From owner-freebsd-stable@FreeBSD.ORG  Wed Aug 23 11:17:44 2006
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From: Daniel Eischen <deischen@freebsd.org>
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To: "S.N.Grigoriev" <gregory@mdmspb.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: "_malloc_prefork" not found
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On Wed, 23 Aug 2006, S.N.Grigoriev wrote:

> Hi All,
>
> I've updated from amd64 6.1-RELEASE to 6-STABLE.
> All works fine. The only problem: when xmms or
> firefox starts the following message appears:
>
> /libexec/ld-elf.so.1: /lib/libpthread.so.2: Undefined symbol "_malloc_prefork"
>
> The Ports tree is fresh. Both xmms and firefox have been rebuilt.
> Who knows what have I do to fix the problem?

Your system is not consistent.  There is no _malloc_prefork()
(or _malloc_foofork()) in -stable; it only exists in -current.
You've got -current libraries (at least libpthread) on -stable.
libpthread is installed in /usr/lib in RELENG_6, not /lib.
So if you've downgraded from -current, you'll need to remove
the -current libraries that have different locations in
RELENG_6 (no, I don't think there is an automated way to do
this).

-- 
DE