Comment 4 for bug 609743

Hi,

thanks for reporting this bug. Based on the attached logfiles it looks
like apparmor refused mysql read access to a /sys file it expected to be
able to read. However, you say "suddenly the kernel seems like stuck and
hang" which would sound much more serious. Can you please confirm whether
or not you are able to log into the machine?

So long as you can log into the machine, we can confirm whether there is
any other problem by temporarily disabling apparmor for mysql, by doing:

    cd /etc/apparmor.d/disable
    ln -s ../usr.sbin.mysqld
    service apparmor restart
    service mysql restart

and seeing whether mysql is now able to start.