MySQL Bugs: #6441: Aggregate UDF in multi-table query crashes MySQL when returning multiple rows

Bug #6441	Aggregate UDF in multi-table query crashes MySQL when returning multiple rows
Submitted:	4 Nov 2004 20:30	Modified:	25 Nov 2004 12:20
Reporter:	Jon Wagoner	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: User-defined functions ( UDF )	Severity:	S1 (Critical)
Version:	4.1.7	OS:	Linux (Linux)
Assigned to:	Ramil Kalimullin	CPU Architecture:	Any

Description:
I have a UDF that I've been using in MySQL 4.0.21.  I upgraded our dev server to MySQL 4.1.7, and it now crashes the server.  This only happens on multi-table queries, and only when the query returns more than one row.  To see if it was just my code, I tried the avgcost example UDF, and got the same behavior.

How to repeat:
1. Create test data and load avgcost UDF into Mysql.
2. Execute query
3. Server crashes

trace log

Attachment: mysqld.trace.gz (application/x-gzip, text), 26.38 KiB.

SQL dump of test data

Attachment: testdata.sql (application/octet-stream, text), 1.86 KiB.

Error log

Attachment: mysqld.err (application/octet-stream, text), 1.85 KiB.

Resolved backtrace from error log

Attachment: mysqld.resolved (application/octet-stream, text), 612 bytes.

The query I used to crash the server is:

SELECT avgcost(test1.field1, test1.field3) FROM test1, test2 WHERE test2.field2 = test1.field2 GROUP BY test1.field2;

Thank you for the bug report I was able to repeat with latest
BK source.

Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at
    http://www.mysql.com/doc/en/Installing_source_tree.html

Additional info:

fixed in 4.1.8