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btrfs-cleaner frequently stuck at 100% CPU after 6.4.0 upgrade
Since I upgraded my RN102 to 6.4.0 last night I frequently have trouble reaching the admin interface, and my laptop has reported not being able to reach Time Machine. When I login by ssh and use ...
It seems like I found a way to get rid of the hanging btrfs-cleaner: After switching off quota
btrfs quota disable /data
btrfs-cleaner did never show up again (in top).
(After booting I usualy had about a minute to issue the command before btrfs-cleaner did spawn and prevented the command to respond.)
I did not intentionally enable quota - i guess it was enabled by default.
Good luck,
HansW
PS: Maybe the problem is known by Netgear - in their "FAQs on recently released firmware 6.4.0" (see link on top of page) they talk about "... this is likely due to the ReadyNAS performing a quota check".
Some websites also describe problems with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).
I did not extensive testing after diabling quota that way - I'm happy that I can acces my files again ...
It seems like I found a way to get rid of the hanging btrfs-cleaner: After switching off quota
btrfs quota disable /data
btrfs-cleaner did never show up again (in top).
(After booting I usualy had about a minute to issue the command before btrfs-cleaner did spawn and prevented the command to respond.)
I did not intentionally enable quota - i guess it was enabled by default.
Good luck,
HansW
PS: Maybe the problem is known by Netgear - in their "FAQs on recently released firmware 6.4.0" (see link on top of page) they talk about "... this is likely due to the ReadyNAS performing a quota check".
Some websites also describe problems with quota and btrfs (Rockstor forum), other sites cite the quota support in btrfs as experimental (but these might be out of date).
I did not extensive testing after diabling quota that way - I'm happy that I can acces my files again ...
HansWeihnacht wrote:It seems like I found a way to get rid of the hanging btrfs-cleaner: After switching off quota
btrfs quota disable /databtrfs-cleaner did never show up again (in top).
Hi Hans,
like you, I haven't enabled quota myself and they're not used in any of my shares.
I would've tried the "quota disable" command if it had been obvious whether it destroys all of the qgroups on the volume (visible using "qgroup show /data"). Is this documented anywhere for btrfs?
It's also not clear how to re-enable quota if it requires re-creating all the qgroups as described on the wiki. Is it documented anywhere how ReadyNAS OS requires qgroups to be set up?
In the end, by the time I got access to my NAS 6.4.1-T21 beta was out, so I installed it and haven't had problems since (after 10h of uptime, btrfs-cleaner is still below 7s of CPU time). So I'll consider this fixed if the beta ever turns into a release.
Cheers,
joki
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