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Cisco Bug: CSCvt88785 - mdns - Tracebacks seen on SDG while doing cache clear on Gladius

Last Modified

Oct 06, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

17.4.1

Description (partial)

Symptom:
mdns - Tracebacks seen on SDG while doing cache clear on Gladius 

Conditions:
Setup :
WLC Build : BLD_POLARIS_DEV_LATEST_20200414_101757_2
SDG BUild : BLD_POLARIS_DEV_LATEST_20200414_101757_2
WLC : Katar HA setup , SDG   

Steps to repro :
1) Have the WLC and AP running on above build .
2) Scaled DAO box with approx 10000 services and start exporting the same on SDG .
3) seen all the 10k services got exported to SDG fine without any issues .
4) Now did a cache clear on Service peer and seen the below Tracebacks on SDG .

Able to repro the issue again , Exported 7500 services and done cache clear and again seen the tracbacks 

Tracebacks with 10K services and doing cache clear :

switch-9300-SDG2#
*Apr 17 11:47:13.068: %SYS-3-CPUHOG: Task is running for (2128)msecs, more than (2000)msecs (1/1),process = mDNS.
-Traceback= 1#a1bd3c5f251e58b584156785fa2b2e0f  :55AEED010000+C398FE4 :55AEED010000+A8FBAA8 :55AEED010000+A8FC63E :55AEED010000+AAD977C :55AEED010000+C2FCEA2 :55AEED010000+C2FBE9E :55AEED010000+C3066FC :55AEED010000+C327D0F :55AEED010000+C31418D :55AEED010000+C3145C7 :55AEED010000+8B35A2C :55AEED010000+8B3AE49 :55AEED010000+8B313B5 :55AEED010000+8B32E23 :55AEED010000+8B0DC38 :55AEED010000+8B19037
*Apr 17 11:47:13.068: %SYS-3-CPUHOG: Task is running for (3130)msecs, more than (2000)msecs (1/1),process = mDNS.
-Traceback= 1#a1bd3c5f251e58b584156785fa2b2e0f  :55AEED010000+C398C4C :55AEED010000+C2CA0A1 :55AEED010000+C2CB276 :55AEED010000+C337346 :55AEED010000+C33A4CF :55AEED010000+8B434AD :55AEED010000+8B32E38 :55AEED010000+8B0DC38 :55AEED010000+8B19037 :55AEED010000+8B2D9F4

Tracback 2 -7500 services and cache clear :

-Traceback= 1#a1bd3c5f251e58b584156785fa2b2e0f  :55AEED010000+C342F60 :55AEED010000+C33442A :55AEED010000+C33A4CF :55AEED010000+8B434AD :55AEED010000+8B32E38 :55AEED010000+8B0DC38 :55AEED010000+8B190

Attached the decode and detailed logs for both SP and SDG .
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