On Wed, Nov 20, 2019 at 11:32:55AM -0800, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > An internal customer followed an erroneous AskUbuntu article[1] to try to > change the UUID of a live ext4 filesystem. The article claims that you > can work around tune2fs' "cannot change UUID on live fs" error by > disabling uninit_bg, changing the UUID, and re-enabling the feature. > > This led to metadata corruption because tune2fs' journal descriptor > rewrite races with regular filesystem writes. Therefore, prevent > administrators from turning on or off uninit_bg on a mounted fs. > > [1] https://askubuntu.com/questions/132079/how-do-i-change-uuid-of-a-disk-to-whatever-i-want/195839#459097 > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Thanks, applied. - Ted
