Re: Crashes happen all the time

On Mon, Apr 26, 2010 at 03:21:51PM -0400, Federico Alves wrote:
> I need some help from the freetds gurus, maybe Frediano Ziglio?. Since I
> moved on to the Asterisk version 1.6, it crashes several times per day. The
> traces are in 
> https://issues.asterisk.org/view.php?id=17084
> 
> The Asterisk developers think that they are not responsible, and I don't
> know if I need to contact the makers of unixODBC or in fact the offending
> code is  in freetds.

> Program terminated with signal 11, Segmentation fault.
> ...
> (gdb) bt full
> #0  0x00002aaaaaccf4e5 in SQLDescribeCol () from /usr/lib64/libodbc.so.1
> No symbol table info available.

This is by definition a FreeTDS bug because FreeTDS triggered the segmentation fault.  Either the inputs to SQLDescribeCol() are valid and it should return valid results, or the inputs are invalid and it should produce an error.  

The trick will be to figure out what happened.  

Can you load the symbol table?  Then we could see the paramters passed and the exact line it failed on.  

If you can possibly get a TDSDUMP log and a backtrace for the same crash, we'd be able to see the column metadata as received from the server.  That might provide some insight into what went wrong.  

--jkl