Bug #19170 Creating an event leads to 100% CPU usage.
Submitted: 18 Apr 2006 17:04 Modified: 6 May 2006 12:07
Reporter: Andrey Hristov Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server: Stored Routines Severity:S2 (Serious)
Version:5.1.9 OS:Any (All)
Assigned to: Andrey Hristov CPU Architecture:Any

[18 Apr 2006 17:04] Andrey Hristov
Description:
Creating an event leads to 100% CPU usage. The code that leads to this is existing the cloned 5.1.9 which is being built and not in any released code. I think the problem is quite serious. The fix is straightforward.

How to repeat:
mysql> use db1;
Database changed
mysql> create event xyz on schedule every 1 second do select 123;
Query OK, 1 row affected (0.05 sec)

mysql> set global event_scheduler = 1;
Query OK, 0 rows affected (0.05 sec)

mysql> set global event_scheduler = 0;
Query OK, 0 rows affected (0.00 sec)
[18 Apr 2006 17:14] Miguel Solorzano
Thank you for the bug report. I was able to repeat:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                          
11360 miguel    16   0 64864  31m 5408 S 97.4  6.7   0:42.71 mysqld
[18 Apr 2006 19:24] Bugs System
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/5102
[26 Apr 2006 15:22] Andrey Hristov
The patch was pushed but on Solaris10/AMD and PowerPC-G5 the test cases fails, on all other platforms passes. Leaving this open.
[26 Apr 2006 15:23] Andrey Hristov
..
[5 May 2006 11:31] Andrey Hristov
Fixed in 5.1.10
[6 May 2006 12:07] Jon Stephens
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:

Documented bugfix in 5.1.10 changelog. Closed.