[SR-Users] xmlrpc crash

[Daniel-Constantin Mierla]

On 03/05/16 09:01, Juha Heinanen wrote:
> Daniel-Constantin Mierla writes:
>
>> These ones are no longer related to xmlrpc, but triggered by an sqlops
>> query - first bracktrace, the other two are during the signal
>> handling.
> OK, but there must be some kind of relation to xmlrpc, because I have
> had this same test system running without any problems for months and
> now suddenly I started to experience crashes, which happen always after
> xmlrpc queries.
>
>> The one for sqlops leads quite a bit inside the libmysqlclient, which
>> can happen because there is a buffer overflow in kamailio for the
>> operations in the system memory or an issue in the libmysqlclient.
>>
>> Trying to investigate on the first option -- does it happen always after
>> an xmlrpc command? If yes, it is any kind of command or a specific
>> xmlrpc command (I see you used htable.reload)?
> Yes.  I made another test.  I sent three xmlrpc queries (htable.reload)
> and got crash after the third.  Why after third could be explained by
> this sql_query that gets executed once per minute:
>
> route [cleaner] {  # Clean old statistics from database
>     sql_query_async("sip_proxy_usage", "DELETE FROM statistics WHERE (unix_timestamp() - time_stamp) > 86400");
> }
>
> So xmlrpc query or queries did something and that something triggered
> subsequent sql_query to crash.
>
What is the version of kamailio running there?

xmlrpc is compiled by default to use system memory manager (expecting to
need big chunks for some responses), can you recompile it to use the
pkg? You have to edit modules/xmlrpc/Makefile and remove the line:

DEFS+=-DXMLRPC_SYSTEM_MALLOC

If there is a buffer overflow, it should be easier to catch using the
internal memory manager checks -- some error messages should be printed
inside the syslog as well.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, Berlin, May 18-20, 2016 - http://www.kamailioworld.com

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