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Summary:ASTERISK-23297: Asterisk 12, pbx_config.so segfaults if res_parking.so is not loaded, or if res_parking.conf has no configuration
Reporter:CJ Oster (lordvadr)Labels:
Date Opened:2014-02-13 11:50:08.000-0600Date Closed:2014-02-15 21:32:01.000-0600
Priority:MajorRegression?
Status:Closed/CompleteComponents:PBX/pbx_config Resources/res_parking
Versions:12.0.0 Frequency of
Occurrence		Constant
Related
Issues:
Environment:CentOS 6.5, running as a KVM vm on top of a CentOS 5.10 cluster. Linux localhost 2.6.32-431.5.1.el6.x86_64 #1 SMP Wed Feb 12 00:41:43 UTC 2014 x86_64 x86_64 x86_64 GNU/LinuxAttachments:( 0) ASTERISK-23297-12.diff
( 1) backtrace.txt
Description:Pretty straight forward.  If you try to turn off parking, either by not loading the module, or commenting out the modules config, pbx_config (at least that's what it appears to do) segfaults on startup.  Below is the out put of 'asterisk -fvvvvvdddddd' when it crashes (I have removed all config from extensions.conf/ael/lua):

{noformat}
------------
<snip>
Loading pbx_config.so.
 == Parsing '/etc/asterisk/extensions.conf': Found
 == Setting global variable 'CONSOLE' to 'Console/dsp'
 == Setting global variable 'IAXINFO' to 'guest'
 == Setting global variable 'TRUNK' to 'DAHDI/G2'
 == Setting global variable 'TRUNKMSD' to '1'
(Segfault)
-------------
{noformat}

Here's the same section when it doesn't crash:

{noformat}
<snip>
Loading pbx_config.so.
 == Parsing '/etc/asterisk/extensions.conf': Found
 == Setting global variable 'CONSOLE' to 'Console/dsp'
 == Setting global variable 'IAXINFO' to 'guest'
 == Setting global variable 'TRUNK' to 'DAHDI/G2'
 == Setting global variable 'TRUNKMSD' to '1'
   -- Registered extension context 'parkedcalls'; registrar: res_parking/default
   -- merging incls/swits/igpats from old(parkedcalls) to new(parkedcalls) context, registrar = pbx_config
   -- Added extension '720' priority 1 to parkedcalls
   -- Added extension '719' priority 1 to parkedcalls
      (...etc...)
   -- Added extension '700' priority 1 to parkedcalls
   -- Time to scan old dialplan and merge leftovers back into the new: 0.002096 sec
   -- Time to restore hints and swap in new dialplan: 0.000003 sec
   -- Time to delete the old dialplan: 0.000012 sec
   -- Total time merge_contexts_delete: 0.002111 sec
pbx_config.so => (Text Extension Configuration)
(...continues to load normally...)
{noformat}

------------------
STEPS TO REPRODUCE
------------------
1) Freshly install system, and update.

2) Install asterisk yum repo.

3) Install asterisk and asterisk-config.

3.5) Remove all valid contexts from extensions.conf

4) Asterisk should start fine.

5) Add "noload => res_parking.so" to /etc/asterisk/modules.conf

6) Asterisk will now crash on startup.

7) Remove the noload, asterisk will start normally.

8) Comment out the 3 uncommented-lines in res_parking.conf

9) Asterisk will now crash on startup.

10) Repeat steps 5-9 as needed.
Comments:By: Matt Jordan (mjordan) 2014-02-13 12:32:55.406-0600

Thanks for reporting this bug. Do you mind attaching the backtrace from the crash you've had?

Instructions on generating a backtrace are on the Asterisk wiki here - https://wiki.asterisk.org/wiki/display/AST/Getting+a+Backtrace

By: CJ Oster (lordvadr) 2014-02-13 16:25:49.214-0600

Backtrace from crash as requested.
By: CJ Oster (lordvadr) 2014-02-13 16:27:07.103-0600

Backtrace attahed.

ALSO, I should point out that I discovered that you have to have an empty (e.g. no valid contexts) in extensions.conf to cause the crash.
By: Matt Jordan (mjordan) 2014-02-13 18:55:55.125-0600

So, right now I have:

* An empty {{extensions.conf}}
* An empty {{res_parking.conf}}

I'm using Asterisk 12 from the current SVN branch (r407875)

Starting Asterisk with {{res_parking}} - no crash. (modules are set to autoload)

Modifying {{modules.conf}} with a {{noload => res_parking.so}} - no crash.

I noticed that there was still some of the {{pbx_ael}} stuff loaded, so I added a {{noload => pbx_ael.so}} as well. Crash!

By: Matt Jordan (mjordan) 2014-02-13 19:15:34.855-0600

Attached is a patch that fixes the issue for me. If you could please test it, that'd be great.

With this patch, I was able to unload, noload, module load, and generally muck with things that provide dialplan - including {{pbx_ael}}, {{pbx_config}}, {{res_parking}} - all starting with no configuration.
By: CJ Oster (lordvadr) 2014-02-14 00:45:07.758-0600

Matt,

I neither have the man-power, nor the expertise to mix built vs. package-manged installations.  You are welcome to my VM's.  I'll find you on freenode tomorrow and you can have all the fun want with my VM's.