[asterisk-bugs] [JIRA] (ASTERISK-25837) file: Blocking when using FIFO

[Jean Aunis - Prescom (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=229984#comment-229984 ] 

Jean Aunis - Prescom commented on ASTERISK-25837:
-------------------------------------------------

Yes, we reproduce it systematically. Here is a piece of dialplan to reproduce it :

{code:title=extensions.conf|borderStyle=solid}
[default]
exten => 601,1,System(mkfifo /var/spool/asterisk/monitor/${UNIQUEID}-in.alaw)
same  => n,System(mkfifo /var/spool/asterisk/monitor/${UNIQUEID}-out.alaw)
same  => n,MixMonitor(/dev/null,bt(${UNIQUEID}-out.alaw)r(${UNIQUEID}-in.alaw))
same  => n,Set(DB(test/monitoredChannel)=${CHANNEL})
same  => n,Dial(SIP/601)

exten => 602,1,System(mkfifo /var/spool/asterisk/monitor/${UNIQUEID}-in.alaw)
same  => n,System(mkfifo /var/spool/asterisk/monitor/${UNIQUEID}-out.alaw)
same  => n,MixMonitor(/dev/null,bt(${UNIQUEID}-out.alaw)r(${UNIQUEID}-in.alaw))
same  => n,Dial(SIP/602,,F)
same  => n,StopMixMonitor()
same  => n,AGI(stopMixMonitorOnOtherChannel.php,${DB(test/monitoredChannel)})
{code}

The AGI script stopMixMonitorOnOtherChannel.php connects to the AMI and calls the command StopMixMonitor on the provided channel.

Then, here are the actions to perform to freeze :
- 600 dials 601
- 601 unhooks the call
- on a seconds line, 601 dials 602
- 602 unhooks the call
- 601 hangups the call with 602

Here asterisk freezes.

> file: Blocking when using FIFO
> ------------------------------
>
>                 Key: ASTERISK-25837
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25837
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Applications/app_mixmonitor
>    Affects Versions: 13.7.2
>         Environment: OS : RedHat 7.2
> Kernel: 3.10.0
> Asterisk: 13.7.2
>            Reporter: Jean Aunis - Prescom
>            Assignee: Jean Aunis - Prescom
>         Attachments: backtrace-threads-2016-03-16.txt, backtrace-threads.txt, core-show-locks-2016-03-16.txt, core-show-taskprocessors-2016-03-16.txt, core-show-taskprocessors.txt, core-show-threads-2016-03-16.txt, core-show-threads.txt, debug_log_25837.txt, full-20160310
>
>
> We encountered an Asterisk freeze recently. The machine was not especially loaded, less than 10 calls where going on.
> It seems that two channels where stuck in the application StopMixMonitor.
> Please find attach the results of "core show threads", "core show taskprocessors" and a backtrace.



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