Messages in this thread |  | | Date | Fri, 15 Mar 2024 00:41:09 -0400 | | From | Kent Overstreet <> | | Subject | bcachefs: do not run 6.7: upgrade to 6.8 immediately if you have a multi device fs |
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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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