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Cisco Bug: CSCuq01753 - 8510 crashed due to previous participant resource leak

Last Modified

Sep 17, 2019

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

4.5(1.45) 4.5Release

Description (partial)

MCU 8510's previous participant queue exceeded the 128 limit and 'disconnected' participants started to take up resources without freeing them up after the conferences have ended. If this continues, the MCU could run out of resources for participants and restart.

MCU has many active conferences with disconnected 'previous participants' exceeding the 128 limit. There is a boxwide limit of 128 'previous participants'. Once this boxwide limit has been reached, the code looks for the oldest previous participant (i.e. the one disconnected the longest time ago), deletes it and re-uses its slot.

Unfortunately there can be a slight mismatch between which previous participant gets deleted and which slot is used. This mismatch can occur if the oldest previous participant was disconnected in the same second as another (or many
other) participant. This can occur with the 'Disconnect all' button on the web interface or when multiple participants are disconnecting at the same time without destroying the conferences first and many such conferences remain active (even after participants have disconnected). This can cause the previous participants list to exceed the box-wide limit and cause a resource leak.
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