Do you remember how to speed up your MySQL server using the Google Perftools? It seems that the amd64 flavour of these libraries makes MySQL crash.
I just bumped the version of the google-perftools packages for Lenny from 1.0 to 1.3. According to the Changelog they’re bringing a lot of bugfixes and improvements, and then enhance the stability of the daemons they’re plugged in.
Upgrading is highly recommended.
Update : The packages are now available for Etch.
Update #2 : Please desactivate the Google Perftools 1.3! They’re crashing MySQL. I’m rolling back to the old version (Etch : 0.98, Lenny : 1.0) until I fix (or Google) fix this issue. Really sorry for the mess…