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Cisco Bug: CSCvt55506 - Socket process causing High CPU

Last Modified

Aug 25, 2020

Products (3)

  • Cisco TelePresence Video Communication Server (VCS)
  • Cisco TelePresence Video Communication Server Model
  • Cisco Expressway

Known Affected Releases

X12.5 X12.5.3 X12.5.4 X12.5.5 X12.5.6 X12.5.7 X12.5.9 X12.6

Description (partial)

Symptom:
Some combination of the following:

- Poor video / audio call quality
- Kernel reports Tx hang/resetting, which causes existing connections to be terminated and be reestablished
- Expressway/VCS reports an application error. An alarm is raised reporting that an unexpected software error was detected (Application failed - WatchdogThread, ACR: raise Line: 0)
- High CPU reported for Expressway server consistently even with low to minimal activity. This can be confirmed by logging in as root, and then running:

~# top -b -n 1 -H

Output shows:
- Command: Socket 
- S: R (Running) state 

with a substantial TIME+ and %CPU

Example output:

top - 02:00:45 up 30 days, 40 min, 2 users, load average: 2.56, 2.01, 2.05
Threads: 498 total, 2 running, 496 sleeping, 0 stopped, 0 zombie
%Cpu(s): 36.4 us, 29.5 sy, 0.0 ni, 34.1 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st

PID   USER PR NI VIRT    RES    SHR  S %CPU %MEM  TIME+ COMMAND
15657 root -51 0 741512 511248 52380 R 99.9 8.4 2480:23 Socket

Conditions:
Expressway with X12.5 or later, after many calls have terminated abnormally.
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