MySQL Bugs: #48281: mysqlbinlog prints warning about unfreed memory

Bug #48281	mysqlbinlog prints warning about unfreed memory
Submitted:	24 Oct 2009 14:08	Modified:	24 Oct 2009 20:56
Reporter:	Sergey Petrunya	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: Command-line Clients	Severity:	S3 (Non-critical)
Version:	5.1	OS:	Linux (x86 Ubuntu Jaunty)
Assigned to:	Assigned Account	CPU Architecture:	Any

Description:
Running mysqlbinlog with --debug option causes the following warning to be produced:

Warning: Memory that was not free'ed (456 bytes):
	   456 bytes at 0x86f84d8, allocated at line  201 in 'my_alloc.c'

How to repeat:
Start a server with the following arguments: 

  ./mysqld --log-bin --server-id=1  

Connect with a client and run these statements:

 create database j221;
 use j221;
 create table t1 (a int);
 insert into t1 values (1000);
 flush logs;

Then run

./client/mysqlbinlog -uroot --debug  --verbose --base64-output=decode-rows -R -t --start-position=0 --host=localhost  pslp2-bin.000024

(pslp2-bin.000024 is the name of the next-to-last binary log)

And see the SQL output, followed by:
Warning: Not freed memory segments: 1
Warning: Memory that was not free'ed (456 bytes):
	   456 bytes at 0x86f84d8, allocated at line  201 in 'my_alloc.c'

Suggested fix:
I haven't investigated it in detail, but it seems that the contents of the binary log are irrelevant - one gets the same warning every time.

Although not freeing 456 bytes is harmless, the warning should be avoided so it doesn't obscure possible real problems.

Thank you for the bug report. Verified as described.

# at 4
#691231 21:00:00 server id 1  end_log_pos 0 	Rotate to laras-bin.000002  pos: 4
# at 4
#091024 18:47:02 server id 1  end_log_pos 106 	Start: binlog v 4, server v 5.1.41-debug-log created 091024 18:47:02
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
Warning: Not freed memory segments: 1
Warning: Memory that was not free'ed (452 bytes):
	   452 bytes at 0xf7e798, allocated at line  201 in 'my_alloc.c'
miguel@laras:~/dbs$