[sr-dev] Kamailio 3.1.4 Crash

[Brandon Armstead]

Timo,

   Thanks for solving this one!

On Aug 15, 2011, at 2:31 AM, Timo Reimann <timo.reimann at 1und1.de> wrote:

> Hey,
> 
> 
> On 09.08.2011 18:25, Timo Reimann wrote:
>> On 09.08.2011 17:54, Brandon Armstead wrote:
>>>   Looks like I spoke too soon!   It is still happening.
>>> 
>>> Any additional thoughts?  All and any help is greatly appreciated.
>> 
>> My original theory with Anton's issue was (and still is) that the dialog
>> module is trying to touch a dialog which has already terminated. When
>> provoking things like that through modifications in the dialog module,
>> we encountered crashes at similar locations in the code.
> 
> Git commit 7afb2cf8e fixes the issue. The cause was a race condition
> (most likely only manifesting when storing dialogs in the database in
> real-time) in conjunction with some awkward call flow behavior that
> would lead to the dialog timer list being messed up in rare situations.
> In consequence, this let to incorrect reference counting and, in turn,
> premature dialog termination.
> 
> Along the way, we found another related bug that would cause the
> "dlg_list" fifo command to crash Kamailio in certain situations when
> dialogs were restored from database. Commit ab21b2565 fixes this.
> 
> Major credits go to Brendon Armstead for giving out constant
> information, feedback, and overall assistance!
> 
> 
> Cheers,
> 
> --Timo