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Luis Vazquez

2004-Mar-03 09:35 UTC

[Asterisk-Users] Segfault when parking from extension dialed inside AGI.

Hello all,

Asterisk is segfault dying when I try to park a call from an extension 
dialed from an AGI script.
The situation is as follows:
I call from a sip phone (really It doesn't matter if It's SIP or not) to
extension 181 (corresponding to a mgcp DG-104S phone).
.....
exten => 181,1,AGI(dummydial.agi,MGCP/aaln/1@mgcp01)
.....
dummydial.agi is only a simplified test script I made to isolate the 
problem, It only makes a dial to the given channel:
#############################################################
#!/usr/bin/perl
# dummydial.agi: Marcar internos con AGI
use strict;
use Asterisk::AGI;

local $::INPUT_RECORD_SEPARATOR="\n";
local $::OUTPUT_AUTOFLUSH=1;

my $agi = new Asterisk::AGI;
my %input = $agi->ReadParse();
my ($dialstring) = shift @ARGV;

$agi->verbose("Dialing: $dialstring",1);
my $ret = $agi->exec('Dial',"$dialstring|40|t");
# $ret =
$agi->exec('Macro',"generic_dial|$dialstring|$vm");  # This
is
the real thing, crashes to
# exit 0;
##################################################################

then I peak the phone and the call is established perfectly. 
Then I want to park the call with the following configuration at 
parking.conf:
###################################
[general]
parkext => 700                          ; What ext. to dial to park
parkpos => 701-720                      ; What extensions to park calls on
context => parkedcalls                  ; Which context parked calls are in
parkingtime => 120                      ; Number of seconds a call can 
be parked
####################################

so from the called extension (181) I press (#) I do hear "transfer"
and
then I dial 700.
Then the voice tell mi the call is parked at extension 701, but as soon 
as I hangup the called phone
and try to peak the parked call (and sometimes even before) Asterisk 
dies with segmentation fault.
As I said before It doesn't depend if I made a call from SIP to SIP or 
MGCP to SIP or MGCP to MGCP extension.
The final result (the server crashing with segfault) is always the same.
However If I do exactly the same but with the extension dialing directly 
from extensions.conf with:
exten => 183,1,Dial(MGCP/aaln/4@mgcp01,40,tr)
the parking and recovering of the calls works correctly without any problem.

This is the output on the console:
========================================================================*CLI>
-- Executing AGI("SIP/ipcontact.com.uy-0817d0c0",
"dummydial.agi|MGCP/aaln/1@mgcp01") in new stack
    -- Launched AGI Script /var/lib/asterisk/agi-bin/dummydial.agi
  dummydial.agi|MGCP/aaln/1@mgcp01: Dialing: MGCP/aaln/1@mgcp01
    -- AGI Script Executing Application: (Dial) Options: 
(MGCP/aaln/1@mgcp01|40|t)
    -- MGCP mgcp_request(aaln/1@mgcp01)
    -- MGCP cw: -1, dnd: 0, so: 0, sno: 0
    -- MGCP mgcp_new(MGCP/aaln/1@mgcp01-1) created in state: Down
    -- Called aaln/1@mgcp01
    -- MGCP/aaln/1@mgcp01-1 is ringing
    -- Endpoint 'aaln/1@mgcp01-1' observed 'hd'
    -- MGCP/aaln/1@mgcp01-1 answered SIP/ipcontact.com.uy-0817d0c0
    -- Attempting native bridge of SIP/ipcontact.com.uy-0817d0c0 and 
MGCP>/aaln/1@mgcp01-1
Mar  3 16:07:42 NOTICE[458781]: rtp.c:264 process_rfc3389: RFC3389 
support incomplete.  Turn off on client if possible
    -- Endpoint 'aaln/1@mgcp01-1' observed '#'
    -- Started music on hold, class 'default', on 
SIP/ipcontact.com.uy-0817d0c0
    -- Playing 'pbx-transfer' (language 'en')
    -- Endpoint 'aaln/1@mgcp01-1' observed '7'
    -- Endpoint 'aaln/1@mgcp01-1' observed '0'
    -- Endpoint 'aaln/1@mgcp01-1' observed '0'
    -- Stopped music on hold on SIP/ipcontact.com.uy-0817d0c0
    -- Started music on hold, class 'default', on 
SIP/ipcontact.com.uy-0817d0c0
  == Parked SIP/ipcontact.com.uy-0817d0c0 on 701
    -- Playing 'digits/7' (language 'en')
    -- Playing 'digits/0' (language 'en')
    -- Playing 'digits/1' (language 'en')
    -- AGI Script dummydial.agi completed, returning 0
    -- Endpoint 'aaln/1@mgcp01-1' observed 'hu'
    -- MGCP handle_request(aaln/1@mgcp01-1) ast_channel already destroyed
    -- MGCP handle_request(aaln/1@mgcp01) set vmwi(-)
    -- Endpoint 'aaln/1@mgcp01-1' observed 'hd'
    -- MGCP mgcp_new(MGCP/aaln/1@mgcp01-1) created in state: Down
    -- Endpoint 'aaln/1@mgcp01-1' observed '7'
    -- Endpoint 'aaln/1@mgcp01-1' observed '0'
    -- Endpoint 'aaln/1@mgcp01-1' observed '1'
    -- Executing ParkedCall("MGCP/aaln/1@mgcp01-1", "701")
in new stack
    -- MGCP mgcp_answer(MGCP/aaln/1@mgcp01-1) on aaln/1@mgcp01-1
    -- Stopped music on hold on SIP/ipcontact.com.uy-0817d0c0
    -- Channel MGCP/aaln/1@mgcp01-1 connected to parked call 701
    -- Attempting native bridge of SIP/ipcontact.com.uy-0817d0c0 and 
MGCP/aaln/1@mgcp01-1
Mar  3 16:07:53 WARNING[475166]: channel.c:846 ast_waitfor_nandfds: 
Thread 475166 Blocking 'SIP/ipcontact.com.uy-0817d0c0', already blocked 
by thread 458781 in procedure ast_waitfor_nandfds
Mar  3 16:07:54 WARNING[491551]: channel.c:846 ast_waitfor_nandfds: 
Thread 491551 Blocking 'SIP/ipcontact.com.uy-0817d0c0', already blocked 
by thread 458781 in procedure ast_waitfor_nandfds
......... MANY, MANY OF THIS ................
...................................................................
Mar  3 16:07:55 WARNING[491551]: channel.c:1364 ast_write: Thread 491551 
Blocking 'SIP/ipcontact.com.uy-0817d0c0', already blocked by thread 
458781 in procedure ast_waitfor_nandfds
    -- Timeout on SIP/ipcontact.com.uy-0817d0c0
  == CDR updated on SIP/ipcontact.com.uy-0817d0c0
    -- Executing Hangup("SIP/ipcontact.com.uy-0817d0c0", "")
in new stack
  == Spawn extension (local, t, 1) exited non-zero on 
'SIP/ipcontact.com.uy-0817d0c0'
    -- Executing GotoIf("SIP/ipcontact.com.uy-0817d0c0",
"1?4") in new stack
    -- Goto (local,h,4)
    -- Executing NoOp("SIP/ipcontact.com.uy-0817d0c0", "")
in new stack
Ouch ... error while writing audio data: : Broken pipe
Segmentation fault
=======================================================================
Does anybody knows a fix for this, or if there is a work around for this. 
I need to use AGI to handle the extensions because this is the only way 
(I guess) of doing something  interesting and dynamic with the calls 
(for example using a DB to keep the extensions information).
I thought about using  SET CONTEXT and SET EXTENSION and then make the 
dial from a special context, but then I have no easy way to access the 
other extensions (for example to make a transfer) from the called one.

We already made a bug report on this topic.

Thanks in advance for any help
Luis

Luis Vazquez

2004-Mar-03 10:33 UTC

head link

[Asterisk-Users] Segfault when parking from extension dialed inside AGI.

Hello again
After a few minutes of thinking (usefull sometimes :) I solved the 
problem of using the AGI to make the dialing decision while avoid doing 
the dial from inside the agi application without changing context (to 
keep access to other extensions using transfer).
Very simple, using SET PRIORITY together with SET VARIABLE  after I get  
the needed information,
and then exiting from agi before doing the Dial.
Something like this:

[macro-generic_dial]
;   ${ARG1} - Extension
;
exten => s,1,AGI(gotodial.agi,${ARG1})
exten => s,2,Hangup
exten => s,3,Dial(${DIALCHANNEL},40,tr) ; Ring the selected channel 40 
seconds
exten => s,4,GotoIf($[${VMBOX} = 0]?4:3)
exten => s,5,VoiceMail(u${VMBOX}@default) ; If unavailable, send to 
voicemail
exten => s,6,Hangup                             ; Hangup the call
exten => s,104,GotoIf($[${VMBOX} = 0]?104:103)
exten => s,105,VoiceMail(b${VMBOX}@default)     ; If busy, send to voicemail
exten => s,106,Hangup                           ; Hangup the call

[default]
;; Generic extention dialing
exten => _1XX,1,Macro(generic_dial,${EXTEN})

And using something like this inside the gotodial.agi script:
.............................
                    $agi->database_put("LastDial", $callinExten, 
$exten);  # To implement call return
                    $agi->verbose("Dialing: $dialstring",1);
                   
$agi->set_variable('DIALCHANNEL',"$dialstring");
                    $agi->set_variable('VMBOX',"$vm");
                    $agi->set_priority('3');
                    exit 0;
..............................

Anyway It would be nice If asterisk didn't die so easily (h323 transfer, 
agi dial and parking, openswitch channel's driver, speaking too loudly 
next to the server, etc)
Best regards
Luis



Luis Vazquez wrote:
> Hello all,
>
> Asterisk is segfault dying when I try to park a call from an extension 
> dialed from an AGI script.
> The situation is as follows:
> I call from a sip phone (really It doesn't matter if It's SIP or
not)
> to extension 181 (corresponding to a mgcp DG-104S phone).
> .....
> exten => 181,1,AGI(dummydial.agi,MGCP/aaln/1@mgcp01)
> .....
> dummydial.agi is only a simplified test script I made to isolate the 
> problem, It only makes a dial to the given channel:
> #############################################################
> #!/usr/bin/perl
> # dummydial.agi: Marcar internos con AGI
> use strict;
> use Asterisk::AGI;
>
> local $::INPUT_RECORD_SEPARATOR="\n";
> local $::OUTPUT_AUTOFLUSH=1;
>
> my $agi = new Asterisk::AGI;
> my %input = $agi->ReadParse();
> my ($dialstring) = shift @ARGV;
>
> $agi->verbose("Dialing: $dialstring",1);
> my $ret = $agi->exec('Dial',"$dialstring|40|t");
> # $ret =
$agi->exec('Macro',"generic_dial|$dialstring|$vm");  # This
> is the real thing, crashes to
> # exit 0;
> ##################################################################
>
> then I peak the phone and the call is established perfectly. Then I 
> want to park the call with the following configuration at parking.conf:
> ###################################
> [general]
> parkext => 700                          ; What ext. to dial to park
> parkpos => 701-720                      ; What extensions to park 
> calls on
> context => parkedcalls                  ; Which context parked calls 
> are in
> parkingtime => 120                      ; Number of seconds a call can 
> be parked
> ####################################
>
> so from the called extension (181) I press (#) I do hear
"transfer"
> and then I dial 700.
> Then the voice tell mi the call is parked at extension 701, but as 
> soon as I hangup the called phone
> and try to peak the parked call (and sometimes even before) Asterisk 
> dies with segmentation fault.
> As I said before It doesn't depend if I made a call from SIP to SIP or 
> MGCP to SIP or MGCP to MGCP extension.
> The final result (the server crashing with segfault) is always the same.
> However If I do exactly the same but with the extension dialing 
> directly from extensions.conf with:
> exten => 183,1,Dial(MGCP/aaln/4@mgcp01,40,tr)
> the parking and recovering of the calls works correctly without any 
> problem.
>
> This is the output on the console:
>
========================================================================>
*CLI>     -- Executing AGI("SIP/ipcontact.com.uy-0817d0c0",
> "dummydial.agi|MGCP/aaln/1@mgcp01") in new stack
>    -- Launched AGI Script /var/lib/asterisk/agi-bin/dummydial.agi
>  dummydial.agi|MGCP/aaln/1@mgcp01: Dialing: MGCP/aaln/1@mgcp01
>    -- AGI Script Executing Application: (Dial) Options: 
> (MGCP/aaln/1@mgcp01|40|t)
>    -- MGCP mgcp_request(aaln/1@mgcp01)
>    -- MGCP cw: -1, dnd: 0, so: 0, sno: 0
>    -- MGCP mgcp_new(MGCP/aaln/1@mgcp01-1) created in state: Down
>    -- Called aaln/1@mgcp01
>    -- MGCP/aaln/1@mgcp01-1 is ringing
>    -- Endpoint 'aaln/1@mgcp01-1' observed 'hd'
>    -- MGCP/aaln/1@mgcp01-1 answered SIP/ipcontact.com.uy-0817d0c0
>    -- Attempting native bridge of SIP/ipcontact.com.uy-0817d0c0 and 
> MGCP>/aaln/1@mgcp01-1
> Mar  3 16:07:42 NOTICE[458781]: rtp.c:264 process_rfc3389: RFC3389 
> support incomplete.  Turn off on client if possible
>    -- Endpoint 'aaln/1@mgcp01-1' observed '#'
>    -- Started music on hold, class 'default', on 
> SIP/ipcontact.com.uy-0817d0c0
>    -- Playing 'pbx-transfer' (language 'en')
>    -- Endpoint 'aaln/1@mgcp01-1' observed '7'
>    -- Endpoint 'aaln/1@mgcp01-1' observed '0'
>    -- Endpoint 'aaln/1@mgcp01-1' observed '0'
>    -- Stopped music on hold on SIP/ipcontact.com.uy-0817d0c0
>    -- Started music on hold, class 'default', on 
> SIP/ipcontact.com.uy-0817d0c0
>  == Parked SIP/ipcontact.com.uy-0817d0c0 on 701
>    -- Playing 'digits/7' (language 'en')
>    -- Playing 'digits/0' (language 'en')
>    -- Playing 'digits/1' (language 'en')
>    -- AGI Script dummydial.agi completed, returning 0
>    -- Endpoint 'aaln/1@mgcp01-1' observed 'hu'
>    -- MGCP handle_request(aaln/1@mgcp01-1) ast_channel already destroyed
>    -- MGCP handle_request(aaln/1@mgcp01) set vmwi(-)
>    -- Endpoint 'aaln/1@mgcp01-1' observed 'hd'
>    -- MGCP mgcp_new(MGCP/aaln/1@mgcp01-1) created in state: Down
>    -- Endpoint 'aaln/1@mgcp01-1' observed '7'
>    -- Endpoint 'aaln/1@mgcp01-1' observed '0'
>    -- Endpoint 'aaln/1@mgcp01-1' observed '1'
>    -- Executing ParkedCall("MGCP/aaln/1@mgcp01-1",
"701") in new stack
>    -- MGCP mgcp_answer(MGCP/aaln/1@mgcp01-1) on aaln/1@mgcp01-1
>    -- Stopped music on hold on SIP/ipcontact.com.uy-0817d0c0
>    -- Channel MGCP/aaln/1@mgcp01-1 connected to parked call 701
>    -- Attempting native bridge of SIP/ipcontact.com.uy-0817d0c0 and 
> MGCP/aaln/1@mgcp01-1
> Mar  3 16:07:53 WARNING[475166]: channel.c:846 ast_waitfor_nandfds: 
> Thread 475166 Blocking 'SIP/ipcontact.com.uy-0817d0c0', already 
> blocked by thread 458781 in procedure ast_waitfor_nandfds
> Mar  3 16:07:54 WARNING[491551]: channel.c:846 ast_waitfor_nandfds: 
> Thread 491551 Blocking 'SIP/ipcontact.com.uy-0817d0c0', already 
> blocked by thread 458781 in procedure ast_waitfor_nandfds
> ......... MANY, MANY OF THIS ................
> ...................................................................
> Mar  3 16:07:55 WARNING[491551]: channel.c:1364 ast_write: Thread 
> 491551 Blocking 'SIP/ipcontact.com.uy-0817d0c0', already blocked by
> thread 458781 in procedure ast_waitfor_nandfds
>    -- Timeout on SIP/ipcontact.com.uy-0817d0c0
>  == CDR updated on SIP/ipcontact.com.uy-0817d0c0
>    -- Executing Hangup("SIP/ipcontact.com.uy-0817d0c0",
"") in new stack
>  == Spawn extension (local, t, 1) exited non-zero on 
> 'SIP/ipcontact.com.uy-0817d0c0'
>    -- Executing GotoIf("SIP/ipcontact.com.uy-0817d0c0",
"1?4") in new
> stack
>    -- Goto (local,h,4)
>    -- Executing NoOp("SIP/ipcontact.com.uy-0817d0c0",
"") in new stack
> Ouch ... error while writing audio data: : Broken pipe
> Segmentation fault
> =======================================================================>
> Does anybody knows a fix for this, or if there is a work around for 
> this. I need to use AGI to handle the extensions because this is the 
> only way (I guess) of doing something  interesting and dynamic with 
> the calls (for example using a DB to keep the extensions information).
> I thought about using  SET CONTEXT and SET EXTENSION and then make the 
> dial from a special context, but then I have no easy way to access the 
> other extensions (for example to make a transfer) from the called one.
>
> We already made a bug report on this topic.
>
> Thanks in advance for any help
> Luis
>
>
> _______________________________________________
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> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users
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asterisk users - Mar 2004 - Segfault when parking from extension dialed inside AGI.

[Asterisk-Users] Segfault when parking from extension dialed inside AGI.

[Asterisk-Users] Segfault when parking from extension dialed inside AGI.