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Date:      Mon, 19 Jul 2010 14:47:54 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        David Brodbeck <gull@gull.us>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: Samba gives "invalid PT_PHDR" after upgrading from 7.2-RELEASE to 7.3-RELEASE
Message-ID:  <20100719194754.GL5485@dan.emsphone.com>
In-Reply-To: <2e47f936a2985dda9c655b79c0f00091.squirrel@www.gull.us>
References:  <80AD3593-1170-4346-A4EE-4274085D6570@gull.us> <d835a692278fddb7977182fb267ed973.squirrel@www.gull.us> <001501cb1db5$b3db2240$1b9166c0$@wakefield.sch.uk> <6341639666e4d0c65cd1b29a89e64beb.squirrel@www.gull.us> <E121DFA5-78CC-4228-96FB-4CE94A5438B2@gull.us> <AANLkTilwoc-iURlyhtCKEWxdZaDDvTZZBxZqk07o4ZC1@mail.gmail.com> <2e47f936a2985dda9c655b79c0f00091.squirrel@www.gull.us>

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In the last episode (Jul 19), David Brodbeck said:
> On Mon, July 19, 2010 1:37 am, Timur I. Bakeyev wrote:
> > On Sun, Jul 18, 2010 at 10:42 PM, David Brodbeck <gull@gull.us> wrote:
> >> On Jul 7, 2010, at 10:12 AM, David Brodbeck wrote:
> >>> On Wed, July 7, 2010 2:20 am, mcoyles wrote:
> >>>> David - have a look here...
> >>>> http://lists.freebsd.org/pipermail/freebsd-current/2010-April/016405.html
> >>>
> >>> OK, I see.  It looks like rtld is part of world, not a port, so then
> >>> the question becomes, why didn't freebsd-update update it for me?   Is
> >>> there a way I can force a binary upgrade, or do I need to download the
> >>> source and rebuild things that way?
> >>
> >> I ended up downloading the 7.3 livefs ISO, booting off of it, and
> >> replacing /libexec/ld-elf.so.1 with the one from the CD.   That fixed
> >> the problem.
> >>
> >> I suspect the reason freebsd-update didn't upgrade it properly is it
> >> appears it's impossible to replace this file on a running system, even
> >> in single-user mode.   Maybe there should be something in the release
> >> notes about a 7.2 -> 7.3 upgrade being impossible to do properly except
> >> by booting from CD?
> >
> > make installworld happily does it, so can you - by renaming file to the
> > *.old and then putting new on in it's place.  So, it could be that
> > freebsd-update isn't sophisticated enough to do such a trick.
> 
> That doesn't work, unfortunately.  Once you rename ld-elf.so.1 to
> ld-elf.so.1.old, trying to run any further commands -- even mv and cp --
> fails with an error.  (I didn't write down which one; something about
> failing to load the ELF interpreter, I think.) I know, I managed to
> cripple my system that way.  I had to boot a LiveCD to recover, because it
> couldn't even load /bin/sh to get into single-user mode.

A better method would be to copy (not move) the file to a backup location,
then either use mv or install to install the new version.  Also, the
programs in /rescue/ are statically linked so they can be used to recover if
you end up losing ld-elf.so.1 or other critical shared libs.

-- 
	Dan Nelson
	dnelson@allantgroup.com



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