Re: Segmentation Fault in error handler

Did some more digging into this today.

The problem appears to be related to the error handler defined in
handlers.c.
It reaches the code where it prints out the "DB-LIBRARY error:\n\t%s\n"
message string and the core dumps at some point after that.

Once I commented out the "dberrhandle(err_handler);" line in fisql.c so it
doesn't invoke the error handler defined in handlers.c, the segmentation
fault/core dump stopped occurring when an error is raised.

Now to figure out what it is about the error handler that's causing the
core dump.

-Ray

===============================================
Ray Rankins
[email protected]
(518) 474-1094




From:	Raymond R Rankins <[email protected]>
To:	FreeTDS Development Group <[email protected]>
Date:	05/11/2011 06:09 PM
Subject:	Re: [freetds] Segmentation Fault in error handler
Sent by:	[email protected]




Attached is the tdsdump file.

-Ray

(See attached file: freetds.log)



From:		 Igor Korot <[email protected]>
To:		 FreeTDS Development Group <[email protected]>
Date:		 05/11/2011 05:44 PM
Subject:		 Re: [freetds] Segmentation Fault in error handler
Sent by:		 [email protected]



Hi,
Could you try to produce the TDSDUMP or run under gdb to see the backtrace?

Thank you.

On Wed, May 11, 2011 at 1:24 PM, Raymond R Rankins
<[email protected]> wrote:
>
> Sorry, forgot to mention, I'm running TDS version .91RC2
>
> Sybase TDS protocol version 5.0
> SQL Server TDS protocol version 8.0
>
> -Ray
>
>
>
>
> From:   Raymond R Rankins <[email protected]>
> To:     FreeTDS Development Group <[email protected]>
> Date:   05/11/2011 04:12 PM
> Subject:        [freetds] Segmentation Fault in error handler
> Sent by:        [email protected]
>
>
>
> I'm testing out fisql to run some queries and when there's an error with
> severity > 10 which invokes the error handler, it's causing a
segmentation
> fault and dumping the core.
> This is happening if I connect to SQL Server or to Sybase.
>
> Below are examples of what's happening:
>
> Error raised in SQL Server
> ----------------------------------------------
> Msg 2812, Level 16, State 62:
> Server 'CHPLUSSQL01', Line 1:
> Could not find stored procedure 'sp_modifystats'.
> DB-LIBRARY error:
>        General SQL Server error: Check messages from the SQL Server
> Segmentation Fault - core dumped
>
>
> Error raised in Sybase
> ----------------------------------------------
> Msg 2812, Level 16, State 5:
> Server 'CHPDEV', Line 1:
> Stored procedure 'sp_modstats' not found. Specify owner.objectname or use
> sp_help to check whether the object exists (sp_help may produce lots of
> output).
>
> DB-LIBRARY error:
>        General SQL Server error: Check messages from the SQL Server
> Segmentation Fault - core dumped
>
>
> My guess is this may be an issue with the default error handler in dblib?
>
> -Ray
>
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[attachment "graycol.gif" deleted by Raymond R
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