NetBSD Problem Report #53291

From martin@aprisoft.de  Wed May 16 08:25:20 2018
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Message-Id: <20180516082510.4A6575CC8C7@emmas.aprisoft.de>
Date: Wed, 16 May 2018 10:25:10 +0200 (CEST)
From: martin@NetBSD.org
Reply-To: martin@NetBSD.org
To: gnats-bugs@NetBSD.org
Subject: GPT prevents installation
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>Number:         53291
>Category:       install
>Synopsis:       GPT prevents installation
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 16 08:30:00 +0000 2018
>Last-Modified:  Thu May 17 11:40:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.0_RC1
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD emmas.aprisoft.de 8.0_BETA NetBSD 8.0_BETA (EMMAS) #1: Fri Mar 2 13:16:40 CET 2018 martin@emmas.aprisoft.de:/var/nbsd/src-8/sys/arch/i386/compile/EMMAS i386
Architecture: i386
Machine: i386
>Description:

Sysinst is unable to install onto a disk that already has a GPT, even if
using MBR in full-disk-for-NetBSD mode and creating new partitions.

>How-To-Repeat:

On a scratch machine (or VM), boot into the RC1 installer (e.g. from CD image).
Use utility menu to run /bin/sh.

do:
  gpt destroy wd0
  gpt create wd0
  reboot

Boot into the installer again, do a standard installatin with full disk
for NetBSD, create new partition, accept all defaults.

After finishing the installer, remove installer medium and try to boot
from wd0 - it will fail (no PBR has been written, GPT protective MBR still
in place).

>Fix:
Should happen in sysinst. Manual workaround:

Go to utility, run /bin/sh, then do:

 > dd if=/dev/zero of=/dev/rwd0d count=100

Exit back to sysinst, go to main menu and do the installation.

>Audit-Trail:
From: Robert Elz <kre@munnari.OZ.AU>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: install/53291: GPT prevents installation
Date: Wed, 16 May 2018 17:56:38 +0700

     Date:        Wed, 16 May 2018 08:30:00 +0000 (UTC)
     From:        martin@NetBSD.org
     Message-ID:  <20180516083000.667B97A232@mollari.NetBSD.org>

   | After finishing the installer, remove installer medium and try to boot
   | from wd0 - it will fail (no PBR has been written, GPT protective MBR still
   | in place).

 It really needs more than that - it should be able to make (if needed) an
 EFI partition, and install the UEFI version of /boot there.

 Of course, on most systems UEFI booting doesn't work (not the boot program's
 problem, or the setup, all that works fine (done manually) - but the kernel fails
 as much of  the hardware doesn't get configured).   So, I don't think this is really
 an issue for NetBSD 8 - but whoever works on this PR should really also
 consider UEFI as well as legacy booting, and make sysinst able to do it both
 ways (and not necessarily one or the other - installing both methods is 
 possible, then the firmware can pick which it wants to use.)

 kre



From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: install/53291: GPT prevents installation
Date: Wed, 16 May 2018 13:06:46 +0200

 On Wed, May 16, 2018 at 11:00:01AM +0000, Robert Elz wrote:
 >  It really needs more than that - it should be able to make (if needed) an
 >  EFI partition, and install the UEFI version of /boot there.

 Yes, of course, but there are other things to fix first.

 This is about trying to install a MBR labeld disk and failing silently,
 ending up with a strange "No bootable system found" message.

 Martin

From: John Nemeth <jnemeth@cue.bc.ca>
To: gnats-bugs@NetBSD.org, install-manager@netbsd.org, gnats-admin@netbsd.org,
        netbsd-bugs@netbsd.org
Cc: 
Subject: Re: install/53291: GPT prevents installation
Date: Wed, 16 May 2018 18:57:03 -0700

 On May 16,  8:30am, martin@NetBSD.org wrote:
 }
 } >Number:         53291
 } >Synopsis:       GPT prevents installation
 } >Arrival-Date:   Wed May 16 08:30:00 +0000 2018
 } >Originator:     Martin Husemann
 } >Release:        NetBSD 8.0_RC1
 } >Organization:
 } The NetBSD Foundation, Inc.
 } >Environment:
 } System: NetBSD emmas.aprisoft.de 8.0_BETA NetBSD 8.0_BETA (EMMAS) #1: Fri Mar 2 13:16:40 CET 2018 martin@emmas.aprisoft.de:/var/nbsd/src-8/sys/arch/i386/compile/EMMAS i386
 } Architecture: i386
 } Machine: i386
 } >Description:
 } 
 } Sysinst is unable to install onto a disk that already has a GPT, even if
 } using MBR in full-disk-for-NetBSD mode and creating new partitions.
 } 
 } >How-To-Repeat:
 } 
 } On a scratch machine (or VM), boot into the RC1 installer (e.g. from CD image).
 } Use utility menu to run /bin/sh.
 } 
 } do:
 }   gpt destroy wd0
 }   gpt create wd0
 }   reboot
 } 
 } Boot into the installer again, do a standard installatin with full disk
 } for NetBSD, create new partition, accept all defaults.
 } 
 } After finishing the installer, remove installer medium and try to boot
 } from wd0 - it will fail (no PBR has been written, GPT protective MBR still
 } in place).

      Is this possible confustion with a UEFI disk as UEFI doesn't use
 PBRs?  GPT with UEFI and GPT without UEFI use considerably different
 mechanims to boot.

 } >Fix:
 } Should happen in sysinst. Manual workaround:
 } 
 } Go to utility, run /bin/sh, then do:
 } 
 }  > dd if=/dev/zero of=/dev/rwd0d count=100
 } 
 } Exit back to sysinst, go to main menu and do the installation.
 } 
 }-- End of excerpt from martin@NetBSD.org

From: Martin Husemann <martin@duskware.de>
To: John Nemeth <jnemeth@cue.bc.ca>
Cc: gnats-bugs@NetBSD.org
Subject: Re: install/53291: GPT prevents installation
Date: Thu, 17 May 2018 13:35:28 +0200

 On Wed, May 16, 2018 at 06:57:03PM -0700, John Nemeth wrote:
 >      Is this possible confustion with a UEFI disk as UEFI doesn't use
 > PBRs?  GPT with UEFI and GPT without UEFI use considerably different
 > mechanims to boot.

 This happens when attemtping to create a legacy boot environment with
 the installer, but the disk already has a GPT (for whatever reasons).
 The recipe in the "how to repeat" section perfectly reproduces it for
 me (but we have already seen reports of the same symptoms in the wild).

 Martin

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