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From: George Hartzell <hartzell@alerce.com>
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Date: Tue, 26 May 2009 09:10:19 -0700
To: Artis Caune <artis.caune@gmail.com>
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Cc: Philipp Wuensche <cryx-freebsd@h3q.com>,
	FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>
Subject: Re: loader not working with GPT and LOADER_ZFS_SUPPORT
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Artis Caune writes:
 > 2009/5/26 Philipp Wuensche <cryx-freebsd@h3q.com>:
 > > Hi,
 > >
 > > I tried booting from a disk with GPT scheme, with a /boot/loader build
 > > with LOADER_ZFS_SUPPORT="yes" in make.conf. I get the following error:
 > >
 > > panic: free: guard1 fail @ 0x2fd4a6ac from
 > > /usr/src/sys/boot/i386/libi386/biosdisk.c:1053
 > 
 > Same problem for me. I also tried with MBR scheme, same problem.

I had a similar problem (different @ 0x.... address) with -STABLE over
the weekend.  I just wanted to boot an old fashioned system, MBR and
no ZFS.  I ended up building a loader with

  LOADER_ZFS_SUPPORT="NO"
  LOADER_NO_GPT_SUPPORT="YES"

and it worked.

g.