[Bug 222425] GPT broken after "gpart backup ada0 | gpart restore -F ada1"

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222425

Warren Block <wblock at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |wblock at FreeBSD.org

--- Comment #10 from Warren Block <wblock at FreeBSD.org> ---
I'm seeing this also when trying to switch from a 64G to 200G virtual disk in a
VirtualBox VM.

If I use gpart backup | gpart recover to copy the partition information, then
delete and recreate the later partitions as larger ones, then write the
bootcode, I get the

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

flickering and repeating quickly on the VM console.  Rewriting the bootcode
again with gpart bootcode -b /boot/pmbr -p /boot/gptboot does not fix it, nor
does setting the disk active.  sha256 checksums on the boot partitions showed
the working and non-working disks were identical.  gpart says the old and new
disk partition tables are valid, but the new one does not boot.

Doing a gpart destroy -F on the new disk and manually creating partitions and
writing bootcode works, and the drive boots normally.

I have not tested on physical hardware.

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