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List: linux-kernel
Subject: bcachefs: do not run 6.7: upgrade to 6.8 immediately if you have a multi device fs
From: Kent Overstreet <kent.overstreet () linux ! dev>
Date: 2024-03-15 4:41:09
Message-ID: muwlfryvafsskt2l2hgv3szwzjfn7cswmmnoka6zlpz2bxj6lh () ugceww4kv3jr
[Download RAW message or body]
there's a bug in 6.7 with filesystems that are mid upgrade and then get
downgraded not getting marked in the superblock as downgraded, and this
translates to a really horrific bug in splitbrain detection when the old
version isn't updating member sequence nmubers and you go back to the
new version - this results in every device being kicked out of the fs.
and our backports are not being picked up by the stable team, so - do
not run 6.7, switch to 6.8 immediately, running 6.7 with new -tools will
trigger it.
if you are affected:
- 6.9 (once Linus merges) will have a new no_splitbrain_check option,
which runs the splitbrain checks in dry mode and won't kick your
devices out
- we have new repair code landing soon that can recover from
missing/unreadable btree roots by scanning the entire device(s) for
btree nodes (which, fortunately, we have sufficient metadata in btree
node headers to do safely; reiserfs famously did not). i've seen some
crazy corruption resulting from this, but it might still be
recoverable
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