From owner-freebsd-emulation@FreeBSD.ORG  Wed Jul 23 18:46:03 2008
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Date: Wed, 23 Jul 2008 20:44:50 +0200
From: Roman Divacky <rdivacky@FreeBSD.org>
To: "Sean C. Farley" <scf@FreeBSD.org>
Message-ID: <20080723184450.GA25356@freebsd.org>
References: <alpine.BSF.1.10.0807231236140.12600@thor.farley.org>
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Cc: freebsd-emulation@FreeBSD.org
Subject: Re: kern/122318 (CMake core dumping, chroot exiting)
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On Wed, Jul 23, 2008 at 12:50:51PM -0500, Sean C. Farley wrote:
> I am seeing if anyone has any insight on this PR (kern/122318[1]).  It
> would be nice to once again build using cmake within a Linux chroot.  :)
> 
> Basically, the bug is that not only that cmake is dumping core; it is
> also forcing the user out of the chroot environment.  Here is the
> command used to start the chroot:
> /compat/linux/usr/sbin/chroot <chroot path> su - <build user>
> 
> Thank you.
> 
> Sean
>   1. http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/122318

looking at the trace you provided I guess this is what's going
on:

cmake forks/execs gcc and waits to be notified about the success
of the command it tried, the notification comes (the SIGCHLD)
the handler tries do something and then returns and now something
is wrong and it receives the SIGSEGV..

or am I wrong and linux_ktrace does not translate signals and the
SIGCHLD is in fact SIGTSTP?

what is the fd 3 and 4? can you provide full ktrace.out?

thnx, roman