[asterisk-bugs] [JIRA] (ASTERISK-22581) AMI: ConfbridgeList has race condition causing crashes

[Timo Teräs (JIRA)]

Timo Teräs created ASTERISK-22581:
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             Summary: AMI: ConfbridgeList has race  condition causing crashes
                 Key: ASTERISK-22581
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-22581
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Applications/app_confbridge
    Affects Versions: 11.5.1
            Reporter: Timo Teräs


I have started to get random crashes on 11.5.1 (10.4.1 is known to be stable) with ConfBridge setups. I managed to get non-debug enabled core, and pinpointed the issue to handling ConfbridgeList AMI request.

The incomplete backtrace is:
(gdb) where                                                                     
#0  0x1170ee21 in ast_channel_name ()                                           
#1  0x4f8d2000 in ?? () from /usr/lib/asterisk/modules/app_confbridge.so        
#2  0x4f8d2296 in ?? () from /usr/lib/asterisk/modules/app_confbridge.so
#3  0x117764e8 in ?? ()                                                 
#4  0x1177a159 in ?? ()                                                         
#5  0x117d1cf0 in ?? ()                                                         
#6  0x117dc72b in ?? ()                                                         
#7  0x4feacb8f in start_thread () from /lib/libpthread.so.0.9.32        
#8  0x501b2ffa in clone () from /lib/libc.so.0.9.32                     

And I managed to disasemble the the two functions from app_confbridge.so with matches, so the beginning of stack trace is:
  ast_channel_name(NULL)
  action_confbridgelist_item() in app_confbridge.c
  action_confbridgelist() in app_confbridge.c

Apparently there is some locking issue / race condition that triggers this.


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