[asterisk-bugs] [JIRA] (ASTERISK-27212) bridge_softmix: Quickly joining/leaving may cause video stream to remain in SFU

[Richard Mudgett (JIRA)]

Richard Mudgett created ASTERISK-27212:
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             Summary: bridge_softmix: Quickly joining/leaving may cause video stream to remain in SFU
                 Key: ASTERISK-27212
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27212
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
            Reporter: Richard Mudgett


When a participant quickly joins/leaves a conference bridge in SFU there seems to be a race condition where the renegotiation to add the newly joined participant occurs for anyone still in the bridge but the renegotiation to remove the stream may not occur. This causes a "Waiting For Video" to show up on the existing participants indefinitely.

There are several problems:
# The main problem is a deadlock between the bridge_channel and channel locks.  Also the bridge lock needs to be held for other renentrancy reasons concerning the bridge struct members.
# A FRACK occasionally happens when the stream topology is changing.
# A crash can occasionally happen while the SDP is renegotiated.



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