Bug #46782 one ndbmtd crash with Err code 2341 when take a dbt2 test

Description:
Environment:
4 machines: 
2 IBM x3850m2(4cores*4,8GB mem) as one mgmd and two mysqlds, 2 IBM x3950m2(4cores*8, 32GB mem) as four ndbmtd nodes.
OS:
SuSE EnterpriseLinux SP2
MySQL Cluster:
mysql-com-5.1.35-ndb-7.0.6 for Linux x86_64
DBT2:
dbt2-0.37.45.tar.gz from http://www.iclaustron.com/

I run the following step:
./mysql_load_db.sh --database dbt2w5 --path /tmp/dbt2test --socket /tmp/mysql.sock --engine NDB

there is always one ndbmtd crash with the error info:
Time: Friday 14 August 2009 - 13:20:23
Status: Temporary error, restart node
Message: Internal program error (failed ndbrequire) (Internal error, programming error or missing error message, please report a bug)
Error: 2341
Error data: suma/Suma.cpp
Error object: SUMA (Line: 4121) 0x0000000a
Program: ndbmtd
Pid: 5887

How to repeat:
after builded the mysql cluster, then just run dbt2 test with above environments.

NOTE:
I had test mysql cluster with dbt2 many times, and I am sure I can take a right process.
I used dbt2-0.37.45 to test mysql-cluster-com-5.1.35-ndb-7.0.6(x86_64 version) on other Intel multi-core machines(4core*2,2core*2) and no problem.

Suggested fix:
I use real-time extend and multi-thread parameters on config.ini file, please refer to my config.ini file.
I think maybe there is a bug which happens when ndb-7.0.6 run on multi-core machines( No. of cores > 16).

one ndbmtd output log & error log and configuration files

Attachment: ndb_log.zip (application/x-zip-compressed, text), 358.11 KiB.

see bug#46123
see bug#46723
see bug#45612

proposed patch

Attachment: bug46782.patch (text/x-patch), 8.82 KiB.

Hi,

If you could retest with patch that I attached that would be great

/Jonas

I'm glad to hear from your and I'll test this patch.
thank you!

Thanks for the patch, Jonas.

Because my cluster-setup is in a production enviroment, I can't test the patch right now, escpacially not under load ... sorry!

Regards,
Robert

Hi raid (and rest),

Did you test the patch that I made for the bug?
I'm a bit in a hurry cause we have a 7.0.7 release scheduled for next week...

and I can only reproduce the problem my self by being really nasty:
- start ndbmtd with MaxExecutionThread=8 (on a 4-core machine)
- start high update load
- start big background load (compiling)

etc...but the patch fixed the problem in this scenario.

and i'm really keen on getting feedback

/Jonas

Sorry, This mysql cluster was deployed on our customer's production system, I was migrating some oracle data to mysql cluster data and so busy recently. Maybe I could test this patch in the next one or two week.

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/81378

2964 Jonas Oreland	2009-08-24
      ndb - bug#46782
        crash in SUMA.
        For each global checkpoint, schedule each thread running an LQH to prevent
          uneven load causing SUMA to overflow circular buffer

pushed to 7.0.7

Documented bugfix in the NDB-7.0.7 changelog as follows:

        During a global checkpoint, LQH threads could run unevenly, causing a
        circular buffer oveflow by the Subscription Manager, which led to data
        node failure.