[asterisk-bugs] [JIRA] (ASTERISK-29821) Deadlock in bridge_channel_internal_join() on local channels.

[Krzysztof Trempala (JIRA)]

Krzysztof Trempala created ASTERISK-29821:
---------------------------------------------

             Summary: Deadlock in bridge_channel_internal_join() on local channels.
                 Key: ASTERISK-29821
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29821
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Bridges/bridge_builtin_features
    Affects Versions: 18.9.0
         Environment: Ubuntu 20.04
            Reporter: Krzysztof Trempala


We've had a couple instances of a deadlocks. Deadlocks in function bridge_channel_internal_join() on local channels.
{noformat} 
 [Thread_1]                                          [Thread_2]
     |                                                   |
 bridge_channel_internal_join(bridge_channel1)           |
   ..                                                    |
   ast_bridge_lock(bridge_channel1->bridge1);            |
   bridge_channel1->chan <= "local_chan;1"               |
   ast_channel_lock(bridge_channel1->chan);              |
   peer = ast_local_get_peer(bridge_channel1->chan);     |
   peer <= "local_chan;2"                                |
     |                                                   |
     |                                               bridge_channel_internal_join(bridge_channel2)
     |                                                 ..  
     |                                                 ast_bridge_lock(bridge_channe2->bridge2);
     |                                                 bridge_channel2->chan <= "local_chan;2"
     |                                                 ast_channel_lock(bridge_channel2->chan);
     |                                                 peer = ast_local_get_peer(bridge_channel2->chan);
     |                                                 peer <= "chan_local;1"
     |                                                  ..
     |                                                 ast_channel_lock(peer);  <== wait for lock on "chan_local;1"
     | 
     |
   ast_channel_lock(peer);  <== wait for lock "local_chan;2" <== DEADLOCK
{noformat} 



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