Comment 22 for bug 317775

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Vassily Gavrilyak (gavrilyak) wrote :

It seemed to me that I have this bug too, everything looked the same in my case. I had "Asking all remaining processes to terminate... [fail]... Unmounting local file systems... mount: / is busy" and I have to press CTRL-ALT-DEL to reboot, whereupon it says "md: stopping all md devices" and completes the shutdown.

Then I removed "quiet splash" from kernel command line and I see kernel oops at shutdown. And this appears to be bug 318360 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/318360. It was caused by iwl3945 driver. Killing NetworkManager and wpa_supplicant before shutdown "fixed" that for me.