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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 13 Sep 2005 10:26:34 -0400
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Cc: freebsd-questions@freebsd.org
Subject: Re: Can't run "make buildworld"
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epf1@cec.wustl.edu writes:

> So I have an odd problem with a FreeBSD box of mine.
> 
> It's a 6.0 Beta3 box upgraded from 5.4 and it can't seem to
> run "make buildworld" and only "make buildworld". I can run \
> "make cleandir" & "make cleanworld" & even "make kernel". I
> can build other things from the ports tree as well.
> 
> When I run "make buildworld" there is no output returned to the
> screen, I have even left "building" overnight & got nothing, no
> errors at all. The system does create the following path:
> 
> /usr/obj/usr/src/tools/build/make_check
> 
> but that is all the activity I can tell has happened.
> 
> The system is running FreeBSD 6.0-BETA3 #0 and was compiled on
> Mon Aug 29th. The system has been cvsup'ed since then.
> 
> Any ideas or suggestions on where to start troubleshooting
> this would be appreciated.

Pretty odd, indeed.

Try truss and ptrace, for a start.  
And look at top to see what's happening from a wider perspective.