On Jan 12, 2016 15:03, "Josh Boyer" <jwboyer@fedoraproject.org> wrote:
>
> On Tue, Jan 12, 2016 at 2:08 PM, Mattia Verga <mattia.verga@tiscali.it> wrote:
> > Il 07/01/2016 20:30, Tomasz Torcz ha scritto:
> >>
> >> On Thu, Jan 07, 2016 at 01:33:22PM -0500, Josh Boyer wrote:
> >>>
> >>> Hello,
> >>>
> >>> The 4.3.3 kernel has been pushed to updates-testing for F23.  As of
> >>> right now, it has a +12 karma score.  Given that it is a major release
> >>> rebase, we're going to wait at least a few days to see how it fares.
> >>>
> >>> If you are so inclined, testing would be appreciated.  As usual,
> >>> please give karma as appropriate but we would appreciate it if you
> >>> only give negative karma for new, not reported issues and with a bug
> >>> link associated.  If a bug is fixed, we have marked it as such.  If it
> >>> isn't, we haven't and giving negative karma for those known issues
> >>> simply prevents fixes from getting into the hands of other users.
> >>>
> >>   Please note there seem to be a btrfs regression in since 4.3:
> >> namely fstrim could discard beginning of the disk, removing the
> >> bootloader.  This commit fixes the issue:
> >>
> >>
> >> http://git.kernel.org/cgit/linux/kernel/git/fdmanana/linux.git/commit/?h=integration-4.5&id=7b6cb6618b45bb383f9336ec89df5f1f31f9935b
> >>
> > So, is it safe to install kernel 4.3.3-300? I see it's now in stable repo,
> > but I think it doesn't carry the commit above...
>
> The commit above isn't in any released kernel, Fedora or upstream or
> otherwise.  It was only added to the main btrfs maintainer's tree
> about a day ago.
>
> As far as I understand the bug, it only happens if you have the
> bootloader installed in the root partition (not a separate /boot) and
> you run an fstrim on the whole partition (fstrim /) either manually or
> from a system script or such.  I suppose it would possibly happen if
> you have the bootloader installed in a btrfs /boot partition and ran
> fstrim on that too.  However, Fedora doesn't support booting from a
> btrfs filesystem at the moment and typical installs create a separate
> /boot partition that is ext4.  I may have some details wrong and would
> gladly be corrected if so.

Can confirm. Just head to reinstall an F23 system. Automatically generated partitions (Encrypted btrfs raid0) gave me an ext4 /boot

> We'll pick up the fix once it lands in Linus' tree.  Until then, the
> safety is mostly determine by that of btrfs in general.  Opinions
> vary.
>
> josh
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