The /DEBUG file shows that modem-manager is still running, and at line 114 you can see that the init process has /var/log/upstart/modemmanager open for write. That explains the "mount: / is busy" message.
I would think that modem-manager should have exited before umountroot is run. Looking at /etc/init.d/sendsigs, it appears that processes associated with upstart jobs (like modemmanager) aren't killed, and I see no facility there for waiting on them to exit. I'm not an ubuntu developer, but if you care to try an experiment, you could try adding a sync command to line 64 of /etc/init.d/sendsigs . This is just before a comment that starts 'Upstart jobs have their own' and a sequence of code that collects the pids of upstart jobs into a list of pids to ignore (i.e. pids not to kill). If modem-manager or init are waiting on i/o to complete, a sync here might give modem-manager time to exit before it gets put into the OMITPIDS list. If you decide to change sendsigs, be sure to make a backup copy first: sudo cp -p /etc/init.d/sendsigs ~ Other than that, I don't have any new ideas. Let's hope that Mathieu or another one of the powers-that-be will now jump in with some suggestions as to how to proceed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/963106 Title: NetworkManager causes orphaned inodes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/963106/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
