[asterisk-bugs] [Asterisk 0018654]: [patch] [regression] Call Pickup Hangs Asterisk (deadlock?)

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18654 
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Reported By:                Docent
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18654
Category:                   Features
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     ready for testing
Target Version:             1.8.5
Asterisk Version:           SVN 
JIRA:                       SWP-3085 
Regression:                 Yes 
Reviewboard Link:           https://reviewboard.asterisk.org/r/1185/ 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2011-01-21 01:16 CST
Last Modified:              2011-05-04 06:16 CDT
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Summary:                    [patch] [regression] Call Pickup Hangs Asterisk
(deadlock?)
Description: 
Asterisk stops to service new calls when someone tries to pickup a call by
pressing *8. Some existing calls are also terminated, although others
continue to work. I still can run any command in the console, but I can't
stop or kill Asterisk. I can kill it only with -9 flag.
I found this trouble in versions 1.8.1, 1.8.2 and SVN.
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Relationships       ID      Summary
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has duplicate       0018906 Deadlock using pickup extension
has duplicate       0018955 after picking up a call, phones stop wo...
has duplicate       0019092 Calls getting stuck when dialing *8
related to          0019177 pickup beep choppy. debug log shows &qu...
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 (0134411) alecdavis (manager) - 2011-05-04 06:16
 https://issues.asterisk.org/view.php?id=18654#c134411 
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Has all of this been worth it.
Just for fun, had to remind myself what happens if only the chan_sip.c
code is implemented (which avoids deadlock).
When 2 keen office workers both try to pickup the ring phone across the
office using *8 with Asterisk SVN-trunk-r316584M  ----  SEGFAULT!

Worth it! Check the debug log below, masquerading into a channel thats a
ZOMBIE ????

[2011-05-04 23:07:06.500837] DEBUG[4460] features.c: Call pickup on chan
'SIP/gxp823-00000009<ZOMBIE>' by 'DAHDI/33-1'
[2011-05-04 23:07:06.501024] DEBUG[4460] chan_dahdi.c: Requested
indication 22 on channel DAHDI/33-1
[2011-05-04 23:07:06.501310] DEBUG[4460] chan_dahdi.c: Requested
indication -1 on channel DAHDI/33-1
[2011-05-04 23:07:06.501450] DEBUG[4460] channel.c: Planning to masquerade
channel DAHDI/33-1 into the structure of SIP/gxp823-00000009<ZOMBIE>
[2011-05-04 23:07:06.501587] DEBUG[4460] channel.c: Done planning to
masquerade channel DAHDI/33-1 into the structure of
SIP/gxp823-00000009<ZOMBIE>

end of debug log, phone all dead. asterisk died. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-05-04 06:16 alecdavis      Note Added: 0134411                          
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