Comment 11 for bug 1073433

This looks to be the same issue as I was experiencing during 12.10 development:

http://old.nabble.com/ext4-recovery-deleted-orphans-on-reboot...-td34475175.html

Journal recovery occurs 100% of the time; list of orhpan inodes presumably depends on the amount of unlinking in the last 5 seconds before shutdown. Oddly enough, I don't observe this on my work desktop running Ubuntu 12.10, but I do see this on three laptops - also with Ubuntu 12.04. I'll double-check this.