[asterisk-dev] [Code Review] 4342: CHANNEL(peer), chan_iax2, res_fax, SNMP agent: Fix deadlock from reaching across a bridge.

[rmudgett]

-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviewboard.asterisk.org/r/4342/
-----------------------------------------------------------

(Updated Jan. 20, 2015, 10:46 a.m.)


Status
------

This change has been marked as submitted.


Review request for Asterisk Developers.


Changes
-------

Committed in revision 430817


Bugs: ASTERISK-24600
    https://issues.asterisk.org/jira/browse/ASTERISK-24600


Repository: Asterisk


Description
-------

Calling ast_channel_bridge_peer() cannot be done while holding any channel
locks.  The reported issue hit the deadlock in chan_iax2, but an audit of
the ast_channel_bridge_peer() calls found three more locations where the
same deadlock can occur.

* Made CHANNEL(peer), res_fax, and the SNMP agent not call
ast_channel_bridge_peer() with any channel locked.  For CHANNEL(peer) I
had to rework the logic to not hold the channel lock.

* Made chan_iax2 no longer call ast_channel_bridge_peer().  It was done
for legacy reasons that no longer apply.

* Removed the iax.conf forcejitterbuffer option.  It is now always enabled
when the jitterbuffer option is enabled.  If you put a jitter buffer on a
channel it will be on the channel.


Diffs
-----

  /branches/13/res/snmp/agent.c 430688 
  /branches/13/res/res_fax.c 430688 
  /branches/13/funcs/func_channel.c 430688 
  /branches/13/configs/samples/iax.conf.sample 430688 
  /branches/13/channels/chan_iax2.c 430688 
  /branches/13/UPGRADE.txt 430688 

Diff: https://reviewboard.asterisk.org/r/4342/diff/


Testing
-------

Testsuite tests still pass for FAX.  The full testsuite didn't hit any deadlock.


Thanks,

rmudgett

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.digium.com/pipermail/asterisk-dev/attachments/20150120/9b12e3c6/attachment.html>