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Date:      Sun, 04 Dec 2022 18:49:58 +0000
From:      bugzilla-noreply@freebsd.org
To:        doc@FreeBSD.org
Subject:   [Bug 268100] 13.1's loader.efi is not able to find a ZFS pool if it was checkpointed on 12.3
Message-ID:  <bug-268100-9-5i4EkBoX21@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-268100-9@https.bugs.freebsd.org/bugzilla/>
References:  <bug-268100-9@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D268100

--- Comment #2 from ml@netfence.it ---
(In reply to Warner Losh from comment #1)

First off, there are no "characteristics of the ZFS snapshot": we are talki=
ng
about "zpool checkpoint", not "zfs snap".

I have no idea on why loader.efi can't boot from a checkpointed ZFS pool:=20
I only saw the message above ("can not read checkpoint data").

I don't have the original problematic pool anymore: it was a production ser=
ver
and I needed to boot it ASAP, so I just issued "zpool checkpoint -d" (that =
is,
as soon as I relized what the problem was).
I guess, in order to recreate the situation, procedure would be: install 12=
.3
UEFI+ZFS, checkpoint, upgrade to 13.1 (maybe upgrading boot loader is enoug=
h).
The only thing I could add is it was a zraid5 pool (3 disks); not sure it
matters.

Importance is "less than bulk" to me: it would have saved me three hours of
spreading panic if I had known; now I'll simply check if a checkpoint exists
before upgrading (or, if I forget, boot from an USB key and remove it later=
).
My only goal was to let other people know, so maybe they won't be hit so ha=
rd
by this.

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