I don't think it is Racket related. I'v experienced a few 100% cpu lockups on the latest Ubuntu, including once or twice when building Racket. I just built the latest HEAD from git without any issue. <div class="gmail_quote"> On Sun, Jun 24, 2012 at 2:36 PM, Danny Yoo <<a href="mailto:dyoo@hashcollision.org" target="_blank">dyoo@hashcollision.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I'm trying to install Racket 5.2.1 on my shiny new Ubuntu box, and am encountering some strangeness when doing 'make install'. It appears to get stuck doing the documentation build for macro-debugger. ############################### ... raco setup: 2 making: lang/private raco setup: 2 making: launcher raco setup: 2 making: launcher/tests raco setup: 2 making: lazy raco setup: 2 making: lazy/lang raco setup: 2 making: macro-debugger ############################### The CPU's pegged at 100% at this point, but I see no progress otherwise. What else can I do to help debug this? ____________________ Racket Users list: <a href="http://lists.racket-lang.org/users" target="_blank">http://lists.racket-lang.org/users</a> </blockquote></div>