Happened again this week, twice. Tonight I've closed all apps -the
laptop was responding, only the NetworkManager was locked up, frozen in
a half-turn of it's green slashes. In a terminal 'top' would list
wpa_supplicant as using 100% resources. Then I've chosen System / quit -
shutdown, and went through the shutdown procedure.

The ubuntu logo showed up, the slider run a bit, then the splash
disappeared and printed:

Avahi mDNS/DNS-SD Daemon avahi-daemon
  Failed to kill daemon: timer expired
umount2: Device or resource busy
umount: /dev/sda8 busy - remounted read-only
mount: /  is busy

After a while the words:

Will now halt

got appended, but the machine did NOT halt. I had to push the power
button for a few seconds for that.

I cannot "try out" gutsy because this is the laptop where I work. I am
willing though to try out a backport of Gutsy's wpa_supplicant. Also
next time it locks up I'll try to backtrace it.

-- 
wpa_supplicant locked up consuming 100% resources
https://bugs.launchpad.net/bugs/110158
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