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Date:   Tue, 31 May 2022 15:49:51 -0700
From:   Marc MERLIN <marc@merlins.org>
To:     Josef Bacik <josef@toxicpanda.com>
Cc:     linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Rebuilding 24TB Raid5 array (was btrfs corruption: parent
 transid verify failed + open_ctree failed)
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On Tue, May 31, 2022 at 04:57:17PM -0400, Josef Bacik wrote:
> I hate myself so much.  It looks like it recovered the chunk tree, so
> you should be able to run
> 
> btrfs rescue recover-chunks <device>
> 
> to see if it can find the mapping's we're missing.  If it does then
> I'll wire up the code to insert them, and then we can go about finding
> the other roots and getting this thing fixed.  Thanks,

gargamel:/var/local/src/btrfs-progs-josefbacik# git pull
Already up-to-date.

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
Csum didn't match
ERROR: cannot read chunk root
WTF???
ERROR: open ctree failed, try btrfs rescue tree-recover
Recover chunks tree failed

gargamel:/var/local/src/btrfs-progs-josefbacik# ./btrfs rescue tree-recover /dev/mapper/dshelf1
WARNING: cannot read chunk root, continue anyway
none of our backups was sufficient, scanning for a root
scanning, best has 0 found 1 bad
ret is 0 offset 20971520 len 8388608
ret is -2 offset 20971520 len 8388608
checking block 22495232 generation 1572124 fs info generation 2582703
trying bytenr 22495232 got 1 blocks 0 bad
checking block 22462464 generation 1479229 fs info generation 2582703
trying bytenr 22462464 got 1 blocks 0 bad
checking block 22528000 generation 1572115 fs info generation 2582703
trying bytenr 22528000 got 1 blocks 0 bad
checking block 22446080 generation 1571791 fs info generation 2582703
trying bytenr 22446080 got 1 blocks 0 bad
checking block 22544384 generation 1556078 fs info generation 2582703
trying bytenr 22544384 got 1 blocks 0 bad
checking block 22511616 generation 1555799 fs info generation 2582703
trying bytenr 22511616 got 1 blocks 0 bad
checking block 22577152 generation 1586277 fs info generation 2582703
trying bytenr 22577152 got 1 blocks 0 bad
checking block 22478848 generation 1561557 fs info generation 2582703
trying bytenr 22478848 got 1 blocks 0 bad
checking block 22593536 generation 1590219 fs info generation 2582703
trying bytenr 22593536 got 1 blocks 0 bad
checking block 22609920 generation 1551635 fs info generation 2582703
trying bytenr 22609920 got 1 blocks 0 bad
checking block 22560768 generation 1590217 fs info generation 2582703
trying bytenr 22560768 got 1 blocks 0 bad
No mapping for 15645202989056-15645203005440
Couldn't map the block 15645202989056
Couldn't map the block 15645202989056
No mapping for 15645202907136-15645202923520
Couldn't map the block 15645202907136
Couldn't map the block 15645202907136
No mapping for 15645202989056-15645203005440
Couldn't map the block 15645202989056
Couldn't map the block 15645202989056
No mapping for 15645202989056-15645203005440
Couldn't map the block 15645202989056
Couldn't map the block 15645202989056
No mapping for 15645202907136-15645202923520
Couldn't map the block 15645202907136
Couldn't map the block 15645202907136
none of our backups was sufficient, scanning for a root
scanning, best has 0 found 1 bad
ERROR: Couldn't find a valid root block for 1, we're going to clear it and hope for the best
Tree recover failed

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