[asterisk-bugs] [JIRA] (ASTERISK-25844) Ghost channels in "core show channels" output

[Etienne Lessard (JIRA)]

Etienne Lessard created ASTERISK-25844:
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             Summary: Ghost channels in "core show channels" output
                 Key: ASTERISK-25844
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25844
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Core/Channels
    Affects Versions: 13.7.2
         Environment: Debian 8.3 amd64
            Reporter: Etienne Lessard
            Severity: Minor


Given I have two 2 SIP users, Alice (SIP/alice) and Bob (SIP/bob)
Given I have the following queues.conf:
{noformat}
[sales]
strategy = ringall
member => Local/52 at default

[wait]
stategy = ringall
{noformat}

Given I have the following extensions.conf
{noformat}
[default]
exten = 50,1,NoOp()
same  =   n,Queue(sales)
same  =   n,Hangup()

exten = 51,1,NoOp()
same  =   n,Queue(wait)
same  =   n,Hangup()

exten = 52,1,NoOp()
same  =   n,Dial(SIP/bob)
same  =   n,Hangup()

exten = 53,1,NoOp()
same  =   n,Bridge(SIP/alice-00000000)
same  =   n,Hangup()
{noformat}
When Alice calls the 50 extension
And Bob answers
Then there is 1 temporary ghost channel "Local/52 at default-00000000;1" that can be seen in the "core show channels concise" output
When Alice's channel is redirected to the 51 at default extension via the AMI "Redirect" command
When a "channel originate SIP/bob extension 53 at default" is done
And Bob answers and is bridged with Alice's channel
And Alice's channel is hanged up via the AMI "Hangup" command
Then there are 2 permanent ghost channels in the output of core show channels:
{noformat}
el*CLI> core show channels
Channel              Location             State   Application(Data)             
Local/52 at default-000 50 at default:1         Up      AppQueue((Outgoing Line))     
Surrogate/SIP/69jqad 51 at default:1         Down    (None)                        
0 active channels
0 active calls
4 calls processed
{noformat}


So this scenario is a bit complex, I've tried finding a simpler one but was not able to. With this scenario, I've been able to produce ghost channels systematically. This impact us because we have an external application (a switchboard application) that use Asterisk in this kind of way.

The only impact I have found is that the output of "core show channels" becomes less and less useful (for administration purpose) as ghost channels adds up.

When we try to hangup one of these ghost channels via "channel request hangup", it says "<channel> is not a known channel". It seems like these channels only exists in the stasis cache and not in the ao2_container of channels.



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