Sometimes, when I use 'gem' to install a package, say 'sudo gem install
dbi', gem uses up all my memory and CPU, and, if I can't manage to
arrive at a terminal and do 'sudo killall -9 ruby', I'm left with no
choice but reboot my Ubuntu box.

I'm using Ruby 1.8, gem 0.9.0.

I tried with the '--debug' switch, but it writes nothing while it's
"stuck".
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