FreeTDS Crash: free(): invalid next size (fast)

My platform:

Ubuntu 10.04
Python 2.6.5
UnixODBC 2.2.11-21
pyodbc 2.1.8
SQLAlchemy 0.6.6

I can run simple tests scripts without a problem.  However, I have 
experienced some kind of crash doing some unit tests on a Python web 
application.

The error appears with both the FreeTDS version that ships with my 
distro (0.82-1build6) as well as a CVS version I compiled myself.

Here is the error in context of some SQLAlchemy debugging output:

> 2011-04-07 10:48:42,514 INFO sqlalchemy.engine.base.Engine.0x...a350 
> SELECT auth_users.id AS auth_users_id, auth_users.createdts AS 
> auth_users_createdts, auth_users.updatedts AS auth_users_updatedts, 
> auth_users.username AS auth_users_username, 
> auth_users.username_inactive AS auth_users_username_inactive, 
> auth_users.authsrc_uid AS auth_users_authsrc_uid, 
> auth_users.alternate_uid AS auth_users_alternate_uid, 
> auth_users.name_first AS auth_users_name_first, auth_users.name_middle 
> AS auth_users_name_middle, auth_users.name_last AS 
> auth_users_name_last, auth_users.phone AS auth_users_phone, 
> auth_users.email AS auth_users_email, auth_users.inactive_flag AS 
> auth_users_inactive_flag, auth_users.inactive_date AS 
> auth_users_inactive_date, auth_users.password_expires AS 
> auth_users_password_expires, auth_users.wfh_flag AS 
> auth_users_wfh_flag, auth_users.wfh_ca_key AS auth_users_wfh_ca_key, 
> auth_users.wfh_ext_reason AS auth_users_wfh_ext_reason, 
> auth_users.wfh_ext_url AS auth_users_wfh_ext_url, 
> auth_users.wfh_ext_link_text AS auth_users_wfh_ext_link_text, 
> auth_users.auth_source_id AS auth_users_auth_source_id
> FROM auth_users
> WHERE auth_users.id = ?
> 2011-04-07 10:48:42,514 INFO sqlalchemy.engine.base.Engine.0x...a350 (1,)
> 2011-04-07 10:48:42,527 INFO sqlalchemy.engine.base.Engine.0x...a350 
> INSERT INTO corporate_sessions (createdts, updatedts, id, hits, 
> relatedip, user_id) VALUES (?, ?, ?, ?, ?, ?)
> 2011-04-07 10:48:42,528 INFO sqlalchemy.engine.base.Engine.0x...a350 
> (datetime.datetime(2011, 4, 7, 10, 48, 42, 527866), None, 
> u'd2f8bb5f5w7njUnTDy0s', 0, '10.121.113.107', 1)
> *** glibc detected *** 
> /home/rsyring/dev/customers/pai/paiauth-venv/bin/python: free(): 
> invalid next size (fast): 0x0000000004029b40 ***
> free(): invalid next size (fast): 0x0000000004029b40 ***

I then have to kill the process.

The TDS dumps are here:

http://rcs-comp.com/tmp/freetds-091CVS.log
http://rcs-comp.com/tmp/freetds-082.log

I haven't taken the time to try and narrow down the test case because I 
am hoping the dumps will be sufficient to track down the problem.  
However, if needed, I can try to do that, its just going to be difficult 
b/c its buried in test setup.

-- 
--------------------------------------
Randy Syring
Intelicom
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Office: 502-212-9913

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