crashes would continue till the S11 path is restored or the Subscriber load goes away.

RCA:
DNS client was rebined , dns-client memory is cleared. But mme-application continue to access freed memory.
Hence the crash.
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