I'm experiencing this 100% CPU problem using Intrepid (fast-user-switch-
applet  2.24.0-0ubuntu6).  The problem happens when I switch from my
user to some other user, but not every time or to any pattern I can so
far work out.  I typically keep my session logged in for days while
other users of the machine log in and out more often.  This machine has
3-4 active users, all local no NIS/LDAP being used.

While the process is using 100% CPU, strace shows it is constantly
trying and failing to read a file, over and over.  Here's a small
portion of the output.  Next time it happens I'll connect gdb and see if
I can get any more information.

read(21, 0xbf972089, 1)                 = -1 EAGAIN (Resource temporarily 
unavailable)
read(3, 0x8752894, 4096)                = -1 EAGAIN (Resource temporarily 
unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=8, 
events=POLLIN|POLLPRI}, {fd=11, events=POLLIN|POLLPRI}, {fd=12, 
events=POLLIN|POLLPRI}, {fd=13, events=POLLIN|POLLPRI}, {fd=15, 
events=POLLIN|POLLPRI}, {fd=14, events=POLLIN|POLLPRI}, {fd=16, 
events=POLLIN|POLLPRI}, {fd=17, events=POLLIN|POLLPRI}, {fd=19, events=POLLIN}, 
{fd=18, events=POLLIN|POLLPRI}, {fd=10, events=POLLIN}, {fd=20, 
events=POLLIN}], 14, 0) = 0

-- 
fast user switch applet hangs on login making desktop unusuable
https://bugs.launchpad.net/bugs/291505
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