It's apparmor. See /var/log/syslog
Aug 1 22:37:19 magna kernel: [119350.467189] type=1400 audit(1343853439.594:46): apparmor="DENIED" operation="mknod" parent=15003 profile="/usr/sbin/mysqld" name="/run/tmp/ibQJ1cz5" pid=15094 comm="mysqld
Note: I've symlinked /tmp to /run/tmp ...
To fix, edit: /etc/apparmor.d/usr.sbin.mysqld, and add:
/tmp/** rwk, /run/tmp/** rwk,
Maybe I could do without the last or with fewer rights, but I'm in a hurry...
It's apparmor. See /var/log/syslog
Aug 1 22:37:19 magna kernel: [119350.467189] type=1400 audit(134385343 9.594:46) : apparmor="DENIED" operation="mknod" parent=15003 profile= "/usr/sbin/ mysqld" name="/ run/tmp/ ibQJ1cz5" pid=15094 comm="mysqld
Note: I've symlinked /tmp to /run/tmp ...
To fix, edit: /etc/apparmor. d/usr.sbin. mysqld, and add:
/tmp/** rwk,
/run/tmp/** rwk,
Maybe I could do without the last or with fewer rights, but I'm in a hurry...