Bug #18037 Server crash when returning system variable in stored procedures

Description:
This error started to occur with 5.0.18, also shows up in 5.0.19 and 5.1.7.

It happens only in "debug" builds on PPC machines running OS X.

=====
sp                             [ fail ]

Errors are (from PATH/mysqltest-time) :
mysqltest: At line NNN: query 'select bug2674()' failed: 2013: Lost connection to MySQL server during query
(the last lines may be the most important ones)

Ending Tests
=====

5.0.18:
powermacg5-5.0-debug.log   normal
powermacg5-5.0-debug.log   ps-protocol
xserve-64bit-5.0-debug.log   normal
xserve-64bit-5.0-debug.log   ps-protocol

5.1.7:
powermacg5-5.1-community.log   debug
(no "xserve" now, machine is down)

5.0.19:
powermacg5-5.0-debug.log   normal
powermacg5-5.0-debug.log   ps
(no "xserve" now, machine is down)

How to repeat:
Test suite.

Sorry - I have to re-open this bug.
It re-occurred in the 5.0.20a builds.

Bug#19633 "Stack corruption in fix_fields()/THD::rollback_item_tree_changes()" has been marked as a duplicate of this bug.

Alik, please review the following changeset:

  http://lists.mysql.com/commits/6156

Thank you.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/6182

I committed a new patch, this one for 5.0.

The content of the patch is essentially identical to the previous one for 5.1.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/6377

Pushed to 5.0.22.

Pushed into 5.1.11.

For documentation purposes, Bug#19633 has a better description of the problem that is fixed with this bug.

Noted in 5.0.22, 5.1.11 changelogs.

Returning the value of a system variable from a stored
function caused a server crash.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/6559