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Cisco Bug: CSCuj47626 - MCU 5300 and 8510 master has long mutex locks, no web response and slave

Last Modified

Mar 06, 2018

Products (15)

  • Cisco TelePresence MCU 4500 Series
  • Cisco TelePresence MCU 4520
  • Cisco TelePresence MCU 4505
  • Cisco TelePresence MCU 4510
  • Cisco TelePresence MCU 5320
  • Cisco TelePresence MCU 4215
  • Cisco TelePresence MCU 4205
  • Cisco TelePresence MCU 4220
  • Cisco TelePresence MCU MSE 8420
  • Cisco TelePresence MCU 4203
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Known Affected Releases

4.1(1.59) 4.2(1.50) 4.3(1.68) 4.3(2.30) 4.3(2.32) 4.4(3.30) 4.4(3.33) 4.4(3.42) 4.4(3.49) 4.4(3.54)

Description (partial)

Symptom: A 5320 or 8510 can lock up indefinitely when console logging is enabled and a large number of messages are generated. No participants are able to join conferences. Certain web pages may not load. API commands may not get responses, leading to timeouts in API monitoring applications such as TMS.

Event log messages such as this:

 SYSTEM                  Info      mutex
0x9873BC0 (&port_mutex) locked for 9432.350s by
SYSTEM                  Info      mutex
0x982D7E0 (&conference_manager_mutex) locked for 9432.378s by

CONFERENCE              Info      programming rx filter for port 63810 took 54890617ms

Or just this:

SYSTEM                  Info      mutex 0x35E69654
(&h323StateMachineMutex) locked for 135.708s by

May be seen.

Conditions: This bug is triggered when an MCU's console port is connected to a terminal server that sends a software flow control XOFF message. Some time after the MCU receives the XOFF message, it will lock up.
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