Mailinglist Archive: opensuse-factory (930 mails)

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Re: [opensuse-factory] BTRFS default options in Leap 42.3 (was: Rolling to Leap 42.3)
Hi Ronan,

On Wed 08-03-17 15:22:53, ronisbr@xxxxxxxxx wrote:
Hi guys!

I want to start a discussion about BTRFS in Leap 42.3. As I stated in
some old e-mails I sent to this ML, we have a critical bug that is
affecting Tumbleweed and Leap 42.3 users on different kinds of machines
(workstations, laptops, desktops, etc.) [1].

The systems becomes basically frozen when btrfs-maintenance script is
executed. The cause is some problem with quotas.

Specifically it is O(n^3) quota group accounting algorithm in Btrfs code where
`n' is the number of extent links. Given enough snapshots the system grinds to
halt.

Indeed, the only workaround we know as of now is to completely disable quotas
(or the btrfs-maintenance script, which is not good).

This is not an openSUSE bug, since a Gentoo user already reported it.

Correct. The same bug is in upstream kernel too.

Hence, should we start a discussion about if we really want to ship
Leap 42.3 with quotas enabled by default?

We have reports also for the SUSE Linux Enterprise distro about this bug so
it's surely going to be fixed. However, I have no ETA yet.

Libor

Best regards,
Ronan Arraes Jardim Chagas

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[1] https://bugzilla.opensuse.org/show_bug.cgi?id=1017461
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Libor Pechacek
SUSE Labs
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