lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Fri, 15 Mar 2024 00:41:09 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: linux-bcachefs@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: bcachefs: do not run 6.7: upgrade to 6.8 immediately if you have a
 multi device fs

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

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ