[asterisk-bugs] [Asterisk 0018818]: [patch] Crashing when using local channels and realtime on asterisk 1.8.3-rc2

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18818 
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Reported By:                nic
Assigned To:                russell
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Project:                    Asterisk
Issue ID:                   18818
Category:                   Channels/chan_local
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     closed
Target Version:             1.8.5
Asterisk Version:           SVN 
JIRA:                       SWP-3127 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             2011-02-15 14:13 CST
Last Modified:              2011-04-26 12:41 CDT
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Summary:                    [patch] Crashing when using local channels and
realtime on asterisk 1.8.3-rc2
Description: 
I have been having a problem with asterisk crashing when using local
channels and realtime on asterisk 1.8.3-rc2.
The example given here is I think the easiest way to reproduce this
problem.

In extensions.conf I have:

[internal]
switch => Realtime/extensions/p
exten => 301,1,Answer()
exten => 301,2,Dial(Local/501 at internal)
exten => 301,3,Hangup()
exten => 501,1,Answer()
exten => 501,2,Playback(demo-echotest)
exten => 501,3,Echo()
exten => 501,4,Hangup()

Where dialling 301 puts you through to 501 and you hear the echo test
message fine. However if I move 501 to the realtime database extensions
table and remove it from extensions.conf asterisk hangs on the local
channel dial, then completely dies a few minutes later (console stops
responding to commands) with killall -9 asterisk being the only way to stop
it.

In both cases I can dial 501 directly with no problem.

The last message on the console (with verbose 10) -- Executing
[300 at internal:2] Dial("SIP/1014-00000001", "Local/501 at internal")

Everything works fine with the exact same setup and asterisk 1.8.1.2 and
1.8.2.3.

Discussed a little on asterisk-users, Jonathan Thurman managed to
reproduce the problem with latest SVN of 1.8 branch.
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---------------------------------------------------------------------- 
 (0134138) svnbot (reporter) - 2011-04-26 12:41
 https://issues.asterisk.org/view.php?id=18818#c134138 
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Repository: asterisk
Revision: 315447

_U  trunk/
U   trunk/channels/chan_local.c

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r315447 | russell | 2011-04-26 12:41:52 -0500 (Tue, 26 Apr 2011) | 21
lines

Merged revisions 315446 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r315446 | russell | 2011-04-26 12:40:23 -0500 (Tue, 26 Apr 2011) | 14
lines
  
  chan_local: resolve a deadlock.
  
  This patch resolves a fairly complex deadlock that can occur with the
  combination of chan_local and a dialplan switch, such as dynamic
realtime
  extensions, which pulls autoservice into the picture when doing a
dialplan
  lookup.
  
  (closes issue https://issues.asterisk.org/view.php?id=18818)
  Reported by: nic
  Patches:
        issue18818.patch uploaded by jthurman (license 614)
        18818.v1.txt uploaded by russell (license 2)
  Tested by: nic, jthurman, kterzi, steve-howes, sysreq, IshMalik
........

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http://svn.digium.com/view/asterisk?view=rev&revision=315447 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-04-26 12:41 svnbot         Checkin                                      
2011-04-26 12:41 svnbot         Note Added: 0134138                          
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