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Subject: [Bug 222425] MBR broken after "gpart backup ada0 | gpart restore -F
 ada1"
Date: Mon, 18 Sep 2017 11:12:11 +0000
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X-Bugzilla-Component: bin
X-Bugzilla-Version: 11.1-RELEASE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: chris@cretaforce.gr
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222425

            Bug ID: 222425
           Summary: MBR broken after "gpart backup ada0 | gpart restore -F
                    ada1"
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: chris@cretaforce.gr

There is a problem with the MBR after running "gpart backup ada0 | gpart
restore -F ada1" and because of this it's not possible to boot using this d=
isk.

This issue happens only with FreeBSD 11.1 and maybe 11.0. It doesn't happen
with 10.3.

How to reproduce the issue:

gpart backup ada0 | gpart restore -F ada1
gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada1

Then boot using ada1 I see:

gptboot: invalid primary GPT header
gptboot: invalid backup GPT header
gptboot: unable to load GPT

The only workaround is copying the MBR from ada0 to ada1:

gpart backup ada0 | gpart restore -F ada1
dd if=3D/dev/ada0 of=3D/dev/ada1 bs=3D512 count=3D40
gpart recover ada1
gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada1

More information here:

https://forums.freebsd.org/threads/62376/

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