Sorry, bug is a -EPEBCAK. The disk was full, as can be seen in
/var/log/daemon.log. Thanks Oleg!
- Bug#910454: mysql-server: Restoring backup hangs for a l... Matthew Toseland
- Bug#910454: [debian-mysql] Bug#910454: mysql-server... Olaf van der Spek
- Bug#910454: Acknowledgement (mysql-server: Restorin... Matthew Toseland