I gave been trying to solve this for few days now, and cant seem to figure this out.

I have been trying to set log rotation for mysql slow using linux logrotate feature, and my script seems to get stuck on mysqladmin flush-logs. So I logged into mysql and just entered FLUSH LOGS;. Not surprisingly I get an error:

mysql> flush logs;
ERROR 1105 (HY000): Unknown error

Now I have been going around asking for ideas, but none seem to work, its not permissions, not owners, not SELinux

I know that there used to be some bug, like in 2005 or 2008 ... but its 2012, I assume its fixed.

So if anyone has any ideas, would be much appreciated.

  • 1
    You might not be able to assume the bug is fixed... try to track down a bug report and check the status.
    – Matt Healy
    Apr 11, 2012 at 11:03
  • Two questions : 1) What version of MySQL are you using? 2) Did you recently upgrade? Apr 11, 2012 at 15:35
  • MySQL version - 5.5.21. I did not upgrade recently. OS: CentOS - 6 . Kernel 2.6.32-220.7.1.el6.x86_64
    – Katafalkas
    Apr 11, 2012 at 16:11
  • Next two questions: Did you ever run flush logs before? If you did, did you get this same error message ERROR 1105 (HY000): Unknown error ? Apr 11, 2012 at 20:18
  • Let me restart my previous question: You have MySQL 5.5.21. Did you recently upgrade to MySQL 5.5.21 from a previous version ??? Apr 11, 2012 at 20:21

2 Answers 2


If you are running MySQL on Debian 6 squeeze stable with vMySQL-5.5 then there is a known issue mentioned about dotdeb packaging:



You might try setting the permissions for one error-log file. You find the location using:

echo "show global variables like 'log_error';" | mysql -u root -p

And the fix is as trivial as

chown mysql $error_log_file

Worked for me on Ver 14.14 Distrib 5.5.50, for debian-linux-gnu Found at http://forums.mysql.com/read.php?20,584361

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