Bug#619295: update-manager-gnome: Freeze with great load of CPU

[Greg Smith]

Same thing here.  The GUI process is completely unresponsive, and 
killing it via the close button and the "Force quit" menu only cleans up 
half the mess.  The GUI dialog box goes away, but the process gobbling 
up CPU is still there.  Have to kill it manually to recover.

I can get the same problem but without as many layers in the middle 
(like no gtk-su) by running this as root:

# strace -f /usr/bin/python /usr/bin/update-manager

The only thing I'm seeing happen while the program is spinning in the 
background is this printing periodically:

[pid 29137] poll([{fd=7, events=POLLIN}, {fd=9, events=POLLIN|POLLPRI}, 
{fd=11, events=POLLIN|POLLPRI}, {fd=12, events=POLLIN}, {fd=13, 
events=POLLIN}, {fd=14, events=POLLIN|POLLPRI}, {fd=15, 
events=POLLIN|POLLPRI}], 7, 29970) = 0 (Timeout)

Attaching the log file from that run in case that's any help.  
Eventually I terminated it with control-C, you can see that signal near 
the end.  It had been stuck for a few minutes at that point, so whatever 
is getting confused had already happened before then.

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