[Freeswitch-users] Sometimes "hanging" channels

[Brian West]

It;s not that it was never received, it was probably deadlocked and never
sent.

/b


On Mon, Oct 15, 2018 at 7:46 AM Vallimamod Abdullah <vma at vallimamod.org>
wrote:

> Hi,
>
> The message "Locked, Waiting on external entities" is not alarming by
> itself as it is always logged on hangup. But it should be followed by:
>
> [NOTICE] switch_core_session.c:1683 Session XXX (sofia/internal/YYY) Ended
> [NOTICE] switch_core_session.c:1687 Close Channel sofia/internal/YYY
> [CS_DESTROY]
>
> If it is not the case then, you have an app or a module that is holding a
> lock on the session and preventing its release.
>
> And this happens after the reporting state i.e. after the hangup_complete
> event and CDR posting. So there may be other causes for your missing events.
>
>
>
> Best Regards,
> --
> Vallimamod Abdullah
> SIP Solutions
> vma at sip.solutions
> linkedin.com/in/vallimamod
> .
>
>
> > On 10 Oct 2018, at 15:54, Markus Bönke <mbodbg at gmx.net> wrote:
> >
> > So far I found out that the channel was kept open, because our ESL
> application never received a CHANNEL_HANGUP and CHANNEL_HANGUP_COMPLETE
> event. I’m running an ESL trace with tshark now. If it happens again I can
> see if those events are really not send by FS or they get lost in our app.
> If it turns out that FS sometimes is not sending the events we will upgrade
> to 1.8.2.
> >
> > Thanks and regards
> >
> > Markus
> >
> >
> >> Am 10.10.2018 um 14:03 schrieb Steven Ayre <steveayre at gmail.com>:
> >>
> >> If you take a gcore it'll generate a core dump. You could then dig into
> it with gdb to find the thread for that channel and see what lock it's
> waiting on.
> >> However the gcore will pause the process for a while, so it will impact
> on any other calls on that box.
> >>
> >> Have you tried reproducing it on 1.8?
> >>
> >> On Tue, 9 Oct 2018 at 20:36, Markus Bönke <mbodbg at gmx.net> wrote:
> >> Hello All,
> >>
> >> we are running freeswitch 1.6.20, calls are controlled via ESL, CDRs
> are written with mod_xml_cdrl. Sometimes we see „hanging“ channels. In such
> a case the CDR via mod_xml_cdr is written and the last log entry for such a
> call is "Locked, Waiting on external entities“.
> >> ...
> >>
> freeswitch.log.2018-10-09-10-19-07.1:db2908e3-c06b-4293-88b1-e18cffb66263
> 2018-10-09 10:18:15.197345 [DEBUG] switch_core_state_machine.c:610
> (sofia/internal/anonymous at anonymous.invalid) State Change CS_REPORTING ->
> CS_DESTROY
> >>
> freeswitch.log.2018-10-09-10-19-07.1:db2908e3-c06b-4293-88b1-e18cffb66263
> 2018-10-09 10:18:15.197345 [DEBUG] switch_core_session.c:1665 Session
> 166111 (sofia/internal/anonymous at anonymous.invalid) Locked, Waiting on
> external entities
> >> ...
> >> How can I proceed to further analyze the problem ? In the last log line
> I also see the session number (Session 166111) - is there a way to find out
> on which external entity it is waiting?
> >>
> >> Thanks and regards
> >>
> >> Markus
> >>
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