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From:   Josef Bacik <josef@toxicpanda.com>
Date:   Tue, 31 May 2022 22:10:49 -0400
Message-ID: <CAEzrpqc_sCu18+tfP9E1Z3+kj70ss7nH-YTnEu0Rw_QQxPWTUQ@mail.gmail.com>
Subject: Re: Rebuilding 24TB Raid5 array (was btrfs corruption: parent transid
 verify failed + open_ctree failed)
To:     Marc MERLIN <marc@merlins.org>
Cc:     linux-btrfs <linux-btrfs@vger.kernel.org>
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On Tue, May 31, 2022 at 9:29 PM Marc MERLIN <marc@merlins.org> wrote:
>
> On Tue, May 31, 2022 at 09:26:03PM -0400, Josef Bacik wrote:
> > On Tue, May 31, 2022 at 8:25 PM Marc MERLIN <marc@merlins.org> wrote:
> > >
> > > On Tue, May 31, 2022 at 08:14:27PM -0400, Josef Bacik wrote:
> > > > Wtf, we're clearly writing the chunk root properly because I have to
> > > > re-open it to recover the tree root, and that's where it fails, but
> > > > then the chunk restore can't open the root, despite it being correctly
> > > > read in the tree recover.  I've pushed new code, try tree-recover and
> > > > then recover-chunks again and capture the output please.  Thanks,
> > >
> > > gargamel:/var/local/src/btrfs-progs-josefbacik# ./btrfs rescue recover-chunks /dev/mapper/dshelf1
> > > checksum verify failed on 21135360 wanted 0x00000000 found 0x3533f3b5
> > > checksum verify failed on 21135360 wanted 0x00000000 found 0x3533f3b5
> > > checksum verify failed on 21135360 wanted 0x00000000 found 0x3533f3b5
> >
> > Ah ok, I wasn't actually updating the pointer, fixed that, lets try
> > the same sequence again.  Thanks,
>

Ok backup roots don't work if we didn't read them, try again please.  Thanks,

Josef